JP4592616B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle device including a refrigerant circuit including a compressor, a radiator, a decompression device, and an evaporator. Specifically, the refrigeration cycle device exhibits a heating action by heat radiation from the radiator and is cooled by heat absorption by the evaporator. The present invention relates to a refrigeration cycle apparatus that exhibits its action.

  Conventionally, a refrigeration cycle apparatus using a vapor compression refrigeration cycle has been widely used as a method for cooling an object to be cooled, such as cooling and refrigeration. In this type of refrigeration cycle apparatus, the object to be cooled is cooled by the heat absorption of the refrigerant in the evaporator to cool the object to be cooled, and the heat generated by the heat radiation of the refrigerant in the radiator is radiated to the atmosphere or the like.

  In recent years, in this kind of refrigeration cycle apparatus, an attempt has been made to effectively use energy by utilizing heat that has not been used by being released to the atmosphere with a conventional radiator. As an example, for example, a radiator Devices that use the heat released from the hot water supply have also been developed.

As described above, the heat that has been exhausted to the atmosphere in the past can be used for hot water supply, so that the energy can be effectively used. Further, when heat is discharged to the atmosphere in a conventional radiator, there is a disadvantage that the discharge of the heat causes an increase in the temperature around the refrigeration cycle apparatus. However, as described above, the heat of the radiator is heated. It has become possible to eliminate such an inconvenience by using it (see, for example, Patent Document 1).
JP 2005-106360 A

  However, when the heat generated in the evaporator is used for heating in the radiator as described above, the amount of heat released from the refrigerant in the radiator is insufficient or decreased due to an increase in cooling load or a decrease in heating load. As a result, there has been a problem that the cooling capacity of the evaporator is reduced and the cooling of the object to be cooled is hindered.

  The present invention has been made to solve the problems of the related art, and in a refrigeration cycle apparatus that uses heat generated by heat absorption in an evaporator for heating in a radiator, the heat dissipation in the radiator is insufficient. Alternatively, it is an object of the present invention to reliably avoid the disadvantage that the cooling capacity of the evaporator decreases due to the decrease and maintain the cooling action.

Therefore, the refrigeration cycle apparatus according to claim 1 includes a refrigerant circuit including a compressor, a radiator, a decompression device, and an evaporator, and a hot water storage tank, and exchanges heat between the water in the hot water storage tank and the radiator. Thus, hot water is generated by heat radiation from the radiator, stored in the hot water storage tank, and exhibits a cooling action by absorbing heat from the evaporator, and a water supply device for supplying water into the hot water storage tank; A discharge device that discharges water in the hot water storage tank and a high temperature hot water outlet provided at the top of the hot water storage tank, and a discharge pipe of the discharge device is disposed in the hot water storage tank below the high temperature hot water outlet, The temperature of the water in the hot water storage tank, or the water circulated through the heat exchanger for exchanging heat between the heat radiator and the water in the hot water storage tank, or the temperature of the refrigerant in the heat radiator or from the heat radiator Rose above a certain value If, characterized by discharging the water in the hot water storage tank by the discharge device.

The refrigeration cycle apparatus according to claim 2 is characterized in that, in the above invention, the hot water storage tank is provided with a low temperature hot water outlet in the lower part, and the discharge pipe of the discharge device is disposed in the hot water storage tank above the low temperature hot water outlet. And

According to the first aspect of the present invention, a refrigerant circuit including a compressor, a radiator, a pressure reducing device, and an evaporator, and a hot water storage tank are provided, and the water in the hot water storage tank and the radiator are subjected to heat exchange, thereby In a refrigeration cycle apparatus that generates hot water by heat radiation from a radiator and stores it in a hot water storage tank, and exhibits a cooling action by absorbing heat by an evaporator, a water supply device that supplies water into the hot water storage tank, A discharge device for discharging water and a high temperature hot water outlet provided in the upper part of the hot water storage tank are provided, and a discharge pipe of the discharge device is disposed in the hot water storage tank below the high temperature hot water outlet and is disposed in the hot water storage tank. Water or the temperature of water circulated through a heat exchanger for exchanging heat between the radiator and the water in the hot water storage tank, or the temperature of the refrigerant in the radiator or exiting the radiator is a predetermined value. If it rises above, Since the water in the hot water storage tank is discharged by the device, water lower in temperature than the water discharged from the water supply device into the hot water storage tank can be supplied by the amount of water discharged by the discharge device. The temperature of the water to be exchanged can be lowered.

  Thereby, since the heat radiation amount of the refrigerant in the radiator can be ensured, the cooling capacity in the evaporator can be maintained.

In particular, since the discharge pipe of the discharge device is arranged in a hot water storage tank below the high temperature hot water outlet, water (hot water) lower in temperature than the water (hot water) extracted from the high temperature hot water outlet can be taken out from the discharge device. It becomes possible. Thereby, the water in the hot water storage tank can be discharged from the discharge device without hindering the use of the high-temperature water (hot water) stored in the hot water storage tank.

According to the invention of claim 2, in addition to the above, the hot water storage tank includes a low temperature hot water outlet in the lower part, and the discharge pipe of the discharge device is disposed in the hot water storage tank above the low temperature hot water outlet. The hot water in the hot water storage tank taken out from the discharge device is an intermediate hot water that is lower in temperature than hot water taken out from the high temperature hot water outlet and hotter than water taken out from the low temperature hot water outlet. Therefore, it is possible to discharge hot water from the hot water storage tank by the discharge device.

  In general, the heat in the hot water storage tank is discharged from the discharge device while minimizing the heat loss and without hindering the use of hot water (hot water) stored in the hot water storage tank. The temperature of the water to be heat exchange can be lowered.

  Hereinafter, embodiments of the refrigeration cycle apparatus of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a refrigeration cycle apparatus according to an embodiment to which the present invention is applied. The refrigeration cycle apparatus 1 of the present embodiment includes a compressor 10, a radiator 11, a refrigerant circuit 2 including an expansion valve 14 and an evaporator 16 as a decompression device, and a hot water supply circuit 3 including a hot water storage tank 30, and a radiator. In addition to exhibiting a heating action by heat radiation from the heat sink 11, a cooling action is exhibited by heat absorption by the evaporator 16. That is, the refrigeration cycle apparatus 1 generates high-temperature hot water by heat dissipation from the radiator 11 by exchanging heat between the water in the hot water storage tank 30 circulating in the hot water supply circuit 3 or hot water and the radiator 11. In addition to being stored in the hot water storage tank 30, the object to be cooled is cooled by exhibiting a cooling action by absorbing heat from the evaporator 16.

  The refrigerant circuit 2 is configured to form a closed circuit by sequentially connecting the compressor 10, the radiator 11, the expansion valve 14 as the throttle means, and the evaporator 16 in an annular manner. Specifically, the high-pressure refrigerant pipe 40 connected to the discharge side of the compressor 10 is connected to the inlet of the radiator 11. The radiator 11 is a refrigerant passage that constitutes a part of the heat exchanger 13, and is disposed so as to be able to exchange heat with the water passage 12 of the hot water supply circuit 3. The heat exchanger 13 is a water-refrigerant heat exchange type heat exchanger that exchanges heat between the radiator 11 and the water in the hot water storage tank 30 of the hot water supply circuit 3. It consists of a water passage 12. One end of the heat exchanger 13 is formed with an inlet of the refrigerant passage of the radiator 11 and an outlet of the water passage 12, and the other end is provided with an outlet of the refrigerant passage of the radiator 11 and an inlet of the water passage 12. Each is formed. Therefore, in the heat exchanger 13, the high-temperature and high-pressure refrigerant discharged from the compressor 10 and flowing through the radiator 11 and the water flowing through the water passage 12 are opposed to each other.

  On the other hand, the refrigerant pipe 41 connected to the outlet of the radiator 11 is connected to the inlet of the expansion valve 14. The expansion valve 14 is a decompression device for decompressing the refrigerant radiated by the radiator 11, and the refrigerant pipe 42 connected to the outlet of the expansion valve 14 is connected to the inlet of the evaporator 16. One end of the suction pipe 45 is connected to the outlet of the evaporator 16, and the other end of the suction pipe 45 is connected to the low pressure side (suction part) of the compressor 10. The suction pipe 45 connecting the evaporator 16 and the low pressure side of the compressor is provided with an accumulator 17 for protecting the compressor from the disadvantage that liquid refrigerant is sucked into the compressor 10 and is damaged. ing.

  A discharge temperature sensor T <b> 1 for detecting the temperature of the high-temperature and high-pressure refrigerant discharged from the compressor 10 is installed in the high-pressure refrigerant pipe 40 of the refrigerant circuit 2. The discharge temperature sensor T1 is connected to a control device described later.

  In addition, carbon dioxide, which is a natural refrigerant, is enclosed in the refrigerant circuit 2 described above as a refrigerant. Since the pressure on the high pressure side of the refrigerant circuit 2 rises above the critical pressure, the refrigerant cycle becomes a transcritical cycle. Further, as the lubricating oil of the compressor 10, for example, mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylene glycol), POE (polyol ether) and the like are used.

  On the other hand, the hot water supply circuit 3 heats water by receiving heat from the refrigerant flowing through the radiator 11 of the refrigerant circuit 2 described above, generates hot hot water, and stores the hot water in the hot water storage tank 30. A hot water supply device 32 for supplying water into the hot water storage tank 30, a hot water supply device 34 for supplying hot water stored in the hot water storage tank 30 to a hot water supply load facility, and a discharge device 36 described later.

  The hot water storage circuit 5 is configured by pipe-connecting a hot water storage tank 30, a circulation pump 31, a flow rate adjusting valve 35, and the water passage 12 of the heat exchanger 13 in order. That is, the low temperature pipe 47 connected to the lower part of the hot water storage tank 30 is connected to the inlet of the water passage 12 formed at the other end of the heat exchanger 13 through the circulation pump 31 and the flow rate adjusting valve 35. The low-temperature pipe 47 takes out the low temperature hot water (water) stored in the hot water storage tank 30 from below the hot water storage tank 30 and flows it to the heat exchanger 13, so that the lower part of the hot water storage tank 30 and the heat exchanger 13 This pipe connects the inlet of the water passage 12. The circulation pump 31 is for circulating water in the hot water storage circuit 5. The circulation pump 31 of this embodiment discharges water taken out from the lower part of the hot water storage tank 30 to the heat exchanger 13 side, and the water flow in the water passage 12 of the heat exchanger 13 is in the radiator 11 as described above. Water in the hot water storage circuit 5 is circulated so as to be opposed to the refrigerant flow (in FIG. 1, water is circulated clockwise). The flow rate adjustment valve 35 is a valve device for adjusting the flow rate of the hot water in the hot water storage circuit 5 circulated by the circulation pump 31, and the opening and closing and the opening degree of the valve are controlled by the control device.

  On the other hand, one end of a high-temperature pipe 48 is connected to the outlet of the water passage 12 formed at one end of the heat exchanger 13, and the other end of the high-temperature pipe 48 is connected to the upper part of the hot water supply tank 30 (the upper end in this embodiment). It is connected. A hot water temperature sensor T <b> 2 for detecting the temperature of hot water that is generated by heat dissipation from the radiator 11 in the heat exchanger 13 and enters the hot water storage tank 30 is provided in the middle of the high-temperature pipe 48. . A temperature sensor T6 for detecting the temperature of the water circulated through the heat exchanger 13 is installed in the middle of the low temperature pipe 47. The hot water temperature sensor T2 and the temperature sensor T6 are each connected to a control device.

  On the other hand, the hot water storage tank 30 is a tank for storing hot hot water generated by heat dissipation from the radiator 11 in the heat exchanger 13, and the entire outer peripheral surface is covered with a heat insulating material and stored inside. The structure is such that the hot water that is produced is difficult to cool.

  The hot pipe 48 is connected to the upper portion of the hot water storage tank 30 and a high temperature hot water outlet 37 for taking out hot hot water from the hot water storage tank 30 is provided. The high temperature hot water outlet 37 is connected to a high temperature hot water outlet pipe 34 </ b> A of the hot water supply device 34. In addition, the low temperature pipe 47 is connected to the lower part of the hot water storage tank 30 and a low temperature hot water outlet 38 for taking out low temperature hot water from the hot water storage tank 30 is provided. The low temperature hot water outlet 38 is connected to a low temperature hot water discharge pipe 34B of the hot water supply device 34.

  The hot water supply device 34 mixes the hot water in the hot water storage tank 30 taken out from the high temperature hot water extraction pipe 34A with the low temperature hot water taken out from the low temperature hot water extraction pipe 34B as necessary, and adjusts it to an optimum temperature. It is supplied to the hot water supply load facility. Hot water is supplied to the hot water supply load facility by opening a hot water supply valve (not shown). The hot water supply valve is, for example, a faucet for hot water supply, and is not limited to one, and a plurality of hot water supply valves may be provided.

  Further, a water supply pipe 32A of the water supply device 32 is connected to the lower part of the hot water storage tank 30 via a pressure reducing valve 32B. The water supply device 32 supplies water into the hot water storage tank 30, and water corresponding to the amount of hot water used in the hot water supply tank 30, for example, city water, enters the hot water storage tank 30 from the water supply pipe 32 </ b> A. It is supplied from the lower part of 30. The water supply pipe 32A is provided with a water supply valve (not shown), and the water supply valve is normally kept open.

  Furthermore, a discharge valve and a discharge pipe for discharging hot water in the hot water storage tank 30 when the hot water storage tank 30 is not used are connected to the lower part of the hot water storage tank 30 (not shown).

  Here, the discharge device 36 described above is for discharging water (hot water) in the hot water storage tank 30, and is disposed below the high temperature hot water outlet 37 and above the low temperature hot water outlet 38. Yes. In this embodiment, a hot water discharge pipe 36A of the discharge device 36 is connected via a hot water discharge valve 36B below the high temperature hot water outlet 37 of the hot water storage tank 30 and above the low temperature hot water outlet 38. In this way, by disposing the discharge device 36 below the high temperature hot water outlet 37 and above the low temperature hot water outlet 38, the hot water in the hot water storage tank 30 taken out from the discharge device 36 can be removed from the high temperature hot water outlet 38. The hot water is at a lower temperature than the hot water taken out from the outlet 37 and is hotter than the hot water taken out from the low temperature hot water outlet 38. Therefore, by opening the hot water discharge valve 36 </ b> B, it becomes possible to discharge the medium temperature hot water from the hot water storage tank 30.

  On the other hand, a plurality of hot water storage sensors T4 are arranged on the outer surface of the hot water storage tank 30 at appropriate intervals from the upper part to the lower part. The hot water storage sensor T4 is a sensor for detecting the temperature of each part of hot water stored in the hot water storage tank 30 and the presence or absence of hot water. In this manner, a plurality of hot water storage sensors T4 are installed at different heights, and the temperature of each part is detected, so that the temperature distribution from the upper part to the lower part of the hot water storage tank 30 is grasped and stored in the hot water storage tank 30. It is possible to detect the amount of hot water. Each hot water storage sensor T4 is connected to the control device.

  And the control apparatus mentioned above is a control means which manages control of the refrigerating-cycle apparatus 1 of this invention, operation | movement of the compressor 10 and the circulation pump 31, each valve apparatus (expansion valve 14, the flow regulating valve 35, the hot water discharge valve) 36B) is controlled for opening / closing and opening. Further, the sensors T1, T2, T4, and T6 are connected to the control device, and the temperature of the object to be cooled by the evaporator 16 or the space in which the object to be cooled is stored or the outside air temperature. A temperature sensor (not shown) for detection is also connected, and the control device controls the operation of the refrigeration cycle apparatus 1 based on these input information.

