JP2000121102A - Air-conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioner to effectively improve air-conditioning performance in a shop as the feet of customers are prevented from feeling chilly by cold air flowing over an open showcase. SOLUTION: An air-conditioning device is used in a shop where an open showcase is installed and comprises a duct D1 on the showcase side to intercommunicate a floor part in the vicinity of the open showcase 4 and an air- conditioner 1 arranged at a shop; and a duct D2 on the load side to intercommunicate the ceiling part, corresponding to a spot having a high cooling load in the shop, and the air-conditioner 1. A flow of air between ducts is generated by the blower 23 of the air-conditioner 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in a store.

[0002]

2. Description of the Related Art In a store such as a supermarket, cool air in a showcase overflows from openings of a plurality of open showcases installed in the store and stays widely on a floor surface in front of the showcase. Cold aisle occurs. This cold aisle makes customers feel cold and discomfort.

[0003] Conventionally, as disclosed in Japanese Patent Publication No. 60-5859, an air conditioner used in a store is replaced with a floor duct of a showcase in order to eliminate a temperature drop near the showcase due to cold aisle. With the ventilation duct of the ceiling duct arranged at the top of the showcase,
When performing a cooling operation in a store, a cold aisle was taken in from a floor duct, further cooled by an air conditioner, and discharged from a ceiling duct. Also, when performing a heating operation inside the store, air is taken in from the ceiling duct, heated by an air conditioner,
It was discharged from the floor duct.

[0004]

However, the conventional air conditioner discharges cool air from ceiling ducts formed in all parts of the store during the cooling operation. Temperature differences also occur between locations with large cooling loads, especially near cash registers (cashier counters) where temperature tends to rise, and areas where non-cool shelves, gondola, etc. are installed, to achieve uniform temperatures throughout the store. Was difficult in practice.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides an air conditioner capable of effectively improving the air-conditioning performance in a store while eliminating the cooling of the customer's feet caused by the cold air overflowing from an open showcase. The purpose is to provide.

[0006]

The air conditioner of the present invention is used in a store where an open showcase is installed, and communicates between a floor near the open showcase and an air conditioner provided in the store. A case-side duct, and a load-side duct that connects the ceiling and the air conditioner corresponding to a location with a large cooling load in a store, and the air conditioner blower forms an airflow that passes between the ducts. It is.

In addition to the above, the air conditioner according to the second aspect of the present invention forms an airflow from the showcase side duct to the load side duct when the air conditioner is being cooled, and also forms the airflow from the load side duct to the showcase side when the air conditioner is being heated. It forms an airflow to the duct.

According to the present invention, in a store in which an open showcase is installed, a showcase-side duct that communicates a floor near the open showcase with an air conditioner provided in the store, and a cooling load in the store. And a load-side duct communicating the air conditioner with a ceiling portion corresponding to a large area of the air conditioner, and an air flow across each duct is formed by a blower of the air conditioner. By forming an airflow from the showcase side duct to the load side duct during cooling of the air conditioner, the cool air that overflows from the open showcase is transported to a location with a large cooling load in the store and flows down from the ceiling. Air from the load side duct to the showcase side duct at the time of heating, so that the warm air in the ceiling can be It is possible to convey to the floor in the vicinity.

[0009] This makes it possible to lower the temperature of a location where the cooling load is large in the store during cooling in summer or the like, and to raise the temperature of the floor near the open showcase during heating in winter or the like. As a result, it is possible to effectively cool the vicinity of the cash register where the temperature becomes high, and conversely, in the vicinity of the open showcase, it is possible to effectively eliminate the cooling of the customer's feet and improve the air conditioning performance in the store. In addition, power consumption of the air conditioner can be reduced, which contributes to energy saving.

An air conditioner according to a third aspect of the present invention, in addition to the above, is configured to exchange the airflow flowing through the showcase side duct and the load side duct with a heat exchanger of an air conditioner.

