JP2006220335A - Composite type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite type air conditioner capable of carrying out stable operation of a water heat source heat pump even when a flow rate of heat source water is a predetermined value or less when carrying out air conditioning mode operation that is opposite to a water heat source. <P>SOLUTION: In the composite type air conditioner, a supply path of the heat source water can be changed by a cold and hot water control valve 13 between a first path passing through a water-refrigerant heat exchanger 17 via a water amount adjusting tubing 15, a second path bypassing the water amount adjusting tubing 15 and passing through the water-refrigerant heat exchanger 17, and a third path bypassing the water amount adjusting tubing 15 and the water-refrigerant heat exchanger 17 and passing through a water-air heat exchanger 27. When an air conditioning load is different from an operation mode of a heat source device, the cold and hot water control valve 13 is changed such that the heat source water passes through the first and second paths. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite air conditioner comprising a combination of a brine type air conditioner and a direct expansion type air conditioner.

  Conventionally, air conditioners that combine brine heat exchangers and direct expansion heat exchangers have special applications such as clean rooms, air conditioning in cold areas, and humidity control as described in the Air Conditioning Sanitation Engineering Handbook. As a target air conditioner, it is generally used as a package with a hot water coil or an air handling unit with a direct expansion coil.

  In addition, as a countermeasure to the problem of building air conditioning using water heat source heat pump and fan coil unit as prior art, power consumption leveling and cooling / heating load coexisting in 2-pipe fan coil system, What unitized the water heat source heat pump is known (for example, refer patent documents 1-5 grade).

JP 58-133542 A JP-A-6-068392 JP-A-7-104019 Japanese Patent No. 2901911 JP 2004-218998 A

  However, the main use of the air conditioner according to the above prior art is to improve the conventional air conditioner that can only cool or heat all rooms depending on the season because air conditioning is performed using a two-pipe fan coil unit. Therefore, the heat source and piping are used as they are for refurbishment for the purpose of air conditioning free of air conditioning.

  However, pipes that have been used for many years with cold / hot water, which is the heat source water, are difficult to pass due to the original pressure loss because the passage area decreases with time due to scale adhesion, etc. However, there is a problem that it is difficult to secure the specified amount of water. A situation such as inability to drive occurs.

  By the way, in the composite air conditioner described in Patent Document 5, when the operation mode of the heat source device and the operation mode of the heat pump are the same, when the heat source water is hot water, the water-to-refrigerant heat exchanger is an evaporator. If the heat source water is cold water, it acts as a condenser, so even if the flow rate of the heat source water is small, the temperature difference between the heat source water and the refrigerant is large, so sufficient capacity can be ensured if an acceptable flow rate can be secured. The allowable range of the flow rate of the heat source water is wide.

  However, when cooling is performed when the heat source water is warm water, the water heat source heat pump performs cooling operation while condensing the refrigerant by releasing heat to the warm water. In other words, when the water source heat pump performs cooling operation, if the amount of hot water flowing through the water-to-refrigerant heat exchanger that functions as a condenser is small, heat cannot be dissipated sufficiently, and the refrigerant becomes hot and its pressure increases. Therefore, a situation occurs in which the refrigerator must be stopped.

  When heating is performed when the heat source water is cold water, the water heat source heat pump absorbs heat from the cold water to evaporate the refrigerant and perform the heating operation. In other words, when the water heat source heat pump performs heating operation, if there is little chilled water flowing through the water-to-refrigerant heat exchanger functioning as an evaporator, the chilled water becomes abnormally cold and can be frozen because it absorbs heat from the small amount of chilled water For this reason, the refrigerator must be stopped. In general, a method is employed in which a freezing prevention temperature detector is attached and the refrigerator is stopped before the temperature of the cold water reaches the freezing temperature.

  When air conditioning mode operation is performed in reverse to the water heat source, that is, when cooling is performed while warm water is flowing as heat source water, or when heating is performed while cold water is flowing, the flow rate of the heat source water is When there is less, there is a problem that it hardly functions as an air conditioner.

  Conventionally, as a technique for solving the above-mentioned problem, a method has been adopted in which a constant pressure valve is provided, and when the refrigerant pressure exceeds a predetermined value, hot gas bypass is performed by the constant pressure valve to avoid high pressure. It was done.