  It should be noted that the capacity of the hot water storage tank 30 is based on sufficient consideration of the cooling load of the object to be cooled by the evaporator 16 of the refrigerant circuit 2, the required hot water supply load, the time at which each load is generated, and the like. It is necessary to decide on. That is, when the hot water is taken out from the lower part of the hot water storage tank 30 and flows into the water passage 12 of the heat exchanger 13 during the cooling operation, the heat dissipation amount in the radiator 11 is significantly reduced. The cooling capacity and COP of the refrigerant circuit 2 are also deteriorated. Therefore, the capacity of the hot water storage tank 30 should be a hot water storage tank with a sufficient volume that allows low temperature water to be always taken out from the lower part of the hot water storage tank 30 and flowed to the water passage 12 of the heat exchanger 13. It is preferable to appropriately examine the specific capacity according to the intended use and conditions.

  In the present invention, the water described above refers to all the temperature zones flowing through the hot water supply circuit 3 including not only cold water supplied from the water supply device 32 into the hot water storage tank 30 but also hot water stored in the hot water storage tank 30. It is a general term for water. Therefore, in the present invention, hot water is also understood as a part of water.

  With the above configuration, the operation of the refrigeration cycle apparatus 1 of the present embodiment will be described.

(1) Operation of Refrigerant Circuit During Cooling Operation First, the operation of the refrigerant circuit 2 during the cooling operation will be described. The control device starts the compressor 10 of the refrigerant circuit 2 in accordance with the required cooling load based on each input information (information input by each of the sensors and the like). When the compressor 10 is driven by the control device, the low-temperature and low-pressure refrigerant gas is sucked into the low-pressure side (suction part) of the compressor 10 from the suction pipe 45 and compressed. As a result, the refrigerant gas that has reached high temperature and pressure enters the high-pressure refrigerant pipe 40 from the discharge side and is discharged to the outside of the compressor 10. At this time, the refrigerant is compressed to an appropriate supercritical pressure.

  The high-temperature and high-pressure refrigerant discharged from the compressor 10 enters the heat exchanger 13 from the inlet of the radiator 11 through the high-pressure refrigerant pipe 40. The high-temperature and high-pressure refrigerant gas releases heat to the water in the hot water storage circuit 5 flowing through the water passage 12 provided in heat exchange with the radiator 11 in the process of passing through the radiator 11 of the heat exchanger 13. It is cooled and becomes low temperature. On the other hand, the heat in the radiator 11 heats the water in the water passage 12 to generate hot water.

  At this time, in the radiator 11, the state of the refrigerant is usually a liquid phase that is equal to or higher than the critical pressure. That is, since carbon dioxide is used as the refrigerant in this embodiment, the refrigerant pressure in the radiator 11 is equal to or higher than the critical pressure, and the refrigerant does not condense in the radiator 11. The temperature of the refrigerant gradually decreases as the heat is released to the water in the water passage 12. On the other hand, in the water passage 12 of the heat exchanger 13, the temperature of water gradually increases from the inlet toward the outlet as heat is absorbed from the refrigerant. In this way, by using the carbon dioxide refrigerant, the refrigerant pressure in the radiator 11 is set to be equal to or higher than the critical pressure, so that it is compared with the condensation heat radiation under a constant temperature like a conventional refrigerant, for example, an HFC refrigerant. Thus, highly efficient heat exchange is possible, and high-temperature hot water can be generated. Further, in the heat exchanger 13, since the refrigerant passage and the water passage 12 constituting the radiator 11 are installed so as to face each other as described above, heat is more efficiently exchanged between the water and the refrigerant. be able to.

  The low-temperature and high-pressure refrigerant cooled by the radiator 11 exits the heat exchanger 13 from the outlet of the radiator 11, passes through the refrigerant pipe 41, expands at the expansion valve 14, becomes low pressure, and passes through the refrigerant pipe 42. To the evaporator 16. The state of the refrigerant at the inlet of the evaporator 16 is a two-phase mixed state in which liquid refrigerant and vapor refrigerant are mixed. And in the said evaporator 16, when a liquid phase refrigerant | coolant absorbs heat from a to-be-cooled object, it will evaporate and will become a vapor | steam refrigerant | coolant. At this time, the object to be cooled is cooled by the heat absorption. The above-described objects to be cooled include, for example, foods and beverages that require cooling and cold storage, air when air conditioning is performed, or water, brine, and ice in a system using heat transfer and heat storage. It is done.

  Then, the refrigerant evaporated in the evaporator 16 exits the evaporator 16 and enters the suction pipe 45, and repeats a cycle in which the refrigerant is sucked into the compressor 10 again from the low pressure side (suction part) through the accumulator 17. By repeating the above cycle, the object to be cooled is cooled by heat absorption by the evaporator 16, and at the same time, hot water is generated by heat radiation from the radiator 11.

  During the cooling operation, the opening degree of the expansion valve 14 is adjusted by the control device so that the temperature of the discharge refrigerant detected by the discharge temperature sensor T1 installed in the high-pressure refrigerant pipe 40 of the refrigerant circuit 2 becomes a predetermined temperature. The Specifically, when the refrigerant temperature detected by the discharge temperature sensor T1 rises above a predetermined value, the opening degree of the expansion valve 14 is expanded by the control device. Conversely, when the refrigerant temperature detected by the discharge temperature sensor T1 becomes lower than a predetermined value, the opening degree of the expansion valve 14 is reduced by the control device. Thereby, the highly efficient driving | running on the suitable conditions in the driving | operation which generate | occur | produces the hot water for hot water supply can be performed.

  In addition, the rotation speed of the compressor 10 during the cooling operation may be constant, or the frequency may be adjusted by an inverter or the like according to the cooling load.

(2) Operation of Hot Water Supply Circuit 3 During Cooling Operation Next, the operation of the hot water supply circuit 3 during the cooling operation will be described. When the above-described cooling operation is started, the circulating pump 31 of the hot water supply circuit 3 is activated by the control device described above, and low temperature hot water or water (hereinafter abbreviated as water) is cooled from the lower part of the hot water storage tank 30. It is sucked into the circulation pump 31 through the pipe 47 and pushed out to the low-temperature pipe 47 on the heat exchanger 13 side connected to the outlet of the circulation pump 31. Thereby, the water pushed out from the circulation pump 31 flows into the heat exchanger 13 from the inlet of the water passage 12 through the flow rate adjustment valve 35. In the heat exchanger 13, the water flowing in the water passage 12 is heated by receiving heat from the radiator 11 by heat exchange with the refrigerant flowing through the radiator 11 as described above, and high-temperature hot water is generated. The hot water that has exited the heat exchanger 13 from the outlet of the water passage 12 passes through the high-temperature pipe 48 of the hot water storage circuit 5 and is injected into the hot water storage tank 30 from the upper part (upper end) of the hot water storage tank 30. In the hot water storage tank 30, the hot water generated in the heat exchanger 13 is injected from the upper part and the water is taken out from the lower part. Water is stored at the bottom and low-temperature water is stored.

  The flow rate adjusting valve 35 adjusts the flow rate of water so that the temperature of hot water at the outlet of the water passage 12 of the heat exchanger 13 becomes a predetermined value. In this embodiment, the flow rate adjusting valve 35 is controlled by the control device based on the temperature of hot water at the outlet of the water passage 12 of the heat exchanger 13 detected by the hot water temperature sensor T2. That is, when the temperature of the hot water at the outlet of the water passage 12 detected by the hot water temperature sensor T2 is higher than a predetermined temperature, the opening degree of the flow rate adjustment valve 35 is expanded by the control device. Thereby, the circulation amount (flow rate) of the water circulating in the hot water storage circuit 5 can be increased.

  On the other hand, when the temperature of the hot water at the outlet of the water passage 12 detected by the hot water temperature sensor T2 is lower than a predetermined temperature, the opening degree of the flow rate adjusting valve 35 is reduced by the control device. Thereby, the circulation amount (flow rate) of the water circulating in the hot water storage circuit 5 can be reduced. In the present embodiment, the temperature of the hot water at the outlet of the water passage 12 is detected by the hot water temperature sensor T2 installed in the middle of the high temperature pipe 48. However, the present invention is not limited to this, and the water passage of the heat exchanger 13 is used. Of course, the temperature sensor may be installed at the outlet 12 to detect the temperature. The predetermined temperature is preferably determined according to the intended use within a range of about 50 ° C. to 85 ° C., specifically a temperature suitable for hot water use.

  Note that the flow rate of water may be adjusted using, for example, an inverter type circulation pump without using the flow rate adjusting valve 35. In this case, when the temperature of hot water at the outlet of the water passage 12 is higher than a predetermined temperature, the amount of water circulating in the hot water storage circuit 5 is increased by controlling the rotational speed of the inverter circulation pump to be high by the control device. Can be made. Conversely, when the temperature of the hot water at the outlet of the water passage 12 is lower than the predetermined temperature, the control device controls the rotation speed of the inverter circulation pump to be low, thereby reducing the amount of water circulating in the hot water storage circuit 5. Can be made.

  The hot water generated by the heat exchanger 13 and stored in the hot water storage tank 30 is supplied to a hot water supply load facility by operating a hot water supply valve (not shown) such as the faucet. Specifically, when the hot water supply valve is opened, high temperature hot water stored in the hot water storage tank 30 is changed from a high temperature hot water outlet 37 formed in the upper part of the hot water storage tank 30 to a mixing valve (not shown) via the high temperature hot water outlet pipe 34A. Flowing. Similarly, the low temperature hot water stored in the hot water storage tank 30 flows from the low temperature hot water outlet 38 formed in the lower part of the hot water storage tank 30 to the mixing valve via the low temperature hot water extraction pipe 34B. Then, hot water and low temperature hot water (or water) are mixed by the mixing valve, adjusted to a predetermined temperature, and then supplied to each load facility via the hot water supply valve.

  Note that the temperature of hot water supplied to each load facility described above is detected by a hot water supply temperature sensor (not shown) provided on a pipe connecting the mixing valve and the hot water supply valve. In addition, since the water supply valve of the water supply device 32 is normally open, an amount of city water corresponding to the amount of hot water supplied to each load facility is supplied from the water supply pipe 32A of the water supply device 32 to the hot water supply circuit. 3 is supplied into the system.

  As described above, the refrigeration cycle apparatus 1 exhibits a cooling action by absorbing heat from the evaporator 16 to cool the object to be cooled, and effectively uses the heat generated in the cooling process, that is, from the radiator 14. It is possible to generate hot water by heat dissipation and supply the generated hot water to the hot water supply load facility. In particular, by using a transcritical cycle using a carbon dioxide refrigerant as in this embodiment, the temperature of the hot water generated by the radiator 11 can be increased. Therefore, energy consumption can be greatly reduced as compared with a hot water supply apparatus that boils and supplies hot water with a conventional boiler or the like. In addition, by using the heat on the high temperature side of the refrigeration cycle apparatus, the heat that has been released to the atmosphere from the high pressure side can be reduced, so that the increase in the ambient temperature of the refrigeration cycle apparatus can also be suppressed. Become.

(3) Operation to ensure the heat radiation amount of the radiator 11 during the cooling operation By the way, in such a refrigeration cycle apparatus, it is stored in the hot water storage tank 30 due to an increase in cooling load or a decrease in hot water supply load during the cooling operation. If the amount of hot water to be produced becomes excessive, the temperature of the hot water taken out from the lower part of the hot water storage tank 30 also rises. As a result, there arises a problem that the hot water flows into the heat exchanger 13.

  When high-temperature hot water flows into the heat exchanger 13 in this way, in the radiator 11 of the heat exchanger 13, the refrigerant flowing through the radiator 11 releases heat to the water flowing through the water passage 12. It will be significantly reduced or insufficient. As a result, since the refrigerant cannot be cooled to a low temperature in the radiator 11, the specific enthalpy of the refrigerant flowing in the evaporator 16 is also increased, and the cooling capacity in the evaporator 16 and the efficiency of the refrigeration cycle apparatus 1 are significantly reduced. There arises a problem that hinders cooling of the object to be cooled in the evaporator 16.

  In order to solve such a problem, the present invention secures a predetermined heat dissipation amount in the radiator 11 necessary for maintaining the cooling action in the evaporator 16 based on an index that can grasp the heat dissipation amount in the radiator 11. The operation shall be executed. Specifically, the refrigeration cycle apparatus 1 of the present embodiment is configured so that water in the hot water storage tank 30 or water circulated to the heat exchanger 13 for heat exchange between the radiator 11 and the water in the hot water storage tank 30 is used. When the temperature or the temperature of the refrigerant in the radiator 11 or the refrigerant discharged from the radiator 11 rises to a predetermined value or more, the water in the hot water storage tank 30 is discharged by the discharge device 36.

  Here, the water discharge operation of the hot water storage tank 30 by the discharge device 36 will be described. In the refrigeration cycle apparatus 1 of the present embodiment, the temperature of water circulated through the heat exchanger 13 for exchanging heat between the radiator 11 detected by the temperature sensor T6 and the water in the hot water storage tank 30 is equal to or higher than a predetermined value. For example, when the temperature rises to 25 ° C. to 30 ° C. or higher, the water in the hot water storage tank 30 is discharged by the discharge device 36. The temperature at which the water in the hot water storage tank 30 is discharged by the discharge device 36 is the water circulated in the heat exchanger 13 for exchanging heat between the radiator 11 and the water in the hot water storage tank 30 as in this embodiment. Not only the temperature but also the temperature of the water in the hot water storage tank 30 detected by the hot water storage sensor T4, the temperature of the refrigerant in the radiator 11 of the heat exchanger 13, and the refrigerant discharged from the radiator 11 The temperature can be any temperature.

  The hot water discharge valve 36B provided in the hot water discharge pipe 36A of the discharge device 36 is normally closed by the control device, and in this state, water in the hot water storage tank 30 is not discharged from the hot water discharge pipe 36A. And

  During the cooling operation, when the temperature of the water detected by the temperature sensor T6 rises to a predetermined value or more (in this embodiment, 25 ° C. to 30 ° C. or more), the above-described control device controls the hot water discharge pipe. 36A hot water discharge valve 36B is opened. As a result, medium-temperature hot water that is lower in temperature than the hot water taken out from the hot water outlet 37 in the hot water storage tank 30 and higher in temperature than the water taken out from the low temperature hot water outlet 38 is discharged from the hot water discharge pipe 36A to the outside of the hot water tank 30. To be discharged.

  Simultaneously with the discharge of hot water from the hot water discharge pipe 36 </ b> A, an amount of cold water corresponding to the amount of discharged hot water is supplied from the water supply pipe 32 </ b> A of the water supply device 32 into the hot water storage tank 30. The hot water discharged from the hot water discharge pipe 36A to the outside of the hot water storage tank 30 can be used if there is an appropriate use.

  In this way, hot water is discharged from the hot water discharge pipe 36 </ b> A to the outside of the hot water storage tank 30, and at the same time, cold water corresponding to the amount of discharged hot water is supplied into the hot water storage tank 30. The temperature can be lowered, and the hot water in the lower part of the hot water storage tank 30 or the cold water supplied from the water supply device 32 into the hot water storage tank 30 can be supplied to the heat exchanger 13.

  Thereby, in the heat exchanger 13, it becomes possible to ensure the heat radiation amount required for the refrigerant to maintain the cooling action in the evaporator 16. That is, in the heat exchanger 13, the heat of the refrigerant flowing through the radiator 11 can be sufficiently released to the water flowing through the water passage 12, and the temperature of the refrigerant can be lowered, so that the cooling capacity in the evaporator 16 is maintained. As a result, the object to be cooled can be reliably cooled.

  In particular, in the refrigeration cycle apparatus 1 of the present embodiment, the hot water discharge pipe 36 </ b> A of the discharge device 36 is disposed below the high temperature hot water outlet 37 of the hot water storage tank 30 and above the low temperature hot water outlet 38. Specifically, the position of the hot water discharge pipe 36A is preferably attached to the hot water discharge pipe 36A of the discharge device 36 at a position where the volume of water stored in the hot water storage tank 30 from the lower part is about 20L to 50L. That is, when the hot water discharge pipe 36A is attached below the position, the cold water is fed by mixing the cold water flowing into the hot water storage tank from the water supply pipe 32A of the water supply device 32 and the hot water in the hot water storage tank 30 and conducting heat. The effect of introducing cannot be obtained sufficiently. On the contrary, when it is attached above the position, the hot water stored in the hot water storage tank 30 is discharged from the discharge device 36 to the outside of the hot water storage tank 30, and the thermal loss increases. .