According to the third aspect of the present invention, in addition to the above, the airflow flowing through the showcase side duct and the load side duct is
Because we exchanged heat with the heat exchanger of the air conditioner,
The cool air from the showcase side duct can be further cooled by the heat exchanger of the air conditioner, or the warm air from the load side duct can be further heated by the heat exchanger of the air conditioner. It is possible to further improve the energy saving effect.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of the air conditioner of the present invention. The air conditioner of the present invention includes, for example, an air conditioner 1 mounted on a ceiling for air-conditioning a sales floor 3 of a store 2 such as a supermarket, and a plurality of low-temperature showcases 4 installed in the store 2.・ It is composed of The air conditioner 1 controls the indoor temperature by cooling or heating the inside of the store 2.

The low-temperature showcase 4 is an open show that freezes or refrigerates the products displayed by the cool air cooled by the cooler 30 disposed therein, and forms an air curtain at the opening 6 for storing and removing the products. Case.
Further, a ventilation port 7 is formed in a lower part of the front surface of the low-temperature showcase 4.

In the figure, reference numeral 8 denotes a cold aisle formed by cold air which overflows from the opening 6 of the low-temperature showcase 4 and stays in front of the low-temperature showcase 4.

A floor duct 9 and a wall duct 10 are formed on the floor of the low-temperature showcase 4 and the wall of the store 2 adjacent to the low-temperature showcase.
Has one end communicating with the ventilation port 7, and the other end of the floor duct 9 communicates with one end of the wall surface duct 10. Branch connectors 14 having openings in three directions are connected to both ends of the air conditioner 1 installed on the ceiling of the store 2.

The other end of the wall duct 10 is connected to one end of a ceiling duct 11 provided on the ceiling of the store 2. An electromagnetic damper 15 is connected to the other end of the ceiling duct 11. Installed. One outlet of the damper 15 is connected to a duct 45.
The other end of 5 is connected to a branch connector 14 connected to the low-temperature showcase side of the air conditioner 1.

At the other exit of the damper 15,
One end of the branch duct 13 is connected, and the other end of the branch duct 13 is connected to a branch connector 14 connected to the load side of the air conditioner 1. The electromagnetic damper 15 is controlled by a control device (not shown). The showcase-side duct D1 is constituted by the ducts 9, 10, 11, 45, 13, and the like.

On the other hand, an area in the store 2 where the cooling load is large,
For example, a plurality of air vents 51 are provided on a cash register (checkout counter) R, a non-cooled shelf for displaying food and daily necessities which do not require cooling, and a ceiling portion corresponding to an area where a gondola is installed. Is formed. One end of the vent 51 is communicated with one end of the ceiling duct 12 provided on the ceiling in the store 2.

At the other end of the ceiling duct 12, an electromagnetic three-way valve 16 similar to that described above is attached, and one outlet is connected to a duct 46 connected to the load side of the air conditioner 1. Have been. The other end of this duct 46
It is connected to a branch connector 14 attached to the load side of the air conditioner 1. One end of a branch duct 17 is connected to the other outlet of the three-way valve 16. The other end of the branch duct 17 is connected to a branch connector 14 connected to the low temperature showcase side of the air conditioner 1.

Incidentally, the three-way valve 16 also has the damper 15 described above.
In the same manner as described above, it is controlled by a control device (not shown).
The ducts 12, 46, 17 and the like constitute a load side duct D2.

Next, the air conditioner 1 will be described. In the air conditioner 1, a blower 23, a cooler 18, and a heater 22 using hot gas discharged from the compressor 19 are provided in order from the one closer to the showcase side duct D1. The cooling device of the air conditioner 1 includes a compressor 19, a condenser 21,
It comprises a receiver tank 20, an expansion valve 47, a cooler 18, a heater 22, and a heat storage tank 24. Water is stored in the heat storage tank 24.

The refrigerant pipe 19A on the outlet side of the compressor 19 is
The refrigerant pipe 25A on one outlet side of the three-way valve 25 is connected to the condenser 21. The refrigerant pipe 21A on the outlet side of the condenser 21 is connected to the receiver tank 20. It is connected to the.
The refrigerant pipe 20A on the outlet side of the receiver tank 20 is connected to the inlet of a three-way valve 26 as a flow path switching device,
The refrigerant pipe 26A on one outlet side of the three-way valve 26 is connected to the refrigerant pipe 24A in the heat storage tank 24 via the electromagnetic valve 42 and the expansion valve 50.

