JP6613404B2 - Refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration system including an adsorption refrigeration cycle for supercooling a main refrigerant of a main refrigeration cycle.

  Patent Document 1 discloses a refrigeration system in which a refrigeration capacity is improved by supercooling a main refrigerant of a main refrigeration cycle using an adsorption refrigeration cycle.

  The adsorption refrigeration cycle includes an adsorbing unit including an adsorbent that adsorbs adsorbed refrigerant by being cooled and desorbed adsorbed refrigerant by being heated, and a refrigerant desorption mode in which the adsorbent desorbs the adsorbed refrigerant. In the condensing unit for condensing the adsorbed adsorbed refrigerant and the refrigerant adsorbing mode in which the adsorbent adsorbs the adsorbed refrigerant, the adsorbed refrigerant condensed by the condensing unit is evaporated and supplied to the adsorbing unit Part.

  Since the adsorption section of the adsorption refrigeration cycle repeats the adsorption and desorption of the adsorbed refrigerant alternately, normally, by providing two sets of adsorbing sections and switching them alternately, the evaporation of the adsorbed refrigerant in the evaporation section is continuous. To be done. However, providing two sets of adsorption parts increases the size of the refrigeration apparatus. Therefore, in the technique described in Patent Document 1, only one set of adsorption units is used, and in the refrigerant desorption mode, the main refrigerant of the main refrigeration cycle is supercooled with cooling water for cooling the condensing unit.

JP2013-096586A

However, the technique described in Patent Document 1 cools the secondary medium (cooling water) with cold heat generated in the evaporation section of the adsorption refrigeration cycle, and supercools the main refrigerant of the main refrigerant cycle with this secondary medium. Since it is a structure, the loss through the secondary medium occurred and the efficiency was poor.

  The technique described in Patent Document 1 is for vehicles, and the heat source for realizing the refrigerant desorption mode is the exhaust heat of the engine, and is unnecessary in the refrigerant adsorption mode. Good. However, in the case of stationary use, particularly in the case of a cogeneration system or the like, the purpose is to increase the total energy efficiency of power generation and exhaust heat, so it is problematic to dissipate heat to the outside air.

  This invention makes it a subject to provide the stationary refrigeration cycle which can supercool the main refrigerant | coolant of a main refrigeration cycle more efficiently in view of such a conventional problem.

In order to solve the above problems, a refrigeration system according to the present invention includes:
An adsorbing portion comprising an adsorbent that adsorbs the adsorbing refrigerant by being cooled and desorbing the adsorbing refrigerant by being heated;
A condensing part for condensing the adsorbed adsorbed refrigerant in a refrigerant desorption mode in which the adsorbent desorbs the adsorbed refrigerant;
An evaporating unit that evaporates the adsorbed refrigerant condensed by the condensing unit and supplies it to the adsorbing unit in a refrigerant adsorption mode in which the adsorbent adsorbs the adsorbed refrigerant;
A heat storage unit that stores heat in the heating medium in the refrigerant adsorption mode, and a heat source capable of supplying the heating medium from the heat storage unit to the adsorption unit in the refrigerant desorption mode;
A cooler capable of supplying a cooling medium to the adsorption unit in the refrigerant adsorption mode and capable of supplying a cooling medium to the condensing unit in the refrigerant desorption mode;
A first supercooling heat exchanger capable of supercooling the main refrigerant by exchanging heat between the main refrigerant and the adsorbed refrigerant that is incorporated in the main refrigeration cycle and evaporates in the evaporator in the refrigerant adsorption mode;
A second subcooling heat exchange that can be supercooled by at least a part of the cooling medium incorporated in the main refrigeration cycle and supplied from the cooler in the refrigerant desorption mode with the main refrigerant. and the vessel,
It is comprised including.

According to the present invention, two subcooling heat exchangers are incorporated in the main refrigeration cycle, and in the refrigerant adsorption mode, heat exchange is performed between the adsorbed refrigerant evaporated in the evaporating unit and the main refrigerant, and in the refrigerant desorption mode, Heat exchange is performed between the cooling medium from the cooler and the main refrigerant. Therefore, energy loss can be reduced without using a secondary medium.
Further, according to the present invention, the heat source capable of supplying the heating medium to the adsorption unit has a heat storage unit, and heat is stored in the heating medium in the refrigerant adsorption mode. It is possible to improve energy efficiency.