  However, the above method sacrifices the heat pump capacity instead of not stopping the refrigerator, and the heat source water decreases and the fan coil capacity decreases, so that it is in a situation where it is desired to back up with the heat pump, The function as an air conditioner could not be satisfied because the heat pump capability was not exhibited.

  This conventional method will be described with reference to FIG.

  FIG. 8 is a circuit diagram of a combined air conditioner when cooling operation is performed when the heat source water is hot water. During this cooling operation, the high-pressure gaseous refrigerant discharged from the water heat source heat pump compressor 11 is It flows to the water-to-refrigerant heat exchanger 17 that functions as a condenser via the four-way valve 12, and in this water-to-refrigerant heat exchanger, it dissipates heat to the hot water that is the heat source water and condenses. The condensed liquid refrigerant is adiabatically expanded and depressurized in the cooling capillary tube 18-2, and then flows to the refrigerant-to-air heat exchanger 28 functioning as an evaporator. This refrigerant-to-air heat exchanger In 28, the latent heat of vaporization is removed from the air to evaporate and return to the water heat source heat pump compressor 11. Thereafter, the same operation is repeated to cool the room.

  Here, if the flow rate of the hot water that is the heat source water is insufficient, the refrigerant cannot sufficiently dissipate heat to the hot water in the water-to-refrigerant heat exchanger 17, so that the water heat source heat pump compressor 11 can be operated safely. In the case where the pressure is exceeded, a part of the refrigerant is bypassed by the water-to-refrigerant heat exchanger 17 by the constant pressure valve 20 installed between the water heat source heat pump compressor 11 and the water-to-refrigerant heat exchanger 17. The bypassed refrigerant is combined with another refrigerant that flows through the normal route (the refrigerant that is condensed in the water-to-refrigerant heat exchanger 17 and then adiabatically expanded in the cooling capillary 18-2), and these are combined with the air pair. The refrigerant is sent to the refrigerant heat exchanger 28.

  In this way, the high-temperature refrigerant (hot gas) bypassing the water-to-refrigerant heat exchanger 17 and the low-temperature refrigerant (low-temperature gas) adiabatically expanded in the cooling capillary tube 18-2 are mixed. Will evaporate by exchanging heat with air for air conditioning in the refrigerant-to-air heat exchanger 28 in a state where the enthalpy and circulation amount are reduced. For this reason, the air temperature does not drop sufficiently, the temperature of the refrigerant returning to the water heat source heat pump compressor 11 rises, and the refrigerant discharged from the water heat source heat pump compressor 11 becomes higher in temperature and pressure. . That is, the operation is continued by creating a state in which sufficient cooling capacity sufficient for cooling cannot be exhibited.

  In addition, since the conventional combined air conditioner uses air conditioning heat source water as the heat source of the water heat source heat pump, when the operation mode of the heat source device differs from the indoor load, that is, the heat source water is cold water and heating is required. If the heat source water is hot water and cooling is required, the water-to-refrigerant heat exchanger 17 acts as an evaporator when the heat source water is cold water, and acts as a condenser when the heat source water is hot water. To do. Therefore, even if a predetermined amount of water is secured as the heat source water, the amount of water passing through the water-to-refrigerant heat exchanger 17 is not changed depending on the operation mode, so the capacity of the water heat source heat pump when the operation mode of the heat source device differs from the indoor load. Is smaller than that in the case where the operation mode of the heat source device and the indoor load are the same.

  The present invention has been made in view of the above problems, and the purpose of the operation is to operate the heat source device even when the flow rate of the heat source water is equal to or less than a predetermined value when performing the air conditioning mode operation opposite to the water heat source. Combined air-conditioning that ensures stable heat pump capacity equivalent to the case where the mode and indoor load are the same, and enables stable water heat source heat pump operation by avoiding high refrigerant pressure and freezing of heat source water To provide an apparatus.