The refrigerant pipe 24 passing through the heat storage tank 24
A is connected to the compressor 19 via a refrigerant pipe 19B on the suction side of the compressor 19. As a result, an annular refrigerant circuit is formed.

A pipe 25B on the other outlet side of the three-way valve 25 is connected to the heater 22. A refrigerant pipe 22A on the outlet side of the heater 22 is connected to a refrigerant pipe 25A via a check valve 27. It is connected. The check valve 27 has the refrigerant pipe 25A side in the forward direction. Further, the refrigerant pipe 26B on the other outlet side of the three-way valve 26 is connected to the cooler 18 via an electromagnetic valve 41 and an expansion valve 47, and the refrigerant pipe 18A on the outlet side of the cooler 18 connects the heat storage tank 24. Outgoing refrigerant pipe 2
4A.

Next, a plurality of low-temperature showcases 4... Installed in the store 2 will be described. This embodiment will be described using two low-temperature showcases 4 and 4. The cooling devices for these low-temperature showcases 4 and 4 include the coolers 30 and 30 for cooling the inside of the low-temperature showcases 4 and 4 and compressors 31 and 31 that constitute a known refrigeration cycle. Condensers 32, 32, receiver tanks 33, 33, liquid tube subcooling heat exchangers 34, 34
, A waste heat recovery heat exchanger 35, 35 and the heat storage tank 24.

The discharge sides of the compressors 31, 31 constituting the refrigerant circuits of the low-temperature showcases 4, 4 are connected to the inlets of three-way valves 36, 36 as flow switching devices. Are connected to the refrigerant pipes 36A, 36A.
A, and then the condensers 32, 32, the receiver tanks 33, 33, the liquid tube subcooling heat exchangers 34, 34,
The solenoid valves 43, 43 are connected to the coolers 30, 30 via expansion valves 48, 48. The outlets of the coolers 30, 30 are connected to the compressors 31, 31 via pipes 31B, 31B on the suction side of the compressors 31, 31, respectively.
As a result, an annular refrigerant circuit is formed.

The other outlet pipes 36B, 36B of the three-way valves 36, 36 are connected to the waste heat recovery heat exchangers 35, 3B.
The refrigerant pipes 35A, 35A connected to the refrigerant pipe 5 and exiting the waste heat recovery heat exchangers 35, 35 are connected to the refrigerant pipes 36A, 36A via check valves 37, 37.

On the other hand, a circulating water pipe 38 is drawn out of the heat storage tank 24. The circulating water pipe 38 is connected to the waste heat recovery heat exchanger via solenoid valves 40, 40, 40, and 40, respectively. 35, 35 and the liquid tube subcooling heat exchangers 34, 34 are drawn into the heat exchangers 35, 35,
34, and are disposed so as to exchange heat with the refrigerant pipes in 34. A pump 39 is interposed in the circulating water pipe 38, and the pump 39 is operated to supply water in the heat storage tank 24 to the heat exchangers 35, 35, and 3 by the circulating water pipe 38.
Cycle to 4,34.

Electromagnetic valves 40 are attached to the inlets of the heat exchangers, and are controlled by a control device (not shown).

Next, with reference to FIG. 1, the operation of the air conditioner 1 and the low-temperature showcase 4 of the present invention will be described.
Heating (winter) and mid-season business hours are explained separately.
First, the operation during the cooling period (summer season) and the nighttime in the middle season will be described.

The cooling device of the air conditioner 1 switches the three-way valve 25 connected to the refrigerant pipe 19A to the refrigerant pipe 25A side, and switches the three-way valve 2 connected to the refrigerant pipe 20A.
6 is switched to the refrigerant pipe 26A side. Also, the solenoid valve 41
Is closed and the solenoid valve 42 is open. Thereby, when the compressor 19 is operated, the gas refrigerant discharged from the compressor 19 flows into the condenser 21 because the three-way valve 25 is switched to the refrigerant pipe 25A side, where it is air-cooled and radiates heat. The refrigerant is condensed and liquefied, and the refrigerant is temporarily stored in the receiver tank 20.