1 is a circuit diagram of a refrigeration system showing an embodiment of the present invention. Explanatory drawing of the refrigerant | coolant adsorption mode in embodiment of FIG. Explanatory drawing of the refrigerant | coolant desorption mode in embodiment of FIG. Circuit diagram of a refrigeration system showing another embodiment Explanatory drawing of the operation stop mode of the freezing apparatus in embodiment of FIG.

Hereinafter, embodiments of the present invention will be described in detail.
The refrigeration system according to the present invention is a stationary refrigeration system for refrigeration and freezing of indoor air conditioners and foods in a warehouse, and separate from the main refrigeration cycle (vapor compression refrigeration system), an adsorption refrigeration cycle (adsorption) Type refrigeration equipment). The adsorption refrigeration cycle is used for supercooling the main refrigerant of the main refrigeration cycle, and improves the refrigeration capacity of the main refrigeration cycle.

  The vapor compression refrigeration apparatus 1 constituting the main refrigeration cycle performs the indoor cooling and refrigeration / freezing of food in the refrigerator by the evaporating action of the main refrigerant circulating in the circuit. The compressor 2, the condenser 3. An expansion valve 4 serving as a decompression unit and an evaporator 5 are included.

The compressor 2 compresses the main refrigerant of low pressure and low temperature gas to obtain the main refrigerant of high pressure and high temperature gas. As the power source, a power generation device 21 described later can be used.
The condenser 3 uses the fan 3a, cools the main refrigerant of high-pressure and high-temperature gas from the compressor 2 to the condensation point with outdoor air, and reduces it to the main refrigerant of high-pressure and normal-temperature liquid.
The expansion valve 4 rapidly decompresses and expands the high-pressure and normal-temperature liquid main refrigerant from the condenser 3 to obtain a low-pressure and low-temperature liquid (mist-like) main refrigerant.
The evaporator 5 is disposed in the air blowing path (between the suction port and the blowout port) by the fan 5a, and evaporates the main refrigerant of the low-pressure low-temperature liquid from the expansion valve 4 while taking heat from the surroundings. Thereby, air for cooling or refrigeration / freezing is cooled.

  Here, the main refrigerant is supercooled by using the adsorption refrigeration apparatus 10 constituting the adsorption refrigeration cycle at the subsequent stage of the condenser 3 in the vapor compression refrigeration apparatus 1 (between the condenser 3 and the expansion valve 4). First and second supercooling heat exchangers 7 and 8 are arranged.

  The first subcooling heat exchanger 7 has a heat exchange passage 7a interposed in series in the circulation circuit of the vapor compression refrigeration apparatus 1, and the main refrigerant flowing through the heat exchange passage 7a is used as described later. In the refrigerant adsorption mode of the adsorption refrigeration apparatus 10, the refrigerant is supercooled by heat exchange with the adsorbed refrigerant in the evaporator 13.

  The second subcooling heat exchanger 8 has a heat exchange passage 8a interposed in series in the circulation circuit of the vapor compression refrigeration apparatus 1, and the main refrigerant flowing through the heat exchange passage 8a is used as described later. Then, in the refrigerant desorption mode of the adsorption refrigeration apparatus 10, supercooling is performed by heat exchange with the cooling water for cooling the condenser 12. That is, the second subcooling heat exchanger 8 has a heat exchange passage 8a through which the main refrigerant of the vapor compression refrigeration apparatus 1 flows and a heat exchange passage 8b through which cooling water can flow, which are thermally Is in contact with

  The main refrigerant on the outlet side of the condenser 3 of the vapor compression refrigeration apparatus 1 is further cooled by the first or second supercooling heat exchangers 7 and 8 as compared with the case of the condenser 3 alone, thereby evaporating. Since the enthalpy and dryness of the main refrigerant on the inlet side of the vessel 5 can be lowered, the refrigeration capacity can be improved. As a result, since the discharge capacity of the compressor 2 can be reduced, the power consumption of the compressor 2 can be reduced and the energy saving performance can be improved.

