JP2005326121A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of saving energy without a heating heater for reproducing desiccant. <P>SOLUTION: Heat of a refrigerant of a first refrigerant circuit 40 and a refrigerant of a second refrigerant circuit 50 are exchanged by a cascade condenser 33 of a refrigerator unit 30. Therefore, reproduction of a desiccant rotor 12 of an air conditioning unit 10 and heating in a shop A can be conducted by heat absorbed by cooling operation of each refrigerating showcase 20, and thus a separate heater is not necessary to reproduce the desiccant rotor 12 as conventionally, and manufacturing cost and power consumption can be reduced. In addition, exhaust heat of each refrigerating showcase 20 exhausted outside the shop A as the exhaust heat can be effectively utilized, and energy can be saved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner that performs air conditioning in a store in which a refrigeration / refrigeration showcase such as a supermarket or a convenience store is installed.

  Conventionally, this type of air conditioner includes a first heat exchanger that exchanges heat with air flowing in the first ventilation path, and a second heat exchanger that exchanges heat with air flowing in the second ventilation path. A heat exchanger, a desiccant rotor that adsorbs moisture in the air flowing through the first ventilation path and discharges it into the second ventilation path, and the second compressor and the first heat exchanger by the first compressor. A first refrigerant circuit that sequentially circulates the refrigerant in the heat exchanger, cools the air in the first ventilation path by the refrigerant flowing through the first heat exchanger, and supplies the air to the predetermined conditioned space, It is known that the air in the second ventilation path is heated by the refrigerant flowing through the second heat exchanger to release the moisture of the desiccant rotor into the second ventilation path (for example, a patent Reference 1).

In addition, freezer / refrigerated showcases are installed in stores such as supermarkets and convenience stores, and the refrigerant evaporated in the freezer / refrigerator showcase evaporator is installed in heat exchangers in refrigerators installed outside the store. The refrigerant is condensed by exchanging heat with the outside air.
JP 2003-227777 A

  However, in the conventional air conditioner, since the air flowing through the first ventilation path that exchanges heat with the first heat exchanger is dehumidified by the desiccant rotor, the first heat exchanger has only sensible heat. The amount of heat for heating the air in the second ventilation path necessary for regenerating the desiccant rotor is insufficient. For this reason, it is necessary to provide a separate heater, and there is a problem that the amount of power consumption increases.

  Further, the heat released from the refrigerant in the heat exchanger for showcase is discharged to the outside, and there is a problem that the exhaust heat is not effectively used.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioner that can save energy without requiring a heater for regenerating the desiccant. is there.

  In order to achieve the above object, the present invention provides a first heat exchanger for exchanging heat with air flowing in the first ventilation path, and a second for exchanging heat with air flowing in the second ventilation path. A heat exchanger, a moisture absorbing member that adsorbs moisture in the air flowing through the first ventilation path and discharges it into the second ventilation path, and the second compressor and the first heat exchanger by the first compressor. A first refrigerant circuit that sequentially circulates the refrigerant in the heat exchanger, and cools or heats the air in the first ventilation path with the refrigerant flowing through the first heat exchanger and supplies the air to the predetermined air-conditioned space In the air conditioner, the air in the second ventilation path is heated by the refrigerant flowing through the second heat exchanger to release the moisture in the moisture absorbing member into the second ventilation path. 3rd heat exchanger provided in the refrigerant | coolant suction side of the 1st compressor in the refrigerant circuit of, and the evaporator of other refrigeration equipment A second refrigerant circuit that circulates the refrigerant discharged from the second compressor through the third heat exchanger and the expansion means and sucks the refrigerant into the second compressor, and includes a first refrigerant circuit. The third heat exchanger exchanges heat between the low temperature side refrigerant sucked into the compressor and the high temperature side refrigerant discharged from the second compressor of the second refrigerant circuit. As a result, the low-temperature side refrigerant of the first refrigerant circuit and the high-temperature side refrigerant of the second refrigerant circuit are heat-exchanged, so that moisture of the moisture absorbing member in the second ventilation path is released into the second ventilation path. The amount of heat to be supplied is supplied from the exhaust heat of other refrigeration equipment via the third heat exchanger.

  According to the present invention, it is possible to release moisture from the moisture absorbing member of the air conditioning unit or to heat the store by exhaust heat from other refrigeration equipment. For example, it is necessary to use a separate heater for regeneration of the desiccant rotor as in the prior art. Therefore, the manufacturing cost and power consumption can be reduced. In this case, since the exhaust heat of other refrigeration equipment can be used effectively, energy saving can also be achieved.