In order to achieve the above object, the invention according to claim 1 is characterized in that a composite air conditioner comprising a combination of a brine type air conditioner and a water heat source heat pump air conditioner is configured as follows. That is, a compressor for a water heat source heat pump, a four-way valve, a water-to-refrigerant heat exchanger, a refrigerant adiabatic expansion means, a refrigerant-to-air heat exchanger, a water amount adjusting capillary, a water heat source inlet temperature detector, An air supply fan including a motor, a water-to-air heat exchanger, a cold / hot water control valve, a drain pan, a suction air temperature sensor, and a control device for controlling the room temperature,
The supply path of the heat source water includes a first path that passes through the water-to-refrigerant heat exchanger via the water amount adjusting thin tube by the cold / hot water control valve, and the water amount control tube that bypasses the water amount adjusting thin tube. A heat source device capable of switching to a second path passing through the refrigerant heat exchanger and a third path passing through the water-to-air heat exchanger by bypassing the water amount adjusting thin tube and the water-to-refrigerant heat exchanger; When the operation mode differs from the air conditioning load, the cold / hot water control valve is switched so that the heat source water passes through the first and second paths.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the water-to-refrigerant heat exchanger is constituted by a plate heat exchanger.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the water amount adjusting narrow tube is constituted by a constant flow valve.

  According to the present invention, when the operation mode of the heat source device that requires a sufficient flow rate for the heat source water is different from the operation mode of the heat pump, that is, during the period when hot water is flowing or during the period when cold water is flowing In this case, the flow rate of the heat source water passing through the water-to-refrigerant heat exchanger can be increased, and even if the heat source water is less than the predetermined flow rate, the required heat pump capacity is maintained and stabilized. You can drive.

  When the operation mode of the heat source device and the air conditioning load are different, the heat source water is increased to the water-to-refrigerant heat exchanger so that sufficient heat exchange can be performed between the heat source water and the refrigerant. The capacity of the water heat source heat pump equivalent to the case where the indoor load is the same can be ensured, and air conditioning according to the resident's preference in each zone can be realized within a range of various air conditioning loads.

  Furthermore, when cooling / heating operation is performed with cold / hot water, if the capacity is insufficient, the water heat source heat pump performs the cooling / heating operation in the same mode as the heat source device, and if there is no air conditioning load, perform the air blowing operation. Can save energy. When the heat source device supplies hot water to cool it, heat is supplied from the heat pump to the hot water, and when cold water is supplied and heated, the heat pump supplies cold water to the cold water to reduce the load on the heat source device. Therefore, energy saving operation can be realized.

  In addition, even if the heat source device fails, at least if the heat source water circulates, the cooling / heating operation can be performed only by the water heat source heat pump. Therefore, the combined air conditioner is a backup of the heat source device. It can also serve as a device. And since the amount of water flow to the water-to-air heat exchanger and the amount of water flow to the water-to-refrigerant heat exchanger can be controlled proportionally using the water amount adjusting capillary, for example, the capacity of the water-to-air heat exchanger Even if the water flow rate is changed, the water flow rate to the water-to-refrigerant heat exchanger can be kept substantially constant by replacing the water volume adjustment tube. As a result, the water heat source heat pump can always operate stably. Thus, for example, a device having a capacity suitable for the size of a hotel guest room can be easily provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a basic configuration diagram of a combined air conditioner according to the present invention. The illustrated combined air conditioner includes an air supply fan 21 including a fan motor, a water-to-air heat exchanger 27, a refrigerant to air heat. An exchanger 28 and a drain pan (not shown) are arranged. A suction air temperature sensor 29 is provided in the vicinity of the air supply fan 21.

  Here, the water-to-air heat exchanger 27 and the refrigerant-to-air heat exchanger 28 are arranged in series in this order from the upstream side with respect to the airflow from the air supply fan 21. The supply fan 21 including the fan motor may be located upstream or downstream of the water-to-air heat exchanger 27 and the refrigerant-to-air heat exchanger 28 in terms of structure. The air supply fan 21 is disposed upstream of the water-to-air heat exchanger 27 and the refrigerant-to-air heat exchanger 28 in order to reduce the supply air sound.

  The composite air conditioner includes a control device (not shown) for controlling the indoor temperature, a water heat source heat pump compressor 11, a four-way valve 12 for switching between heating and cooling operations, a water-to-refrigerant heat exchanger 17, and refrigerant control. A check valve 16 for heating, a capillary tube for heating 18-1, a capillary tube for cooling 18-2, and the like are arranged. It should be noted that other throttle means such as an expansion valve may be used in place of the capillary tubes 18-1 and 18-2.