The adsorption refrigeration apparatus 10 constituting the adsorption refrigeration cycle includes an adsorption unit 11, a condensing unit 12, and an evaporation unit 13.
These are arranged in the order of the evaporation unit 13, the adsorption unit 11, and the condensation unit 12 from the bottom (low level) to the top (high level). The evaporating unit 13 and the adsorbing unit 11 are connected by piping via a one-way valve 14 that allows only the flow from the evaporating unit 13 side to the adsorbing unit 11 side. The adsorbing unit 11 and the condensing unit 12 are pipe-connected via a one-way valve 15 that allows only a flow from the adsorbing unit 11 side to the condensing unit 12 side. The condensing unit 12 and the evaporating unit 13 are connected via a pump 16 from the condensing unit 12 side to the evaporating unit 13 side.
Accordingly, these constitute a closed circuit of the evaporation unit 13 → the adsorption unit 11 → the condensing unit 12 → the evaporation unit 13. And in this closed circuit, water (steam) as an adsorption refrigerant is enclosed under vacuum.
Instead of the one-way valve 14, an open / close valve that opens in the refrigerant adsorption mode may be provided. Further, instead of the one-way valve 15, an on-off valve that opens in the refrigerant desorption mode may be provided.

The adsorption unit 11 includes an adsorbent that adsorbs the adsorbed refrigerant when cooled and desorbs the adsorbed refrigerant when heated. The adsorption unit 11 is configured in detail as follows.
The adsorption unit 11 includes a fin-and-tube heat exchanger therein. That is, the tube 11a which penetrates the adsorption | suction part 11 and the many fins 11b attached to the outer surface of the tube 11a in the adsorption | suction part 11 are provided. An adsorbent (water adsorbent such as zeolite or silica gel) is bonded to the surface of the fin 11b.

The adsorbent has the property that the amount of adsorbable refrigerant (adsorption capacity) increases as the relative humidity of the atmosphere in which the adsorbent is stored increases.
For this reason, when the adsorbent (fin 11b with adsorbent) is heated, the relative humidity in the vicinity of the surface of the adsorbent decreases and the adsorption capacity decreases, so that the adsorbed refrigerant is desorbed and released. . On the other hand, when the adsorbent (fin 11b with adsorbent) is cooled, the relative humidity in the vicinity of the surface of the adsorbent increases and the adsorption capacity increases. Therefore, the refrigerant is adsorbed by the increase. The adsorbent generates heat of adsorption larger than the heat of condensation of the refrigerant when adsorbing the vapor refrigerant.

  In order to heat or cool the adsorbent, the hot water as the heating medium or the cooling water (relatively low temperature water) as the cooling medium is selectively circulated through the tube 11a in the adsorption unit 11. The adsorbent can be heated by circulating hot water through the tube 11a, and the adsorbent can be cooled by circulating cooling water through the tube 11a.

The condensing unit 12 condenses the adsorbed adsorbed refrigerant in the refrigerant desorption mode in which the adsorbent desorbs the adsorbed refrigerant in the adsorbing unit 11. The condensing part 12 is comprised in detail as follows.
The condensing unit 12 includes therein a heat exchange passage 12a through which cooling water can flow. As a result, the vapor refrigerant that has been desorbed and released from the adsorbent by the adsorbing unit 11 and has flowed into the condensing unit 12 can be cooled and condensed into a liquid.

The evaporation unit 13 evaporates the adsorbed refrigerant condensed by the condensing unit 12 and supplies it to the adsorbing unit 11 in the refrigerant adsorption mode in which the adsorbent adsorbs the adsorbed refrigerant in the adsorbing unit 11. In detail, the evaporation part 13 is comprised as follows.
The evaporation unit 13 functions as the first subcooling heat exchanger 7, and a heat exchange passage 7 a through which the main refrigerant of the vapor compression refrigeration apparatus 1 flows passes through the evaporation unit 13.
The evaporation unit 13 stores water as an adsorbed refrigerant inside (bottom) thereof. The heat exchange passage 7a is disposed above the water surface. And the refrigerant | coolant distribution pipe | tube 17 is arrange | positioned above the heat exchange channel | path 7a in the evaporation part 13. FIG.