The liquid refrigerant flowing out of the receiver tank 20 is depressurized by the expansion valve 47 through the solenoid valve 42 and then to the heat storage tank 24 because the three-way valve 26 is switched to the refrigerant pipe 26A. It flows in and exerts a cooling action to cool the water in the heat storage tank 24. Note that the refrigerant that has exited the cooling tank 24 is drawn into the compressor 19 via refrigerant pipes 24A and 19B. Thereby, the ice in the heat storage tank 24 is cooled at night.
Further, only the solenoid valves 40 of the heat exchangers 35, 35 are opened, the pump 39 is operated, and the water in the heat storage tank 24 is circulated to the respective heat exchangers 35, 35 by the circulating water pipe 38.

Since the three-way valve 36 is switched to the refrigerant pipe 36A, the refrigerant discharged from the compressor 31 of the cooling device of the low-temperature showcase 4 is a condenser 32, a receiver tank 33, and a liquid pipe. Cooling heat exchanger 34
Sequentially. Then, since the electromagnetic valve 43 is open, the cooling effect is exerted by the cooler 30 installed in the low-temperature showcase 4 through the expansion valve 48, and then returned to the compressor through the pipe 31B.

Next, the operation during cooling (in summer) during business hours will be described. The cooling device of the air conditioner 1 includes the refrigerant pipe 19
The three-way valve 25 connected to A is switched to the refrigerant pipe 25A, and the three-way valve 26 connected to the refrigerant pipe 20A is switched to the refrigerant pipe 26B. Further, the solenoid valve 41 is also opened. Thereby, when the compressor 19 is operated, the gas refrigerant discharged from the compressor 19 is supplied to the three-way valve 25.
Is switched to the refrigerant pipe 25A side, flows into the condenser 21, where it is cooled by air, radiates heat to be condensed and liquefied, and the refrigerant is temporarily stored in the receiver tank 20.

The liquid refrigerant that has exited the receiver tank 20 is depressurized by the expansion valve 47 via the solenoid valve 41 because the three-way valve 26 has been switched to the refrigerant pipe 26B. Flows into the cooler 18 in the air conditioner 1 installed in the air conditioner 1 and evaporates there. At this time, the cooler 18 exerts a cooling function to cool the air flowing into the air conditioner 1. The refrigerant that has exited the cooler 18 is the refrigerant pipe 1
It is sucked into the compressor 19 via 8A and 19B.

The refrigerant discharged from the compressor 31 of the cooling device of the low-temperature showcase 4 is supplied to the condenser 3 because the three-way valve 36 is switched to the refrigerant pipe 36A.
2. Pass through the receiver tank 33 and the heat exchanger 34 for subcooling of the liquid tube in order. Then, since the electromagnetic valve 36 is open, the cooling effect is exerted by the cooler 30 installed in the low-temperature showcase 4 through the expansion valve 48 and then returned to the compressor through the pipe 31B.

Since the solenoid valves 40 of the liquid tube subcooling heat exchangers 34, 34 are opened and the pump 39 is operated, the water cooled in the heat storage tank 24 at the time of the above-mentioned cooling operation is reduced. After flowing into the circulating water pipe 38, the heat exchanger 3
4 and 34, and exchanges heat with the high-temperature refrigerant flowing through the refrigerant pipes in the heat exchangers 34 and 34. That is, the water cooled by the nighttime power assists the cooling of the low-temperature showcase 4 in the daytime, and promotes the leveling of the power.

On the other hand, the air flow path between the showcase side duct D1 and the load side duct D2 is
The damper 15 attached to 1 is switched to the duct 45 side by a control device (not shown). Then, the three-way valve 16 attached to the load side duct D2 is switched to the duct 46 side by a control device (not shown).

The cold aisle 8 generated in front of the low-temperature showcase 4 in the store 2 by the cooling described above is blown by the blower 23 installed in the air conditioner 1.
Is sucked into the ventilation opening 7 formed at the lower part of the front of the floor, and the floor duct 9, wall duct 10,
Since the damper 15 is switched to the duct 45 through the ceiling duct 11, the damper 15 flows into the duct 45,
The air flows into the air conditioner 1 through the branch connector 14 on the low-temperature showcase side.