  By the way, in the present embodiment, a plate heat exchanger is adopted as the water-to-refrigerant heat exchanger 17, and a sufficient heat exchange amount can be ensured even if the temperature difference between the heat source water and the refrigerant is small. Miniaturization can be realized at the same time.

  Thus, in the present embodiment, the cold / hot water control valve 13 for switching the supply path of the heat source water is provided, and the supply of the heat source water supplied from the heat source device (not shown) to the combined air conditioner. The route is switched between a route communicating with the water-to-refrigerant heat exchanger 17 via the water amount adjusting thin tube 15 and a route communicating with the water-to-air heat exchanger 27 via the cold / hot water control valve 13. Instead of the water amount adjusting thin tube 15, a constant flow valve 15b may be provided as shown in FIG.

  Usually, the control device (not shown) compares the set temperature of the indoor remote controller (not shown) with the indoor temperature detected by the suction temperature sensor 29, and based on the result, the cold / hot water control valve 13 supplies the heat source water to the water. The flow is changed by determining whether it flows to the air heat exchanger 27 or to the water-to-refrigerant heat exchanger 17, and the room temperature is controlled by performing air conditioning or simply performing a blowing operation.

  However, when the capacity is insufficient due to cooling / heating with the heat source water, or when the mode of the cold / hot water is different from the air conditioning load in the room, that is, when the water must be heated despite the cold water flowing, or the hot water flows conversely However, when the air must be cooled, the water source heat pump is operated to control the room temperature.

  Next, the control procedure of the composite air conditioner according to the present invention will be described based on the flowchart shown in FIG.

  Whether the heat source device is in the heating operation or the cooling operation is determined based on the temperature of the water heat source detected by the water heat source inlet temperature detector 19 installed at the water heat source inlet (step S1).

  When it is determined that the heat source device is in the heating operation based on the temperature of the water heat source detected by the water heat source inlet temperature detector 19 (when the determination in step S1 is No), the cold / hot water coil performs the heating cycle operation. (Step S2), for example, it is determined whether or not the set temperature set by an indoor remote controller (not shown) is higher than the room temperature detected by the intake air temperature sensor 29 (Step S3), and the room temperature is lower than the set temperature. In the case (when the determination in step S3 is Yes), it is determined whether or not the room temperature is lower than the first predetermined temperature (set temperature-1 ° C.) (step S4). The first predetermined temperature can be changed, but is generally set to (set temperature-1 ° C.).

  As a result of the above determination, when the room temperature is lower than the first predetermined temperature (when the determination in step S4 is Yes), the cold / hot water control valve 13 is switched so that the hot water passes through the water-to-air heat exchanger 27. Then, a heating operation (water / heating operation) is performed in which the hot water heats the room by exchanging heat with air-conditioning air in the water-to-air heat exchanger 27 (step S5).

  When a certain time has elapsed after the heating operation, it is determined whether or not the room temperature is lower than a second predetermined temperature (set temperature -2 ° C) (step S6). When the temperature does not rise to the predetermined temperature 2 (when the determination result in step S6 is Yes), a heating operation command is output to the water source heat pump in order to further increase the heating capacity. Then, the water heat source heat pump starts the operation by setting the four-way valve 12 to the heating mode, and the refrigerant discharged from the water heat source heat pump compressor 11 is supplied to the air for air conditioning in the refrigerant-to-air heat exchanger 28. The heating operation is performed to release the condensation heat (step S7), and the refrigerant condensed and liquefied in the refrigerant-to-air heat exchanger 28 is adiabatically expanded in the heating capillary tube 18-1, and then the water-to-refrigerant heat. The refrigerant evaporates and vaporizes by exchanging heat with warm water in the exchanger 17, and the vaporized refrigerant is returned to the water heat source heat pump compressor 11. A conceptual flow of the hot water and the refrigerant at this time is shown in FIG.