  Therefore, a position below the high temperature hot water outlet 37 of the hot water storage tank 30 and above the low temperature hot water outlet 38 and the volume of water stored in the hot water storage tank 30 from the lower part is about 20L to 50L. By attaching the hot water discharge pipe 36A of the discharge device 36 to the hot water supply facility, the hot water is discharged from the discharge device 36 without hindering the hot water supply to the hot water supply load facility, and is released in the radiator 11 of the heat exchanger 13. The amount of heat can also be secured.

  By the way, if the amount of hot water discharged from the discharge device 36 is too small, the amount of cold water flowing into the hot water storage tank 30 becomes insufficient. As a result, the amount of hot water in the hot water storage tank 30 becomes excessive and cooling is performed. May negatively impact capacity and efficiency. Therefore, the effect obtained by providing the discharge device 36 may be extremely reduced. On the other hand, if the amount of hot water discharged from the discharge device 36 is too large, it becomes difficult to control the amount of water flowing through the heat exchanger 13 as hot water is discharged. As a result, the amount of water circulating in the hot water storage circuit 5 is reduced. There is a risk that the temperature of the hot water generated in the heat exchanger 13 will be reduced. Furthermore, the cold water that flows in vigorously from the water supply pipe 32 </ b> A disturbs the temperature stratification inside the hot water storage tank 30, which may increase heat loss in the hot water storage tank 30.

  Therefore, the amount of hot water discharged from the discharge device 36 is set in advance so as to be an appropriate amount. Specifically, the hot water discharge valve 36B or the hot water discharge pipe 36A is provided with an appropriate throttle portion (not shown), and the hot water in the hot water storage tank 30 discharged from the discharge device 36 per unit time. The amount is set in advance so as to be a predetermined value. The predetermined value is larger than the hot water circulation amount (rated flow rate or generated hot water flow rate) of the hot water storage circuit 5 obtained from the heating capacity of the refrigerant circuit 1 and the generated hot water temperature, and It is small enough not to disturb the temperature stratification in the hot water storage tank 30 (high temperature hot water accumulates in the upper part of the hot water storage tank 30, and the temperature of the hot water decreases as it goes downward) without affecting the temperature of the generated hot water. Value. Specifically, about 1.2 to 2 times the rated flow rate of the hot water storage circuit 5 is desirable. For example, in a system in which the amount of hot water generated is 1 L / min, hot water of 1.2 L / min to 2 L / min Emissions are desirable.

  As described above in detail, the refrigeration cycle apparatus 1 of the present embodiment discharges even if the amount of hot water in the hot water storage tank 30 becomes excessive due to an increase in cooling load or a decrease in heating load. The water in the hot water storage tank 30 can be discharged from the device 36 and the cold water can be taken into the hot water storage tank 30 from the water supply device 32 and supplied to the heat exchanger 13. Thus, the disadvantage that the cooling capacity in the evaporator 16 is reduced can be avoided. As a result, the object to be cooled can be reliably cooled.

  Next, another embodiment of the refrigeration cycle apparatus of the present invention will be described. FIG. 2 is a schematic configuration diagram of a refrigeration cycle apparatus according to another embodiment to which the present invention is applied. In FIG. 2, the same reference numerals as those in FIG. 1 indicate the same or similar actions or effects, so the description is omitted, and in this embodiment, the parts different from the above embodiment are mainly described. Explained.

  First, the structural differences between the refrigeration cycle apparatus 100 of the present embodiment and the refrigeration cycle apparatus 1 of the first embodiment will be described. The refrigeration cycle apparatus 1 according to the first embodiment includes a discharge device 36 that discharges hot water in the hot water storage tank 30 as necessary, whereas the refrigeration cycle apparatus 100 according to the present embodiment includes a discharge device 36. Absent. The refrigeration cycle apparatus 100 of the present embodiment includes a water cooling device 80 on a low-temperature pipe 47 that connects the lower part of the hot water storage tank 30 and the inlet of the water passage 12 of the heat exchanger 13. The water cooling device 80 is a heat exchanger for cooling water that flows from the hot water storage tank 30 to the heat exchanger 13 and exchanges heat with the radiator 11 in the heat exchanger 13.

  The water cooling device 80 according to the present embodiment is, for example, a so-called tube-and-fin heat exchanger, and includes a copper pipe and heat transfer promoting aluminum fins provided on the copper pipe. And the flow path for the water taken out from the lower part of the hot water storage tank 30 and supplied to the heat exchanger 13 to flow inside the copper pipe is configured. Also, in the vicinity of the water cooling device 80, a fan 80F for supplying air to the water cooling device 80 for heat exchange with water flowing in the copper pipe, and a fan motor 80M for driving the fan 80F are installed. Has been. The operation of the fan motor 80M is controlled by a control device (not shown) that controls the refrigeration cycle apparatus 100. The type of the water-cooled apparatus 80 is not limited to this, and other types of heat exchangers, for example, aluminum extruded porous flat tubes are used, and a plurality of holes provided in the flat tubes are made into a refrigerant. A so-called microchannel type heat exchanger, a microtube type heat exchanger, or a rolled tube on sheet type heat exchanger may be applied. In addition, the heat medium that cools the water that exchanges heat with the radiator 11 is not limited to the air, and may be a heat medium such as water or brine. In the case where a fluid such as water or brine is used as the heat medium, for example, a counter-flow double pipe heat exchanger or a copper pipe junction heat exchanger can be used.

  Next, the operation of the refrigeration cycle apparatus 100 of the present embodiment with the above configuration will be described. The operation of the refrigerant circuit 2 and the hot water storage circuit 5 during the normal cooling operation and the operation of supplying hot water to the hot water supply load facility, that is, the heat absorption by the evaporator 16 of the refrigerant circuit 2 exerts a cooling action, The operation of cooling the cooling object and generating hot water by the heat dissipation of the refrigerant in the radiator 11 and storing it in the hot water storage tank 30 is the same as in the first embodiment. Omitted.

  During normal cooling operation, the fan motor 80M for supplying air to the water cooling device 80 is stopped by the control device. In this state, the water cooling device 80 has air that exchanges heat with water. Since it is not supplied, heat exchange between water and air flowing through the water cooling device 80 is hardly performed.

  And the refrigerating cycle apparatus 100 of a present Example is the heat exchange for heat-exchanging the temperature of the water which heat-exchanges with the radiator 11 (the water in the hot water storage tank 30, or the water in the heat radiator 11 and the hot water storage tank 30). The temperature of the water circulated through the radiator 13), or when the temperature of the refrigerant in the radiator 11 or the refrigerant exiting the radiator 11 rises above a predetermined value, the water cooling device 80 cools the water. And

  Here, the water cooling operation by the water cooling device 80 will be described in detail. The refrigeration cycle apparatus 100 of the present embodiment is circulated to the heat exchanger 13 for exchanging heat between the radiator 11 detected by the temperature sensor T6 installed on the low temperature pipe 47 and the water in the hot water storage tank 30. When the temperature of the water (the temperature of the water at the inlet of the heat exchanger 13) exceeds a predetermined value, the fan motor 80M is driven by the control device to rotate the fan 80F. The temperature at which the fan motor 80M is driven is not limited to the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 as in this embodiment, but the hot water storage tank 30 detected by the hot water storage sensor T4. The temperature of the inside water may be sufficient, and the temperature of the refrigerant | coolant in the heat radiator 11 of the heat exchanger 13 and the temperature of the refrigerant | coolant which exited the heat radiator 11 may be sufficient.

  The predetermined value for driving the fan motor 80M can be determined based on the temperature of air that exchanges heat with water in the water cooling device 80, for example. That is, when the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 is higher than the temperature of the air, the fan motor 80M is driven by the control device, the fan 80F is rotated, and the water cooling device 80 is turned on. Supply air.

  Thereby, the water taken out from the lower part of the hot water storage tank 30 flows into the copper pipe of the water cooling device 80 through the low temperature pipe 47. Therefore, in the process of passing through the copper pipe, the water taken out from the hot water storage tank 30 releases heat to the air by the ventilation by the fan 80F and becomes a low temperature. Thereby, low temperature water can be supplied to the heat exchanger 13.

  Accordingly, as in the first embodiment, the amount of hot water stored in the hot water storage tank 30 becomes excessive due to an increase in cooling load, a decrease in hot water supply load, etc., and the heat exchanger is taken out from the lower part of the hot water storage tank 30. Even when the temperature of the water supplied to 13 becomes high, water taken out from the lower part of the hot water storage tank 30 can be cooled by the water cooling device 80 and supplied to the heat exchanger 13. it can.

  Thereby, in the heat exchanger 13, it becomes possible to ensure the heat radiation amount required for the refrigerant to maintain the cooling action in the evaporator 16. That is, in the heat exchanger 13, the heat of the refrigerant flowing through the radiator 11 can be sufficiently released to the water flowing through the water passage 12, and the temperature of the refrigerant can be lowered, so that the cooling capacity in the evaporator 16 is maintained. As a result, the object to be cooled can be reliably cooled.

  In this embodiment, the air blowing to the water cooling device 80 is controlled by the operation (drive and stop) of the fan motor 80M, and the presence or absence of cooling in the water cooling device 80 is switched. A bypass pipe that bypasses the cooling device 80 is provided in parallel, and a switching valve is provided that can selectively switch whether the water taken out from the lower part of the hot water storage tank 30 flows into the bypass piping or the water cooling device 80. Even when the switching valve is operated, the same control as in this embodiment can be performed.

  That is, in the normal cooling operation, the switching valve is controlled so that the water from the hot water storage tank 30 supplied to the heat exchanger 13 flows to the bypass pipe (for example, the operation of the switching valve is controlled by the control device). ). When the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 becomes equal to or higher than the predetermined value, the switching valve is switched so that the water from the hot water storage tank 30 flows to the water cooling device 80. Thereby, only when the temperature of the water supplied to the heat exchanger 13 rises, the water can be allowed to flow through the water cooling device 80 to cool the water supplied to the heat exchanger 13.

  In the present embodiment, the water from the hot water storage tank 30 supplied to the heat exchanger 13 is cooled by air in the water cooling device 80. However, the present invention is not limited to this. For example, when the heat medium is a fluid such as water or brine and the heat medium is circulated by a circulation pump, is the cooling performed by operating (driving and stopping) the circulation pump? It is also possible to control whether or not cooling is performed by providing a shut-off valve on the pipe for supplying the heat medium and opening and closing the shut-off valve.

  As described above in detail, also in the refrigeration cycle apparatus 100 of the present embodiment, as in the refrigeration cycle apparatus 1 of the first embodiment, the cooling object is exhibited by the heat absorption by the evaporator 16 to cool the object to be cooled. The heat generated in the cooling process can be used effectively, that is, hot water can be generated by heat dissipation from the radiator 14, and the generated hot water can be supplied to the hot water supply load facility. Therefore, energy consumption can be reduced by effectively using the heat generated in the cooling process that has been conventionally released into the atmosphere without being used.

  Furthermore, according to the refrigeration cycle apparatus 100 of the present embodiment, even if the amount of hot water in the hot water storage tank 30 becomes excessive due to an increase in cooling load or a decrease in heating load, the water cooling apparatus 80 Since the water supplied from the hot water storage tank 30 to the heat exchanger 13 can be cooled, the heat radiation amount of the refrigerant in the radiator 11 is ensured, and the disadvantage that the cooling capacity in the evaporator 16 is reduced can be avoided. Can do. As a result, the object to be cooled can be reliably cooled.

  Next, another embodiment of the refrigeration cycle apparatus of the present invention will be described. FIG. 3 is a schematic configuration diagram of a refrigeration cycle apparatus according to a third embodiment to which the present invention is applied. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 have the same or similar functions or effects, and thus the description thereof will be omitted. The description will focus on the differences.

  First, differences in configuration between the refrigeration cycle apparatus 200 of the present embodiment and the refrigeration cycle apparatus 1 of the first embodiment will be described. The refrigeration cycle apparatus 1 according to the first embodiment includes the discharge device 36 that discharges hot water in the hot water storage tank 30 as necessary, whereas the refrigeration cycle apparatus 200 according to the present embodiment includes the discharge device 36. Not. The refrigeration cycle apparatus 200 of the present embodiment includes a second radiator 90 for cooling the refrigerant that has exited the radiator 11 on the refrigerant pipe 41 that connects the radiator 11 and the expansion valve 14 of the refrigerant circuit 2. The refrigerant pipe 41 between the radiator 11 and the second radiator 90 is provided with a temperature sensor T7 that detects the temperature of the refrigerant that has exited the radiator 11 (the refrigerant temperature after passing through the radiator 11). ing.

  The second radiator 90 is, for example, a so-called tube-and-fin heat exchanger, and includes a copper tube and heat transfer promoting aluminum fins provided on the copper tube. And the channel | path for the refrigerant | coolant from the heat radiator 11 to flow inside the said copper pipe is comprised. Further, in the vicinity of the second radiator 90, a fan 90F for supplying air to the second radiator 90 for heat exchange with a refrigerant flowing in the copper pipe, and a fan motor 90M for driving the fan 90F. Is installed. The operation of the fan motor 90M is controlled by a control device (not shown) that controls the refrigeration cycle apparatus 200. The shape of the second radiator 90 is not limited to this, and other types of heat exchangers such as the microchannel type heat exchanger and the rolled tube on sheet type heat exchanger are applied. It doesn't matter.

  Next, the operation of the refrigeration cycle apparatus 200 of the present embodiment with the above configuration will be described. The operation of the refrigerant circuit 2 and the hot water storage circuit 5 during the normal cooling operation and the operation of supplying hot water to the hot water supply load facility, that is, the heat absorption by the evaporator 16 of the refrigerant circuit 2 exerts a cooling action, The operation of cooling the cooling object and generating hot water by the heat dissipation of the refrigerant in the radiator 11 and storing it in the hot water storage tank 30 is the same as in the first embodiment. Omitted.

  During normal cooling operation, the fan motor 90M for supplying air to the second radiator 90 is stopped by the control device, and in this state, the second radiator 90 exchanges heat with the refrigerant. Since air is not supplied, heat exchange between the water flowing through the second radiator 90 and air is hardly performed.

  And the refrigerating cycle apparatus 200 of a present Example is the heat exchange for heat-exchanging the temperature of the water which heat-exchanges with the radiator 11 (the water in the hot water storage tank 30, or the water in the heat radiator 11 and the hot water storage tank 30). The temperature of the water circulated through the radiator 13), or when the temperature of the refrigerant in the radiator 11 or the refrigerant exiting the radiator 11 rises above a predetermined value, the second radiator 90 causes the radiator 11 to The refrigerant that has come out shall be cooled.

  Here, the cooling operation of the refrigerant by the second radiator 90 will be described in detail. The refrigeration cycle apparatus 200 according to the present embodiment is configured so that when the temperature of the refrigerant exiting the radiator 11 detected by the temperature sensor T7 installed on the refrigerant pipe 41 becomes equal to or higher than a predetermined value, The motor 90M is driven and the fan 90F is rotated. Note that the temperature at which the fan motor 90M is driven is not limited to the temperature of the refrigerant exiting the radiator 11 detected by the temperature sensor T7 as in this embodiment, but is within the hot water storage tank 30 detected by the hot water storage sensor T4. The temperature of the water in the heat exchanger 13 for heat exchange between the radiator 11 detected by the temperature sensor T6 and the water in the hot water storage tank 30 detected by the temperature sensor T6 (the water at the inlet of the heat exchanger 13) Temperature), or the temperature of the refrigerant in the radiator 11 of the heat exchanger 13.