  1 to 4 show an embodiment of the present invention, FIG. 1 is a refrigerant circuit diagram of an air conditioner, FIG. 2 is a block diagram showing a control system, and FIG. 3 is an air conditioner during dehumidifying and cooling operation. FIG. 4 is a refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during heating operation.

  The air conditioner includes an air conditioning unit 10 that performs air conditioning in a store, a plurality of refrigerated showcases 20 as other refrigeration devices installed in the store A, and each of the refrigerated showcase 20 and the air conditioning unit 10. Refrigerator unit 30 serving as the heat source, first refrigerant circuit 40 constituting the refrigeration cycle on the air conditioning unit 10 side, second refrigerant circuit 50 constituting the refrigeration cycle on the refrigerated showcase 20 side, and air conditioning unit 10 and a control unit 60 for controlling the temperature or operation of each refrigerated showcase 20.

  The air conditioning unit 10 is dehumidified by a unit main body 11 installed in a backyard or a machine room provided behind the ceiling of the store A or adjacent to the store A, a desiccant rotor 12 that dehumidifies the air in the store A, and the like. Air conditioner blower 13 for circulating air, first heat exchanger 14 for cooling or heating the dehumidified air, regeneration fan 15 for circulating air for regenerating desiccant rotor 12, and air for regenerating desiccant rotor 12 And a second heat exchanger 16 for heating.

  The unit body 11 includes a first ventilation path 11a and a second ventilation path 11b provided side by side by partitioning the inside thereof, and both end portions of the first ventilation path 11a and both end portions of the second ventilation path 11b. Each is provided with an opening to which a duct is connected. Further, both end portions of the first ventilation path 11a communicate with each other in the store A, and both end portions of the second ventilation path 11b communicate with each other outside the store A.

  The desiccant rotor 12 is made of a member in which an element 12a containing a hygroscopic agent such as silica gel or zeolite is formed in a disk shape, and is provided across the first ventilation path 11a and the second ventilation path 11b. Further, the desiccant rotor 12 rotates the element 12a between the first ventilation path 11a and the second ventilation path 11b by rotating the element 12a around the radial center by a motor (not shown). While moving.

  The air conditioner blower 13 is installed in the first ventilation path 11a, and circulates the air in the store A by circulating air from one end side to the other end side of the first ventilation path 11a. ing.

  The first heat exchanger 14 is provided on the downstream side of the desiccant rotor 12 in the first ventilation path 11a, and heats or cools the air in the store A dehumidified by the desiccant rotor 12.

  The regenerative blower 15 is installed in the second ventilation path 11b, and distributes the air outside the store A into the second ventilation path 11b in the direction opposite to the air flow direction in the first ventilation path 11a. It has become. Further, the regenerative blower 15 is configured to be able to change the blown amount.

  The second heat exchanger 16 is provided on the upstream side of the desiccant rotor 12 in the second ventilation path 11b, and the air flowing through the second ventilation path 11b for regenerating the element 12a of the desiccant rotor 12 that has absorbed moisture. Is supposed to heat.

  Each refrigerated showcase 20 includes an open showcase with the front opened, a reach-in showcase that opens and closes the front with a glass door, and the like. Each refrigerated showcase 20 has an evaporation connected to the second refrigerant circuit 50 inside. A vessel 21 is provided. Further, an evaporator blower 22 is provided in each refrigerated showcase 20 to exchange heat between the air in each refrigerated showcase 20 and the refrigerant in the evaporator 21.

  The refrigerator unit 30 is known as a first compressor 31 connected to the first refrigerant circuit 40, a second compressor 32 connected to the second refrigerant circuit 50, and a third heat exchanger. The cascade condenser 33 is configured to exchange heat between the refrigerant in the first refrigerant circuit 40 and the refrigerant in the second refrigerant circuit 50. Further, on the discharge side of the cascade condenser 33 on the second refrigerant circuit 50 side, a condensation pressure adjustment valve 34 that can be adjusted so that the condensation pressure on the second refrigerant circuit 50 side of the cascade condenser 33 does not become a predetermined pressure or less. Is provided. Further, a liquid receiver 35 for temporarily storing the liquefied refrigerant is provided on the discharge side of the condensing pressure adjusting valve 34.