Here, the liquid refrigerant return passage 18 from the bottom of the condenser 12 and the liquid refrigerant take-out passage 19 from the bottom of the evaporator 13 are joined together and connected to the suction port of the pump 16. The discharge side of the pump 16 is connected to the refrigerant distribution tube 17 in the evaporator 13. The refrigerant distribution tube 17 is formed by forming a plurality of small holes on the lower surface of a horizontally disposed tube body, and can pour liquid refrigerant onto the constituent body of the heat exchange passage 7a. Thereby, the evaporation unit 13 constitutes a so-called “falling liquid film type” evaporator.
The heat exchange passage 7a may be provided under the liquid level and submerged. In this case, the pump 16 becomes unnecessary. However, since the water head pressure is generated, the evaporation temperature becomes high.

Next, heating means and cooling means of the adsorption unit 11 will be described.
As a heat source of the heating means, a power generation device 21 such as a fuel cell or a gas turbine generator is used. And in order to collect | recover the heat which generate | occur | produces with electric power generation from the electric power generating apparatus 21, the hot water storage tank 22 is provided as a heat storage part.
A heat recovery circuit 24 including a circulation pump 23 is formed between the heat generation unit (power generation unit or exhaust passage) of the power generation device 21 and the hot water storage tank 22.
The heat recovery circuit 24 takes out a relatively low temperature hot water from the bottom of the hot water storage tank 22 by the circulation pump 23 and sends it to the heat generation part of the power generation device 21 to recover the heat. The hot water having a high temperature due to the heat recovery is returned to the upper part of the hot water storage tank 22 and stored.

Since the hot water in the hot water storage tank 22 is used as the heating means, a hot water circuit 26 including the hot water pump 25 is formed.
The hot water circuit 26 is a series circuit of the hot water pump 25 and the hot water storage tank 22. The hot water is taken out from the upper part of the hot water storage tank 22 and used for heating. The hot water used for heating is supplied to the bottom of the hot water storage tank 22 by the hot water pump 25. return.

An air-cooled cooler 27 is used as the cooling means. The cooler 27 uses a fan 27a to cool the flowing water. In addition to the hermetic cooler, an open cooler, a so-called cooling tower may be used. In the case of the cooling tower, since the cooling water evaporates to the outside air, a lower temperature can be created.
Since cooling water from the cooler 27 is used as cooling means, a cooling water circuit 29 including a cooling water pump 28 is formed.
The cooling water circuit 29 is a series circuit of a cooler 27 and a cooling water pump 28, and the cooling water from the cooler 27 is sucked and discharged by the cooling water pump 28, is used for cooling, and the cooling water used for cooling is cooled. Return to vessel 27.

  The heating / cooling tube 11a of the adsorption unit 11 is selectively connected to the hot water circuit 26 or the cooling water circuit 29 via the three-way switching valves 31 and 32 for heating / cooling the adsorbent. For convenience, it is assumed that hot water flows in the hot water circuit 26 and cooling water flows in the cooling water circuit 29. However, these circuits 26 and 29 are substantially constituted by a common heating / cooling tube 11a. Connected, the medium itself is the same water, only the temperature is different.

At one position of the three-way switching valves 31 and 32 (refrigerant desorption mode), the hot water circuit 26 is connected to the heating / cooling tube 11 a of the adsorption unit 11. That is, a hot water pipe from the upper part of the hot water storage tank 22 is connected to one end (inlet end) of the heating / cooling tube 11a via the three-way switching valve 31, and the other end (outlet end) of the heating / cooling tube 11a is connected to the three-way switching valve 31. The hot water tank 22 is connected to the bottom (the inlet of the hot water pump 25) via the switching valve 32.
At other positions (refrigerant adsorption mode) of the three-way switching valves 31, 32, the cooling water circuit 29 is connected to the heating / cooling tube 11 a of the adsorption unit 11. That is, the outlet side of the cooler 27 (discharge port of the cooling water pump 28) is connected to one end (inlet end) of the heating / cooling tube 11a via the three-way switching valve 31, and the other end of the heating / cooling tube 11a. The (exit end) is connected to the inlet side of the cooler 27 via the three-way switching valve 32.

