모세관 열교환기를 이용한 냉각장치에 관한 연구

Abstract

An experimental study was conducted to verify performance of an air conditioning system with additional evaporator in the system that is fabricated with capillary tubes. Due to the multi-function of the capillary tube in the system as expansion device and heat exchanger makes reduction of investment price and increment of effectiveness of the heat exchanger. In this study, capillary tube number, inner diameter and length of the capillary tube are selected as experimental parameter. The experiments are peformed with variation of operation condition of the air conditioning system. Mass flow rate of refrigerant, pressure and temperature at various point in the system and power consumption of the compressor is measured with coriolis type mass flow meter, pressure transducer, t-type thermocouple and power meter, respectively. As results, the Coeffciency of performance calculation result was that only 50 percent of each experimental condition was more than 1 Coeffciency of performance. and Most results of 6 capillary tube connected in parallel condition were more than 1 Coeffciency of performance. In case of 10 capillary tube, the Coeffciency of performance Significantly decreased unless the temperature of the cooling water was low. It means that the more diameter and condensing temperature of the capillary tube is high, the more compressor operation rate and energy consumption and the less efficiency. As a result, because capillary tube absorbs heat from environment, when temperature of the cooling water is low, capillary tube can drop the condenser temperature much more so that electronic power consumption can be minimized. If more research can be done on heat exchange through capillary tube, we can expect an more efficient energy-saving solution in the very future.