JP2005016917A - Integrated refrigerating/air-conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recover cool air leaking out of a refrigerating showcase and enhance energy efficiency in an integrated refrigerating/air-conditioning device with a compressor provided for an air conditioner and the refrigerating showcase in common. <P>SOLUTION: A reheating condenser 17 is provided in parallel with a condenser 10 common to the air conditioner 2 and the refrigerating showcase 5, and a dehumidifying evaporator 16 is provided to the latter part of an evaporator 7 of the refrigerating showcase 5 in series. The cool air 15 having leaked out of the refrigerating showcase 5 is dehumidified by the dehumidifying evaporator 16, and the leaked cool air 15 is heated by the reheating condenser 17 and blown out into a room. The dehumidified leaked cool air 15 is heated up to room temperature and blown out into the room to eliminate an uncomfortable feeling due to the leaked cool air 15 and reduce a load on the air conditioner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an integrated refrigeration / air-conditioning apparatus used in a store or the like where a showcase for refrigeration / freezing (hereinafter collectively referred to as “refrigeration”) preservation of food in an air-conditioned room is installed.
[0002]
[Prior art]
The refrigerant circuit of the refrigeration / air-conditioning apparatus used in the above-mentioned stores and the like is generally composed of an air-conditioner and a refrigerated showcase, and a compressor, a condenser, an evaporator, etc. are generally provided individually. It is. However, such a refrigeration / air-conditioning apparatus, for example, in the winter season, although the indoor heating load and the refrigeration load in the showcase are generated simultaneously in the same room, the exhaust heat of the refrigeration load is taken outside the room. On the other hand, it is wasteful to obtain the heat of the heating load from the outdoor air. Therefore, a refrigeration / air conditioning integrated device has been developed in which the refrigerant circuit of the air conditioner and the refrigerated showcase is integrated to share a compressor, and is disclosed in Patent Document 1 or Patent Document 2. According to this refrigeration / air conditioning integrated device, waste heat from the refrigerated showcase can be used as a heat source for the air conditioner, and indoor air can be used as a cold heat source for the refrigerated showcase. Since heat can be used mutually, thermal efficiency is increased.
[0003]
On the other hand, in a store where a refrigerated showcase is installed, there is a problem that the cold air leaking from the open showcase stays near the floor and cools the feet of the customers, and proper treatment of this cold air is also important .
[0004]
[Patent Document 1]
JP 2000-240980 A [Patent Document 2]
JP-A-2002-357374
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to improve the heat efficiency by integrating the refrigerant circuit of the air conditioner and the refrigerated showcase, collect cold air leaking from the refrigerated showcase, and simplify the refrigerant circuit at the same time. is there.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an air conditioning / cooling / air conditioning integrated apparatus in which a compressor is commonly provided for an air conditioner that cools and heats a room and a refrigerated showcase installed in the room. A reheat condenser is provided in parallel with the condenser common to the refrigerator and the refrigerated showcase, and the recooled condenser heats the leaked cold air leaking from the refrigerated showcase and blows it into the room. (Claim 1). According to the first aspect of the present invention, it is possible to heat the leaked cold air to the room temperature by the reheating condenser and blow it out into the room, thereby eliminating the discomfort caused by the leaked cold air and reducing the air conditioning load.
[0007]
In the first aspect of the present invention, a dehumidifying evaporator may be provided in series after the refrigerated evaporator of the showcase, and the leaked cold air may be dehumidified by the dehumidifying evaporator (invention 2). Thereby, the exhaust heat (cold heat) of the refrigeration evaporator can be effectively used to dehumidify the leaked cold air.
[0008]
In the invention of claim 1 or claim 2, it is preferable that outside air is mixed with the leaked cold air passing through the condenser for reheating (invention 3). Thereby, it is possible to reduce the load on the reheating condenser for heating the leaked cold air and heating the leaked cold air.
