JP5087751B2 - Ice storage type cold / hot supply method and apparatus - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention can be applied to an existing ice heat storage type refrigeration apparatus, etc., and operates a hot water supply heat pump using CO ₂ as a heat medium with the heat of condensation of the ice heat storage type refrigeration apparatus as a heat source. TECHNICAL FIELD The present invention relates to an ice storage type cold / hot heat supply method and apparatus for ensuring the amount of hot water stored in a hot water supply heat pump by matching the operation time of the heat pump for use.

  Recently, reduction of energy consumption, mainly heavy oil, has become a challenge due to the prevention of global warming and the sharp rise in crude oil prices. On the other hand, in establishments that process food such as slaughterhouses for livestock, for reasons of hygiene (preventing bacterial growth), cooling water is used to cool the processed food, or the processing chamber is kept below 18 ° C. A cooling facility is provided for cooling. Moreover, warm water is required for sterilization washing and product processing. In semiconductor manufacturing factories and business establishments that require strict temperature, humidity, and air cleanliness management, such as in the process of manufacturing precision equipment, demand for cooling and heating is required regardless of the season. Demand is increasing year by year.

Conventionally, it has been common to have an ice heat storage type refrigeration apparatus and a hot water producing machine as shown in FIG.
In FIG. 4, an ice heat storage type refrigeration apparatus 01 includes a refrigerator 02, an ice heat storage tank 03, and a cooling tower 04. The cold water produced in the ice heat storage tank 03 is sent to a meat processing chamber or the like by a pump 05 and processed. It is used as a cooling heat source for chilled water and for cooling the processing chamber.

  The cooling water that has absorbed the heat of condensation of the refrigerant in the refrigerator 02 is sent to the cooling tower 04. In the cooling tower 04, the cooling water exchanges heat with the outside air supplied by the fan 06, is cooled, and is returned to the refrigerator 02 by the pump 07. In the cooling tower 04, a part of the cooling water evaporates, and the cooling water is cooled by taking heat of evaporation from the other cooling water.

  The hot water production machine 010 creates steam with a steam boiler or a hot water supply boiler 011 and supplies the steam to the hot water production tank 012. Hot water is produced in the hot water production tank 012 using the steam as a heat source, and this hot water is supplied to various hot water supply locations such as a slaughterhouse.

  As described above, the ice heat storage type refrigeration apparatus 01 and the hot water manufacturing machine 010 are operated separately, and the condensation heat of the refrigerator 02 is discarded to the outside. In order to effectively use this heat of condensation and reduce the use of heavy oil, it is conceivable to use the heat of condensation of the refrigerator 02 (heat retained at 30 to 35 ° C. of the cooling water) as a heat source of the hot water producing machine 010.

Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-179985) makes it possible to heat hot water supply by using the condensed exhaust heat of an ice heat storage type refrigeration apparatus equipped with an ice heat storage tank and effectively using nighttime power. A heat pump system is disclosed.
Patent Document 2 (Japanese Patent Application Laid-Open No. 2003-139434) also discloses a system for producing hot water using the condensed exhaust heat of a refrigerator equipped with an ice heat storage tank.

  Thus, by operating the hot water supply system using the condensed heat of the ice storage refrigeration system as the heat source, the thermal efficiency of the entire system can be improved, and the condensation heat of the refrigerator that is difficult to use as it is can be effectively utilized. Since the cooling water temperature of the refrigerator can be reduced, there is an advantage that the COP of the refrigerator can be improved.

JP 2000-179985 A JP 2003-139434 A

  As disclosed in Patent Documents 1 and 2, a system for producing hot water using the condensed exhaust heat of an ice heat storage refrigeration apparatus including an ice heat storage tank is already known. In general, ice storage type refrigeration equipment is operated at night when electric power is surplus to store cold energy.

  Ice heat storage refrigeration systems are often operated during nighttime heat storage discount hours. Also, a heat pump for hot water supply is normally operated during the time period. However, the operation time of the ice heat storage type refrigeration apparatus and the operation time of the hot water production machine do not necessarily coincide. Therefore, in the case of a system that produces hot water using the heat of condensation of an ice storage refrigeration system, there is a problem that when the ice storage refrigeration system is not operating, the hot water manufacturing machine cannot be operated and hot water cannot be manufactured. .