As described above, the cooling water circuit 29 is located at the other position (refrigerant adsorption mode) of the three-way switching valves 31 and 32, the cooler 27 → the cooling water pump 28 → the three-way switching valve 31 → the heating / cooling tube 11a → the three-way. A circulation circuit of switching valve 32 → cooler 27 is formed.
The cooling water circuit 29 also has a branch circuit 34 that branches from the upstream of the three-way switching valve 31 via the on-off valve 33 downstream of the cooling water pump 28. The on-off valve 33 is opened in the refrigerant desorption mode.
The branch circuit 34 is configured to pass through the heat exchange passage 8b of the second subcooling heat exchanger 8 and the heat exchange passage 12a of the condensing unit 12 in this order and return to the cooler 27.

Next, the operation will be described.
The adsorption refrigeration apparatus 10 periodically repeats the refrigerant adsorption mode (cooling mode) and the refrigerant desorption mode (cold storage mode).
2 and 3 are diagrams showing the flow of the refrigerant and the like in the refrigerant adsorption mode and the refrigerant desorption mode, respectively. Regarding the valve and the pump, those in the opened state or the activated state are shown in white, and the valve is closed. The state or inactive state is shown in black.

[Refrigerant adsorption mode: Fig. 2]
In either case of the refrigerant adsorption mode or the refrigerant desorption mode, the circulation pump 23 of the heat recovery circuit 24 and the cooling water pump 28 of the cooling water circuit 29 are operated.
In the case of the refrigerant adsorption mode, the three-way switching valves 31 and 32 are switched to the cooling water circuit 29 selection side in order to cool the adsorption unit 11. The on-off valve 33 is closed, and the supply of cooling water to the branch circuit 34 (second subcooling heat exchanger 8 and condensing unit 12) is stopped. Further, the operation of the hot water pump 25 of the hot water circuit 26 is stopped. Further, the operation of the refrigerant supply pump 16 to the evaporation unit 13 is performed.

As a result, a circulating flow of cooling water of the cooler 27 → the cooling water pump 28 → the three-way switching valve 31 → the heating / cooling tube 11a of the adsorption unit 11 → the three-way switching valve 32 → the cooler 27 is formed. Cooling water flows through the heating / cooling tube 11a. As a result, the adsorbent of the adsorption unit 11 is cooled (returned to normal temperature), and the vapor refrigerant is adsorbed by the adsorbent in the adsorption unit 11. Adsorption heat is generated with the adsorption reaction, but can be removed by cooling with cooling water. Along with the suction, the pressure in the suction part 11 decreases. As a result, the one-way valve 15 between the condensing unit 12 is closed, but the one-way valve 14 between the condensing unit 12 is opened and the refrigerant flows from the evaporating unit 13 to the adsorbing unit 11. Thereby, the pressure in the evaporation part 13 also falls, the refrigerant outside the heat exchange passage 7a evaporates in the evaporation part 13, and the main refrigerant (low boiling point refrigerant) in the heat exchange passage 7a is cooled.
At this time, the operation of the pump 16 causes the liquid refrigerant at the bottom of the condensing unit 12 and the liquid refrigerant at the bottom of the evaporating unit 13 to be supplied to the outside of the heat exchange passage 7a through the refrigerant distribution tube 17, thereby promoting the evaporation of the refrigerant. .

  Therefore, in the refrigerant adsorption mode, the main refrigerant of the vapor compression refrigeration apparatus 1 can be supercooled by the first supercooling heat exchanger 7, that is, the evaporation section 13 of the adsorption refrigeration apparatus 10. In this case, the evaporating unit 13 directly cools the low boiling point refrigerant of the vapor compression heat pump circuit, so that the evaporating unit 13 makes cold water, and thus the efficiency is lower than when the low boiling point refrigerant of the vapor compression heat pump circuit is cooled. good.