[0009]
In the invention of claim 1 or claim 2, the refrigerant condensed by the reheating condenser may be supplied to the refrigeration evaporator (invention 4). Thereby, indoor air can be used as a cold heat source for a refrigerated showcase, and at the same time, exhaust heat from the refrigerated showcase can be used as a heat source for air conditioning.
[0010]
In the invention of claim 4, the surplus of the refrigerant condensed by the reheat condenser can be evaporated by using a condenser common to the air conditioner and the showcase as an evaporator. ).
[0011]
In the invention of claim 1 or 2, the reheating condenser is also used as a heating condenser of the air conditioner (invention 6). In the invention of claim 2, the dehumidifying evaporator. Is also used as the cooling evaporator of the air conditioner (Claim 7), the refrigerant circuit is simplified.
[0012]
In the invention of claim 1 or claim 2, if the refrigerant on the inlet side of the refrigeration evaporator or the evaporator for air conditioning is heat-exchanged with the refrigerant on the outlet side, and the refrigerant on the inlet side is supercooled, The thermal efficiency is further increased by effectively using the exhaust heat (cold heat) of the low-temperature evaporative gas (claim 8).
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, FIG. 1 is a device layout diagram in a store showing the concept of a refrigeration / air conditioning integrated device. In FIG. 1, the interior of a store 1 such as a supermarket is air-conditioned by an air conditioner (indoor unit) 2, and the air conditioner 2 includes an evaporator (air conditioner evaporator) 3 and a ventilation fan 4. In this room, a refrigerated showcase (open showcase) 5 is installed, and merchandise (not shown) in the merchandise display chamber 6 is cooled by cold air circulating through an evaporator (refrigerator evaporator) 7. On the other hand, the outdoor unit 8 installed outside is provided with a common compressor 9, a condenser (common condenser) 10, and a blower fan 11 for the air conditioner 2 and the refrigerated showcase 5. A ventilation fan 12 is installed in one corner of the store 1, and an intake fan 13 and an exhaust fan 14 that allow outside air to flow are installed in the back of the ceiling. In FIG. 1, only one air conditioner 2 and refrigerated showcase 5 are shown, but a plurality of units can be grouped and connected in parallel to one outdoor unit 8.
[0014]
Here, above the refrigerated showcase 5, an evaporator (dehumidifying evaporator) 16 and a dehumidifier leaking from the refrigerated showcase 5 and dehumidifying the cool air (leaked cold air) 15 staying in the vicinity of the floor surface in front of it. A condenser (reheat condenser) 17 for heating the later leaked cold air 15 to room temperature is provided so as to overlap. In the vicinity of the back of the dehumidifying evaporator 16, a blower fan 18 that sucks the leaked cold air 15 is provided. At the same time, the blower fan 18 introduces outside air into the room through the damper 19 to positively pressure the room to a slightly higher pressure than the outside air. The leaked cool air 15 sucked by the blower fan 18 is mixed with the outside air introduced into the room and heated up, and then blown out into the room through the dehumidifying evaporator 16 and the reheating condenser 17.
[0015]
FIG. 2 is a refrigerant circuit diagram of the refrigeration / air conditioning integrated device of FIG. In FIG. 2, the refrigerant circuit includes a compressor 9, a common condenser 10, a receiver 20, an expansion valve 21, an air conditioning evaporator 3, an expansion valve 22, a refrigeration evaporator 7, an accumulator 23, and the like. The common condenser 10 and the receiver 20 are connected via a check valve 24, and an expansion valve 25 is provided in parallel with the check valve 24.