  In addition, since the ice heat storage type refrigeration apparatus generally performs an on / off operation of 0 to 100% during the heat storage operation, the operation time varies depending on the season. For example, even if it takes 10 hours to store heat in summer, only about 3 hours of operation time is required in winter when the amount of heat required for storing ice is reduced.

  In view of the problems of the prior art, the present invention makes it possible to produce hot water at around 90 ° C. and to operate an ice storage refrigerating apparatus when the heat of condensation of the ice storage refrigerating apparatus is used as a heat source for a hot water supply heat pump. The purpose is to enable stable hot water supply throughout the year by adjusting the time regardless of the season, cold districts, etc.

In order to achieve such an object, the ice storage type cold / hot heat supply method of the present invention comprises:
In the ice storage type cold / hot heat supply method in which the condensed waste heat of the ice storage type refrigeration system is used as a heat source of a heat pump for hot water supply,
In the condensing part of the ice storage type refrigerating apparatus, the refrigerant of the ice storage type refrigerating apparatus and the CO ₂ heat medium of the heat pump for hot water supply are directly or indirectly heat-exchanged so that the condensation heat of the refrigerant is absorbed by the CO ₂ heat medium. ,
The ice heat storage tank of the ice heat storage refrigeration apparatus detects the ice thickness, and the ice heat storage tank does not become full until the temperature of the hot water manufactured by the hot water supply heat pump and stored in the hot water storage tank reaches a set range. Thus, the freezing speed of the cold water (or brine) in the ice heat storage tank is controlled.

Since the cooling water of the ice heat storage type refrigerating apparatus is generally often 40 ° C. or less, it cannot be used for heat sterilization (about 70 to 90 ° C.), which is the most used for hot water supply, in this temperature range. In the method of the present invention, since the heat pump for hot water supply using the CO ₂ heat medium is operated using the condensation heat of the ice heat storage type refrigeration apparatus, high-temperature water around 90 ° C. can be produced. Such high-temperature water can be widely used for various applications.

Since CO ₂ reaches a critical point at a low temperature, the refrigeration cycle constitutes a cycle including a supercritical region exceeding the critical point. Accordingly, sensible heat exchange is performed without condensing even if the temperature is lowered due to heat deprivation, and it is easy to transition to turbulent flow at a low flow rate, and good heat transfer performance can be obtained. Therefore, water can be heated to a high temperature.

  The ice storage refrigeration system normally has a heat storage operation time set by a timer. When the timer setting time is reached, the heat storage operation starts, and when the ice storage tank is full of ice, the ice thickness sensor detects it and operates. The on / off operation is stopped. However, during the cold season, ice formation in the ice heat storage tank is accelerated, and the ice heat storage operation time is shortened. As a result, sufficient hot water supply operation time cannot be secured, and hot water supply may be insufficient.

  Therefore, in the method of the present invention, the ice thickness in the ice heat storage tank is detected, and the ice heat storage tank is not in a full ice state until the amount of hot water stored in the hot water supply heat pump or the temperature reaches the set range. The freezing speed of cold water (or brine) in the ice heat storage tank is controlled. Thereby, the operation time of the heat pump for hot water supply can be secured, and the amount of hot water can be secured.

In the method of the present invention, if the ice heat storage tank becomes full before the temperature of the hot water in the hot water tank reaches the set range, the operation of the ice heat storage refrigeration system is stopped and the outside heat is transferred to the CO ₂ heat medium. It is better to operate the heat pump for hot water supply by absorbing it. As a specific means, the CO ₂ heat medium of the heat pump for hot water supply or the heat source medium (water or brine) exchanged with the CO ₂ heat medium is led to a heating tower that also serves as a cooling tower, and the outside air is fed by a fan there. The heat of the outside air is absorbed in the CO ₂ heating medium or brine. Thereby, even after the operation of the ice heat storage type refrigeration apparatus is stopped, the operation of the hot water supply heat pump can be continued.