  As shown in FIG. 1, the first refrigerant circuit 40 includes a first compressor 31, a second heat exchanger 16, a first heat exchanger 14, a cascade capacitor 33, and first and second electromagnetic valves. 41a, 41b and first and second expansion valves 42a, 42b are provided, which are connected by a refrigerant circulation pipe. That is, the suction side of the second heat exchanger 16 is connected to the discharge side of the first compressor 31, and the suction side of the first heat exchanger 14 is connected to the discharge side of the second heat exchanger 16. ing. At this time, a first electromagnetic valve 41a and a first expansion valve 42a are provided in parallel between the discharge side of the second heat exchanger 16 and the suction side of the first heat exchanger 14, respectively. . The suction side of the cascade condenser 33 on the first refrigerant circuit 40 side is connected to the discharge side of the first heat exchanger 14, and the first compressor is connected to the discharge side of the cascade condenser 33 on the first refrigerant circuit 40 side. The suction side 31 is connected. At this time, a second electromagnetic valve 41b and a second expansion valve 42b are provided in parallel between the discharge side of the first heat exchanger 14 and the air conditioning suction side of the cascade condenser 33, respectively.

  As shown in FIG. 1, the second refrigerant circuit 50 includes a second compressor 32, a cascade condenser 33, each evaporator 21, a condensation pressure adjustment valve 34, a liquid receiver 35, a third electromagnetic valve 51a, and a second electromagnetic valve 51a. 3 expansion valves 52a, which are connected by piping for circulating the refrigerant. That is, the suction side of the cascade condenser 33 on the second refrigerant circuit 50 side is connected to the discharge side of the second compressor 32, and the receiver 35 is connected to the discharge side of the cascade condenser 33 on the second refrigerant circuit 50 side. The suction side is connected. At this time, a condensing pressure adjusting valve 34 is provided between the refrigeration discharge side of the cascade condenser 33 and the suction side of the liquid receiver 35. The suction side of each evaporator 21 is connected in parallel to the discharge side of the liquid receiver 35, and the suction side of the second compressor 32 is connected in parallel to the discharge side of each evaporator 21. At this time, a third solenoid valve 51a is provided between the discharge side of the liquid receiver 35 and the suction side of each evaporator 21, and the third solenoid valve 51a has a first solenoid valve 51a on each evaporator 21 side. 3 expansion valves 52b are provided.

  As shown in FIG. 2, the control unit 60 includes a microcomputer, and as shown in FIG. The solenoid valves 41a, 41b, 51a, the evaporator blower 22 and the operation switch 61 are connected.

  In the air conditioner configured as described above, when the dehumidifying and cooling operation is selected by the operation changeover switch 61, the control unit 60 closes the first electromagnetic valve 41a as shown in FIG. The solenoid valve 41b and each third solenoid valve 51a are opened, and the first compressor 31, the second compressor 32, the air conditioner blower 13, the regeneration blower 15, the desiccant rotor 12, and the evaporator blower 22 are operated. . Thereby, after the refrigerant | coolant discharged from the 1st compressor 31 distribute | circulates the 2nd heat exchanger 16, it distribute | circulates to the 1st heat exchanger 14 via the 1st expansion valve 42a. Further, the refrigerant discharged from the first heat exchanger 14 flows through the cascade condenser 33 via the second electromagnetic valve 41b, and the refrigerant discharged from the cascade condenser 33 is sucked into the first compressor 31. At this time, the refrigerant flowing into the cascade capacitor 33 is configured to be able to flow through the second electromagnetic valve 41b and the second expansion valve 42b connected in parallel. However, since the opened electromagnetic valve 41b has a remarkably smaller pressure loss through which the refrigerant flows than the expansion valve 42b, most of the circulating refrigerant does not flow through the second expansion valve 42b. It distribute | circulates to the valve 41b. The refrigerant discharged from the second compressor 32 circulates through the cascade condenser 33 and then circulates to each evaporator 21 via the third electromagnetic valve 51a and the third expansion valve 52a. It is sucked into the compressor 32. In this manner, in the air conditioning unit 10, the return air (RA) circulated from the store A to the first ventilation path 11a by the air conditioner blower 13 is dehumidified by the desiccant rotor 12, and the dehumidified air is first heated. After being cooled by exchanging heat with the exchanger 14, the air is supplied into the store A as supply air (SA). Further, the outside air (OA) circulated from the outside of the store A to the second ventilation path 11b by the regeneration blower 15 is heated by exchanging heat with the second heat exchanger 16, and the heated air is converted into an element of the desiccant rotor 12. The water adsorbed on the element 12a is evaporated by contacting with the element 12a. As a result, the element 12a of the desiccant rotor 12 is regenerated, and the air that has been used for regeneration and absorbed moisture is discharged outside the store A as exhaust (EA). In each refrigerated showcase 20, the air in the refrigerated showcase 20 is circulated by the evaporator blower 22 and cooled by the evaporator 21, thereby cooling the product in the refrigerated showcase 20.