[0016]
Here, the compressor 9 is provided with a reheating condenser 17 in parallel with the common condenser 10, and the refrigerant outlet side is connected to the receiver 20. Further, a dehumidifying evaporator 16 is provided in series downstream of the refrigeration evaporator 7, and the refrigerant outlet side thereof is connected to the accumulator 23 in common with the air conditioning evaporator 3 and the refrigerant outlet side of the refrigeration evaporator 7. ing. The heat exchanger 26 is a gas-liquid heat exchanger that exchanges heat between the liquid refrigerant on the inlet side and the gas refrigerant on the outlet side of the air conditioning evaporator 3 and the refrigeration evaporator 7. Solenoid valves V1 to V7 are respectively inserted in the main points of such a refrigerant circuit. A part of the liquid refrigerant stored in the receiver 20 is sent to the compressor 9 via the injection expansion valve 27 by opening the electromagnetic valve V8, where it evaporates to cool the compressor 9. It has become. Then, the operation of this air conditioning / refrigeration integrated device will be described below for each operation mode. In addition, the thick line arrow in a refrigerant circuit diagram has shown the circulation path of the refrigerant | coolant.
[0017]
FIG. 3 shows the cooling operation mode. In FIG. 3, the solenoid valves V2 and V7 are open and the others are closed. The high-temperature and high-pressure gas refrigerant discharged from the compressor 9 is liquefied by exchanging heat with outdoor air in the condenser 10 and temporarily stored in the receiver 20. Is done. This liquid refrigerant passes through the heat exchanger 26, exchanges heat with the gas refrigerant on the outlet side of the air conditioning evaporator 3 and is supercooled, and then is decompressed by the expansion valve 21 and enters the air conditioning evaporator 3. Evaporates to cool the room air. The vaporized low-temperature and low-pressure gas refrigerant passes through the heat exchanger 26 and supercools the liquid refrigerant on the inlet side of the air-conditioning evaporator 3, and then returns to the compressor 9 after the liquid component is separated by the accumulator 23. Recompressed.
[0018]
FIG. 4 shows the refrigeration operation mode, in which the solenoid valves V2 and V5 are open, and the others are closed. The difference from the cooling operation of FIG. 3 is that the liquid refrigerant from the receiver 20 is depressurized by the expansion valve 22 and enters the refrigeration evaporator 7 and evaporates at a lower temperature and lower pressure than the cooling operation. Is the same.
[0019]
FIG. 5 shows an operation mode in which leaked cold air is dehumidified and reheated in the refrigeration operation and blown out into the room. The solenoid valves V1, V2, V4 and V6 are open, and the others are closed. In FIG. 5, the gas refrigerant at a low temperature, for example, −10 ° C. after being evaporated in the refrigeration evaporator 7 enters the dehumidifying evaporator 16 through the electromagnetic valve V <b> 6. Here, as shown in FIG. 1, the leaked cold air 15 leaked from the refrigerated showcase 5 is sucked by the blower fan 18 and mixed with the outside air, and then passed through the dehumidifying evaporator 16 and the reheating condenser 17. It is blown out indoors. By introducing the outside air into the room, the room is positively pressurized and dust and the like are prevented from entering the room from the outside. At the same time, the introduced outside air is cooled by mixing with the leaked cold air 15, and an increase in room temperature due to the high temperature outside air is suppressed. The leaked cold air 15 that has passed through the dehumidifying evaporator 16 is cooled and dehumidified by exchanging heat with a low-temperature gas refrigerant.
[0020]
On the other hand, a part of the high-temperature and high-pressure gas refrigerant discharged from the compressor 9 is sent to the reheating condenser 17 through the electromagnetic valve V1. The gas refrigerant is cooled and condensed by the leaked cold air 15 after being dehumidified by the reheating condenser 17, sent to the receiver 20, and evaporated together with the liquid refrigerant from the common condenser 10 by the refrigeration evaporator 7. To do. The leaked cold air 15 heated to room temperature by the reheating condenser 17 is blown out into the room as dry conditioned air. At that time, since the temperature of the leaked cold air 15 is increased by mixing with the outside air, the heating load of the reheating condenser 17 is reduced.
[0021]
According to the operation mode of FIG. 5, since the leaked cold air 15 staying on the floor surface is collected, the unpleasant feeling that the store customer's feet cool down is eliminated, and the leaked cold air is dehumidified and reheated and blown into the room. As a result, the air conditioning load in the store is reduced. Further, the dehumidifying evaporator 16 performs dehumidification using refrigerant sensible heat (cold heat) contained in the exhaust gas from the refrigeration evaporator 7, and the reheating condenser 17 condenses exhaust heat (hot heat) of the high-temperature high-pressure gas. ) To reheat, there is no waste of energy.