  In the refrigerant adsorption mode, the hot water circuit 26 is not used, but since the operation of the circulation pump 23 of the heat recovery circuit 24 is continued, the heat storage in the hot water in the hot water storage tank 22 is continued. Thereby, the electric power generating apparatus 21 is cooled moderately, and it becomes easy to maintain a fixed output.

[Refrigerant desorption mode: Fig. 3]
In the refrigerant desorption mode, the hot water pump 25 of the hot water circuit 26 is operated to heat the adsorption unit 11 and the three-way switching valves 31 and 32 are switched to the hot water circuit 26 selection side. The on-off valve 33 opens and supplies cooling water to the branch circuit 34 (second subcooling heat exchanger 8 and condensing unit 12). In addition, the operation of the refrigerant supply pump 16 to the evaporation unit 13 is stopped.
In this case, the hot water pump 25 is operated at a flow rate approximately twice that of the circulation pump 23 of the heat recovery circuit 24. This is to make full use of the hot water stored in the refrigerant adsorption mode.

  As a result, a hot water circulation flow of the hot water storage tank 22 → the three-way switching valve 31 → the heating / cooling tube 11a of the adsorption unit 11 → the three-way switching valve 32 → the hot water pump 25 → the hot water storage tank 22 is formed. Hot water flows through the cooling tube 11a. Therefore, the adsorption part 11 can be sufficiently heated using the hot water stored in the refrigerant adsorption mode. As a result, the adsorbent of the adsorption unit 11 is heated, and the vapor refrigerant is desorbed and released from the adsorbent in the adsorption unit 11. Thereby, the pressure in the adsorption part 11 rises, and the one-way valve 14 between the evaporation part 13 is closed, but the one-way valve 15 between the condensation part 12 is opened. As a result, the vapor refrigerant desorbed from the adsorbent in the adsorption unit 11 flows into the condensation unit 12. Thereby, the pressure in the condensation part 12 also rises and the refrigerant condenses and liquefies around the heat exchange passage 7a in the condensation part 12.

Further, when the on-off valve 33 is opened under the operation of the cooling water pump 28 of the cooling water circuit 29, the cooling water by the cooler 27 is diverted to the branch circuit 34 (the second supercooling heat exchanger 8 and the condensing unit 12). Supplied to.
Therefore, the vapor refrigerant that has flowed into the condensing unit 12 is cooled by the cooling water flowing through the heat exchange passage 12a in the condensing unit 12, thereby promoting condensing and liquefaction.

At this time, the cooling water by the cooler 27 is supplied to the second supercooling heat exchanger 8 (its heat exchange passage 8b), so that the main refrigerant flowing through the heat exchange passage 8a can be supercooled.
Accordingly, in the refrigerant desorption mode, the main refrigerant is not supercooled by the first supercooling heat exchanger 7, that is, the evaporator 13 of the adsorption refrigeration apparatus 10, but the second supercooling heat exchanger 8 is not used. Thus, the main refrigerant of the vapor compression refrigeration apparatus 1 can be supercooled using the cooling water from the cooler 27.

The cooler 27 is used for removing heat generated by adsorption at the adsorption unit 11 in the refrigerant adsorption mode, and is used for cooling the condensing unit 12 in the refrigerant desorption mode.
Generally, the adsorption heat generation per unit weight of water is larger than the amount of latent heat per unit weight of water, so that there is a margin only by cooling the condensing unit 12.
In the refrigerant adsorption mode, if the adsorption heat generation amount at the adsorption unit 11 is 7.4 kW, for example, and the cooling unit 27 is required to have a capacity of 7.4 kW, the capability required for cooling the condensing unit 12 in the refrigerant desorption mode. Is lower than that, for example, 4.4 kW, and there is a margin of 7.4-4.4 = 3.0 kW. Using this margin, the second supercooling heat exchanger 8 can be supercooled.

In the present embodiment, the cooler 27 is configured to supply cooling water in series in the order of the second supercooling heat exchanger 8 and the condensing unit 12 in the refrigerant desorption mode.
According to this, at the time of heat exchange in the second supercooling heat exchanger 8, the temperature difference from the main refrigerant becomes large, and the supercooling effect can be further increased.
However, the order may be reversed or parallel.