Moreover, the ice storage type cold / hot supply apparatus of the present invention for carrying out the method of the present invention comprises:
In the ice storage type cold / hot heat supply device that uses the condensed exhaust heat of the ice storage type refrigeration device as a heat source of the heat pump for hot water supply,
A heat exchanger that directly or indirectly heat-exchanges the refrigerant of the ice heat storage refrigeration system and the CO ₂ heat medium of the hot water supply heat pump, and absorbs the condensation heat of the refrigerant in the CO ₂ heat medium;
A sensor for detecting the ice thickness in the ice heat storage tank of the ice heat storage type refrigeration apparatus;
The detection value of the ice thickness sensor is input to calculate the icing speed, so that the temperature of the hot water produced in the hot water supply heat pump and stored in the hot water storage tank does not become full until the temperature of the hot water reaches the set range. And a control device for controlling the freezing speed of the cold water in the ice heat storage tank.

In the device of the present invention, a sensor for detecting the ice thickness in the ice heat storage tank is provided, and the control device calculates the icing speed from the detection value of the ice thickness sensor. And the temperature of the hot water manufactured by the heat pump for hot water supply and stored in the hot water storage tank is monitored, and the ice heat storage refrigeration apparatus is used so that the ice heat storage tank does not become full until the temperature of the stored hot water reaches the set range. Try to control the speed of freezing.
Thus, the operation of the hot water supply heat pump can be continued until the hot water storage amount or temperature falls within the set range.

  In the device of the present invention, the ice thickness sensor is provided at a set position in the ice heat storage tank, and is used as a sensor for detecting the presence or absence of icing at the position, and the detection result of the ice thickness detection sensor is input to the control device, The control device may be configured to calculate the icing speed of cold water (or brine) in the ice heat storage tank from the detection result and the operation time of the ice heat storage type refrigeration apparatus. Thereby, the freezing speed of the cold water in the ice heat storage tank can be obtained with a simple and low-cost configuration.

  In the apparatus of the present invention, a sensor for detecting the temperature of the cold water in the ice storage tank is provided, and the detection value of the water temperature sensor is input to the control device, and the control device calculates the water temperature falling gradient in the ice storage tank. In addition, the icing speed of the cold water in the ice heat storage tank may be calculated from the water temperature descending gradient. As a result, the icing speed can be obtained even before the cold water in the ice heat storage tank freezes.

  Furthermore, it is preferable to combine this configuration with the configuration related to the ice thickness sensor. Thereby, even before the cold water or the like in the ice heat storage tank freezes or after freezing, the freezing speed can be obtained easily and at low cost.

According to the method of the present invention, in the ice storage type cold / high temperature supply method in which the condensed waste heat of the ice storage type refrigeration apparatus is used as a heat source of the hot water supply heat pump, the ice storage type refrigeration is performed in the condensing part of the ice storage type refrigeration apparatus. The refrigerant of the machine and the CO ₂ heat medium of the heat pump for hot water supply are directly or indirectly heat-exchanged so that the heat of condensation of the refrigerant is absorbed by the CO ₂ heat medium, and the ice heat storage refrigeration unit in the ice heat storage tank Ice temperature is detected, and ice water such as cold water in the ice storage tank is frozen until the temperature of the hot water manufactured by the heat pump for hot water supply and stored in the hot water tank reaches the set range. By controlling the speed, the amount of energy used such as heavy oil can be reduced, the thermal efficiency of the entire system can be improved, and high-temperature hot water of about 90 ° C. having a wide application range can be supplied.

  In addition, by controlling the icing speed of cold water or the like in the ice heat storage tank, the operation of the heat pump for hot water supply can be stabilized, and hot water can be supplied constantly and stably regardless of the season or cold district.