[0022]
FIG. 6 shows a cooling / refrigeration operation mode. In this operation mode, the cooling operation shown in FIG. 3 and the refrigeration operation shown in FIG. 4 are performed simultaneously.
[0023]
FIG. 7 shows an operation mode in which the leaked cold air is dehumidified and reheated and blown out indoors in the cooling / refrigeration operation. In this operation mode, the cooling operation of FIG. 3 is simultaneously performed in the refrigeration, dehumidification, and reheat operation of FIG. 5, and there is no particular difference from each operation mode, so the description is omitted.
[0024]
FIG. 8 shows the heating operation mode, in which the solenoid valves V1, V3, V4 are open and the others are closed. In FIG. 8, the reheating condenser 17 is also used as a heating condenser of the air conditioner 2. That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor 9 is sent to the reheat (heating) condenser 17 via the electromagnetic valve V1, and the indoor air circulated and blown by the blower fan 18 (FIG. 1). Heat exchange is performed, and the indoor air is heated and condensed. This liquid refrigerant is sent to the receiver 20 via the electromagnetic valve V4, then decompressed by the expansion valve 25 and enters the common condenser 10, and is evaporated by heat exchange with outdoor air using the common condenser 10 as an evaporator. Then, it returns to the compressor 9 through the accumulator 23. According to the operation mode of FIG. 8, since the condenser for an air conditioning can be omitted, the piping configuration is simplified.
[0025]
FIG. 9 shows an operation mode when the heating load and the refrigeration load are balanced in the heating / refrigeration operation (heating load = refrigeration load). In FIG. 9, the solenoid valves V1, V4, V5 are open and the others are closed. The gas refrigerant discharged from the compressor 9 is sent to the reheat (also heating) condenser 17 via the electromagnetic valve V1 and liquefied, and sent to the receiver 20 via the electromagnetic valve V4. All of this liquid refrigerant is sent to the refrigeration evaporator 7 to evaporate, and returns to the compressor 9 via the electromagnetic valve V5 and the accumulator 23. In the operation mode of FIG. 9, high thermal efficiency can be obtained by using room air as a cold heat source for the refrigerated showcase 5 and using exhaust heat from the refrigerated showcase 5 as a heat source for the air conditioner 2.
[0026]
FIG. 10 shows an operation mode when the heating load exceeds the refrigeration load (heating load> refrigeration load) in the heating / refrigeration operation similar to FIG. In this case, the electromagnetic valve V3 is opened as compared with FIG. 9, and a part of the liquid refrigerant (surplus) stored in the receiver 20 is decompressed by the expansion valve 25, and then the common condenser 10 is used as an evaporator. It evaporates by heat exchange with the outdoor air and is collected by the compressor 9 via the electromagnetic valve V3 and the accumulator 23.
[0027]
FIG. 11 shows an operation mode when the heating load is lower than the refrigeration load in the same heating / refrigeration operation as in FIG. 9 (heating load <refrigeration load). In this case, the electromagnetic valve V2 is opened compared to FIG. 9, and the liquid refrigerant condensed in each is sent to the common condenser 10 and the reheating condenser 17 discharged from the compressor 9 at the receiver. 20 are combined and sent to the refrigeration evaporator 7. As described above, according to the operation modes of FIGS. 10 and 11, it is possible to flexibly cope with the imbalance between the heating load and the refrigeration load by the opening / closing control of the electromagnetic valves V2 and V3.