  The predetermined value for driving the fan motor 90M can be determined based on, for example, the temperature of air that exchanges heat with the refrigerant in the second radiator 90. That is, when the temperature of the refrigerant exiting the radiator 11 detected by the temperature sensor T7 becomes higher than the temperature of the air, the fan motor 90M is driven by the control device, and the fan 90F is rotated to rotate the second radiator 90. To supply air.

  As a result, the refrigerant whose temperature has decreased due to heat exchange with the water flowing through the water passage 12 in the radiator 11 of the heat exchanger 13 flows into the copper pipe of the second radiator 90 via the refrigerant pipe 41. . Therefore, the refrigerant from the radiator 11 releases the heat to the air by the ventilation by the fan 90F in the process of passing through the copper pipe, and becomes a lower temperature. Thereby, the specific enthalpy of the refrigerant flowing into the evaporator 16 can be reduced.

  Accordingly, as in the first embodiment, the amount of hot water stored in the hot water storage tank 30 becomes excessive due to an increase in cooling load, a decrease in hot water supply load, etc., and the heat exchanger is taken out from the lower part of the hot water storage tank 30. Even when the temperature of the water supplied to the heater 13 becomes high and the amount of heat released in the radiator 11 decreases, the second radiator 90 cools the refrigerant after passing through the radiator 11, It can be.

  Thus, the second radiator 90 makes it possible to ensure the amount of heat radiation necessary for the refrigerant to maintain the cooling action in the evaporator 16. That is, in the radiator 11, since the temperature of the water passage 12 is high, the heat of the refrigerant can be sufficiently released and the temperature cannot be lowered, but the second radiator 90 releases the heat of the refrigerant to the air. Since the temperature of the refrigerant can be lowered, the cooling capacity in the evaporator 16 can be maintained and the object to be cooled can be reliably cooled.

  In the present embodiment, the ventilation to the second radiator 90 is controlled by the operation (drive and stop) of the fan motor 90M, and the presence or absence of cooling in the second radiator 90 is switched. In addition, a bypass pipe that bypasses the second radiator 90 is provided in parallel, and a switching valve that can selectively switch between flowing the refrigerant from the radiator 11 to the bypass pipe or the second radiator 90 is provided. Thus, even when the switching valve is operated, the same control as in this embodiment can be performed.

  That is, in the normal cooling operation, the switching valve is controlled so that the refrigerant from the radiator 11 flows into the bypass pipe (for example, the operation of the switching valve is controlled by the control device). And if the temperature of the refrigerant | coolant which came out of the heat radiator 11 detected by the temperature sensor T7 becomes more than the said predetermined value, a switching valve will be switched so that the refrigerant | coolant from the heat radiator 11 may flow into the 2nd heat radiator 90. . As a result, when the temperature of the refrigerant after passing through the radiator 11 rises, that is, when a predetermined heat radiation amount cannot be secured in the radiator 11, the refrigerant is allowed to flow through the second radiator 90 and is supplied to the evaporator 16. The supplied refrigerant can be cooled.

  In this embodiment, the refrigerant discharged from the radiator 11 is cooled by air in the second radiator 90, but the heat medium for cooling the refrigerant may be other than air, for example, It is also possible to use a heat medium such as water or brine. When a fluid such as water or brine is used as the heat medium, for example, a counter-flow double pipe heat exchanger or a copper pipe junction heat exchanger is used as the second radiator. Can do. In addition, when a fluid is used as a heat medium and the heat medium is circulated by a circulation pump, it is possible to control whether or not cooling is performed by operating (driving and stopping) the circulation pump. It is also possible to provide a shutoff valve on the pipe for supplying the heat medium and control whether or not cooling is performed by opening and closing the shutoff valve.

  Furthermore, in the refrigeration cycle apparatus 200 of the present embodiment, in addition to cooling of the refrigerant in the second radiator 90, the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 installed on the low-temperature pipe 47. Alternatively, the temperature of the water in the hot water storage tank 30 detected by the hot water storage sensor T4 provided in the hot water storage tank 30 or the inside of the hot water storage tank 30 detected by the hot water temperature sensor T2 installed on the high temperature pipe 48. When the temperature of the hot water entering enters a predetermined value or higher, the circulation pump 31 is stopped and the flow rate adjustment valve 35 is closed.

  The predetermined temperature is determined in consideration of a set temperature (that is, a boiling set temperature) of high-temperature hot water generated in the heat exchanger 13 and stored in the hot water storage tank 30, and is predetermined in the hot water storage tank 30. It is a value that can be determined to be a state where the hot water of is filled. For example, when the temperature of water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 provided on the low temperature pipe 47 is sufficiently close to the target set temperature, the hot water storage tank 30 has a high temperature. It can be determined that the water has been filled. Moreover, the temperature of the hot water in the hot water storage tank 30 detected by the hot water storage sensors T4 installed at a plurality of heights in the hot water storage tank 30 reaches the substantially set temperature, and the temperature of each height is substantially the same. Even when the temperature becomes the same level, it can be determined that the hot water storage tank 30 is filled with hot water. Furthermore, although the flow rate adjustment valve 35 is fully open, the temperature of the hot water entering the hot water storage tank 30 detected by the hot water temperature sensor T2 installed on the high temperature pipe 48 becomes the target hot water temperature. Even when the temperature rises exceeding this level, it can be determined that the hot water storage tank 30 is filled with hot water.

  As described above, when the temperature of the hot water detected by the temperature sensor T6, the hot water storage sensor T4, or the hot water temperature sensor T2 exceeds a predetermined value, the circulation pump 31 is stopped and the flow rate adjustment valve 35 is closed. When the hot water storage tank 30 is filled with hot water and it is not necessary to make hot water any more, it is possible to avoid circulating unnecessary water (hot water). In this case, since water is not circulated in the hot water storage circuit 5, heat exchange between the refrigerant and water is not performed at all in the heat exchanger 13, and therefore, all heat dissipation of the refrigerant is performed in the second radiator 90. Will be.

  As described in detail above, also in the refrigeration cycle apparatus 200 of the present embodiment, similarly to the refrigeration cycle apparatus 1 of the first embodiment, the object to be cooled is cooled by the heat absorption by the evaporator 16 to cool the object to be cooled. The heat generated in the cooling process can be used effectively, that is, hot water can be generated by heat dissipation from the radiator 14, and the generated hot water can be supplied to the hot water supply load facility. Therefore, energy consumption can be reduced by effectively using the heat generated in the cooling process that has been conventionally released into the atmosphere without being used.

  Furthermore, according to the refrigeration cycle apparatus 200 of the present embodiment, even if the amount of hot water in the hot water storage tank 30 becomes excessive due to an increase in cooling load or a decrease in heating load, the second radiator 90 Therefore, the refrigerant after passing through the radiator 11 can be cooled, so that the heat radiation amount of the refrigerant can be secured and the disadvantage that the cooling capacity in the evaporator 16 is reduced can be avoided. As a result, the object to be cooled can be reliably cooled. In particular, in the refrigeration cycle apparatus 200 of the present embodiment, the refrigerant after passing through the radiator 11 is cooled, so that the refrigeration cycle apparatus 100 of the second embodiment configured to cool water supplied to the heat exchanger 13 Since it is excellent in the effect of preventing the cooling capacity from being lowered and the hot water in the hot water storage tank 30 can be kept at a high temperature, the hot water supply capacity can be improved.

  Next, still another embodiment of the refrigeration cycle apparatus of the present invention will be described. FIG. 4 is a schematic configuration diagram of a refrigeration cycle apparatus according to a fourth embodiment to which the present invention is applied. In FIG. 4, the same reference numerals as those in FIGS. 1 to 3 are the same or have similar actions or effects, and thus the description thereof will be omitted. The description will focus on the differences.

  First, differences in configuration between the refrigeration cycle apparatus 300 of the present embodiment and the refrigeration cycle apparatus 1 of the first embodiment will be described. The refrigeration cycle apparatus 1 according to the first embodiment includes the discharge device 36 that discharges hot water in the hot water storage tank 30 as necessary, whereas the refrigeration cycle apparatus 200 according to the present embodiment includes the discharge device 36. Not. The refrigeration cycle apparatus 300 according to the present embodiment includes a second radiator 95 connected in parallel with the radiator 11 of the refrigerant circuit 2, and allows the refrigerant compressed by the compressor 10 to flow to the radiator 11 or be second heat radiation. It is possible to selectively switch the flow to the vessel 95. Specifically, a middle part of the high-pressure refrigerant pipe 40 connected to the inlet of the radiator 11 and a middle part of the refrigerant pipe 41 connected to the outlet of the radiator 11 are connected by a bypass pipe 98, and the bypass pipe The second radiator 95 is installed on the 98, and the switching valve 98B, on the bypass pipe 98 on the inlet side of the second radiator 95 and on the high-pressure refrigerant pipe 40 on the downstream side from the connection point of the bypass pipe 98, respectively. 40B is provided to selectively open and close the switching valves 98B and 40B, thereby allowing the refrigerant from the compressor 10 to flow selectively to the radiator 11 or the second radiator 95. The bypass pipe 98 on the outlet side of the second radiator 95 and the refrigerant pipe 41 upstream from the connection point of the bypass pipe 98 are provided with check valves 99 and 41B, respectively, to prevent the refrigerant from flowing back. It shall be. The switching valve is not limited to the case where it is provided on the bypass pipe 98 on the inlet side of the second radiator 95 and on the high-pressure refrigerant pipe 40 on the downstream side from the connection point of the bypass pipe 98 as in this embodiment. Alternatively, a three-way valve may be installed at the connection point of the bypass pipe 98, and the refrigerant from the compressor 10 may alternatively flow to the radiator 11 or the second radiator 95 by the three-way valve.

  The second radiator 95 is, for example, a so-called tube-and-fin heat exchanger, and includes a copper pipe and heat transfer promoting aluminum fins provided on the copper pipe. And the channel | path for the refrigerant | coolant from the compressor 10 to flow inside the said copper pipe is comprised. Further, in the vicinity of the second radiator 95, there are a fan 95F for supplying air to the second radiator 95 for heat exchange with the refrigerant flowing in the copper pipe, and a fan motor 95M for driving the fan 95F. Is installed. The operation of the fan motor 95M is controlled by a control device (not shown) that controls the refrigeration cycle apparatus 300. The shape of the second radiator 95 is not limited to this, and other types of heat exchangers such as the microchannel type heat exchanger and the rolled tube on sheet type heat exchanger are applied. It doesn't matter.

  Next, the operation of the refrigeration cycle apparatus 300 of the present embodiment with the above configuration will be described. The operation of the refrigerant circuit 2 and the hot water storage circuit 5 during the normal cooling operation and the operation of supplying hot water to the hot water supply load facility, that is, the heat absorption by the evaporator 16 of the refrigerant circuit 2 exerts a cooling action, The operation of cooling the cooling object and generating hot water by the heat dissipation of the refrigerant in the radiator 11 and storing it in the hot water storage tank 30 is the same as in the first embodiment. Omitted.

  During the normal cooling operation, the switching valve 40B is opened, the switching valve 98B is fully closed, and the flow of the refrigerant to the second radiator 95 is shut off. The refrigerant gas thus formed does not flow into the second radiator 95 but flows into the radiator 11. The fan motor 95M is stopped by the control device. Therefore, in this state, heat exchange between the air and the refrigerant in the second radiator 95 is not performed.

  And the refrigerating cycle apparatus 300 of a present Example is the heat exchange for heat-exchanging the temperature of the water which heat-exchanges with the radiator 11 (the water in the hot water storage tank 30, or the water in the heat radiator 11 and the hot water storage tank 30). The temperature of the water circulated through the radiator 13), or when the temperature of the refrigerant in the radiator 11 or from the radiator 11 rises above a predetermined value, the refrigerant flows through the second radiator 95. And

  Here, the cooling operation of the refrigerant by the second radiator 95 will be described in detail. The refrigeration cycle apparatus 300 of the present embodiment is circulated to the heat exchanger 13 for exchanging heat between the radiator 11 detected by the temperature sensor T6 installed on the low temperature pipe 47 and the water in the hot water storage tank 30. When the water temperature (water temperature at the inlet of the heat exchanger 13) exceeds a predetermined value, the switching valve 40B is fully closed, the refrigerant flow to the radiator 11 is shut off, and the switching valve 98B is opened. Then, the refrigerant from the compressor 10 is caused to flow to the second radiator 95. Further, the control device drives the fan motor 95M to rotate the fan 95F. Note that the temperature at which the switching valve 98B is opened and the fan motor 95M is driven is not limited to the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 as in this embodiment, but the temperature of the hot water storage sensor T4. The temperature of the water in the hot water storage tank 30 detected in this way may be used, or the temperature of the refrigerant in the radiator 11 of the heat exchanger 13 or the temperature of the refrigerant that has exited the radiator 11 may be used.

  The predetermined value for opening the switching valve 98B and driving the fan motor 95M is determined in consideration of, for example, the amount of hot water in the hot water storage tank 30 and the temperature of the object to be cooled in the evaporator 16; It is a value that can be determined to be close to a state in which the hot water storage tank 30 is filled with high-temperature hot water, and a value that can exhibit sufficient cooling capacity, and is determined in consideration of the outside air temperature. For example, when the temperature of water supplied from the water supply device 32 to the hot water storage tank 30 is about + 17 ° C., the predetermined value is + 25 ° C., and the heat exchange is detected by the temperature sensor T 6 provided on the low temperature pipe 47. When the temperature of the water at the inlet of the vessel 13 becomes + 25 ° C. or more, the switching valve 40B is fully closed, the switching valve 98B is opened, the fan motor 95M is started, the fan 95F is rotated, 2 Heat dissipation by the radiator 95 is performed.

  As described above, when the temperature of the water at the inlet of the heat exchanger 13 detected by the temperature sensor T6 exceeds a predetermined value, the switching valve 40B is fully closed, the switching valve 98B is opened, and the fan The motor 95M is started, the fan 95F is rotated, and the heat radiation by the second radiator 95 is started.

  Thereby, the high-temperature and high-pressure refrigerant from the compressor 10 flows into the copper pipe of the second radiator 95 via the bypass pipe 98. Therefore, the refrigerant from the compressor 10 becomes low temperature by releasing heat to the air by the ventilation by the fan 95F in the process of passing through the copper pipe. Thereby, the temperature of the refrigerant flowing into the evaporator 16 can be effectively cooled to a predetermined low temperature.

  Accordingly, as in the first embodiment, the amount of hot water stored in the hot water storage tank 30 becomes excessive due to an increase in cooling load, a decrease in hot water supply load, etc., and the heat exchanger is taken out from the lower part of the hot water storage tank 30. Even when the temperature of the water supplied to the heater 13 becomes high and the amount of heat released from the radiator 11 decreases, the refrigerant from the compressor 10 is cooled by the second radiator 95 to a low temperature. Can do.

  Thus, the second radiator 95 makes it possible to ensure the amount of heat radiation necessary for the refrigerant to maintain the cooling action in the evaporator 16. As a result, the cooling capacity of the evaporator 16 can be maintained and the object to be cooled can be reliably cooled.

  Further, in this case, as in the third embodiment, the circulating pump 31 of the hot water storage circuit 5 is stopped and the flow rate adjusting valve 35 is closed, so that the hot water storage tank 30 is filled with hot water and more hot water needs to be produced. When there is no water, it is possible to avoid the circulation of useless water (hot water).

  In the present embodiment, the second radiator 95 is cooled by air. However, as in the third embodiment, the heat medium for cooling the refrigerant may be other than air. It is also possible to use a heat medium such as brine or brine.

  As described in detail above, also in the refrigeration cycle apparatus 300 of the present embodiment, as in the refrigeration cycle apparatus of each of the above-described embodiments, while cooling the object to be cooled by exhibiting a cooling action due to heat absorption by the evaporator 16, The heat generated in the cooling process can be used effectively, that is, hot water can be generated by heat dissipation from the radiator 14, and the generated hot water can be supplied to the hot water supply load facility. Therefore, energy consumption can be reduced by effectively using the heat generated in the cooling process that has been conventionally released into the atmosphere without being used.