Further, according to the present invention device, in the ice storage type cold / hot heat supply device that uses the condensed exhaust heat of the ice storage type refrigeration device as a heat source of the hot water supply heat pump, the refrigerant of the ice storage type refrigeration device and the heat pump for hot water supply a CO ₂ heat medium directly or indirectly by heat exchange with a heat exchanger to absorb heat of condensation of the refrigerant in the CO ₂ heat medium, an ice thickness of the ice thermal storage tank in ice thermal storage type cooling unit The ice storage tank calculates the icing speed by inputting the detection value of the ice thickness sensor and the temperature of the hot water manufactured by the hot water supply heat pump and stored in the hot water storage tank is within a set range. By providing a control device that controls the icing speed of cold water or the like in the ice heat storage tank so as not to be in a full ice state, it is possible to obtain the same effect as the method of the present invention.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of an ice regenerative cold / hot supply device 1 according to the present embodiment installed in a food processing plant.
In FIG. 1, an ice storage type cold / hot supply apparatus 1 is a combination of an ice storage type refrigeration apparatus 10 and a hot water producing machine 20. The ice heat storage type refrigeration apparatus 10 includes a refrigerator 11, an ice heat storage tank 12, and a cooling tower 13. Below the cooling water surface of the ice heat storage tank 12, a circulation line 14 through which the refrigerant (for example, NH ₃ ) of the ice heat storage type refrigerator 11 or the brine cooled by exchanging heat with the refrigerant is disposed. .

  As the refrigerant in the refrigerator 11 or the brine cooled by exchanging heat with the refrigerant circulates in the circulation line 14, the cold water c1 stored in the ice heat storage tank 12 is cooled and freezes. The cold water c1 is supplied by the pump 15 through the pipe line 16 as processing cold water or a cooling heat source for cooling the processing chamber.

  The cooling water c2 that exchanges heat with the refrigerant of the refrigerator 11 and absorbs the heat of condensation of the refrigerant is supplied to the cooling tower 13 through a circulation line 17 in which a pump 18 is interposed. In the cooling tower 13, the cooling water c <b> 2 exchanges heat with a heat source medium b supplied from a hot water supply heat pump 21, which will be described later, and the retained heat is absorbed by the heat source medium b and cooled. In the cooling tower 13, the outside air is brought into contact with the cooling water c2 directly or indirectly. The cooling tower 13 is provided with a fan 19 for supplying outside air to the heat exchange section between the cooling water c2 and the heat source medium b, and a chemical injection / cleaning equipment 28. From the chemical injection / cleaning equipment 29, In order to prevent the generation of harmful bacteria and prevent the components in the cooling water from depositing and adhering, chemicals are injected or a cleaning liquid is injected during the cleaning process.

The hot water supply heat pump 21 uses a CO ₂ heat medium, and includes a gas cooler 21a and a heat exchanger 21b. The heat source medium b that has absorbed the condensed exhaust heat of the refrigeration apparatus 10 from the cooling water c2 in the cooling tower 13 exchanges heat with the CO ₂ heat medium in the heat exchanger 21b, and heats the CO ₂ heat medium.
The CO ₂ heat medium becomes a high pressure in the gas cooler 21a for producing hot water and is in a supercritical state of 32 ° C. or higher. In the heat exchanger 21b, the CO ₂ heat medium evaporates at 31 ° C. or less, becomes superheated gas, and is sucked into the CO ₂ compressor.

Accordingly, the heat medium b is cooled by cooling water c2 in the cooling tower 13 and 30 to 32 ° C., the heat source medium b the CO ₂ heat medium in the evaporating section of the CO ₂ heat medium becomes (low pressure section) heat exchanger 21b Heat exchange with the CO ₂ heating medium at 31 ° C. or lower. As a result, it is possible to stably obtain high-temperature water by suppressing the pressure fluctuation of the CO ₂ heat medium with the gas cooler 21a serving as the high-pressure portion.

  The gas cooler 21 a of the hot water supply heat pump 21 and the hot water storage tank 22 are connected by a hot water circulation line 23. The hot water circulation line 23 is supplied with water supply h0. The water supply h0 is heated by the gas cooler 21a to become high-temperature water h1. Although the hot water h1 is stored in the hot water storage tank 22, it is circulated to the gas cooler 21a via the pump 24 and reheated, and is kept within a set temperature, for example, in the range of 65 to 90 ° C. And it supplies to various hot-water supply places, such as a slaughterhouse, from the pipe line 25 with the pump 26 interposed in the pipe line 25. FIG.