[0028]
FIG. 12 is a device layout diagram in a store showing a different embodiment of the present invention. The main difference from FIG. 1 of this embodiment is that the air-conditioning evaporator 3 is also used as a dehumidifying evaporator. That is, in FIG. 12, a reheat (also heating) condenser 17 and an air conditioning (and dehumidification) evaporator 3 are provided in the air conditioner 2 so as to overlap each other. Leaked cold air 15 is sucked up to the ceiling by the blower fan 18 and further sucked through the reheating condenser 17 and the air conditioning evaporator 3 by the ventilation fan 4 of the air conditioner 2 and blown out into the room. At that time, outside air is simultaneously introduced through the damper 19, and this outside air is mixed with the leaked cold air 15 and sent to the air conditioner 2.
[0029]
FIG. 13 is a refrigerant circuit diagram of the refrigeration / air conditioning integrated device of FIG. In FIG. 13, the difference from FIG. 2 is that the air conditioning evaporator 3 is also used as a dehumidifying evaporator, and the air conditioning evaporator 3 is also connected in series via the solenoid valve V6 to the rear stage of the refrigeration evaporator 7. It is a point. In the refrigeration evaporator 7, a pipe line through which liquid refrigerant is supplied from the common condenser 10 via the expansion valve 21 and a pipe line through which low-temperature gas after evaporation is supplied from the refrigeration evaporator 7 are separated. They are provided in parallel as pipes, and they merge at the outlet side of the air conditioning evaporator 3. The other circuit configuration of FIG. 13 is the same as that of FIG. According to the circuit configuration of FIG. 13, the refrigerant circuit is further simplified as compared with FIG.
[0030]
FIG. 14 shows the cooling / refrigeration operation mode by the refrigerant circuit of FIG. In FIG. 14, the liquid refrigerant from the common condenser 10 is evaporated by the air conditioning evaporator 3, and at the same time, the gas refrigerant evaporated by the refrigeration evaporator 7 is opened by opening the electromagnetic valve V <b> 6. To supply. The evaporation temperature (for example, −10 ° C.) of the refrigeration evaporator 7 is lower than the evaporation temperature (for example, + 5 ° C.) of the air conditioning evaporator 3. Therefore, by guiding the gas refrigerant on the outlet side of the refrigeration evaporator 7 to the air conditioning evaporator 3, it is possible to effectively utilize the refrigerated sensible heat for air conditioning (cooling) and to improve the overall thermal efficiency.
[0031]
FIG. 15 shows an operation mode in which the leaked cold air is dehumidified and reheated and blown into the room in the cooling / refrigeration operation of FIG. In FIG. 15, in addition to the cooling / refrigerating operation, a part of the high-temperature and high-pressure gas refrigerant discharged from the compressor 9 is sent to the reheating condenser 17 via the electromagnetic valve V1. On the other hand, as shown in FIG. 12, the leaked cold air 15 leaked from the refrigerated showcase 5 is sucked by the blower fan 18 and mixed with the outside air, and then the reheat condenser 17 and air conditioning (also dehumidifying) evaporation. It is blown into the room through the vessel 3. Therefore, the leaked cold air 15 that has passed through the reheating condenser 17 is heated, then dehumidified by the air conditioning evaporator 3 and blown into the room. The other operation modes are the same as those in the embodiment of FIG.
[0032]
【The invention's effect】
As described above, according to the present invention, the cold air leaked from the refrigerated showcase is heated with condensation exhaust heat, and further dehumidified with the refrigerated sensible heat of the refrigerated showcase and blown out into the room, so The air conditioning load can be reduced while eliminating discomfort, and the energy efficiency of the air conditioning / refrigeration integrated device can be increased.
[Brief description of the drawings]
FIG. 1 is a device arrangement diagram in a store of a refrigeration / air conditioning integrated device showing an embodiment of the present invention;
FIG. 2 is a refrigerant circuit diagram of the refrigeration / air conditioning integrated device of FIG. 1;
FIG. 3 is a refrigerant circuit diagram illustrating a cooling operation mode of the refrigeration / air conditioning integrated device of FIG. 1;
4 is a refrigerant circuit diagram illustrating a refrigeration operation mode of the refrigeration / air conditioning integrated device of FIG. 1. FIG.