  At this time, in the cascade condenser 33 of the refrigerator unit 30, the refrigerant in the first refrigerant circuit 40 evaporates, the refrigerant in the second refrigerant circuit 50 condenses, and the refrigerant in the first refrigerant circuit 40 and the second refrigerant circuit 40 Heat is exchanged with the refrigerant in the refrigerant circuit 50. Thereby, the refrigerant of the first refrigerant circuit 40 can absorb the amount of heat necessary to heat the air in the second ventilation path 11b in the first heat exchanger 14 and the cascade condenser 33. In addition, the exhaust heat of the second refrigerant circuit 50 that has been conventionally discharged to the outside air can be effectively used for the heat absorption of the refrigerant of the first refrigerant circuit 40.

  In addition, in order to prevent cold aisles caused by cool air descending from the front opening of the refrigerated showcase 20 to the passage in front of the refrigerated showcase 20, the supply air (SA) supplied into the store A is made high temperature and low humidity. Then, it is discharged toward the passage from the lower part of the refrigerated showcase 20. Thereby, the cold air descending from the refrigerated showcase 20 and the supply air (SA) are mixed, and the cold ale is eliminated.

  Next, when the heating operation is selected by the operation changeover switch 61, as shown in FIG. 4, the control unit 60 opens the first electromagnetic valve 41a and the third electromagnetic valve 51a, and the second electromagnetic valve 41b. , The first compressor 31, the second compressor 32, the air conditioning blower 13, the regeneration blower 15, and the evaporator blower 22 are operated to stop the desiccant rotor 12. Thereby, after the refrigerant | coolant discharged from the 1st compressor 31 distribute | circulates through the 2nd heat exchanger 16, it distribute | circulates to the 1st heat exchanger 14 via the 1st electromagnetic valve 41a. Further, the refrigerant discharged from the first heat exchanger 14 flows through the cascade condenser 33 via the second expansion valve 42 b, and the refrigerant discharged from the cascade condenser 33 is sucked into the first compressor 31. The refrigerant discharged from the second compressor 32 circulates through the cascade condenser 33 and then circulates to each evaporator 21 via the third electromagnetic valve 51a and the third expansion valve 52a. It is sucked into the compressor 32. Thus, in the air conditioning unit 10, after the return air (RA) circulated from the store A to the first ventilation path 11 a by the air conditioning blower 13 is heated by exchanging heat with the first heat exchanger 14. Supply into store A as supply air (SA). Further, the outside air (OA) circulated from the outside of the store A to the second ventilation path 11b by the regeneration fan 15 is heated by exchanging heat with the second heat exchanger 16, and then discharged to the outside as exhaust (EA). The In each refrigerated showcase 20, the air in the refrigerated showcase 20 is circulated by the evaporator blower 22 and cooled by the evaporator 21, thereby cooling the product in the refrigerated showcase 20.

  At this time, in the cascade condenser 33 of the refrigerator unit 30, the refrigerant in the first refrigerant circuit 40 evaporates, the refrigerant in the second refrigerant circuit 50 condenses, and the refrigerant in the first refrigerant circuit 40 and the second refrigerant circuit 40 Heat is exchanged with the refrigerant in the refrigerant circuit 50. As a result, the refrigerant of the first refrigerant circuit 40 can absorb the heat necessary for heating the air in the first ventilation path 11a in the cascade condenser 33. In addition, since the dehumidifying operation is not performed during the heating operation, when the heating load is large, the amount of exchange heat of the second heat exchanger 16 is reduced by decreasing or stopping the amount of air blown by the regeneration fan 15. Thus, the amount of heat absorbed by the cascade capacitor 33 can be dissipated only by the first heat exchanger 14. Furthermore, by operating the desiccant rotor 12 during the heating operation, it is possible to perform the heating operation in the store A and the dehumidifying operation.

  Thus, according to the air conditioning apparatus of the present embodiment, the cascade condenser 33 of the refrigerator unit 30 causes the refrigerant in the first refrigerant circuit 40 and the refrigerant in the second refrigerant circuit 50 to exchange heat. In addition, it is possible to regenerate the desiccant rotor 12 of the air conditioning unit 10 or to heat the store A by exhaust heat of each refrigerated showcase 20, and it is not necessary to use a separate heater for the regeneration of the desiccant rotor 12 as in the prior art. Cost reduction and power consumption can be reduced. In addition, the exhaust heat of each refrigerated showcase 20 that has been exhausted outside the store A as exhaust heat can be effectively used, and energy saving can also be achieved.

