JPH0548039Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an air conditioning system for a store that eliminates the cold aisle formed near the floor in front of an open store case.

(Prior art) Generally, the inside of a store is maintained at an appropriate temperature by an air conditioning circuit such as a heat pump type air conditioning circuit, but when an open store case is installed in the store, Cold air leaks and collects near the floor, forming a so-called cold aisle. Therefore, the feet of shoppers tend to be cooled by this cold aisle.

To prevent this situation, the condensed waste heat from the cooling circuit of the open show case is sent to a reheating unit installed above the open show case, and the heat generated by this reheating unit is transferred to the open show case. Air is blown out to the front of the open case through the back ventilation duct, eliminating cold aisles (Utility Model Publication No. 147630/1983).

(Problem to be solved by the invention) In such a store air conditioner, when the cooling circuit of the open show case is operating, hot air is blown out from the reheating unit at the same time; When the is not operating, hot air cannot be blown out and cold aisles cannot be eliminated. Therefore, in winter, the operating rate of open-shock cases decreases, so
There was a problem in that the formation of a cold aisle was significant, causing discomfort to shoppers.

The purpose of the present invention is to provide an air conditioning system for a store that can eliminate the cold aisle formed in front of an open show case, regardless of how the open show case is driven. be.

(Means for Solving the Problems) In order to solve the above problems, the present invention is based on claim (1).
The idea is to switch the refrigerant discharged from the compressor to the indoor unit or outdoor unit using a four-way valve.
A heat pump type air conditioning circuit that cools and heats the store, a cooling circuit for the open show case installed in the store, and a system that sucks in cold air from the lower front of the open show case and heats it, or heats the heated air. In a store air conditioner equipped with a reheating unit that supplies air to the lower front of an open show case, heat exchange of the reheating unit is performed between the discharge side of the compressor of the heat pump type air conditioning circuit and the four-way valve. It is characterized by connecting a device.

The invention of claim (2) is a water circuit that has two water heat exchangers and circulates water or brine between each water heat exchanger using a pump in the store air conditioner according to claim (1). characterized in that the one water heat exchanger is connected to the heat exchanger side of the outdoor unit of the heat pump type air conditioning circuit, and the other water heat exchanger is connected to the discharge side of the compressor in the cooling circuit. shall be.

The invention of claim (3) is, in the store air conditioner according to claim (1), in which the heat exchanger side of the outdoor unit in the heat pump type air conditioning circuit and the discharge side of the compressor in the cooling circuit are brought into thermal contact. It is characterized by being provided with a refrigerant-refrigerant heat exchanger.

(Function) According to the invention of claim (1), since the heat exchanger of the reheating unit is connected between the discharge side of the compressor of the heat pump type air conditioning circuit and the four-way valve, the heat exchanger of the reheating unit is connected between the discharge side of the compressor of the heat pump air conditioning circuit and the four-way valve. The high temperature refrigerant exchanges heat in the heat exchanger of this reheating unit. As a result, cold air taken in from the lower front of the open show case is heated, or warm air can be blown out to the lower front of the open show case.

According to the invention of claim (2), the exhaust heat from the cooling circuit of the open store case is supplied to the heat pump type air conditioning circuit via the water circuit, thereby improving the heating capacity within the store.

According to the invention of claim (3), the exhaust heat from the cooling circuit of the open store case is directly supplied to the heat pump type air conditioning circuit via the refrigerant-refrigerant heat exchanger, thereby improving the heating capacity in the store.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which FIG. 1 is a circuit diagram of an air conditioner for a store, and FIG. 2 is a diagram showing how the unit is installed in a store.

In the figure, 1 is a store, 10 is a heat pump type air conditioning circuit (hereinafter referred to as an air conditioning circuit) that performs heating and cooling in the store 1, 20 is an open show case, 30 is a cooling circuit of the open show case 20, and 40 is an exhaust of the cooling circuit 30. a water circuit supplying heat to the air conditioning circuit 10;
50 is a reheating unit.

In this air conditioning circuit 10, the discharge side of the compressor 12 is connected to the first port 11a of the four-way valve 11, and the suction side of the compressor 12 is connected to the second port 11b via the accumulator 13. Furthermore, an air heat exchanger 51 of a reheating unit 50 is connected between the compressor 10 and the first port 11a.

This reheating unit 50 is installed above the ceiling 2 of the store 1. This reheating unit 50 is equipped with a Shirotsuko fan 52, and has an intake duct 53 and a blow-off duct 54. The intake duct 53 sucks air near the ceiling 2 inside the store 1, and furthermore, this air is The air is blown out to the rear ventilation passage 21 of the open show case 20 by the air duct 54, and this air is blown out to the front of the open show case 20 (cold aisle A).
side).