In this embodiment, the power generation device 21 is used as a heat source for the heating means, and heat generated by the power generation device 21 along with power generation is recovered in a hot water storage tank 22 as a heat storage unit, and this is used for the adsorption refrigeration device 10. Yes. As the power generation device 21, a fuel cell (SOFC, PEFC, etc.), a gas turbine generator, or the like can be used.
The cogeneration system including the power generation device 21 normally uses heat generated by power generation for hot water supply. Therefore, it is relatively easy to install a cogeneration system in a place where heat is used, such as a cleaning shop or a family restaurant.
On the other hand, there is a high demand for refrigeration for cooling, refrigeration and freezing even in places that do not use much heat, such as convenience stores. In such a case, the cogeneration system by the combination of the power generator 21 and the adsorption refrigeration apparatus 10 is effective, and the introduction promotion of the cogeneration system can be expected.

  In this embodiment, the hot water circuit 26 is used only in the refrigerant desorption mode, but is circulated at a larger flow rate (for example, twice the flow rate) than the circulation flow rate of the heat recovery circuit 24 that circulates constantly. Thereby, the warm water which stored heat can be fully utilized.

  In the present embodiment, the liquid refrigerant return passage 18 from the condensing unit 12 is connected to the suction port of the pump 16, but the pump 16 may be bypassed and directly connected to the evaporation unit 13. The pump 16 may be always operated.

Next, the embodiment of FIG. 4 will be described.
Consider a case where the operation of the vapor compression refrigeration apparatus 1 is stopped. For example, when using it for a freezer showcase in a convenience store, the compressor 2 is stopped for defrosting at a frequency of about 30 minutes in 6 hours. In this case, the operation of the adsorption refrigeration apparatus 10 is also stopped. The same applies to maintenance.
On the other hand, since the operation of the power generator 21 is continued, the operation of the circulation pump 23 of the heat recovery circuit 24 is continued, and the heat generated by the power generation is recovered, and at the same time, the power generator 21 is appropriately cooled.
However, the temperature of the hot water in the hot water storage tank 22 increases excessively with time. In such a case, it is necessary to appropriately cool the hot water in the hot water storage tank 22.

Therefore, in the embodiment of FIG. 4, the configuration of the thick line portion is added to the embodiment of FIG. That is, a branch circuit 42 that branches through a normally closed on-off valve 41 is provided on the outlet side of the cooler 27. The branch circuit 42 is connected to the suction port of the hot water pump 25.
In the refrigerant adsorption mode and the refrigerant desorption mode, the on-off valve 41 is closed, the branch circuit 42 does not function, and the flow of the refrigerant and the like is as described above.

The operation during operation of the power generator 21 when the operation of the vapor compression refrigeration apparatus 1 is stopped will be described.
FIG. 5 is a diagram showing the flow of cooling water or the like in the operation stop mode of the refrigeration apparatus. Regarding the valves, pumps and fans, those in the valve open state or in the operating state are shown in white, and those in the valve closed state or inactive state Is shown in black.

  In the operation stop mode of the refrigeration apparatus, the circulation pump 23 of the heat recovery circuit 24 continues to operate. Further, the fan 27a of the cooler 27 is operated, the on-off valve 41 is opened, and the hot water pump 25 is operated. In addition, the hot water circuit 26 is selected for the three-way switching valve 31, and the cooling water circuit 29 is selected for the three-way switching valve 32.

Therefore, the cooling water by the cooler 27 reaches the hot water pump 25 from the on-off valve 41 through the branch circuit 42 and is supplied to the bottom of the hot water storage tank 22. The hot water extruded from the upper part of the hot water storage tank 22 to the hot water circuit 26 passes through the tube 11a of the adsorption part 11 from the three-way switching valve 31 and is sent to the cooler 27 from the three-way switching valve 32 on the outlet side to be cooled.
Thereby, the excessive temperature rise of the hot water in the hot water storage tank 22 is suppressed, and the power generation device 21 can be appropriately cooled.
The on-off valve 41, the branch circuit 42, and the like correspond to an overheat suppression circuit that suppresses overheating of the heat storage unit (hot water storage tank 22) with the cooling medium (cooling water) supplied from the cooler 27.