  Further, the first heat exchanger 14 of the first refrigerant circuit 40 acts as an evaporator during the cooling operation of the air conditioning unit 10, and the first heat of the first refrigerant circuit 40 during the heating operation of the air conditioning unit 10. Since the exchanger 14 can act as a condenser, the heat absorbed by the cooling operation of each refrigerated showcase 20 can be used for the cooling operation and the heating operation of the air conditioning unit 10, respectively. The exhaust heat of each refrigerated showcase 20 that has been exhausted can be used effectively throughout the year.

  In addition, when the heating load is large during the heating operation of the air conditioning unit 10, the amount of air blown by the regeneration blower 15 is reduced or stopped, so that the amount of heat absorbed in the cascade condenser 33 is converted into the first heat exchanger. 14 can be used only, and sufficient heating capacity can be obtained.

  Further, since the condensing pressure adjusting valve 34 for adjusting the condensing pressure on the refrigeration side of the cascade condenser 33 so as not to become a predetermined pressure or lower is provided on the discharge side of the cascade condenser 33 on the second refrigerant circuit 50 side. It is possible to prevent the difference between the condensation pressure and the evaporation pressure in the refrigerant circuit 50 from being equal to or less than a predetermined pressure difference, and to prevent a decrease in the cooling capacity of each refrigerated showcase 20.

  FIGS. 5 to 8 show other embodiments of the present invention, FIG. 5 is a refrigerant circuit diagram of an air conditioner, FIG. 6 is a block diagram showing a control system, and FIG. 7 is an air conditioner during a dehumidifying and cooling operation. FIG. 8 is a refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during heating operation. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  As shown in FIG. 5, the first refrigerant circuit 70 of the present embodiment includes a first compressor 31, a second heat exchanger 16, a first heat exchanger 14, a cascade condenser 33, a first, a first, 2, 4th and 5th solenoid valves 71a, 71b, 71c, 71d and 1st and 2nd expansion valves 42a, 42b are provided, and these are connected by piping for refrigerant circulation. That is, the suction side of the second heat exchanger 16 is connected to the discharge side of the first compressor 31, and the suction side of the first heat exchanger 14 is connected to the discharge side of the second heat exchanger 16. ing. Between the discharge side of the second heat exchanger 16 and the suction side of the first heat exchanger 14, a first electromagnetic valve 71a and a first expansion valve 42a are respectively provided in parallel. The suction side of the cascade condenser 33 on the first refrigerant circuit 70 side is connected to the discharge side of the first heat exchanger 14, and the first compressor is connected to the discharge side of the cascade condenser 33 on the first refrigerant circuit 70 side. The suction side 31 is connected. A second electromagnetic valve 71b is provided between the discharge side of the first heat exchanger 14 and the suction side of the cascade condenser 33 on the first refrigerant circuit 50 side, and the cascade condenser 33 of the second electromagnetic valve 71b. On the side, a second expansion valve 42b is provided. In addition, the second heat exchanger 16 is connected between the first electromagnetic valve 71a and the first expansion valve 42a, and between the second electromagnetic valve 71b and the second expansion valve 42b, Between the 1st heat exchanger 14 and the 2nd solenoid valve 71b, and between the cascade condenser 33 and the 1st compressor 31 are connected. A fourth electromagnetic valve 71c is provided between the second heat exchanger 16, the first electromagnetic valve 71a and the first expansion valve 42a, and between the second electromagnetic valve 71b and the second expansion valve 42b. And a fifth electromagnetic valve 71d is provided between the first heat exchanger 14 and the second electromagnetic valve 71b and between the cascade condenser 33 and the first compressor 31. .

  As shown in FIG. 6, the control unit 80 includes a desiccant rotor 12, an air conditioner blower 13, a regeneration blower 15, a first compressor 31, a second compressor 32, first to fifth electromagnetic valves 71 a, 71b, 51a, 71c, 71d The evaporator blower 22 and the operation switch 61 are connected.