Cold aisle 8 flowing into air conditioner 1
Is cooled by the cooler 18 which has a cooling function as described above via the blower 23. Then, it flows into the duct 46 via the branch connector 14 on the load side. Here, since the three-way valve 16 is switched to the duct 46 side, it flows into the ceiling duct 12 of the load side duct D2,
Are discharged from the ventilation holes 51 formed in the ceiling portion of the vehicle.

Thus, the cold aisle 8 overflowing from the low-temperature showcase 4 is directly conveyed to the cashier R where the cooling load is high in the store 2 or to the shelf above which the food or the like that does not require cooling is displayed. , Can flow down directly from the ventilation holes 51 formed in the ceiling.

Accordingly, the vicinity of the cash register R where the temperature rises in the store 2 is effectively cooled, and conversely, in the vicinity of the low-temperature showcase 4, the cooling of the customer's feet is effectively eliminated and the air conditioning performance in the store 2 is improved. Can be improved. Further, since the air conditioner is performed by using the cool air staying in front of the low-temperature showcase 4, the power consumption of the air conditioner can be reduced, which contributes to energy saving.

Next, the operation during heating (in winter) will be described with reference to FIG. In the air flow path between the showcase side duct D1 and the load side duct D2, the damper 15 attached to the showcase side duct D1 is switched to the branch duct 13 side by a control device (not shown). Then, the three-way valve 16 attached to the load side duct D2 is switched to the branch duct 17 side by a control device (not shown).

The cooling device of the air conditioner 1 switches the three-way valve 25 connected to the refrigerant pipe 19A to the refrigerant pipe 25B. Thereby, when the compressor 19 is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor 19 is supplied to the three-way valve 2.
Since 5 has been switched to the refrigerant pipe 25B side, it flows into the heater 22, where it exerts a heating action. And
The refrigerant exiting the heater 22 is supplied to the refrigerant pipe 22A and the check valve 27.
, Flows into the condenser 21 from the refrigerant pipe 25 </ b> A, where it is air-cooled and radiates heat, and the refrigerant is temporarily stored in the receiver tank 20.

The liquid refrigerant that has flowed out of the receiver tank 20 is depressurized by the expansion valve 47 via the solenoid valve 42 because the three-way valve 26 has been switched to the refrigerant pipe 26A, and then transferred to the heat storage tank 24. It flows in and exerts a cooling action to cool the water in the heat storage tank 24. Note that the refrigerant that has exited the cooling tank 24 is drawn into the compressor 19 via refrigerant pipes 24A and 19B. Thereby, the ice in the heat storage tank 24 is cooled. Also,
Only the solenoid valves 40 of the heat exchangers 35, 35 are opened and the pump 3
9 is operated to circulate the water in the heat storage tank 24 to the respective heat exchangers 35 by a circulating water pipe 38.

As described above, warm air is blown out by the blower 23 installed in the air conditioner 1 from the plurality of ventilation ports 51 formed above the area where the register R and shelves displaying foods and the like that do not require cooling are located. This warm air is sucked and the ventilation holes 51
Since the three-way valve 16 has been switched to the branch duct 17 through the ceiling duct 12 of the load-side duct D2, the three-way valve 16 flows into the branch duct 17, and the load-side branch connector 14
Flows into the air conditioner 1 via the

The warm air flowing into the air conditioner 1 is
After passing through 3, heating is performed by the heater 23 exhibiting the heating action as described above. Then, it flows into the branch duct 13 via the branch connector 14 on the low-temperature showcase side. Here, since the damper 15 is switched to the branch duct 17 side, it flows into the ceiling duct 11 of the showcase-side duct D1, passes through the wall surface duct 10, and the floor surface duct 9, and is discharged from the ventilation opening 7.