Further, the third port 11c of the four-way valve 11 of the air conditioning circuit 10 is connected to the expansion valves 14a, 14 arranged in parallel.
It is connected to one end of b. This third port 11c
An air heat exchanger 15a of the outdoor unit 15 and one water heat exchanger 41 of the water circuit 40 are connected in parallel between the expansion valves 14a and 14b. Furthermore, this air heat exchanger 15a has an axial flow fan 15b.
Heat exchange control is performed by on/off control. Note that check valves 16a and 16b regulate the flow of refrigerant to each expansion valve 14a and 14b, respectively.

Furthermore, the fourth port 11d of the four-way valve 11 of the air conditioning circuit 10 is connected to the other end of each expansion valve 14a, 14b. This fourth port 11d and each expansion valve 14
An air heat exchanger 17a of the indoor unit 17 and a bypass pipe 18 are connected in parallel between the air heat exchangers 17a and 14b. Further, solenoid valves 19a and 19b are arranged at the inlet and outlet sides of the air heat exchanger 17a, and a solenoid valve 19 is arranged at the fourth port 11d side of the bypass pipe 18.
c is placed.

This indoor unit 17 is installed on the ceiling 2 of the store 1, and has a ceiling diffuser 17b that sucks in the air inside the store 1 from the center and blows out the air that has been heat-exchanged with an air heat exchanger 17a from its periphery. ing.

The cooling circuit 30 connects from the discharge side of the compressor 31 to the other water heat exchanger 42 of the water circuit 40, the air heat exchanger (condenser) 32a of the outdoor unit 32, the expansion valve 33, and It is sequentially connected to an evaporator 34 and an accumulator 35.

The water circuit 40 has water heat exchangers 41 and 42 and a circulation pump 43, and by circulating water or brine between the water heat exchangers 41 and 42, exhaust heat from the cooling circuit 30 is transferred to the air conditioning circuit 10. supplying.

According to this embodiment, the open show case 20
When driving the cooling circuit 30, the refrigerant of the compressor 31 flows through the water circuit 4 as shown by the broken line arrow in FIG.
The product inside the open show case 20 is cooled by circulating as follows: water heat exchanger 42 of the outdoor unit 32 → air heat exchanger 32a of the outdoor unit 32 → expansion valve 33 → evaporator 34 → accumulator 35 → compressor 31.

When performing store air conditioning in the summer, open the solenoid valves 19a and 19b of the air conditioning circuit 10, and close the solenoid valve 19.
c is opened, the axial flow fan 14b is turned on, and the compressor 1 is turned on.
2, and the water circuit 40 turns off its circulation pump 43. As a result, the refrigerant in the compressor 12 is transferred from the air heat exchanger 51 of the reheating unit 50 to the four-way valve 11 to the air heat exchanger 15a of the outdoor unit 15 and the water circuit 4 as shown by the solid arrow in FIG.
0 water heat exchange 41 → expansion valve 14a → check valve 16a
→ Solenoid valve 19b → air heat exchanger 17a of indoor unit 17 → solenoid valve 19a → four-way valve 11 → accumulator 13 → compressor 12.

Here, the air heat exchanger 5 of the reheating unit 50
Since heat dissipation is performed in duct 1, suction duct 5
The store air sucked into the reheating unit 50 is heated within the reheating unit 50. This hot air is blown out to the front of the open show case 20 via the blowout duct 54 and the back ventilation passage 21, and is
Eliminate.

In addition, through this operation, the interior of the store 1 is cooled by the indoor unit 17, and the dehumidifying action of this indoor unit 17 and the heating action of the reheating unit 50 produce a drying effect on the air in the store, making it comfortable. Air conditioning can be provided.

When performing store air conditioning in winter, open the solenoid valves 19a and 19b of the air conditioning circuit 10, and close the solenoid valve 1.
9c is closed, the axial flow fan 15b is turned on to drive the compressor 12, and the circulation pump 4 of the water circuit 40 is turned on.
Turn on 3. As a result, the refrigerant in the compressor 12 flows as shown by the two-dot chain arrow in FIG. → Check valve 16b → Air heat exchanger 15a and water heat exchanger 41 → Four-way valve 11 → Accumulator 13 → Compressor 12.

Here, as in the cooling mode, the reheating unit 5
Since heat dissipation is performed at 0, cold aisle A is eliminated. In addition, indoor unit 17
Since the heat dissipation effect is also performed in the store, the inside of the store is heated.

In addition, in this heating mode, in the water circuit 40, as shown by the white arrows in FIG.
Since water is circulated between the cooling circuits 1 and 42, exhaust heat from the cooling circuit 30 is supplied to the air conditioning circuit 10 via the water circuit 40. Therefore, this water heat exchanger 41
The heat absorption action of the air conditioning circuit 10 is performed in the air conditioning circuit 1, and together with the heat absorption action of the outdoor unit 15
0 thermal efficiency is improved.