  The reason why the capillary tube for heating 18-1 and the capillary tube for cooling 18-2 are selectively used via the check valve 16 is to realize a stable heat pump cycle for each operation mode. . Here, any capillary tube may be used as long as it expands adiabatically according to the flow rate of the refrigerant, and a temperature type expansion valve or an electronic expansion valve may be used instead. It can be used for both air conditioning and heating.

  While the water / heating operation and the water heat source heat pump / heating operation are being performed, it is determined whether the room temperature detected by the intake air temperature sensor 29 has reached a set temperature set by an unshown indoor remote controller or the like. (Step S8) When the room temperature reaches the set temperature (the determination result in Step S8 is Yes), the water heat source heat pump is stopped (Step S9), and only the heating operation using hot water is continued (Step S10). Note that while the room temperature does not reach the set temperature (No in step S8), the water / heating operation and the water heat source heat pump / heating operation are continued.

  While only the heating operation using hot water is continued, it is determined whether or not the room temperature detected by the intake air temperature sensor 29 has reached the set temperature + 1 ° C. set by the indoor remote controller or the like (step S11). When the temperature reaches (set temperature + 1 ° C.) (Yes in step S11), the hot / cold water control valve 13 is switched so that the hot water bypasses the water-to-air heat exchanger 27, and heating by the hot water is stopped. (Step S12). At this time, the entire amount of hot water returns to the heat source device via the water-to-refrigerant heat exchanger without heat exchange.

  On the other hand, when the room temperature does not reach (set temperature + 1 ° C.) (when the determination result in Step S11 is No), the heating operation (water / heating operation) using the hot water is continued (Step S5).

  On the other hand, when the judgment result in step S3 is No (when the room temperature is higher than the set temperature), the hot / cold water control valve 13 is switched so that the hot water bypasses the water-to-air heat exchanger 27 and Water flow to the air heat exchanger 27 is stopped (step S13), and it is determined whether the room temperature is higher than a third predetermined temperature (set temperature + 2 ° C.) (step S14). The setting of the third predetermined temperature can be changed, but is generally set to (set temperature + 2 ° C.).

  Thus, when the room temperature is higher than the third predetermined temperature (set temperature + 2 ° C.) (when the determination result in Step S14 is Yes), a cooling operation command is output to the water source heat pump. Direct expansion / cooling operation is performed (step S15). That is, the water heat source heat pump starts operation by setting the four-way valve 12 to the cooling mode, and the refrigerant discharged from the water heat source heat pump compressor 11 exchanges heat with hot water in the water-to-refrigerant heat exchanger 17. After being condensed and liquefied and adiabatically expanded in the cooling capillary tube 18-2, the refrigerant evaporates by heat exchange with the air-conditioning air in the process of passing through the refrigerant-to-air heat exchanger 28, and absorbs heat from the air-conditioning air. Therefore, the cooling operation is performed, and the vaporized refrigerant is returned to the water heat source heat pump compressor 11. FIG. 4 shows a conceptual flow of the hot water and the refrigerant at this time.

  During the cooling operation, it is determined whether or not the room temperature has decreased to the set temperature (step S16), and when the room temperature has decreased to the set temperature (Yes in step S16), the heat source water supplies hot water. The cooling operation (direct expansion / cooling operation) by the water heat source heat pump is stopped (step S17). This cooling operation is continued until the room temperature drops to the set temperature (No in step S16).

  By the way, when the heating operation by the hot water is stopped and the heating operation and the cooling operation by the water heat source heat pump are not performed, the fan operation is performed.

  On the other hand, when the determination result in step S1 is Yes (when it is determined that the heat source device is in cooling operation according to the temperature of the water heat source), the cold / hot water coil performs cooling cycle operation (step S18).

  For example, it is determined whether or not the set temperature set by an indoor remote controller (not shown) is lower than the room temperature detected by the intake air temperature sensor 29 (step S19), and when the room temperature is higher than the set temperature (step S19). In the case where the determination in (Yes) is), it is determined whether or not the room temperature is higher than a fourth predetermined temperature (set temperature + 1 ° C.) (step S20). The fourth predetermined temperature can be changed, but is generally set to (set temperature + 1 ° C.).