  In the ice heat storage tank 12, an ice thickness sensor 31 is installed at a position set below the surface of the cold water c1. The cold water c1 begins to freeze from the outer surface of the circulation pipeline 14, and the icing gradually grows on the outer surface of the circulation pipeline 14 with increasing thickness in a cylindrical shape. Therefore, the icing speed of the cold water c1 is calculated from the operation start time of the refrigeration apparatus 10, the distance between the surface of the circulation pipe 14 and the installation position of the ice thickness sensor 31, and the icing detection time of the ice thickness sensor 31. Can do.

One ice thickness sensor 31 may be used, but ideally, two or more ice thickness sensors may be installed at different positions. Further, in the ice heat storage tank 12, a water temperature sensor 32 for separately detecting the water temperature of the cold water c1 is provided. Detection values of the ice thickness sensor 31 and the water temperature sensor 32 are input to the input unit 34 of the control device 33. The controller 33 is provided on the hot water supply heat pump 21 side.
Thus, in this embodiment, it is possible to modify the existing ice heat storage refrigeration apparatus 10 by incorporating the hot water producing machine 20.

  The control device 33 includes an input unit 34 that inputs detection values of the ice thickness sensor 31 and the water temperature sensor 32, a calculation unit 35 that calculates an icing speed from the detection values of these sensors, and a hot water storage amount of the high-temperature water h1 in the hot water tank 22. And an output unit 36 that issues a control signal for controlling the refrigeration load capacity of the refrigeration apparatus 10 to the refrigerator 11 so that the ice heat storage tank 12 does not become full until the temperature reaches the set range.

  In this embodiment having such a configuration, the ice heat storage tank 12 is gradually cooled by circulating the refrigerant of the refrigerator 11 or the brine cooled by the refrigerant through the circulation line 14. Then, icing starts from the outer surface of the circulation line 14, and the icing gradually spreads around the circulation line 14. The water temperature of the cold water c <b> 1 is detected by the water temperature sensor 32, and the detected value is input to the control device 33. The water temperature of the cold water c1 in the ice heat storage tank 12 is finally −5 to −10 ° C., for example.

In the pipe line 17, the cooling water c <b> 2 that exchanges heat with the refrigerant of the refrigerator 11 and absorbs the heat of condensation of the refrigerant is circulated to the cooling tower 13. The water temperature of the cooling water c2 is, for example, 30 to 35 ° C. On the other hand, the heat source medium b from which the evaporation heat has been removed from the CO ₂ heat medium by the gas cooler 21 a of the hot water supply heat pump 21 is supplied to the cooling tower 13 by the pump 28 via the circulation line 27. Then, in the cooling tower 13, the cooling water c2 and the heat source medium b exchange heat, and the heat source medium b absorbs the retained heat of the cooling water c2.

The heat source medium b returned to the hot water supply heat pump 21 exchanges heat with the CO ₂ heat medium by the hot water supply heat pump 21, and the CO ₂ heat medium removes the heat of evaporation. The hot water h1 stored in the hot water storage tank 22 is supplied to the hot water supply heat pump 21 by the pump 24 through the circulation pipe 23, where the heat of condensation of the CO ₂ heat medium is absorbed and heated. The temperature of the hot water h1 in the hot water tank 22 is set to be in the range of 65 to 90 ° C., for example.

  In the ice heat storage tank 12, the detected value of the water temperature sensor 32 is input to the input unit 34 of the control device 33. When the cooling water c1 freezes gradually and reaches the ice thickness sensor 31, the ice thickness sensor 31 detects the icing state and inputs the detection information to the input unit. The calculation unit 35 of the control device 33 calculates the icing speed from the detection value input from the water temperature sensor 32 and the detection information input from the ice thickness sensor 31.

  First, the water temperature descending gradient in the ice heat storage tank 12 is calculated. FIG. 3 is a water temperature-time diagram in which the vertical axis represents the water temperature of the cold water c1 and the horizontal axis represents the operating time of the ice heat storage type refrigeration apparatus 10. In FIG. 3, the controller 33 calculates the water temperature descending gradient a <b> 1 from the detection value input from the water temperature sensor 32. In FIG. 3, a line i indicates a line where the cooling water c <b> 1 in the ice heat storage tank 12 is in a full ice state.