Thus, the warm air from the ceiling near the cash register R can be conveyed to the floor near the low-temperature showcase 4. For this reason, the temperature of the floor near the low-temperature showcase 4 can be increased, and in the vicinity of the low-temperature showcase 4, the cooling of the customer's feet can be effectively eliminated to improve the air conditioning performance in the store 2. can do. In addition, since the air conditioner is performed by using the warm air retained in the ceiling, power consumption of the air conditioner can be reduced, which contributes to energy saving.

On the other hand, since the three-way valve 36 is switched to the refrigerant pipe 36B, the refrigerant discharged from the compressor 31 of the cooling device of the low-temperature showcase 4... After passing through the valve 37, the condenser 3
2. Pass through the receiver tank 33 and the heat exchanger 34 for subcooling of the liquid tube in order. Then, since the electromagnetic valve 36 is open, the cooling effect is exerted by the cooler 30 installed in the low-temperature showcase 4 through the expansion valve 48 and then returned to the compressor through the pipe 31B.

In this case, since the pump 39 is operated, the water cooled in the heat storage tank 24 flows into the circulating water pipe 38, and the waste heat recovery heat exchangers 35, 35
Since the electromagnetic valves 40, 40 are opened, the waste heat recovery heat exchangers 35, 35 are cooled, and the heat exchangers 35, 3 are cooled.
Heat exchange is performed with the high-temperature refrigerant flowing through the refrigerant pipe in 5. That is, also in this case, the cooling of the low-temperature showcase 4 is assisted by the water cooled by the electric power for heating, and the leveling of the electric power is promoted.

Next, during business hours in the middle season when dehumidification is required, the air flow path of the showcase side duct D1 and the load side duct D2 is changed by the damper 15 attached to the showcase side duct D1 as in the case of heating. Is switched to the branch duct 13 side by a controller (not shown). Then, the three-way valve 16 attached to the load side duct D2 is switched to the branch duct 17 side by a control device (not shown).

The cooling device of the air conditioner 1 switches the three-way valve 25 connected to the refrigerant pipe 19A to the refrigerant pipe 25B and switches the three-way valve 26 to the refrigerant pipe 26B. Thereby, when the compressor 19 is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor 19 is supplied to the three-way valve 25.
Is switched to the refrigerant pipe 25B side, so that it flows into the heater 22, where it exerts a heating action. Then, the refrigerant that has exited the heater 22 flows into the condenser 21 from the refrigerant pipe 25A via the refrigerant pipe 22A and the check valve 27, where it is air-cooled and radiates heat, and the refrigerant is discharged to the receiver tank 2A.
It is temporarily stored at 0.

The liquid refrigerant flowing out of the receiver tank 20 is depressurized by the expansion valve 47 through the solenoid valve 41 because the three-way valve 26 is switched to the refrigerant pipe 26B. Flows into the cooler 18 in the air conditioner 1 installed in the air conditioner 1 and evaporates there. At this time, the cooler 18 exerts a cooling function to cool the air flowing into the air conditioner 1. The refrigerant that has exited the cooler 18 is the refrigerant pipe 1
It is sucked into the compressor 19 via 8A and 19B. The dehumidifying operation is performed by both the heating of the heater 22 and the cooling action of the cooler 18.

As described above, a plurality of ventilation holes 51 formed above an area where shelves displaying foods and the like which do not require cooling are provided by the blower 23 installed in the air conditioner 1. Warm air is sucked in, and this air flows from the ventilation port 51 to the ceiling duct 12 of the load side duct D2.
, The three-way valve 16 is switched to the branch duct 17 side, so that it flows into the branch duct 17 and flows into the air conditioner 1 via the branch connector 14 on the load side.

The air flowing into the air conditioner 1 is
After passing through No. 3, it is heated by the heater 23 and cooled by the cooler 28. And the branch connector 1 on the low-temperature showcase side
4 flows into the branch duct 13. Here, since the damper 15 is switched to the branch duct 17 side, it flows into the ceiling duct 11 of the showcase-side duct D1, passes through the wall surface duct 10, and the floor surface duct 9, and is discharged from the ventilation opening 7.