FIG. 5 is a refrigerant circuit diagram illustrating a refrigeration / dehumidification / reheat operation mode of the refrigeration / air conditioning integrated device of FIG. 1;
6 is a refrigerant circuit diagram illustrating a cooling / refrigeration operation mode of the refrigeration / air conditioning integrated device of FIG. 1; FIG.
7 is a refrigerant circuit diagram illustrating a cooling / refrigeration / dehumidification / reheat operation mode of the refrigeration / air conditioning integrated device of FIG. 1; FIG.
FIG. 8 is a refrigerant circuit diagram illustrating a heating operation mode of the refrigeration / air conditioning integrated device of FIG. 1;
FIG. 9 is a refrigerant circuit diagram illustrating a heating / refrigeration operation mode when the heating load and the refrigeration load of the refrigeration / air conditioning integrated device of FIG. 1 are the same.
10 is a refrigerant circuit diagram illustrating a heating / refrigeration operation mode in a case where the heating load of the refrigeration / air conditioning integrated device of FIG. 1 exceeds the refrigeration load. FIG.
FIG. 11 is a refrigerant circuit diagram showing a heating / refrigeration operation mode when the heating load of the refrigeration / air conditioning integrated device of FIG. 1 is lower than the refrigeration load.
FIG. 12 is a device arrangement diagram in the store of the refrigeration / air conditioning integrated device showing a different embodiment of the present invention.
13 is a refrigerant circuit diagram of the refrigeration / air conditioning integrated device of FIG. 12. FIG.
14 is a refrigerant circuit diagram showing a cooling / refrigeration operation mode of the refrigeration / air conditioning integrated device of FIG. 12. FIG.
15 is a refrigerant circuit diagram illustrating a cooling / refrigeration / dehumidification / reheat operation mode of the refrigeration / air conditioning integrated device of FIG. 12. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Store 2 Air conditioner 3 Air conditioner evaporator 4 Blower fan 5 Refrigerated showcase 7 Refrigerator evaporator 8 Outdoor unit 9 Compressor 10 Common condenser 11 Blower fan 15 Leaked cold 16 Dehumidifier evaporator 17 Reheat condenser 18 Blower 19 Damper

Claims (8)

In the refrigeration / air conditioning integrated device in which a compressor is provided in common for an air conditioner that cools and heats the room and a refrigerated showcase installed in the room,
A reheat condenser is provided in parallel with the condenser common to the air conditioner and the refrigerated showcase, and the recooled condenser heats the leaked cold air leaking from the refrigerated showcase and blows it into the room. An integrated refrigeration / air conditioning system characterized by the above. The refrigeration / air-conditioning integrated apparatus according to claim 1, wherein a dehumidification evaporator is provided in series in a subsequent stage of the refrigeration evaporator of the showcase, and the leaked cold air is dehumidified by the dehumidification evaporator. . 3. The refrigeration / air conditioning integrated device according to claim 1, wherein outside air is mixed with the leaked cold air passing through the reheat condenser. The refrigeration / air conditioning integrated apparatus according to claim 1 or 2, wherein the refrigerant condensed by the reheating condenser is supplied to the refrigeration evaporator. The refrigerator / refrigerator according to claim 4, wherein a surplus of the refrigerant condensed by the reheat condenser is evaporated by using a condenser common to the air conditioner and the showcase as an evaporator. Air conditioning integrated device. The refrigeration / air conditioning integrated apparatus according to claim 1 or 2, wherein the reheat condenser is also used as a heating condenser of the air conditioner. The refrigeration / air conditioning integrated device according to claim 2, wherein the dehumidifying evaporator is also used as a cooling evaporator of the air conditioner. The refrigeration / air conditioning integrated device according to claim 1 or 2, wherein the refrigerant on the inlet side of the evaporator for refrigeration or the evaporator for air conditioning is supercooled by heat exchange with the refrigerant on the outlet side. .

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