  In the winter, the amount of heat required for the ice storage type refrigeration apparatus 10 decreases. Therefore, the water temperature falling gradient tends to be steep. Estimating from the water temperature descending gradient a1 calculated by the control device 33, the ice heat storage tank 12 may become full before the amount and temperature of the hot water h1 in the hot water tank 22 reach the set range. If there is, the operation of the ice heat storage type refrigerator 11 is subjected to capacity control or rotation speed control to be a partial load operation. Thus, the water temperature descending gradient is changed to a gentle gradient a2.

  When icing in the ice storage tank 12 has progressed, the ice thickness sensor 31 detects the presence or absence of icing, and the detected value is input to the input unit 34. In the control device 33, the calculation unit 35 calculates the icing speed from the time from the start of the operation of the ice regenerative refrigeration apparatus 10 to the detection of icing by the ice thickness sensor 31. FIG. 2 is an ice thickness-time diagram in which the vertical axis represents the ice thickness in the ice heat storage tank 12 and the horizontal axis represents the operation time of the ice heat storage refrigeration apparatus 10. In addition, in FIG. 2, the line i shows the line from which the cooling water c1 in the ice thermal storage tank 12 will be in a full ice state.

  In FIG. 2, it is estimated that the inside of the ice heat storage tank 12 becomes full before the hot water h1 in the hot water tank 22 reaches the set amount and the set temperature, estimated from the ice speed d1 thus calculated. In this case, the operation of the ice heat storage type refrigeration apparatus 10 is subjected to capacity control or rotation speed control to be a partial load operation. In this way, the icing speed gradient is changed to a gentle gradient d2.

  By such an operation, until the freezing in the ice heat storage tank 12 starts, the freezing speed is calculated from the detection value of the water temperature sensor 32, and thereafter, the freezing speed is calculated from the detection information of the ice thickness sensor 31. Since the ice heat storage type refrigeration apparatus 10 is partially loaded to control the icing speed, the hot water supply heat pump is used until the hot water storage amount and temperature of the hot water h1 in the hot water tank 22 fall within the set range. 21 can continue to operate. In this way, by adjusting the operating time of the ice storage type cold / hot heat supply device 1, it is possible to supply stable high-temperature water h1 throughout the year regardless of the season, cold district, and the like.

  In this embodiment, both the ice thickness sensor 31 and the water temperature sensor 32 are installed, but the present invention can be implemented even if only the ice thickness sensor 31 is installed.

  If the amount of hot water stored in the hot water tank 22 and the temperature of the hot water h1 are within the set range and the ice heat storage tank 12 becomes full of ice, the cooling water c2 is circulated through the circulation line 17. Stop circulating. Then, the fan 19 is operated to exchange heat between the heat source medium b and the outside air so that the heat source medium b absorbs the outside air heat. That is, the cooling tower 13 is caused to function as a heating tower. In this way, the heat source medium b absorbs outside air heat so as to ensure the amount of heat necessary for manufacturing the high-temperature water h1.

  In addition, when the amount and temperature of the hot water h1 in the hot water storage tank 22 are within the set range before the ice heat storage tank 12 is filled with ice, the heat source medium b is circulated through the circulation pipe 27. Stop making it happen. And in the cooling tower 13, as demonstrated based on FIG. 4, the fan 19 is operated and the cooling water c2 is cooled with external air.

According to the present embodiment, the condensation heat of the ice heat storage refrigeration apparatus 10 is used as a heat source for the hot water supply heat pump 21, so that no steam or hot water boiler is required, and the heavy oil serving as the fuel for the boiler is used. Consumption can be reduced.
Further, by using a CO ₂ heating medium for the hot water supply heat pump 21, it becomes possible to supply high-temperature water at around 90 ° C. For example, in a slaughterhouse, the high-temperature water is used as hot water for washing carcass, It can be widely used for hot water for tweezers and other applications.

Further, as described above, the amount of hot water stored in the range set by the hot water supply heat pump 21 can be adjusted throughout the year regardless of the season, cold district, etc. by adjusting the water temperature descending gradient and the freezing speed in the ice heat storage tank 12. The high-temperature water h1 having a high temperature can be stably supplied.
Furthermore, even if the inside of the ice heat storage tank 12 becomes full before the hot water having the set amount of hot water and the temperature is obtained, the cooling tower 13 serves as a heat source for the hot water supply heat pump 21. Since heat can be used, it does not interfere with securing hot water.