Thus, after the relatively warm air on the ceiling near the cash register R is dried, it can be conveyed to the floor near the low-temperature showcase 4. For this reason, the temperature of the floor near the low-temperature showcase 4 can be increased, and in the vicinity of the low-temperature showcase 4, the cooling of the customer's feet can be effectively eliminated to improve the air conditioning performance in the store 2. can do. In addition, since the air remaining on the ceiling is supplied after being dried, the occurrence of dew condensation around the low-temperature showcase 4 can be suppressed.

On the other hand, since the three-way valve 36 is switched to the refrigerant pipe 36A, the refrigerant discharged from the compressor 31 of the cooling device of the low-temperature showcase 4 is a condenser 32, a receiver tank 33, and a liquid pipe. It passes through the subcooling heat exchanger 34 in order. Then, since the electromagnetic valve 36 is opened, the cooling operation is performed by the cooler 30 installed in the low-temperature showcase 4 through the expansion valve 48, and then the piping 31B
And returns to the compressor.

Further, since the solenoid valves 40 of the heat exchangers 34, 34 for opening and cooling the liquid tubes are opened and the pump 39 is operated, the water cooled in the heat storage tank 24 at the time of the above-mentioned cooling operation can be obtained. After flowing into the circulating water pipe 38, the heat exchanger 3
4 and 34, and exchanges heat with the high-temperature refrigerant flowing through the refrigerant pipes in the heat exchangers 34 and 34. That is, the water cooled by the nighttime power assists the cooling of the low-temperature showcase 4 in the daytime, and promotes the leveling of the power.

[0059]

As described above in detail, according to the present invention, in a store in which an open showcase is installed, a showcase side duct for communicating a floor portion near the open showcase with an air conditioner provided in the store. And a load side duct communicating the air conditioner with a ceiling corresponding to a location with a large cooling load in the store, and the air conditioner blower forms an air flow across each duct. ,
By forming an airflow from the showcase side duct to the load side duct during cooling of the air conditioner as in claim 2, the cool air overflowing from the open showcase is conveyed to a location in the store where the cooling load is large, and the ceiling is cooled. Air from the load-side duct to the showcase-side duct during heating, so that warm air from the ceiling can be transferred to the floor near the open showcase. .

This makes it possible to lower the temperature of a location having a large cooling load in the store during cooling in summer or the like, and to raise the temperature of the floor near the open showcase during heating in winter or the like. As a result, it is possible to effectively cool the vicinity of the cash register where the temperature becomes high, and conversely, in the vicinity of the open showcase, it is possible to effectively eliminate the cooling of the customer's feet and improve the air conditioning performance in the store. In addition, power consumption of the air conditioner can be reduced, which contributes to energy saving.

According to the third aspect of the present invention, in addition to the above, the airflow flowing through the showcase side duct and the load side duct is
Because we exchanged heat with the heat exchanger of the air conditioner,
The cool air from the showcase side duct can be further cooled by the heat exchanger of the air conditioner, or the warm air from the load side duct can be further heated by the heat exchanger of the air conditioner. It is possible to further improve the energy saving effect.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner apparatus of the present invention.

FIG. 2 is a diagram illustrating the flow of air during heating of the air-conditioning apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Store 3 Sales floor 4 Showcase 7, 51 Ventilation opening 8 Cold aisle 9 Floor duct 10 Wall duct 11, 12 Ceiling duct 13, 17 Branch duct 14 Branch connector 15, 16 Damper 18 Cooler 22 Heating Container 23 Blower 45, 46 Duct D1 Showcase side duct D2 Load side duct R Cash register

Claims (3)

[Claims] 1. A store where an open showcase is installed, a showcase-side duct that communicates a floor near the open showcase with an air conditioner provided in the store, and a large cooling load in the store. An air conditioner, comprising: a load-side duct that communicates with a ceiling corresponding to a location and the air conditioner; wherein a blower of the air conditioner forms an airflow between the ducts. 2. An air flow from the show case side duct to the load side duct is formed during cooling of the air conditioner, and an air flow is formed from the load side duct to the show case side duct during heating. The air conditioner according to claim 1, wherein: 3. The air conditioner according to claim 1, wherein the airflow flowing through the showcase side duct and the load side duct exchanges heat with a heat exchanger of the air conditioner.