  As a result of the above determination, when the room temperature is higher than the fourth predetermined temperature (when the determination in step S20 is Yes), the chilled water control valve 13 is switched so that the chilled water flows to the water-to-air heat exchanger 27. Performs a cooling operation (water / cooling operation) by exchanging heat with air for air conditioning in the water-to-air heat exchanger 27 (step S21).

  When a certain time has elapsed after the cooling operation, it is determined whether or not the room temperature is higher than a fifth predetermined temperature (set temperature + 2 ° C.) (step S22). When the temperature does not drop to the predetermined temperature (set temperature + 2 ° C.) (when the determination result in step S22 is Yes), a cooling operation command is output to the water source heat pump in order to further increase the cooling capacity. Then, the water heat source heat pump starts operation by setting the four-way valve 12 to the cooling mode, and the refrigerant discharged from the water heat source heat pump compressor 11 exchanges heat with cold water in the water-to-refrigerant heat exchanger 17. After being condensed and adiabatically expanded in the cooling capillary tube 18-1, cooling operation is performed by absorbing heat from the air-conditioning air in the refrigerant-to-air heat exchanger 28 and evaporating (step S23). The refrigerant is returned to the water heat source heat pump compressor 11. FIG. 5 shows a conceptual flow of the cold water and the refrigerant at this time.

  Then, it is determined whether or not the room temperature has decreased to the set temperature (step S24). If the room temperature has not decreased to the set temperature (if the determination result in step S24 is No), the cooling operation is continued. (Step S23) When the room temperature drops to the set temperature (Yes in Step S24), the cooling operation (direct expansion / cooling operation) by the water source heat pump is stopped (Step S25), and the cold water is water-to-air. The cooling operation (water / cooling operation) is continuously performed by exchanging heat with air-conditioning air in the heat exchanger 27 (step S26). When the determination in step S22 is No (when the room temperature is lower than the fifth predetermined temperature (set temperature + 2 ° C.)), the water / cooling operation is continuously performed (step S26).

  While the water / cooling operation is being performed, it is determined whether or not the room temperature detected by the suction air temperature sensor 29 has reached the set temperature −1 ° C. set by the indoor remote controller or the like (step S27). When the temperature reaches (set temperature −1 ° C.) (Yes in step S27), the cold / hot water control valve 13 is switched so that the cold water bypasses the water-to-air heat exchanger 27, thereby cooling operation using cold water. Is stopped (water flow to the cold water coil is stopped) (step S28).

  On the other hand, if the determination result in step S19 is No (when the room temperature is lower than the set temperature), the cold / hot water control valve 13 is switched so that the cold water bypasses the water-to-air heat exchanger 27, and the water-to-air Water flow to the heat exchanger 27 is stopped (step S29), and it is determined whether the room temperature is lower than a sixth predetermined temperature (set temperature -2 ° C) (step S30). The setting of the sixth predetermined temperature can be changed, but is generally set to (set temperature -2 ° C).

  Thus, when the room temperature is lower than the sixth predetermined temperature (set temperature -2 ° C) (when the determination result in Step S30 is Yes), a heating operation command is output to the water source heat pump. Then, the direct expansion / heating operation is performed (step S31). That is, the water heat source heat pump starts the operation by setting the four-way valve 12 to the heating mode, and the refrigerant discharged from the water heat source heat pump compressor 11 is cooled with air-conditioning air and heat in the refrigerant-to-air heat exchanger 28. After being exchanged and condensed and adiabatically expanded in the heating capillary tube 18-1, the refrigerant evaporates by exchanging heat with cold water while passing through the water-to-refrigerant heat exchanger 17, and the evaporated refrigerant is compressed for the water heat source heat pump. Returned to machine 11. FIG. 6 shows a conceptual flow of the cold water and the refrigerant at this time.

  During the heating operation, it is determined whether or not the room temperature has risen to the set temperature (step S32). When the room temperature has risen to the set temperature (Yes in step S32), the water heat source supplies cold water. The heating operation (direct expansion / heating operation) by the water heat source heat pump is stopped (step S33). Note that this heating operation is continued until the room temperature rises to the set temperature (No in step S32).

  By the way, when the cooling operation by the cold water is stopped and the heating operation and the cooling operation by the water heat source heat pump are not performed, the air blowing operation is performed.