The main refrigeration cycle may be a supercritical cycle using a CO ₂ refrigerant. In this case, the condenser 3 can be replaced with a gas cooler. In the case of a supercritical cycle, if the refrigerant at the gas cooler outlet is supercooled, it is effective because the discharge pressure of the compressor can be lowered in addition to reducing the discharge capacity of the compressor.

  As described above, the illustrated embodiment is merely an example of the present invention, and the present invention is not limited to the embodiment described directly, and various modifications made by those skilled in the art within the scope of the claims. Needless to say, this includes improvements and changes.

DESCRIPTION OF SYMBOLS 1 Vapor compression refrigeration apparatus 2 Compressor 3 Condenser 4 Expansion valve 5 Evaporator 7 1st supercooling heat exchanger 8 2nd supercooling heat exchanger 10 Adsorption-type refrigeration apparatus 11 Adsorption part 11a Tube 11b With adsorbent Fin 12 Condenser 13 Evaporator 14, 15 One-way valve 16 Pump 17 Refrigerant spray pipe 18 Liquid refrigerant return passage 19 Liquid refrigerant take-out passage 21 Power generator 22 Hot water storage tank 23 Circulation pump 24 Heat recovery circuit 25 Hot water pump 26 Hot water circuit 27 Cooler 28 Cooling water pump 29 Cooling water circuits 31 and 32 Three-way switching valve 33 On-off valve 34 Branch circuit 41 On-off valve 42 Branch circuit

Claims (5)

A refrigeration system comprising an adsorption refrigeration cycle for supercooling a main refrigerant of a main refrigeration cycle,
An adsorbing portion comprising an adsorbent that adsorbs the adsorbing refrigerant by being cooled and desorbing the adsorbing refrigerant by being heated;
A condensing part for condensing the adsorbed adsorbed refrigerant in a refrigerant desorption mode in which the adsorbent desorbs the adsorbed refrigerant;
An evaporating unit that evaporates the adsorbed refrigerant condensed by the condensing unit and supplies it to the adsorbing unit in a refrigerant adsorption mode in which the adsorbent adsorbs the adsorbed refrigerant;
A heat storage unit that stores heat in the heating medium in the refrigerant adsorption mode, and a heat source capable of supplying the heating medium from the heat storage unit to the adsorption unit in the refrigerant desorption mode;
A cooler capable of supplying a cooling medium to the adsorption unit in the refrigerant adsorption mode and capable of supplying a cooling medium to the condensing unit in the refrigerant desorption mode;
A first supercooling heat exchanger capable of supercooling the main refrigerant by exchanging heat between the main refrigerant and the adsorbed refrigerant that is incorporated in the main refrigeration cycle and evaporates in the evaporator in the refrigerant adsorption mode;
A second subcooling heat exchange that can be supercooled by at least a part of the cooling medium incorporated in the main refrigeration cycle and supplied from the cooler in the refrigerant desorption mode with the main refrigerant. and the vessel,
A refrigeration system comprising a refrigeration system.   2. The cooling device according to claim 1, wherein the cooler supplies a cooling medium in series in the order of the second supercooling heat exchanger and the condensing unit in the refrigerant desorption mode. Refrigeration system. The heat source is a power generation device that generates heat with power generation, and the heat storage unit is a hot water storage tank that stores hot water as a heating medium,
A heat recovery circuit for circulating hot water between the hot water storage tank and the heat generation unit of the power generation device, and a hot water circuit for circulating hot water between the hot water storage tank and the adsorption unit in the refrigerant desorption mode. The refrigeration system according to claim 1 or 2, further comprising a refrigeration system. The heat recovery circuit circulates hot water in both the refrigerant adsorption mode and the refrigerant desorption mode,
The refrigeration system according to claim 3, wherein the hot water circuit circulates hot water at a flow rate larger than a circulation flow rate of the heat recovery circuit only in the refrigerant desorption mode. 5. The apparatus according to claim 1, further comprising an overheat suppression circuit that suppresses overheating of the heat storage unit with a cooling medium supplied from the cooler when the operation of the main refrigeration cycle is stopped. The refrigeration system described in.