  Further, since the existing ice heat storage type refrigeration apparatus 10 is not required to be remodeled and only the hot water supply heat pump 21 is incorporated, the remodeling work is facilitated.

  According to the present invention, as a multifunctional system that can supply cold and hot heat simultaneously, it can be widely applied not only to slaughterhouses but also to facilities that require cold and hot heat, increasing the thermal efficiency of the entire system, High-temperature water can be supplied, and stable hot water can be supplied throughout the year regardless of the season or cold climate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the ice thermal storage type cold / hot supply apparatus which concerns on one Embodiment of this invention. It is an ice thickness-time diagram which concerns on the said embodiment. It is a water temperature-time diagram which concerns on the said embodiment. (A) It is a whole block diagram of the conventional ice thermal storage refrigerating system, (b) is a systematic diagram of the conventional warm water manufacturing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice storage type cold / hot supply apparatus 10 Ice storage type freezing apparatus 11 Refrigerator 12 Ice thermal storage tank 13 Cooling tower (heat exchanger)
20 Hot water production machine 21 Heat pump for hot water supply 22 Hot water storage tank 31 Ice thickness sensor 32 Water temperature sensor 33 Controller a1, a2 Water temperature descending gradient b Heat source medium c1 Cold water c2 Cooling water d1, d2 Freezing speed i Full ice line

Claims (5)

In the ice storage type cold / hot heat supply method in which the condensed waste heat of the ice storage type refrigeration system is used as a heat source of a heat pump for hot water supply,
In the condensing part of the ice storage type refrigerating apparatus, the refrigerant of the ice storage type refrigerating apparatus and the CO ₂ heat medium of the heat pump for hot water supply are directly or indirectly heat-exchanged so that the condensation heat of the refrigerant is absorbed by the CO ₂ heat medium. ,
The ice heat storage tank of the ice heat storage refrigeration apparatus detects the ice thickness, and the ice heat storage tank does not become full until the temperature of the hot water manufactured by the hot water supply heat pump and stored in the hot water storage tank reaches a set range. Thus, the ice storage-type cold / hot supply method characterized by controlling the freezing speed of the cold water in an ice thermal storage tank. If the ice heat storage tank becomes full before the temperature of the hot water in the hot water tank reaches the set range, stop the operation of the ice heat storage refrigeration system and absorb the outside air heat into the CO ₂ heat medium to supply hot water The ice heat storage type cold / hot supply method according to claim 1, wherein the heat pump is operated. In the ice storage type cold / hot heat supply device that uses the condensed exhaust heat of the ice storage type refrigeration device as a heat source of the heat pump for hot water supply,
A heat exchanger that directly or indirectly heat-exchanges the refrigerant of the ice heat storage refrigeration system and the CO ₂ heat medium of the hot water supply heat pump, and absorbs the condensation heat of the refrigerant in the CO ₂ heat medium;
A sensor for detecting the ice thickness in the ice heat storage tank of the ice heat storage type refrigeration apparatus;
The detection value of the ice thickness sensor is input to calculate the icing speed, so that the temperature of the hot water produced in the hot water supply heat pump and stored in the hot water storage tank does not become full until the temperature of the hot water reaches the set range. And a controller for controlling the freezing speed of the cold water in the ice heat storage tank.   The ice thickness sensor is provided at a set position in the ice heat storage tank and detects the presence or absence of icing at the position. The detection result of the ice thickness sensor is input to the control device, and the control device 4. The ice storage type cold / hot supply apparatus according to claim 3, wherein the ice storage speed of the cold water in the ice storage tank is calculated from the detection result and the operation time of the ice storage type freezer.   A sensor for detecting the water temperature of the cold water in the ice heat storage tank is provided, and the detected value of the water temperature sensor is input to the control device, and the water temperature decrease gradient in the ice heat storage tank is calculated by the control device, and the water temperature decrease gradient 5. The ice storage type cold / hot supply apparatus according to claim 3, wherein the ice storage speed of the cold water in the ice storage tank is calculated.

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