  Furthermore, according to the refrigeration cycle apparatus 300 of the present embodiment, even when the amount of hot water in the hot water storage tank 30 becomes excessive due to an increase in cooling load or a decrease in heating load, the compressor 10 The compressed high-temperature and high-pressure refrigerant is caused to flow through the second radiator 95 and radiated by the second radiator 95, so that the heat radiation amount of the refrigerant is secured and the cooling capacity of the evaporator 16 is reduced. It can be avoided in advance. As a result, the object to be cooled can be reliably cooled.

  FIG. 5 is a schematic configuration diagram of a refrigeration cycle apparatus of Example 5 to which the present invention is applied. The refrigeration cycle apparatus of the present embodiment cools and cools milk immediately after milking (the object to be cooled of the present embodiment) in a cooling container, generates hot water with the heat obtained by cooling the milk, It is used for automatic cleaning of cooling containers. The refrigeration cycle apparatus 500 includes a compressor 510, a radiator 511, a refrigerant circuit 502 including an expansion valve 514 and an evaporator 516 as a decompression device, a second compressor 580, a second radiator 581, and a decompression device. The apparatus includes a second refrigerant circuit 508 including an expansion valve 584 and an evaporator 586, a hot water supply circuit 503 including a hot water storage tank 530, and an automatic cleaning device 509 described later.

  The refrigerant circuit 502 is configured such that a compressor 510, a radiator 511, an expansion valve 514, and an evaporator 516 are sequentially connected in a circular pipe to form a closed circuit. Specifically, the high-pressure refrigerant pipe 540 connected to the discharge side of the compressor 510 is connected to the inlet of the radiator 511. The heat radiator 511 is a refrigerant passage that constitutes a part of the heat exchanger 513 and is arranged to be able to exchange heat with the water passage 512 of the hot water supply circuit 503. The heat exchanger 513 is a water-refrigerant heat exchange type heat exchanger that exchanges heat between water in the hot water storage tank 530 of the heat radiator 511 and the hot water supply circuit 503. It consists of a water passage 512. At one end of the heat exchanger 513, an inlet of the refrigerant passage of the radiator 511 and an outlet of the water passage 512 are formed, and at the other end, an outlet of the refrigerant passage of the radiator 511 and an inlet of the water passage 512 are formed. Each is formed. Therefore, in the heat exchanger 513, the high-temperature and high-pressure refrigerant that is discharged from the compressor 510 and flows through the radiator 511 and the water that flows through the water passage 512 are opposed to each other.

  On the other hand, the refrigerant pipe 541 connected to the outlet of the radiator 511 is connected to the inlet of the expansion valve 514. The expansion valve 514 is a decompression device for decompressing the refrigerant radiated by the radiator 511, and the refrigerant pipe 542 connected to the outlet of the expansion valve 514 is connected to the inlet of the evaporator 516. One end of the suction pipe 545 is connected to the outlet of the evaporator 516, and the other end of the suction pipe 545 is connected to the low pressure side (suction part) of the compressor 510. Further, the suction pipe 545 connecting the evaporator 516 and the low pressure side of the compressor 510 is damaged by sucking the liquid refrigerant into the check valve 518 having the compressor 10 side in the forward direction and the compressor 510. An accumulator 517 is provided to protect the compressor 510 from inconveniences. The check valve 518 is installed in order to prevent the refrigerant from flowing back to the evaporator 516 from the high pressure side of the refrigerant circuit 502 during a cold insulation operation to be described later.

  Further, a discharge temperature sensor T1 for detecting the temperature of the high-temperature and high-pressure refrigerant discharged from the compressor 510 is installed in the high-pressure refrigerant pipe 540 of the refrigerant circuit 502.

  In the refrigerant circuit 502 described above, carbon dioxide, which is a natural refrigerant, is enclosed as a refrigerant. Since the pressure on the high pressure side of the refrigerant circuit 502 rises above the critical pressure, the refrigerant circuit 502 enters a transcritical cycle. Further, as the lubricating oil of the compressor 510, for example, mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylene glycol), POE (polyol ether) and the like are used.

  On the other hand, the evaporator 516 cools an object to be cooled (milk in this embodiment) stored in the inner tank 570 of the cooling container 507 and is integrally formed with the cooling container 507. In the cooling container 507, an inner tank 570 in which a space for storing an object to be cooled (milk) is formed inside an outer tank 572 constituting an outer shell, and the inner tank 570 and the outer tank 572 are separated from each other. Between them, for example, a heat insulating material 574 made of a foamable material such as urethane is filled. Further, an outer plate 576 made of a plate material having high thermal conductivity is provided on the outer surface of the inner tank 570 (the bottom surface in FIGS. 6 and 7), and the entire periphery of the outer plate 576 is fixed to the bottom surface of the inner tank 570. Thus, a sealed refrigerant passage space 577 is formed between the bottom surface of the inner tank 570 and the outer plate 576, and this is used as the refrigerant flow path of the evaporator 516.

  In addition to the peripheral portion of the outer plate 576, inner fixing portions 578 fixed to the bottom surface of the inner tank 570 at a plurality of positions are formed at predetermined intervals. Specifically, the entire periphery of the outer plate 576 is fixed to the bottom surface of the inner tank 570 by seam welding, and the portions other than the periphery are spot-welded in a grid pattern or zigzag pattern at a predetermined interval. (The place fixed by spot welding is the inner fixing portion 578).

  Here, the refrigerant flow path (refrigerant passage space 577) of the evaporator 516 is formed by pressurization. Specifically, the entire periphery of the peripheral portion of the outer plate 576 is fixed to the bottom of the inner tank 570 as described above, and then pressure is applied between the inner tank 570 and the outer plate 576 to thereby remove the inner tank 570 from the outer plate 576. A refrigerant passage space 577 is expanded between the plates 576. Therefore, a portion other than the inner fixing portion 578 of the outer plate 576 bulges outward in a substantially arcuate cross section, and this bulge has a grid arrangement or a staggered shape.

  In this case, the bottom surface of the inner tank 570 to which the outer plate 576 is fixed is the refrigerant flowing through the refrigerant flow path (refrigerant passage space 577) of the evaporator 516 and the object to be cooled (milk) stored in the inner tank 570. It is preferable to use a material having high thermal conductivity so that heat exchange with the outer tank 570 can be easily performed. The other inner tank 570, outer plate 576, and outer tank 572 are formed in consideration of corrosivity, durability, and the like. It is desirable to select them. For example, stainless steel may be used as the material of the inner tank 570, the outer plate 576, and the exterior tank 572. Further, the heat insulating material 574 is formed in a space formed between the outer periphery of the inner tank 570 and the outer tank 572 after the outer plate 576 is fixed to the bottom of the inner tank 570 and the outer tank 572 is assembled on the outer side. Shall be injected.

  Further, the cooling container 507 may have various shapes such as a columnar shape, a horizontally placed elliptical column shape, and a rectangular parallelepiped shape. Further, in this embodiment, the outer plate 576 is disposed on the bottom surface of the inner tank so as to efficiently cool the object to be cooled (milk) to form the refrigerant flow path (refrigerant passage space 577) of the evaporator 516. However, it may be further formed on the side surface of the inner tank 570 as necessary. Although not shown in FIG. 6 for simplification of the drawing, the cooling container 507 is provided with an inlet 507A for feeding milk as an object to be cooled and an outlet for taking out the milk (FIG. 6). Not shown).

  The refrigerant passage space 577 (refrigerant flow passage of the evaporator 516) formed between the bottom surface of the inner tank 570 and the outer plate 576 communicates with the refrigerant passage space 577 and includes a plurality of refrigerant inlet pipes 516A. And a refrigerant outlet pipe 516B. The refrigerant inlet pipe 516A is for allowing the refrigerant to flow into the evaporator 516 (refrigerant passage space 577), and one end thereof is connected to the refrigerant passage space 577. The other end of the refrigerant inlet pipe 516A is connected to the refrigerant pipe 542 so that the refrigerant from the refrigerant pipe 542 branches and flows into the refrigerant passage space 577. The refrigerant outlet pipe 516B is for allowing the refrigerant to flow out of the evaporator 516 (refrigerant passage space 577), and has one end connected to the refrigerant passage space 577. The other end of the refrigerant outlet pipe 516B is connected to the suction pipe 545 so that the refrigerant from the refrigerant outlet pipe 516B merges.

  The plate thickness of the inner tank 570 is 2 mm, and the plate thickness of the outer plate 576 is 1 mm. The diameter of the inner fixing portion 578 of spot welding is 6 mm, and the spot pitch is desirably 20 mm or less so as to withstand the use of the carbon dioxide refrigerant. In this embodiment, the spot pitch is 18.5 mm. The outer diameters of the refrigerant inlet pipe 516A and the refrigerant outlet pipe 516B are preferably ½ or less of the spot pitch in order to prevent the strength of the pipe joint from being lowered. In this embodiment, the outer diameter φ6.35 mm (1/4 inch). ) And a plate thickness of 1.0 mm.

  Note that the refrigerant passage space 577 serving as the refrigerant flow path of the evaporator 516 can be freely configured by dividing it by seam welding. For example, it is possible to divide the region into two parts at the center to make the refrigerant flow path into two passes. Another method is to further divide the region into three passes, four passes, or The above refrigerant flow path can also be used. Furthermore, a meandering refrigerant flow path or a spiral refrigerant flow path can be formed by seam welding.

  In this embodiment, the inner tank 570 and the outer plate 576 are fixed by spot welding and seam welding. However, the fixing method is not limited to this, for example, laser welding or the like. It is also possible to fix by this method.

  On the other hand, as shown in FIG. 5, a feeding pipe 550 is detachably connected to the milk inlet 507A of the cooling vessel 507 via an inlet valve 550B, and further, the milk outlet is connected to a milk outlet 552B. An extraction pipe 552 for extracting milk is detachably connected. The milk inlet pipe 550 is attached to the milk inlet 507A only when milk is put into the inner tank 570 of the cooling container 507, and is removed from the milk inlet 507A in other cases. The mouth 507A is sealed. Similarly, the milk extraction pipe 552 is attached to the milk outlet only when milk in the inner tank 570 of the cooling container 507 is taken out, and is removed from the milk outlet in other cases. Is sealed.

  In addition, a milk temperature sensor T5 for detecting the temperature of the milk to be cooled is attached to the outer peripheral surface of the inner tank 570 of the cooling container 507. Further, the cooling vessel 507 is provided with a stirrer 575 for stirring milk in order to promote heat transfer during cooling and to reduce temperature unevenness and perform accurate temperature measurement. The stirrer 575 includes a stirring blade, a stirring motor, and a shaft that couples them.

  On the other hand, the second refrigerant circuit 508 is configured such that a compressor 580, a radiator 581, an expansion valve 584, and an evaporator 586 are sequentially connected in a pipe to form a closed circuit. Specifically, the high-pressure refrigerant pipe 590 connected to the discharge side of the compressor 580 is connected to the inlet of the radiator 581. The heat radiator 581 is a refrigerant passage constituting a part of the heat exchanger 583, and is disposed so as to be able to exchange heat with the second water passage 582 of the hot water supply circuit 503. The heat exchanger 583 is a water-refrigerant heat exchange type heat exchanger that exchanges heat between water in the hot water storage tank 530 of the heat radiator 581 and the hot water supply circuit 503. A water passage 582 is formed. One end of the heat exchanger 583 is formed with an inlet of the refrigerant passage of the radiator 581 and an outlet of the water passage 582, and the other end is provided with an outlet of the refrigerant passage of the radiator 581 and an inlet of the water passage 582. Each is formed. Therefore, in the heat exchanger 583, the high-temperature and high-pressure refrigerant discharged from the compressor 580 and flowing through the radiator 581 and the water flowing through the water passage 582 are opposed to each other.

  On the other hand, the refrigerant pipe 591 connected to the outlet of the radiator 581 is connected to the inlet of the expansion valve 584. The expansion valve 584 is a decompression device for decompressing the refrigerant radiated by the radiator 581, and the refrigerant pipe 592 connected to the outlet of the expansion valve 584 is connected to the inlet of the evaporator 586. The evaporator 586 is, for example, a tube-and-fin type heat exchanger, and includes a copper pipe and heat transfer promoting aluminum fins provided on the copper pipe. And the flow path for the refrigerant | coolant from the expansion valve 584 to flow inside the said copper pipe is comprised. Further, in the vicinity of the evaporator 586, a fan 586F for supplying air (air) as a heat source for heat exchange with water flowing in the copper pipe to the evaporator 586, and a fan motor for driving the fan 586F 586M is installed. Note that the heat source of the evaporator 586 is not limited to the air described above, and water, waste water, solar heat, ground water, and other heat sources can also be used.

  One end of the suction pipe 595 is connected to the outlet of the evaporator 586, and the other end of the suction pipe 595 is connected to the low pressure side (suction part) of the compressor 580. The suction pipe 595 connecting the evaporator 586 and the low pressure side of the compressor 580 is provided with an accumulator 587 for protecting the compressor 580 from inconvenience that liquid refrigerant is sucked into the compressor 580 and damaged. It is installed.

  A discharge temperature sensor T7 for detecting the temperature of the high-temperature and high-pressure refrigerant discharged from the compressor 580 is installed in the high-pressure refrigerant pipe 590 of the second refrigerant circuit 508.

  The second refrigerant circuit 508 is also filled with carbon dioxide, which is a natural refrigerant, as a refrigerant. That is, since the pressure on the high pressure side of the second refrigerant circuit 508 rises above the critical pressure, the refrigerant circuit 508 enters a transcritical cycle. As the lubricating oil of the compressor 580, for example, as with the compressor 510 of the refrigerant circuit 502, for example, mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylene glycol), POE (poe oil). Polyol ether) and the like.

  On the other hand, the hot water supply circuit 503 heats water by receiving heat from the refrigerant flowing through the radiator 511 of the refrigerant circuit 502 or the refrigerant flowing through the radiator 581 of the second refrigerant circuit 508, and thereby supplying hot water. A hot water storage circuit 505 for storing the hot water in the hot water storage tank 530, a water supply device 532 for supplying water into the hot water storage tank 530, a hot water supply device 534 for supplying hot water stored in the hot water storage tank 530 to the hot water supply load facility, It is comprised from the discharge device 536 mentioned later.

  The hot water storage tank 530 is a tank for storing the hot water generated by heat dissipation from the radiator 511 in the heat exchanger 513 or from the radiator 581 in the heat exchanger 583, and the entire outer peripheral surface is insulated. The structure is such that the hot water covered with the material and stored inside is difficult to cool.

  A low temperature pipe 547 for taking out hot water (water) stored in the hot water storage tank 530 from below the hot water storage tank 530 is connected to the lower part of the hot water storage tank 530. The low temperature pipe 547 is connected to the circulation pump. 531 and a flow rate adjusting valve 535, which is connected to an inlet of a water passage 512 formed at the other end of the heat exchanger 513. The circulation pump 531 is for circulating water in the hot water storage circuit 505. The circulation pump 531 of this embodiment discharges water taken out from the lower part of the hot water storage tank 530 to the heat exchanger 513 side or the heat exchanger 583 side, and in the water passages 512 and 582 of the respective heat exchangers 513 and 583. The water in the hot water storage circuit 505 is circulated so that the water flow is opposed to the refrigerant flow in the radiators 511 and 581 as described above (in FIG. 5, water is circulated clockwise). The flow rate adjustment valve 535 is a valve device for adjusting the flow rate of hot water in the hot water storage circuit 505 circulated by the circulation pump 531.

  Further, a three-way valve 547A is installed on the upstream side of the circulation pump 531 in the low-temperature pipe 547, and one end of a bypass pipe 549 is connected to branch from the low-temperature pipe 547 via the three-way valve 547A. The other end of the bypass pipe 549 is connected to the middle part of the high temperature pipe 548. Then, by switching the three-way valve 547A, the water below the hot water storage tank 530 is allowed to flow to the circulation pump 531, hot water after passing through the heat exchanger 513, or hot water after passing through the heat exchanger 583. It is possible to selectively switch whether (water) flows to the circulation pump 531.