  In the air conditioner configured as described above, when the dehumidifying and cooling operation is selected by the changeover switch 61, the control unit 80 causes the first electromagnetic valve 71a and the second electromagnetic valve 71b to move as shown in FIG. The third solenoid valve 51a, the fourth solenoid valve 71c, and the fifth solenoid valves 71d are closed to open the first compressor 31, the second compressor 32, the air conditioner blower 13, and the regeneration blower. 15. The desiccant rotor 12 and the evaporator blower 22 are operated. As a result, the refrigerant discharged from the first compressor 31 branches after flowing through the second heat exchanger 16, and flows into the first heat exchanger 14 via the first expansion valve 42a. At the same time, the refrigerant flows through the cascade capacitor 33 via the fourth electromagnetic valve 71c and the second expansion valve 42b. Further, the refrigerant discharged from the first heat exchanger 14 and the cascade condenser 33 is sucked into the first compressor 31. The refrigerant discharged from the second compressor 32 circulates through the cascade condenser 33 and then circulates to each evaporator 21 via the third electromagnetic valve 51a and the third expansion valve 52a. It is sucked into the compressor 32. In this manner, in the air conditioning unit 10, the return air (RA) circulated from the store A to the first ventilation path 11a by the air conditioning blower 13 is dehumidified by the desiccant rotor 12, and the dehumidified air is converted into the first heat. After being cooled by exchanging heat with the exchanger 14, the air is supplied into the store A as supply air (SA). Further, the outside air (OA) circulated from the outside of the store A to the second ventilation path 11b by the regeneration blower 15 is heated by exchanging heat with the second heat exchanger 16, and the heated air is converted into an element of the desiccant rotor 12. The element 12a of the desiccant rotor 12 that has absorbed moisture is regenerated by being brought into contact with 12a, and the air used for the regeneration is discharged outside the store A as exhaust (EA). In each refrigerated showcase 20, the air in the refrigerated showcase 20 is circulated by the evaporator blower 22 and cooled by the evaporator 21, thereby cooling the product in the refrigerated showcase 20.

  At this time, in the cascade condenser 33 of the refrigerator unit 30, the refrigerant in the first refrigerant circuit 70 evaporates, the refrigerant in the second refrigerant circuit 50 condenses, and the refrigerant in the first refrigerant circuit 70 and the second refrigerant circuit 70 are condensed. Heat is exchanged with the refrigerant in the refrigerant circuit 50. As a result, the refrigerant in the first refrigerant circuit 70 can absorb the amount of heat necessary for heating the air in the second ventilation path 11 b in the first heat exchanger 14 and the cascade condenser 33. In addition, the exhaust heat of the second refrigerant circuit 50 that has been conventionally discharged to the outside air can be effectively used for the heat absorption of the refrigerant of the first refrigerant circuit 70.

  Next, when the heating operation is selected by the changeover switch 61, as shown in FIG. 8, the control unit 80 opens the first, second and third electromagnetic valves 71a, 71b, 51a, and the fourth and fourth electromagnetic valves. 5, the first compressor 31, the second compressor 32, the air conditioner blower 13, the regeneration blower 15 and the evaporator blower 22 are operated to stop the desiccant rotor 12. Thereby, after the refrigerant | coolant discharged from the 1st compressor 31 distribute | circulates through the 2nd heat exchanger 16, it distribute | circulates to the 1st heat exchanger 14 via the 1st electromagnetic valve 71a. Further, the refrigerant discharged from the first heat exchanger 14 flows through the cascade condenser 33 via the second expansion valve 42 b, and the refrigerant discharged from the cascade condenser 33 is sucked into the first compressor 31. The refrigerant discharged from the second compressor 32 circulates through the cascade condenser 33 and then circulates to each evaporator 21 via the third electromagnetic valve 51a and the third expansion valve 52a. It is sucked into the compressor 32. Thus, in the air conditioning unit 10, after the return air (RA) circulated from the store A to the first ventilation path 11 a by the air conditioning blower 13 is heated by exchanging heat with the first heat exchanger 14. Supply into store A as supply air (SA). Further, the outside air (OA) circulated from the outside of the store A to the second ventilation path 11b by the regeneration blower 15 is heat-exchanged with the second heat exchanger 16 and then heated as exhaust (EA) outside the store A. Discharged. In each refrigerated showcase 20, the air in the refrigerated showcase 20 is circulated by the evaporator blower 22 and cooled by the evaporator 21, thereby cooling the product in the refrigerated showcase 20.

  At this time, in the cascade condenser 33 of the refrigerator unit 30, the refrigerant in the first refrigerant circuit 70 evaporates, the refrigerant in the second refrigerant circuit 50 condenses, and the refrigerant in the first refrigerant circuit 70 and the second refrigerant circuit 70 are condensed. Heat is exchanged with the refrigerant in the refrigerant circuit 50. As a result, the refrigerant in the first refrigerant circuit 70 can absorb the heat necessary for heating the air in the first ventilation path 11 a in the cascade condenser 33. In addition, since the dehumidifying operation is not performed during the heating operation, when the heating load is large, the amount of exchange heat of the second heat exchanger 16 is reduced by decreasing or stopping the amount of air blown by the regeneration fan 15. Thus, the amount of heat absorbed by the cascade capacitor 33 can be dissipated only by the first heat exchanger 14.

