다양한 변수에 따른 하이브리드 쿨링 시스템의 성능 특성

Abstract

In South Korea, the average temperature in the summer season is higher than 30℃ and it has large effect on various industries. Sweltering heat not only reduces the work efficiency of labors, but also causes the thermal illnesses such as heat stroke. Furthermore, most of domestic animals, like pigs and chickens, may be perished by diseases if they are exposed by the high temperature consistently. In order to save them from the heat wave, numerous efforts are carried out by installing a shading net, adjusting time of feeding, spraying mist and setting up a circulation fan. However, the methods haven’t shown significant improvements even though they ease the damage. The present study proposes a hybrid cooling system combining evaporative cooler and air-conditioner in order to resolve the conventional problems in the livestock industry by the high temperature. The hybrid cooling system replenish a lacking cooling capacity of the evaporative cooler by employing the conventional air-conditioner. The system inhales air by using a fan. After the induced air is cooled by the evaporation of water in the cooling pad, it is cooled again by an evaporator in the air-conditioner. Since the proposed system is very new concept in the relevant field, there are almost no literatures about it globally. Therefore, the present study focuses on presenting a basic design information of the hybrid cooling system for the future researches. The experimental results are summarized as follows; The outlet temperature of air lowers and system coefficient of performance (COP) increases in case that the cooling pad is installed in front of the evaporator. System power input and COP decreases and rises, respectively, when the cooling pad is located in front of a condenser. For an air velocity, the system COP shows minor changes even though the outlet temperature of air, system power input and cooling capacity grow with respect to it. The system cooling capacity and power input increase in case of surrounding temperature growth. In addition, the outlet temperature of air sharply rises and the system COP decreases. In case relative humidity grows, the system cooling capacity and COP declines even though the outlet temperature of air rises altogether. The system power input is almost steady with respect to the relative humidity, Decreases cooling capacity and COP as well as increased power input and outlet temperature of the air are verified when temperature of water flowing the cooling pad grows.