  Further, a three-way valve 547B is installed on the downstream side of the flow rate adjustment valve 535 of the low-temperature pipe 547, and a low-temperature pipe 597 is connected so as to branch from the low-temperature pipe 547 via the three-way valve 547B. The low temperature pipe 597 is connected to an inlet of a water passage 582 formed at the other end of the heat exchanger 583. The three-way valve 547B selectively switches whether the water that has passed through the flow rate adjustment valve 535 flows into the heat exchanger 513 or the heat exchanger 583.

  Then, one end of the high temperature pipe 598 is connected to the outlet of the water passage 582 formed at one end of the heat exchanger 583, and the other end of the high temperature pipe 598 is connected to the middle part of the high temperature pipe 548.

  On the other hand, one end of the high temperature pipe 548 is connected to the outlet of the water passage 512 formed at one end of the heat exchanger 513, and the other end of the high temperature pipe 548 is connected to the upper part of the hot water supply tank 530 (the upper end in this embodiment). It is connected. On the downstream side of the connection point of the high-temperature pipe 548 of the high-temperature pipe 548, heat generated from the heat radiator 511 by the heat exchanger 513 or heat from the heat radiator 581 by the heat exchanger 583 is generated. A tapping temperature sensor T2 for detecting the temperature of hot water entering the tank 530 is provided.

  The hot pipe 548 is connected to the upper part of the hot water storage tank 530, and a high temperature hot water outlet 537 for taking out hot hot water from the hot water storage tank 530 is provided. The high temperature hot water outlet 537 is connected to a high temperature hot water outlet pipe 534A of the hot water supply device 534. In addition, the low temperature pipe 547 is connected to the lower part of the hot water storage tank 530, and a low temperature hot water outlet 538 for taking out low temperature hot water from the hot water storage tank 530 is provided. The low temperature hot water outlet 538 is connected to a low temperature hot water outlet pipe 534B of the hot water supply device 534.

  A hot water supply pipe 600 for cleaning is connected to the high temperature hot water discharge pipe 534A, and hot water in the hot water storage tank 530 taken out from the high temperature hot water outlet 537 passes through the hot water supply pipe 600 for cleaning to the automatic cleaning device 509. Supplied. The automatic cleaning device 509 is a device for cleaning the cooling container 507. The hot water stored in the hot water storage tank 530 is taken out from the hot water supply pipe 600 for cleaning and used as cleaning water for the cooling container 507. Yes. The cleaning hot water supply pipe 600 has a check valve 601 for preventing inconvenience that hot water flowing through the cleaning hot water supply pipe 600 flows back to the hot water storage tank 530, and for supplying the hot water as cleaning water. A hot water supply valve 602 is installed. Although not shown in FIG. 5, the cleaning hot water supply pipe 600 includes a temperature sensor that detects the temperature of hot water flowing through the cleaning hot water supply pipe 600, a flow rate sensor that detects the amount of hot water, or It is also possible to install a flow switch or the like.

  Further, in this embodiment, the hot water supplied from the hot water supply pipe 600 for cleaning is used for cleaning the cooling container 507. However, the hot water supply pipe 600 for cleaning is used in an apparatus other than the cooling container 507, for example, a milking machine. Or a milking pipeline (not shown, some of which are connected to the milk input pipe 550), etc., and connected to a washing device for washing, and used as hot water for washing those things Is also possible.

  The mixing valve 610 is connected to the hot water in the hot water storage tank 530 taken out from the high temperature hot water extraction pipe 534A and the low temperature hot water in the hot water storage tank 530 taken out from the low temperature hot water extraction pipe 534B or the low temperature hot water extraction pipe 534B. The water supplied from the water supply device 532 is mixed, adjusted to an optimal temperature, and then supplied to a hot water supply load facility other than the above-described cleaning application. The mixing valve 610 is used for other than the cleaning application. Each is connected to a hot water supply load facility. Then, hot water is supplied to the hot water supply load facility by opening a hot water supply valve (not shown). In addition, a check valve 613 for preventing a back flow to the hot water storage tank 530 is provided in the high temperature hot water extraction pipe 534A and the low temperature hot water extraction pipe 534B connected to the mixing valve 610, respectively.

  A hot water supply pipe 612 from the mixing valve 610 to the hot water supply valve of each hot water supply load facility is provided with a check valve 614 for preventing a back flow to the hot water storage tank 530 and a temperature sensor T3 for use in hot water control. Has been. And the temperature of the hot water supplied to the hot water supply load facility is detected by the temperature sensor T3. The hot water supply valve is, for example, a faucet for hot water supply, and is not limited to one, and a plurality of hot water supply valves may be provided. The hot water supply pipe 612 can be provided with a flow sensor, a flow switch (both not shown), or the like as necessary.

  Furthermore, a water supply pipe 532A of a water supply device 532 is connected to the lower part of the hot water storage tank 530 via a pressure reducing valve 532B. The water supply device 532 supplies water into the hot water storage tank 530, and water corresponding to the amount of hot water used in the hot water supply tank 530, for example, city water, is supplied from the water supply pipe 532A to the hot water storage tank 530. Supplied from the lower part of 530. The water supply pipe 532A is provided with a water supply valve (not shown), and the water supply valve is normally kept open.

  Furthermore, a discharge pipe 560A for discharging hot water in the hot water storage tank 530 when the hot water storage tank 530 is not used is connected to the lower part of the hot water storage tank 530 via a discharge valve 560B.

  Here, the discharge device 536 described above is for discharging the water (hot water) in the hot water storage tank 530 and is disposed below the high temperature hot water outlet 537 and above the low temperature hot water outlet 538. Yes. In this embodiment, a hot water discharge pipe 536A of the discharge device 536 is connected via a hot water discharge valve 536B below the high temperature hot water outlet 537 of the hot water storage tank 530 and above the low temperature hot water outlet 538. In this way, by disposing the discharge device 536 below the high temperature hot water outlet 537 and above the low temperature hot water outlet 538, the hot water in the hot water storage tank 530 taken out from the discharge device 536 can be heated. The hot water is at a lower temperature than the hot water taken out from the outlet 537 and is hotter than the hot water taken out from the low temperature hot water outlet 538. Therefore, by opening the hot water discharge valve 536B as necessary, it becomes possible to discharge the hot water at a medium temperature from the hot water storage tank 530.

  On the other hand, on the outer surface of the hot water storage tank 530, a plurality of hot water storage sensors T4 are disposed at appropriate intervals from the upper part to the lower part. The hot water storage sensor T4 is a sensor for detecting the temperature of each part of hot water stored in the hot water storage tank 530 and the presence or absence of hot water. In this way, by installing a plurality of hot water storage sensors T4 at different heights and detecting the temperature of each part, it is stored in the hot water storage tank 530 while grasping the temperature distribution from the upper part to the lower part of the hot water storage tank 530. It is possible to detect the amount of hot water.

  It should be noted that the capacity of the hot water storage tank 530 is determined in consideration of the amount of milk, which is an object to be cooled, put into the cooling container 507, the assumed hot water supply load, the generation time of each load, and the like. There is a need. That is, when hot water is taken out from the lower part of the hot water storage tank 530 during the cooling operation and flows into the water passage 512 of the heat exchanger 513, the amount of heat released in the radiator 511 is significantly reduced. The cooling capacity and COP of the refrigerant circuit 502 are also deteriorated. Therefore, the capacity of the hot water storage tank 530 should be a hot water storage tank having a sufficient volume that allows low temperature water to be always taken out from the lower part of the hot water storage tank 530 and flowed to the water passage 512 of the heat exchanger 513.

  Specifically, it is necessary to examine individually according to the use conditions. For example, when hot water is not used at the same time as the cooling operation, it is assumed that the cooling container 507 is charged in one cooling operation. It is preferable to use a hot water storage tank having a capacity equal to or exceeding the maximum amount of milk to be cooled. For example, when the object to be cooled (milk) put into the cooling container 507 is 500 liters, the capacity of the hot water storage tank 530 is preferably about 500 liters or more. Further, when it is assumed that hot water is used during the cooling operation, the capacity of the hot water storage tank 530 can be made smaller than the above-described capacity.

  The automatic cleaning device 509 includes a cleaning circuit 630 in which a cleaning circulation pump 631, a cleaning pipe 632, a cooling vessel 507, an extraction valve 552B, a circulation switching valve 634, and a cleaning return pipe 635 are sequentially connected to each other. The cleaning water discharge passage 640 is connected to the cleaning return pipe 635 of the circulation cleaning circuit 630 via the discharge valve 640B, and the cleaning buffer tank 650 is connected to the cleaning return pipe 635 of the circulation cleaning circuit 630. Yes.

  The cleaning buffer tank 650 includes at least one or more detergent supply pipes 652 for supplying detergents and disinfectants, a water supply pipe 654 for supplying cleaning water (city water in this embodiment), and the hot water supply circuit. A cleaning hot water supply pipe 600 for supplying hot water for cleaning from 503 is connected. The water supply pipe 654 is provided with a water supply valve 654B, and water supply to the cleaning buffer tank 650 is controlled by the water supply valve 654B. A detergent supply pump (not shown) for supplying detergent is provided on the detergent supply pipe 652, and the other end of the detergent supply pipe 652 is connected to a detergent container (not shown).

  With the above configuration, the operation of the refrigeration cycle apparatus 500 of the present embodiment will be described.

(1) Cooling operation of the object to be cooled (milk) First, the operation during the cooling operation for cooling the milk to be cooled will be described. A milking pipeline connected to a milking machine (not shown) and a cooling container 507 are connected by the milk charging pipe 550, the charging valve 550B is opened, and milk immediately after milking is charged into the cooling container 507. At this time, the milk extraction valve 552B is in a closed state. The temperature of milk immediately after milking is about the same as or slightly lower than the body temperature of the cow, specifically about 35 ° C to 38 ° C. Therefore, for the purpose of preventing the generation of bacteria and maintaining the quality of milk, the refrigerant circuit 502 is operated to cool and cool the milk.

  After the start of milking (after the start of feeding milk), the compressor 510 of the refrigerant circuit 502 is driven, and at the same time, the stirrer 575 is also driven. Normally, the compressor 510 is driven to start a cooling operation after a predetermined amount of milk is stored in the cooling container 507. However, in order to prevent freezing, the stirrer 575 is prevented from idling. Thus, the cooling operation may be started simultaneously with the start of milk input or before the milk input.

  When the compressor 510 is driven, a low-temperature and low-pressure refrigerant gas is sucked into the low-pressure side (suction part) of the compressor 510 from the suction pipe 545 and compressed. As a result, the refrigerant gas that has reached high temperature and pressure enters the high-pressure refrigerant pipe 540 from the discharge side and is discharged to the outside of the compressor 510. At this time, the refrigerant is compressed to an appropriate supercritical pressure.

  The high-temperature and high-pressure refrigerant discharged from the compressor 510 enters the heat exchanger 513 from the inlet of the radiator 511 through the high-pressure refrigerant pipe 540. The high-temperature and high-pressure refrigerant gas releases heat to the water in the hot water storage circuit 505 flowing through the water passage 512 provided in heat exchange with the radiator 511 in the process of passing through the radiator 511 of the heat exchanger 513. It is cooled and becomes low temperature. On the other hand, the heat in the radiator 511 heats the water in the water passage 512 to generate hot water.

  At this time, in the heat radiator 511, the state of the refrigerant is usually a liquid phase equal to or higher than the critical pressure. That is, since carbon dioxide is used as the refrigerant in this embodiment, the refrigerant pressure in the radiator 511 is equal to or higher than the critical pressure, and the refrigerant does not condense in the radiator 511. The temperature of the refrigerant gradually decreases along with the heat radiation to the water in the water passage 512. On the other hand, in the water passage 512 of the heat exchanger 513, the temperature of water gradually increases from the inlet toward the outlet as heat is absorbed from the refrigerant. In this way, by using the carbon dioxide refrigerant and setting the refrigerant pressure in the radiator 511 to be equal to or higher than the critical pressure, it is compared with the condensation heat radiation under a constant temperature like a conventional refrigerant, for example, an HFC refrigerant. Thus, highly efficient heat exchange is possible, and high-temperature hot water can be generated. Further, in the heat exchanger 513, since the refrigerant passage constituting the radiator 511 and the water passage 512 are installed so as to face each other as described above, heat is more efficiently exchanged between the water and the refrigerant. be able to.

  The low-temperature and high-pressure refrigerant cooled by the radiator 511 exits the heat exchanger 513 from the outlet of the radiator 511, passes through the refrigerant pipe 541, expands at the expansion valve 514, becomes low pressure, and passes through the refrigerant pipe 542. To the evaporator 516. The state of the refrigerant at the inlet of the evaporator 516 is a two-phase mixed state in which liquid refrigerant and vapor refrigerant are mixed. In the evaporator 516, the liquid-phase refrigerant absorbs heat from the milk to be cooled to evaporate into a vapor refrigerant. At this time, the milk is cooled by the heat absorption.

  The refrigerant evaporated in the evaporator 516 exits the evaporator 516, enters the suction pipe 545, passes through the check valve 518 and the accumulator 517, and is sucked into the compressor 510 again from the low pressure side (suction part). repeat. By repeating the above cycle, the milk is cooled by the heat absorption by the evaporator 516, and at the same time, hot water is generated by the heat radiation from the heat radiator 511.

  Moreover, when the milking is completed, the feeding of the milk into the cooling container 507 is finished, but the cooling operation described above is continued until the milk reaches a predetermined temperature. Here, the temperature of the milk is detected by a milk temperature sensor T5 attached to the outer peripheral surface of the inner tank 570. The predetermined temperature at which the cooling operation is terminated is set from the viewpoint of suppressing the generation of bacteria in milk and maintaining the quality, and is specifically about 4 ° C. Further, during the cooling operation, the opening degree of the expansion valve 514 is adjusted so that the temperature of the discharge refrigerant detected by the discharge temperature sensor T1 installed in the high-pressure refrigerant pipe 540 of the refrigerant circuit 502 becomes a predetermined value. Specifically, when the refrigerant temperature detected by the discharge temperature sensor T1 rises above a predetermined value, the opening degree of the expansion valve 514 is expanded. Conversely, when the refrigerant temperature detected by the discharge temperature sensor T1 becomes lower than a predetermined value, the opening degree of the expansion valve 514 is reduced. Thereby, the highly efficient driving | running on the suitable conditions in the driving | operation which generate | occur | produces the hot water suitable for a washing | cleaning use can be performed.

  The rotation speed of the compressor 510 during the cooling operation may be constant, or the frequency may be adjusted by an inverter or the like.

(2) Operation of Hot Water Supply Circuit 503 During Cooling Operation Next, the operation of the hot water supply circuit 503 during the cooling operation will be described. First, the three-way valve 547A is switched so that water from the lower part of the hot water storage tank 530 flows to the circulation pump 531, and the three-way valve 547B has the refrigerant circuit 502 (milk cooling refrigerant circuit 502) that has passed through the flow rate adjustment valve 535. The heat exchanger 513 is switched to flow.

  When the above-described cooling operation is started, the circulation pump 531 of the hot water supply circuit 503 is activated, and low temperature hot water or water (hereinafter abbreviated as water) passes through the low temperature pipe 547 from the lower part of the hot water storage tank 530. Then, the refrigerant is sucked into the circulation pump 531 and pushed out to the low-temperature pipe 547 on the heat exchanger 513 side connected to the outlet of the circulation pump 531. Thereby, the water pushed out from the circulation pump 531 flows into the heat exchanger 513 from the inlet of the water passage 512 through the flow rate adjustment valve 535. In the heat exchanger 513, the water flowing in the water passage 512 is heated by receiving heat from the radiator 511 by heat exchange with the refrigerant flowing in the radiator 511 as described above, and high-temperature hot water is generated. The hot water that has exited the heat exchanger 513 from the outlet of the water passage 512 passes through the high temperature pipe 548 of the hot water storage circuit 505 and is injected into the hot water storage tank 530 from the upper part (upper end) of the hot water storage tank 530. In the hot water storage tank 530, the hot water generated in the heat exchanger 513 is injected from the upper part, and the water is taken out from the lower part. Water is stored at the bottom and low-temperature water is stored.