  Thus, according to the air conditioner of the present embodiment, the refrigerant discharged from the second heat exchanger 16 is supplied to the first heat exchanger 14 and the cascade condenser 33 during the dehumidifying and cooling operation of the air conditioning unit 10. Since the first refrigerant circuit 70 is configured to circulate, the flow rate of the refrigerant circulated through the first heat exchanger 14 can be adjusted by adjusting the opening of the first expansion valve 42a. The supply air (SA) temperature distributed in the store A can be freely changed. In addition, by using an electronic expansion valve as the first expansion valve 42a, the opening of the first expansion valve 42a can be controlled by the control unit 80, and the supply air (SA) temperature circulated in the store A can be controlled. It becomes possible to control.

  In the embodiment, the exhaust heat absorbed by the evaporator 21 of the second refrigerant circuit 50 due to the cooling in the refrigerated showcase 20 is absorbed by the refrigerant of the first refrigerant circuits 40 and 70 in the cascade condenser 33. As shown in FIG. 9, a fourth heat exchanger 91 is provided in the second refrigerant circuit 50 in series or in parallel with the cascade capacitor 33 and the operation of the air conditioning unit 10 is stopped when the operation is stopped. The exhaust heat of each refrigerated showcase 20 may be released by closing the valve 93 and exchanging heat with the air outside the store A by the heat exchanger blower 92. In this case, even when the operation of the first refrigerant circuits 40 and 70 is stopped, the operation of the second refrigerant circuit 50 can be continued by operating the blower 92 for heat exchanger, and the air conditioning unit 10 is broken due to failure or the like. Even when the operation cannot be performed, the cooling operation of the refrigerated showcase 20 can be continued as a backup.

  Moreover, in the said embodiment, the return air (RA) distribute | circulated from the shop A to the 1st ventilation path 11a with the air conditioner blower 13 is dehumidified by the desiccant rotor 12, and the 1st heat exchanger 14 dehumidifies the dehumidified air. The air is supplied to the store A as the supply air (SA) after being cooled with the heat exchange, and the outside air (OA) circulated from the outside of the store A to the second ventilation path 11b by the regeneration fan 15 is supplied to the second heat. Heat is exchanged with the exchanger 16 and heated, and the heated air is brought into contact with the element 12a of the desiccant rotor 12 to regenerate the desiccant rotor 12 that has absorbed moisture, and the air used for the regeneration is discharged to the outside as exhaust (EA). As shown in FIG. 10, the air conditioning unit 10 is configured so that the outside air (OA) is sent from the outside of the store A to the first ventilation path 11 a by the air conditioning blower 13. It is distributed and supplied into the store A as supply air (SA) into the store A, and the return air (RA) is distributed from the store A to the second ventilation path 11b by the regeneration blower 15 and exhausted outside the store A. (EA) and the first heat exchanger 14 of the first ventilation path 11a by the sensible heat exchanger 94 provided over the first and second ventilation paths 11a and 11b so as to be discharged to the outside. You may make it heat-exchange the air before heat-exchanging and the air before heat-exchanging with the 2nd heat exchanger 16 of the 2nd ventilation path 11b. In this case, the return air (RA) is exhausted outside the store A as exhaust (EA), and the outside air (OA) is supplied into the store A as supply air (SA), so that ventilation can be performed at all times. The air (RA) and the outside air (OA) can be heat-exchanged by the sensible heat exchanger 94, and the air conditioning load generated during the ventilation in the store A can be reduced.

  Moreover, in the said embodiment, although the thing which has arrange | positioned the 1st heat exchanger 14 of the air conditioning unit 10 in the downstream of the desiccant rotor 12 was shown, as shown in FIG. 11, the 1st heat exchanger 14 is desiccant. It may be arranged on the upstream side of the rotor 12. In this case, by cooling the outside air (OA) before dehumidification in the desiccant rotor 12, the relative humidity can be increased, and the dehumidification efficiency of the desiccant rotor 12 can be improved.

  In the above-described embodiment, the exhaust heat of the refrigerated showcase 20 is supplied to the air conditioning unit 10 by the set of first refrigerant circuits 40. However, the plurality of first refrigerant circuits 40 are arranged in parallel. Alternatively, the exhaust heat of the refrigerated showcase 20 may be supplied to the air conditioning unit 10 by connecting in series.