When performing air conditioning in the store during the intermediate seasons such as spring and autumn, the solenoid valves 19a and 19b are closed, the solenoid valve 19c is opened, the axial fan 15b is turned off, the compressor 12 is driven, and the water circuit 40 is turned off. circulation pump 4
Drive 3. As a result, the refrigerant in the compressor 12 is transferred to the air heat exchanger 51 → four-way valve 11 → bypass pipe 18 → solenoid valve 19c → expansion valve 14b → check valve 16b → air Heat exchanger 15a and water heat exchanger 41→four-way valve 11→
It circulates from the accumulator 13 to the compressor 12.

In this mode, as in the heating mode, water is circulated in the water circuit 40, so the water heat exchanger 41 absorbs heat, and this causes the cooling circuit 30 of the open show case 20 to The heat causes the reheating unit 50 to dissipate heat. Here, when this exhaust heat is insufficient (low operating rate of the cooling circuit 30), this shortage can be sufficiently compensated for by turning on the axial flow fan 15b.

FIG. 3 is a circuit configuration diagram of a main part of another embodiment, and shows an example in which a refrigerant-refrigerant heat exchanger 60 for exchanging heat between the air conditioning circuit 10 and the cooling circuit 30 is provided in place of the water circuit 40. It shows. This refrigerant-refrigerant heat exchanger 60 is installed in parallel with the air heat exchanger 15a of the air conditioning circuit 10 and on the discharge side of the compressor 31 of the cooling circuit 310, and is installed between the refrigerant flowing in each circuit 10, 30. It is designed to exchange heat.

According to this embodiment, the exhaust heat of the cooling circuit 30 is directly transferred to the air conditioning circuit 10 by the refrigerant-refrigerant heat exchanger 60. Note that the other configurations and operations are the same as those of the previous embodiment.

In the above embodiment, a case has been described in which hot air is blown from the reheating unit 50 toward the cold aisle A. However, it is also possible to reversely rotate the sirotsky fan 52 of the reheating unit 50 and draw in the air from the cold aisle A. Alternatively, the air may be blown out from the ceiling 2 side of the store 1.

(Effect of the invention) As explained above, according to the invention of claim (1), the heat dissipation function of the reheating unit can be performed by the heat pump type air conditioning circuit, regardless of whether the open shower case is driven. First, it has the advantage of being able to eliminate the cold aisle formed in front of the open show case.

According to the invention of claim (2), the exhaust heat of the cooling circuit of the open store case is supplied to the heat pump type air conditioning circuit via the water circuit, and there is an advantage that the heating capacity in the store is improved.

According to claim (3), the exhaust heat of the cooling circuit is directly transmitted to the heat pump type air conditioning circuit by the refrigerant-refrigerant heat exchanger, and the heating capacity in the store is improved.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a circuit diagram of a store air conditioner, Figure 2 is a diagram of how the unit is installed in a store, and Figure 3 is a diagram of other equipment. FIG. 2 is a circuit configuration diagram of main parts according to an embodiment of the present invention. In the figure, 1...store, 10...air conditioning circuit, 11...
... Four-way valve, 12, 31 ... Compressor, 15 ... Outdoor unit, 15a ... Air heat exchanger, 17 ... Indoor unit, 20 ... Open show case, 3
0...Cooling circuit, 40...Water circuit, 41, 42...
... Water heat exchanger, 43 ... Circulation pump, 50 ... Reheating unit, 51 ... Air heat exchanger, 60 ...
Refrigerant-refrigerant heat exchanger, A...cold aisle.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A heat pump air conditioning circuit that cools and heats a store by switching refrigerant discharged from a compressor to an indoor unit or an outdoor unit using a four-way valve, and an open system installed in a store. A store air conditioner equipped with a cooling circuit for the case and a reheating unit that sucks in cold air from the lower front part of the open show case and heats it, or supplies the heated air to the lower front part of the open show case. An air conditioner for a store, characterized in that a heat exchanger of the reheating unit is connected between the discharge side of the compressor of the heat pump type air conditioning circuit and the four-way valve. (2) It has a water circuit that has two water heat exchangers and circulates water or brine between each water heat exchanger using a pump, and one of the water heat exchangers is an outdoor unit of a heat pump type air conditioning circuit. 2. The store air conditioner according to claim 1, wherein the other water heat exchanger is connected to the discharge side of the compressor in the cooling circuit. (3) Claim (1) characterized in that a refrigerant-refrigerant heat exchanger is provided that brings the heat exchanger side of the outdoor unit in the heat pump type air conditioning circuit into thermal contact with the discharge side of the compressor in the cooling circuit. ) Store air conditioning equipment.