  Further, the flow rate adjusting valve 535 adjusts the flow rate of water so that the temperature of hot water at the outlet of the water passage 512 of the heat exchanger 513 becomes a predetermined value. In this embodiment, the flow rate adjustment valve 535 is controlled based on the temperature of hot water at the outlet of the water passage 512 of the heat exchanger 513 detected by the hot water temperature sensor T2. That is, when the temperature of the hot water at the outlet of the water passage 512 detected by the hot water temperature sensor T2 is higher than a predetermined temperature, the opening degree of the flow rate adjustment valve 535 is expanded. Thereby, the circulation amount (flow rate) of the water circulating in the hot water storage circuit 505 can be increased.

  On the other hand, when the temperature of the hot water at the outlet of the water passage 512 detected by the hot water temperature sensor T2 is lower than a predetermined temperature, the opening degree of the flow rate adjustment valve 535 is reduced. Thereby, the circulation amount (flow rate) of the water circulating in the hot water storage circuit 505 can be reduced. In this embodiment, the temperature of the hot water at the outlet of the water passage 512 is detected by the hot water temperature sensor T2 installed in the middle of the high-temperature pipe 548. However, the present invention is not limited to this, and the water passage of the heat exchanger 513 is used. Of course, a temperature sensor may be installed at the 512 outlet to detect the temperature of the hot water at the outlet of the water passage 512. The predetermined temperature is preferably determined according to the intended use within a range of about 50 ° C. to 85 ° C., specifically a temperature suitable for hot water use.

  As described above, in the cooling operation of the refrigeration cycle apparatus 500 of the present embodiment, the milk immediately after milking put in the cooling container 507 is cooled to a predetermined temperature in order to maintain the quality, and the refrigerant circuit 502 Hot water can be generated by heat dissipation on the high temperature side, and the hot water can be stored in the hot water storage tank 530.

(3) Cooling operation of the object to be cooled (milk) When the milk temperature reaches a predetermined value by the cooling operation described above, the compressor 510 is stopped, the expansion valve 514 is fully closed, and the stirrer 575 is stopped. The cooling operation is terminated, and the milk stored in the cooling container 507 is cooled. In this case, although the cooling container 507 is insulated by the heat insulating material 574 as described above, the temperature of milk rises due to heat penetration from the outside during long-term storage.

  Therefore, during the cold-retaining operation, the milk temperature sensor T5 continues to detect the temperature of the milk stored in the cooling container 507 even when the compressor 510 is stopped (hereinafter referred to as standby), and the milk temperature is a predetermined value. When the value exceeds the value, the cooling operation is started to cool the milk. Then, when the milk temperature is cooled to a predetermined temperature by the cooling operation during the cold insulation operation, the cooling operation is stopped and the standby state is entered again. The predetermined temperature for starting the cooling operation during the cold insulation operation is specifically about 4.5 ° C., and the predetermined temperature for stopping the cooling operation is about 4 ° C.

  The expansion valve 514 is fully closed during the standby, together with the action of the check valve 518 provided between the evaporator 516 on the suction pipe 545 and the accumulator 517, and from the high pressure side of the refrigerant circuit 502 to the evaporator 516. This is to prevent the refrigerant from flowing into the milk and suppress the heat from entering the milk to be cooled. A shut-off valve or the like is provided on the suction pipe 545 instead of the check valve 518, or on the refrigerant pipe 542 or the refrigerant pipe 541 instead of the expansion valve 4, so that the shut-off valve can be used during standby in the cooling operation. The same effect can be obtained by closing.

  Here, it is assumed that the stirrer 575 is intermittently driven at regular intervals during the cold-reserving operation. For example, a stirring operation for 2 minutes is performed at intervals of 30 minutes. This is because when the stirrer 575 is stopped, a temperature distribution on the stratification is generated inside the cooling vessel 507 due to the density difference due to the difference in the temperature of the milk, so that accurate temperature measurement cannot be performed.

  Since the operation of the refrigerant circuit 502, the operation of the hot water supply circuit 503, and the like during the cold insulation operation are the same as those of the above-described cooling operation, detailed description thereof is omitted here. In the refrigeration cycle apparatus 500 of the present embodiment, hot water can be stored using the exhaust heat at the time of cooling simultaneously with the cooling of the milk even in the cooling operation during the cold storage operation.

(4) Cooling operation and cooling operation pattern on general farms The cooling operation and cooling operation associated with the input of milk during milking have been described above. Next, cooling operation and cooling operation on a general farm A driving pattern of driving will be described.

  In a general farm, milking is performed about 2 to 3 times a day, and in the second and subsequent milking, milk immediately after milking is stored in a cooling container 507 in which cooled and kept milk is stored. Is added. As a result, since the milk temperature inside the cooling container 507 rises, the cooling operation is started, and when the temperature reaches a predetermined temperature, the cooling operation is stopped and the cooling operation is performed as described above.

  Further, milk may be taken out from the cooling container 507 (milk collection) every day or every other day. Therefore, from the time of the first milking to the collection of the milk, the cooling operation and the cooling operation by introducing the milk are repeated 2 to 6 times.

(5) Cleaning operation Next, the cleaning operation will be described. As described above, the milk cooled and kept in the cooling container 507 is taken out from the outlet when the milk is collected. Specifically, the milk extraction pipe 552 is connected to the milk extraction valve 552B, the milk extraction valve 552B is opened, and the milk is extracted from the cooling container 507. And after taking out milk, in order to keep the inside of the cooling container 507 clean, to suppress the growth of bacteria and to ensure the quality of milk, a washing operation by the automatic washing device 509 is performed.

  Usually, the cooling container 507 is washed after milk is taken out from the cooling container 507. Therefore, when collecting daily, it is performed once a day, and when collecting every other day, it is performed once every two days. Further, in this embodiment, washing hot water can be supplied for washing a milking machine and a milking pipeline (not shown), but washing of the milking machine and the milking pipeline is performed every time milking is finished. Perform two to three times a day.

  The washing process is basically the same whether the cooling container 507 is washed or the milking pipeline is washed. That is, a rinsing step with water, a rinsing step with hot water, a washing step with a plurality of types of detergents such as an alkaline detergent and an acidic detergent, and a sterilizing step with a bactericide are performed. In each of these steps, hot water or water is supplied, and a predetermined amount of detergent and disinfectant are supplied in a predetermined amount, and then the cleaning liquid (mixed liquid of the hot water or water and detergent, etc.) as necessary. Is circulated and washed for a predetermined time in the apparatus (in the cooling container 507 when the cooling container 507 is cleaned), and then the cleaning liquid is discharged.

  Each of the above steps is performed a required number of times in a predetermined order. For example, first, a rinsing step with water is performed, then, a rinsing step with hot water, an alkali cleaning step with hot water and an alkaline detergent, and a rinsing with hot water. After performing the process, the acid washing process with hot water and an acidic detergent, and rinsing with water, the sterilization process with a bactericide is performed.

  Before milk collection is completed and cleaning is performed, first, the milk extraction pipe 552 is removed from the extraction valve 552B, and the cleaning water flows from the extraction valve 552B to the cleaning return pipe 635, and the extraction valve 552B is opened. Keep it. In the rinsing step with water, the cleaning discharge valve 640B and the circulation switching valve 634 are closed, the cleaning circulation pump 631 is stopped, the water supply valve 654B is opened, and the cleaning buffer tank 650 is provided via the water supply piping 654. Supply a fixed amount of cleaning water. Note that whether or not the amount of water in the cleaning buffer tank 650 has reached a predetermined value can be detected by, for example, a float type level switch.

  When the amount of water in the cleaning buffer tank 650 reaches a predetermined value, the water supply valve 654B is closed and the circulation pump 631 is put in an operating state, so that the water in the cleaning buffer tank 650 passes through the cleaning pipe 632 and is cooled. 507 is supplied. When injecting water from the cleaning pipe 632 into the cooling container 507, in order to enable efficient cleaning, water is sprayed from the nozzle and sprayed uniformly on each part inside the cooling container 507. Yes. It is also possible to operate the agitator 575 as necessary.

  When the water in the washing buffer tank 650 runs out, the operation of the washing circulation pump 631 is stopped, the circulation switching valve 634 and the washing discharge valve 640B are opened, and the rinse water is discharged from the washing water discharge passage 640. The above is one process of rinsing with water, and this process is repeated a predetermined number of times as necessary.

  The rinsing process using hot water is basically the same operation as the rinsing process using water described above. The only difference is that hot water is supplied instead of water. That is, in the water rinsing process, the water supply valve 654B is opened and water is supplied, but in the hot water rinsing process, the hot water stored in the hot water storage tank 530 is used for cleaning hot water supply piping by opening the hot water supply valve 602. The cleaning buffer tank 650 is supplied to the cleaning buffer tank 650 through 600. Description of other similar operations is omitted.

  In the cleaning process using the detergent, the cleaning drain valve 640B and the circulation switching valve 634 are closed, the cleaning circulation pump 631 is stopped, the hot water supply valve 602 is opened, and the cleaning buffer tank 650 is passed through the cleaning hot water supply pipe 600. A predetermined amount of hot water is supplied to. At the same time, a detergent supply pump (not shown) is driven to supply a predetermined amount of a predetermined amount of detergent to the cleaning buffer tank 650 via the detergent supply pipe 652. The type and amount of detergent to be supplied are determined in advance according to each step, and the amount of the detergent is adjusted by the driving time of a detergent supply pump (not shown).

  When the amount of hot water in the cleaning buffer tank 650 (mixed solution of hot water and detergent) reaches a predetermined value, the hot water valve 602 is closed and the circulation pump 631 is put in an operating state, whereby the cleaning liquid in the cleaning buffer tank 650 is It passes through the cleaning pipe 632 and is supplied into the cooling container 507. When injecting the cleaning liquid from the cleaning pipe 632 into the cooling container 507, in order to enable efficient cleaning, the cleaning liquid is sprayed from the nozzle and sprayed uniformly on each part inside the cooling container 507. Yes. It is also possible to operate the agitator 575 as necessary.

  When the cleaning liquid in the cleaning buffer tank 650 runs out, the operation of the cleaning circulation pump 631 is stopped. Until the predetermined amount of cleaning liquid is stored in the cooling container 507, the circulation switching valve 634 and the cleaning discharge valve 640B remain closed, the hot water supply valve 602 is opened again, and a predetermined amount of hot water is supplied into the cleaning buffer tank 650. The operation of closing the hot water supply valve 602, driving the circulation pump 631, and supplying hot water into the cooling vessel 507 is repeated. Here, since the amount of hot water supplied and stored in the cooling container 507 can be known from the capacity of the buffer tank 650 and the number of times the above operation is repeated, by predetermining the number of times to store in the buffer tank 650, Appropriate amount can be managed.

  After a predetermined amount of cleaning liquid (mixed solution of hot water and detergent) is stored in the cooling container 507, the circulation switching valve 634 is opened and the cleaning circulation pump 631 is driven for a predetermined time. The cleaning liquid sequentially returns from the cooling container 507 to the cooling container 507 through the extraction valve 552B, the circulation switching valve 634, the cleaning return pipe 635, the cleaning circulation pump 631 and the cleaning pipe 632, and circulates in the circulation cleaning circuit 630. Thereby, the dirt by the milk inside the cooling container 507 can be removed. When injecting the cleaning liquid from the cleaning pipe 632 into the cooling container 507, in order to enable efficient cleaning, the cleaning liquid is sprayed from the nozzle and sprayed uniformly on each part inside the cooling container 507. ing. It is also possible to operate the agitator 575 as necessary.

  After the cleaning liquid is circulated for a predetermined time, the cleaning circulation pump 631 is stopped, the cleaning discharge valve 640B is opened, and the cleaning liquid in the circulation cleaning circuit 630 is discharged from the discharge pipe 640.

  The operation of the sterilization process is basically the same as the operation of the cleaning process using the detergent. The difference is that the detergent to be injected is a disinfectant, that water is used instead of hot water, and that the time for circulation is different. The sterilization process is performed according to the next use time, and the sterilization effect is enhanced by leaving the sterilization liquid (mixture of sterilizer and water) in the cooling vessel 507 and the circulation cleaning circuit 630 for a predetermined time. ing. Detailed descriptions of operations common to the rinsing process and the cleaning process using the detergent are omitted.

  Note that the expansion valve 514 is fully closed to reduce heat loss due to the refrigerant entering the evaporator 516 during standby for the cold insulation operation. However, during the cleaning operation, particularly when washing with hot water is performed. In order to avoid an abnormally high pressure inside the evaporator 516, it is desirable to open the expansion valve 514.

  Further, when the required hot water supply load is large and the amount of hot water generated by milk cooling is insufficient, it is possible to generate hot water by performing the cooling operation even during the cleaning operation. For example, in the sterilization process, by performing the cooling operation while holding the sterilizing liquid in the cooling container 507, a highly efficient hot water supply operation (heat pump operation) using the sterilizing liquid as a heat source becomes possible. Furthermore, if necessary, the cooling operation (hot water supply operation) can be performed by additionally introducing water as a heat source into the cooling container 507.

(6) Hot water supply operation to applications other than cleaning applications Next, hot water supply operation to applications other than the above-described cleaning applications will be described. Hot water is supplied to a hot water supply load other than the cleaning application by opening the hot water supply valve. When the hot water supply valve is opened, the hot water stored in the hot water storage tank 530 flows from the upper part of the hot water storage tank 530 to the mixing valve 610 via the high temperature hot water extraction pipe 534A, and the water from the water supply device 532 or the hot water storage tank 530 is supplied. Low temperature hot water from the inner and lower parts flows to the mixing valve 610 via the low temperature hot water extraction pipe 534B connected to the lower part of the hot water storage tank 530. Then, hot water and water or low temperature hot water are mixed by the mixing valve 610 and adjusted to a predetermined temperature, and then the hot water is supplied to each hot water supply load facility via the hot water supply valve.

  The temperature of the supplied hot water is detected by a hot water supply temperature sensor T3 provided on a pipe connecting the mixing valve 610 and the hot water supply valve. Since the water supply valve is normally open, an amount of city water corresponding to the amount of hot water supplied to other hot water supply load facilities is supplied from the water supply pipe 532A of the water supply device 532 to the hot water storage tank 530 of the hot water supply circuit 503. Supplied in.

  As described above, according to the refrigeration cycle apparatus 500 of the present embodiment, milk that is an object to be cooled is cooled, and hot water is generated by effectively using the heat on the high temperature side of the refrigerant circuit 502 generated in the cooling process. In addition, by using a transcritical cycle using a carbon dioxide refrigerant, high temperature hot water can be used, and this hot water can be used for cleaning the cooling vessel 507 and the like. Therefore, the energy consumed can be greatly reduced compared to the case where hot water is conventionally boiled and supplied by a boiler or the like for cleaning purposes. In addition, since the heat released from the high temperature side of the refrigerant circuit 502 to the atmosphere can be reduced, an increase in the ambient temperature can be suppressed.

(7) Hot water supply operation using the second refrigerant circuit 508 Next, the operation of the second refrigerant circuit 508 will be described. The second refrigerant circuit 508 is a hot water supply operation (heat pump operation) that generates hot water by absorbing heat from a heat source other than milk such as air when the hot water supply load is large and the hot water obtained when cooling milk is insufficient. )It can be performed.

  Since the operation of the second refrigerant circuit 508 is almost the same as that of the refrigerant circuit 502, detailed description thereof is omitted. The difference from the refrigerant circuit 502 is that the refrigerant absorbs heat from the atmosphere in the evaporator 586. That is, the refrigerant absorbs heat from the atmosphere in the evaporator 586, and the heat is released into the water passage 582 provided in a heat exchange manner with the radiator 581 by the heat exchanger 583. Thereby, the water flowing through the water passage 582 is heated, and hot water is generated.