  In the embodiment, the heat absorbed by the refrigerant by the cooling operation of the refrigerated showcase 20 is supplied to the air conditioning unit 10, but the cooling operation of the system constituting the refrigeration showcase and other cooling circuits is shown. The exhaust heat may be supplied to the air conditioning unit 10.

The refrigerant circuit diagram of the air conditioning apparatus which shows one Embodiment of this invention Block diagram showing the control system Refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during dehumidifying and cooling operation Refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during heating operation Refrigerant circuit diagram of an air-conditioning apparatus showing another embodiment of the present invention Block diagram showing the control system Refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during dehumidifying and cooling operation Refrigerant circuit diagram showing the refrigerant flow path of the air conditioner during heating operation Refrigerant circuit diagram of an air conditioner showing another embodiment Refrigerant circuit diagram of an air conditioner showing another embodiment Refrigerant circuit diagram of an air conditioner showing another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Air conditioning unit, 11a ... 1st ventilation path, 11b ... 2nd ventilation path, 12 ... Desiccant rotor, 14 ... 1st heat exchanger, 15 ... Blower for reproduction | regeneration, 16 ... 2nd heat exchanger, DESCRIPTION OF SYMBOLS 21 ... Evaporator, 30 ... Refrigerator unit, 31 ... 1st compressor, 32 ... 2nd compressor, 33 ... Cascade condenser, 34 ... Condensation pressure regulating valve, 40 ... 1st refrigerant circuit, 50 ... 1st 2 refrigerant circuits, 60 ... control unit, A ... store.

Claims (6)

A first heat exchanger for exchanging heat with air flowing in the first ventilation path, a second heat exchanger for exchanging heat with air flowing in the second ventilation path, and in the first ventilation path A moisture absorption member that adsorbs moisture in the air flowing through the second air passage and releases it into the second ventilation path, and a first compressor sequentially circulates the refrigerant to the second heat exchanger and the first heat exchanger. 1 refrigerant circuit, the air in the first ventilation path is cooled or heated by the refrigerant flowing through the first heat exchanger, and supplied to a predetermined air-conditioned space, and flows through the second heat exchanger. In the air conditioner in which the air in the second ventilation path is heated by the refrigerant and the moisture in the moisture absorbing member is released into the second ventilation path.
A third heat exchanger provided on the refrigerant suction side of the first compressor in the first refrigerant circuit;
A second refrigerant circuit that circulates the refrigerant discharged from the second compressor to the evaporator of the other refrigeration equipment through the third heat exchanger and the expansion means and sucks the refrigerant into the second compressor;
The third heat exchanger exchanges heat between the low-temperature side refrigerant sucked into the first compressor of the first refrigerant circuit and the high-temperature side refrigerant discharged from the second compressor of the second refrigerant circuit. An air conditioner characterized by being configured as described above. A cooling operation for cooling the air in the first ventilation path by the first heat exchanger by circulating the refrigerant discharged from the second heat exchanger to the first heat exchanger via the expansion means; A heating operation for heating the air in the first ventilation path by the first heat exchanger by circulating the refrigerant discharged from the second heat exchanger to the first heat exchanger without passing through the expansion means. The air conditioning apparatus according to claim 1, further comprising switching means for switching. A part of the refrigerant discharged from the second heat exchanger is circulated to the first heat exchanger via the expansion means, and the other refrigerant is not circulated to the first heat exchanger via the expansion means. The cooling operation for cooling the air in the first ventilation path by the first heat exchanger by circulating it through the third heat exchanger and the refrigerant discharged from the second heat exchanger without the expansion means A switching means for switching between heating operation in which air in the first ventilation path is heated by the first heat exchanger by passing through the first heat exchanger is provided. Air conditioner. An air volume adjustable air blower provided in the second ventilation path;
The air conditioning apparatus according to claim 1, 2, or 3, further comprising a control unit that reduces the air volume of the blower when the heating load increases during the heating operation. The air conditioning apparatus according to claim 1, 2, 3, or 4, further comprising a fourth heat exchanger capable of exchanging heat between the high-temperature refrigerant of the second refrigerant circuit and the outside air. The condensation pressure adjusting means capable of adjusting the condensation pressure on the second refrigerant circuit side in the third heat exchanger to be equal to or higher than a predetermined pressure is provided. The claim 1, 2, 3, 4 or 5 Air conditioner.

Images