  Thus, according to the composite air conditioner according to the present invention, the cold / hot water of the heat source water is not necessarily hot water or cold water, and the water heat source heat pump can be operated, which is sufficient when the heat source device fails. If there is medium-temperature circulating water from which the temperature of cold / hot water for air conditioning cannot be obtained, it is possible to air-condition only with a water heat source heat pump.

  According to experiments, the rated water volume is 8.6 L / min. However, 5 L / min. Even if the flow rate of the heat source water decreases, if the operation mode of the heat source device and the air conditioning load are different, that is, if the heat source water is hot water and cooling is required, or the heat source water is cold water and heating is required It has been confirmed that the capacity of the heat pump in this case is equal to or higher than that in the case where the operation mode of the heat source device and the indoor load are the same (up by about 20%).

  The composite air conditioner according to the present invention mainly includes a heat source processing unit that controls a compressor and a heat pump for a water heat source heat pump, and an air conditioning air processing unit that performs air conditioning by exchanging heat mainly with air conditioning air. May be installed separately, and the entire apparatus does not need to be a single structure.

It is a lineblock diagram of the compound type air harmony device concerning the present invention. It is a control flowchart of the composite type air conditioning apparatus which concerns on this invention. It is a figure which shows the conceptual flow of the heat source water and the refrigerant | coolant at the time of the heating operation by the hot water of the composite type air conditioning apparatus which concerns on this invention, and the heating operation operation by a water heat source heat pump. It is a figure which shows the conceptual flow of the heat source water and the refrigerant | coolant at the time of the air_conditionaing | cooling driving | operation operation by the water heat source heat pump in case the heat source water of the composite type air conditioning apparatus which concerns on this invention is warm water. It is a figure which shows the conceptual flow of the heat source water and the refrigerant | coolant at the time of the air_conditionaing | cooling operation by the cold water of the composite air conditioner which concerns on this invention, and the air_conditionaing | cooling operation operation by a water source heat pump. It is a figure which shows the conceptual flow of the heat source water and the refrigerant | coolant at the time of the heating operation driving | operation by the water heat source heat pump in case the heat source water of the composite type air conditioning apparatus which concerns on this invention is cold water. It is an example of the composite air conditioner according to the present invention, and is a diagram showing a case where there is no water amount adjusting thin tube. It is a block diagram of the composite type air conditioning apparatus using the conventional constant pressure valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Compressor for water heat source heat pumps 12 Four-way valve 13 Chilled / warm water control valve 15 Water volume adjustment thin tube 15b Water heat source constant flow valve 16 Refrigerant control check valve 17 Water-to-refrigerant heat exchanger 18-1 Heating capillary tube 18-2 Capillary tube for cooling 19 Water heat source inlet temperature detector 20 Constant pressure valve 21 Air supply fan 27 Water to air heat exchanger 28 Refrigerant to air heat exchanger 29 Suction air temperature sensor

Claims (3)

A combined air conditioner that combines a brine type air conditioner and a water heat source heat pump air conditioner,
Compressor for water heat source heat pump, four-way valve, water-to-refrigerant heat exchanger, adiabatic expansion means for refrigerant, refrigerant-to-air heat exchanger, water volume adjusting capillary, water heat source inlet temperature detector, motor An air supply fan including a water-to-air heat exchanger, a cold / hot water control valve, a drain pan, a suction air temperature sensor, and a control device for controlling the room temperature,
The supply path of the heat source water includes a first path that passes through the water-to-refrigerant heat exchanger via the water amount adjusting thin tube by the cold / hot water control valve, and the water amount control tube that bypasses the water amount adjusting thin tube. A heat source device capable of switching to a second path passing through the refrigerant heat exchanger and a third path passing through the water-to-air heat exchanger by bypassing the water amount adjusting thin tube and the water-to-refrigerant heat exchanger; When the operation mode differs from the air conditioning load, the cold / hot water control valve is switched so that the heat source water passes through the first and second paths.   The composite air conditioner according to claim 1, wherein the water-to-refrigerant heat exchanger is configured by a plate heat exchanger.   The composite air conditioner according to claim 1 or 2, wherein the water amount adjusting narrow tube is constituted by a constant flow valve.

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