JP2005114217A - Air conditioning/refrigerating facility for store - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an in-store cooling load while disposing drain water from an air conditioning/refrigerating facility for a store. <P>SOLUTION: Condensed water from an evaporator 4 of an air conditioner 2 in a store building 1, and defrosting water from a cooler 7 of a showcase 5 are collected in a drain tank 16, and the drain water is sprinkled on a roof 12 of the store building 1 by a pump 17 via a sprinkler tube 18. By sprinkling the low temperature water and cooling the roof 12 by its sensible heat and latent heat, temperature of an underpart 19 of the roof is lowered, a cooling load of the air conditioner 2 is reduced, and at the same time, the drain water can be automatically disposed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to an air conditioning / refrigeration facility installed in a store such as a convenience store, and more particularly to an apparatus for reducing a cooling load.

  Convenience stores and other stores have air conditioners and refrigerated / frozen showcases (hereinafter simply referred to as “showcases”). Air conditioners cool stores in the summer, and showcases cool products in the warehouse. doing. In general, refrigeration cycles are used for air conditioners and showcases. Air conditioners cool indoors by circulating indoor air through an evaporator that evaporates liquid refrigerant, and showcases pass through a cooler that evaporates liquid refrigerant. The product in the warehouse is cooled by circulating air.

  In the cooling by the above-described air conditioner, water vapor contained when the indoor air flows through the low-temperature evaporator condenses and generates drain water flowing down from the evaporator surface. Further, in the showcase, water vapor contained in the internal air flowing through the cooler is frozen by contact with a low-temperature cooler, and frost is generated on the cooler surface. The frost is melted by a defrosting operation performed at an appropriate timing, and drain water (defrost water) is generated at that time.

Such drain water is discharged outdoors, but in small-scale stores that do not have drainage facilities on the floor of the sales floor, drain water is temporarily stored in a drain tank attached to an air conditioner or a showcase. Carry the tank to the drainage facility and throw it away. This drain water disposal work is a considerable burden for store employees. The problem of such drain water treatment in the showcase is described in Patent Document 1.
Japanese Patent Laid-Open No. 10-281627

  On the other hand, in a small-scale store such as a convenience store, a building having a simple structure is often used to reduce the construction cost. In this case, the amount of heat entering from the outside in the summer increases. The amount of intrusion heat is particularly large from the roof part that receives direct sunlight, and the temperature of the back of the ceiling reaches as high as 50 to 70 ° C. in a store with a simple structure, and the cooling load caused thereby is extremely large.

  The present invention has been made under the above-described circumstances, and an object of the present invention is to reduce the cooling load in the store while processing drain water generated from the store air conditioning / refrigeration equipment.

  In order to solve the above problems, the present invention includes an air conditioner and a showcase in a store building, and the air conditioner cools the room by circulating indoor air through an evaporator that evaporates liquid refrigerant, and the show In the air conditioning and refrigeration equipment for stores that cools the goods in the warehouse by circulating the air in the warehouse through a cooler that evaporates the liquid refrigerant, the case is either condensed water generated from the evaporator of the air conditioner or the cooler of the showcase. A sprinkler for collecting the generated defrost water and sprinkling the roof of the store building is provided.

  According to the investigations by the inventors at a convenience store, about 1 to 2 liters of drain water (condensed water) at about 15 ° C. per one air conditioner whose evaporation temperature of refrigerant in the evaporator is about 5 ° C. In one showcase where the refrigerant evaporating temperature in the cooler is about −10 ° C., 2 to 3 liters of drain water (defrost water) at about 5 ° C. is generated per hour. Conventionally, this low-temperature drain water is wastefully discarded, but in this invention, this drain water is sprayed on the roof of the store and the sensible heat (cold heat) and latent heat (evaporation heat) of the drain water is used. It is intended to cool. Thereby, the cooling load can be reduced by lowering the temperature of the ceiling, and at the same time, the drain water can be treated.

  According to the present invention, drainage water generated from an air conditioner or a showcase is collected and sprinkled on the roof of the store building, so that the cooling load is conventionally utilized by using the sensible heat or latent heat of the drained water that has been wasted. In addition, the drain water can be treated at the same time, and it is possible to save the trouble of carrying and draining the drain tank even in a small-scale store.

  FIG. 1 is a system configuration diagram showing an embodiment of the present invention. In FIG. 1, an embedded air conditioner (indoor unit) 2 is installed in the ceiling in a building 1 of a store such as a convenience store, and the air conditioner 2 is sucked by a blower 3 as indicated by an arrow. Air is circulated through the evaporator 4 into the room for cooling. In addition, a showcase 5 is installed along the wall, and as shown by an arrow, the showcase 5 circulates the internal air through the cooler 7 by the blower 6 to cool the unshown internal product. Liquid refrigerant is supplied to the air conditioner 2 and the showcase 5 from a common outdoor unit 8, and the outdoor unit 8 condenses the high-temperature and high-pressure gas refrigerant discharged from the compressor 9 and the compressor 9 that compresses the refrigerant. The condenser 10 includes a blower 11 that cools the condenser 10 with outside air.

  As already described, condensed water is generated from the evaporator 4 of the air conditioner 2, and defrosted water is generated from the cooler 7 of the showcase 5. Therefore, in the illustrated embodiment, a watering device 13 for spraying these drain water (condensed water and defrosted water) to the roof 12 of the store building 1 is provided. That is, the drain water of the evaporator 4 and the cooler 7 is collected in the drain tank 16 via the drain pipes 14 and 15. When the water level in the drain tank 16 rises to a certain level, the pump 17 is activated by a signal from a level sensor (not shown), and the drain water is sprinkled on the roof 12 of the store building 1 through the water spray pipe 18. When the water level of the drain tank 16 falls to a certain level, the pump 17 stops, and thereafter, when the water level rises again to the certain level, the automatic operation in which the pump 17 is restarted is repeated.

  In the illustrated embodiment, for example, about 15 ° C. drain water is discharged from the air conditioner 2, and for example, about 5 ° C. drain water is discharged from the showcase 5. These drain waters are mixed by the drain tank 16, and are sprinkled on the roof 12 as 12-13 degreeC drain water, for example. This drain water evaporates in contact with the heated roof 12 in summer, and cools the roof 12 by the sensible heat and latent heat. As a result, the temperature of the ceiling back 19 decreases, the amount of heat transferred from the ceiling back 19 to the room decreases, and the cooling load of the air conditioner 2 decreases. That is, according to the illustrated embodiment, the drain water that has been wasted in the past is used to save energy in the cooling, and at the same time, the drain water is automatically discharged by the pump 17 to eliminate the manual drain water treatment. be able to.

1 is a system configuration diagram showing an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Store building 2 Air conditioner 4 Evaporator 5 Showcase 7 Cooler 8 Outdoor unit 12 Roof 13 Sprinkler 14 Drain pipe 15 Drain pipe 16 Drain tank 17 Pump 18 Sprinkler pipe

Claims (1)

The store building is equipped with an air conditioner and a showcase, the air conditioner cools the room by circulating indoor air through an evaporator that evaporates liquid refrigerant, and the showcase passes through a cooler that evaporates liquid refrigerant. In store air-conditioning and refrigeration equipment that cools products in the warehouse by circulating air,
An air conditioning / refrigeration facility for a store comprising a watering device that collects condensed water generated from an evaporator of the air conditioner or defrosted water generated from a cooler of the showcase and sprays water on the roof of the store building .

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