  During the hot water supply operation, the opening degree of the expansion valve 584 is adjusted so that the temperature of the discharge refrigerant detected by the discharge temperature sensor T7 installed in the high-pressure refrigerant pipe 590 of the second refrigerant circuit 508 becomes a predetermined value. Specifically, when the refrigerant temperature detected by the discharge temperature sensor T7 rises above a predetermined value, the opening degree of the expansion valve 584 is expanded. Conversely, when the refrigerant temperature detected by the discharge temperature sensor T7 becomes lower than a predetermined value, the opening degree of the expansion valve 584 is reduced. Thereby, the highly efficient driving | running on the suitable conditions in the driving | operation which generate | occur | produces the hot water suitable for a washing | cleaning use can be performed.

  Next, the operation of the hot water supply circuit 503 during the hot water supply operation will be described. In this case, the three-way valve 547A is switched so that the water from the lower part of the hot water storage tank 530 flows to the circulation pump 531, and the three-way valve 547B is switched so that the water that has passed through the flow rate adjustment valve 535 flows to the heat exchanger 583. It shall be. During the hot water supply operation, the circulation pump 531 of the hot water supply circuit 503 is operated, and low temperature hot water or water from the lower part of the hot water storage tank 530 passes through the low temperature pipe 547, passes through the circulation pump 531 and the flow rate adjustment valve 535, and It flows to the inlet of the water channel 582. In the heat exchanger 583, as described above, the water flowing in the water flow path 582 is heated by heat exchange with the refrigerant flowing in the radiator 581 to generate high-temperature hot water. Then, the hot water that has exited the water flow path 582 of the heat exchanger 583 is poured into the hot water storage tank 530 from the upper part of the hot water storage tank 530 through the high temperature pipe 598 and the high temperature pipe 548 in order. In the hot water storage tank 530, hot water is poured from the upper part, and low temperature water is taken out from the lower part. Therefore, by utilizing the density difference due to the difference in water temperature, the hot water in the upper part of the hot water storage tank 530 is hot and the lower part is cold. Of water is stored.

  Further, the flow rate adjustment valve 535 adjusts the flow rate of water so that the temperature of hot water at the outlet of the water flow path 582 of the heat exchanger 583 becomes a predetermined value. Specifically, when the temperature of the hot water at the outlet of the water channel 582 is higher than a predetermined temperature, the flow rate adjustment valve 535 is increased to increase the flow rate of the water. When the temperature is low, the flow rate of the water is decreased by decreasing the opening degree of the flow rate adjusting valve 535. The temperature of the hot water at the outlet of the water channel 582 is detected by a hot water temperature sensor T2 attached to the high temperature pipe 548. In addition, the predetermined temperature is a temperature suitable for a cleaning application or other hot water supply application, and specifically, it is preferably determined within a range of about 50 to 85 ° C. according to the use application.

  As described above, the hot water supply operation by the second refrigerant circuit 508 is performed when the amount of hot water generated by the milk cooling operation is insufficient for the required hot water supply load, and the required amount of hot water. The length of time during which the hot water supply operation is performed, that is, the amount of hot water to be generated is determined. However, if all of the hot water storage tank 530 is filled with high temperature hot water, the hot water flows into the heat exchanger 513 from the lower part of the hot water storage tank 530 during the cooling operation, and the cooling capacity and efficiency are remarkably reduced. It becomes difficult to perform cooling. Therefore, in the hot water supply operation, the hot water storage tank 530 is not completely filled with hot water, and a cold water portion corresponding to the amount used in the cooling operation must be secured below the hot water storage tank 530 without fail. is there.

  The amount of hot water stored in the hot water storage tank 530 in the hot water supply operation by the second refrigerant circuit 508 depends on the conditions for using the refrigeration cycle apparatus 500, that is, the amount of milk (breeding scale), the amount of hot water used, etc. For example, the hot water supply operation by the second refrigerant circuit 508 is started when the amount of hot water becomes 1/5 or less of the hot water storage tank 530, and the hot water supply operation by the second refrigerant circuit 508 is stopped when the amount of hot water becomes 1/2 or more. Control can be considered. The amount of hot water stored in the hot water storage tank 530 can be grasped by the hot water storage sensor T4.

  As described above, since the refrigeration cycle apparatus 500 of the present embodiment includes the second refrigerant circuit 508, when the required hot water supply load cannot be provided only with hot water generated during the cooling of milk, By performing a hot water supply operation using as a heat source, a deficient amount of hot water can be generated. Therefore, an auxiliary boiler or the like for additional hot water supply is not required, and since highly efficient heat pump hot water supply is performed, energy consumption can be further reduced.

(8) Three-way valve 547A switching operation Next, the operation of the three-way valve 547A will be described. The three-way valve 547A prevents low temperature hot water from flowing into the upper part of the hot water storage tank 530 and disturbing the temperature stratification inside the hot water storage tank 530 when the cooling operation and the hot water supply operation are started and stopped. A predetermined time TL1 from the start of the cooling operation or the hot water supply operation, the hot water storage tank 530 side of the three-way valve 547A is shut off, and the hot water (or water) from the bypass pipe 549 is switched to flow to the circulation pump 531. Thus, the hot water flowing from the water passage 512 of the heat exchanger 583 of the second refrigerant circuit 508 or the water passage 512 of the heat exchanger 513 or the predetermined time TL1 from the start of the cooling operation or the hot water supply operation is stored. It does not flow into the tank 530, but passes from the high temperature pipe 548 to the water passage 512 of the heat exchanger 513 or the heat exchanger 583 of the second refrigerant circuit 508 via the bypass pipe 549, the three-way valve 547 A, and the circulation pump 531. Flow through a closed circuit, returning to the water passage 582.

  In addition, for a predetermined time TL2 from the start of the cooling operation or the hot water supply operation, the flow rate adjustment valve 535 is fixed at a predetermined opening that can ensure a sufficient flow rate, and after the predetermined time TL2 has elapsed, the opening is gradually reduced, The flow rate is reduced, and finally, the opening degree is adjusted so that the hot water temperature sensor T2 attached to the high temperature pipe 548 becomes a predetermined value.

  After the predetermined time TL1 has elapsed, the three-way valve 547A is switched so that the bypass pipe 549 side is shut off and the water from the lower part of the hot water storage tank 530 flows to the circulation pump 531. As a result, hot water flowing from the water passage 512 of the heat exchanger 513 or the water passage 582 of the heat exchanger 583 of the second refrigerant circuit 508 flows to the hot water storage tank 530.

  The predetermined times TL1 and TL2 can be determined in advance, or the heat exchanger 513 detected by the tapping temperature sensor T2 or the heat exchanger 583 of the second refrigerant circuit 508 can be used. The operation can also be performed based on the temperature of the hot water at the outlet. When the cooling operation is started, the flow rate adjustment valve 535 is fixed at a predetermined opening, and when the tapping temperature rises to a predetermined value or more, the opening of the flow rate regulation valve 535 is gradually reduced, and the tapping temperature rises further. When the predetermined temperature is reached, the three-way valve 547A may be switched so that the bypass pipe 549 side is shut off and the water from the lower part of the hot water storage tank 530 flows to the circulation pump 531.

  As described above, it is possible to avoid the problem of disturbing the temperature stratification of the hot water already stored in the hot water storage tank 530 and lowering the temperature of the hot water stored. As a result, the heat loss of the hot water stored is reduced, and the hot water can be used effectively.

  Also, the discharge temperature immediately after the compressor 510 (or the compressor 580) is started in order to ensure a sufficient flow rate at a constant opening without performing the hot water temperature control by the flow rate adjustment valve 535 at the start of the cooling operation or the hot water storage operation. An abnormal rise and abnormally high pressure can be avoided.

  On the other hand, immediately after the cooling operation or the hot water supply operation is stopped, if the predetermined time has elapsed from the stop of the operation of the compressor 510 (or the compressor 580) or the hot water temperature becomes a predetermined value or less, the hot water storage of the three-way valve 547A is performed. The tank 530 side is shut off, and the hot water (or water) from the bypass pipe 549 is switched to flow to the circulation pump 531. Thereafter, the circulating pump 531 is operated for a predetermined time. As a result, hot water flowing from the water passage 512 of the heat exchanger 513 or the water passage 582 of the heat exchanger 583 of the second refrigerant circuit 508 does not flow into the hot water storage tank 530, but from the high-temperature pipe 548 to the bypass pipe 549. Then, it flows through a closed circuit that returns to the water passage 512 of the heat exchanger 513 or the water passage 582 of the heat exchanger 583 of the second refrigerant circuit 508 via the three-way valve 547A and the circulation pump 531.

  Therefore, it is possible to prevent low temperature hot water from flowing into the hot water storage tank 530 from the upper part of the hot water storage tank 530 and disturb the temperature stratification inside the hot water storage tank 530, and to perform heat exchange of the heat exchanger 513 or the second refrigerant circuit 508. The device 583 can be properly cooled.

  When the normal cooling operation or hot water supply operation is performed except for the above-described start and stop times, the three-way valve 547A shuts off the bypass pipe 549 side and circulates water from the lower portion of the hot water storage tank 530. 531 is switched to flow. When neither the cooling operation nor the hot water supply operation is performed, the three-way valve 547A is switched so that the hot water storage tank 530 side is shut off and the bypass pipe 549 side is communicated. When neither the cooling operation nor the hot water supply operation is performed, by switching to the above-described state, when hot water for cleaning use or the like is supplied, it flows from the water supply pipe 532 to the lower part of the hot water storage tank 530. The problem is that cold water flows into the upper portion of the hot water storage tank 530 via the heat exchanger 513 or the hot water storage circuit 505 on the heat exchanger 583 side of the second refrigerant circuit 508, and lowers the temperature of the hot water to be supplied. Can be avoided.

  Next, the hot water storage tank by the discharge device 536 connected below the high temperature hot water outlet 537 connected to the high temperature hot water outlet piping 534A of the hot water storage tank 530 and above the low temperature hot water outlet 538 connected to the low temperature hot water outlet piping 534B. The water discharge operation at 530 will be described. The hot water discharge valve 536B provided in the hot water discharge pipe 536A of the discharge device 536 is normally closed, and in this state, water in the hot water storage tank 530 is not discharged from the hot water discharge pipe 536A.

  And the temperature of the water circulated to the heat exchanger 513 for exchanging heat between the radiator 511 and the water in the hot water storage tank 530 during the cooling operation (the temperature of the water at the inlet of the water passage 512 of the heat exchanger 513). Is raised above a predetermined value, the hot water discharge valve 536B of the hot water discharge pipe 536A is opened. As a result, medium temperature hot water having a temperature lower than that of hot water taken out from the hot water outlet 537 in the hot water storage tank 530 and higher than water taken out from the low temperature hot water outlet 538 is transferred from the hot water discharge pipe 536A to the outside of the hot water tank 530. To be discharged.

  Simultaneously with the discharge of hot water from the hot water discharge pipe 536A, an amount of cold water corresponding to the amount of discharged hot water is supplied from the water supply pipe 532A of the water supply device 532 into the hot water storage tank 530. In the refrigeration cycle apparatus 500 of the present embodiment, when the temperature of the water at the inlet of the water passage 512 of the heat exchanger 513 rises to a predetermined value or higher, for example, 25 ° C. to 30 ° C. or higher, the discharge device 536 stores hot water. Although the water in the tank 530 is discharged, the temperature at which the water in the hot water storage tank 530 is discharged by the discharge device 536 is the temperature of the water at the inlet of the water passage 512 of the heat exchanger 513 as in this embodiment. The temperature of the water in the hot water storage tank 530 detected by the hot water storage sensor T4 is not limited, and the temperature of the refrigerant in the radiator 511 of the heat exchanger 513 or the temperature of the refrigerant that has exited the radiator 511 is acceptable. It doesn't matter. Further, the hot water discharged from the hot water discharge pipe 536A to the outside of the hot water storage tank 530 can be used if there is an appropriate use.

  In this way, hot water is discharged from the hot water discharge pipe 536A to the outside of the hot water storage tank 530, and at the same time, cold water corresponding to the amount of discharged hot water is supplied into the hot water storage tank 530. The temperature can be lowered, and the hot water whose temperature has decreased in the lower part of the hot water storage tank 530 or the cold water supplied from the water supply device 532 into the hot water storage tank 530 can be supplied to the heat exchanger 513. Become.

  Thereby, in the heat exchanger 513, it is possible to secure a heat radiation amount necessary for the refrigerant to maintain the cooling action in the evaporator 516. That is, in the heat exchanger 513, the heat of the refrigerant flowing through the radiator 511 can be sufficiently released to the water flowing through the water passage 512, and the temperature of the refrigerant can be lowered, so that the cooling capacity in the evaporator 516 is maintained. Thus, it is possible to reliably cool the object to be cooled (milk).

In addition, as invention which can be grasped | ascertained in the above description, the following can be considered other than each claim of a claim. That is,
3. The invention according to claim 2, further comprising a high temperature hot water outlet provided at an upper portion of the hot water storage tank and a low temperature hot water outlet provided at a lower portion of the hot water storage tank, wherein the discharge device is located below the high temperature hot water outlet. The refrigeration cycle apparatus is arranged above the low temperature hot water outlet.

  The present invention is not limited to a device that cools and cools milk immediately after milking as in Example 5 above, but includes, for example, a cooling device related to processing of food, vending machines, air conditioners, and other cooling / cooling coolers. It can also be used in other industrial fields where demands are required.

It is a schematic block diagram of the refrigerating-cycle apparatus of Example 1 to which this invention is applied. It is a schematic block diagram of the refrigerating-cycle apparatus of Example 2 to which this invention is applied. It is a schematic block diagram of the refrigerating-cycle apparatus of Example 3 to which this invention is applied. It is a schematic block diagram of the refrigerating-cycle apparatus of Example 4 to which this invention is applied. It is a schematic block diagram of the refrigerating-cycle apparatus of Example 5 to which this invention is applied. It is sectional drawing which showed schematic structure of the cooling container of the refrigeration cycle apparatus of FIG. It is sectional drawing which showed schematic structure of the evaporator of the refrigeration cycle apparatus of FIG.

DESCRIPTION OF SYMBOLS 1,100,200,300,500 Refrigeration cycle apparatus 2,502 Refrigerant circuit 3,503 Hot water supply circuit 5,505 Hot water storage circuit 10,510,580 Compressor 11,511,581 Radiator 12,512,582 Water passage 13, 513, 583 Heat exchanger 14, 514, 584 Expansion valve 16, 516, 586 Evaporator 30, 530 Hot water storage tank 36, 536 Discharge device 80 Water cooling device 90, 95 Second radiator

Claims (2)

A refrigerant circuit including a compressor, a radiator, a decompression device and an evaporator, and a hot water storage tank, and heat exchange between the water in the hot water storage tank and the heat radiator allows heat to be released from the heat radiator. In the refrigeration cycle apparatus formed and stored in the hot water storage tank and exhibiting a cooling action by heat absorption by the evaporator,
A water supply device for supplying water into the hot water storage tank; a discharge device for discharging water in the hot water storage tank; and a hot water outlet provided at the upper part of the hot water storage tank,
A discharge pipe of the discharge device is disposed in the hot water storage tank below the hot water hot water outlet,
The temperature of the water circulating in the heat exchanger for exchanging heat between the water in the hot water storage tank or the heat exchanger and the water in the hot water storage tank, or the temperature in the heat radiator or the heat radiator The refrigeration cycle apparatus, wherein when the temperature of the refrigerant rises to a predetermined value or more, the water in the hot water storage tank is discharged by the discharge device. The refrigeration according to claim 1, wherein the hot water storage tank has a low temperature hot water outlet at a lower portion, and the discharge pipe of the discharge device is disposed in the hot water storage tank above the low temperature hot water outlet. Cycle equipment.

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