지하공기열 이용을 위한 제습 및 난방 히트펌프시스템에 관한연구

Abstract

An experimental study is conducted to develope a horizontal-vertical type underground air picking system. The experiment, which is processed with change of temperature and humidity, conducted to improve effectiveness and to develope a system that will use ground air source and can be applied to horticulture facilities in Jeju Island. Temperature and humidity was adjusted several times during the experiment which was modify underground air conditions. For the heat pump cycle, multiple evaporators and condensers were used with one compressor in the developed system. While passing several condensers, the temperature of dehumidified underground air which just passed through multiple evaporators rises. The experiment for the developed heat pump system is conducted in two ways, the series evaporating cycle and the parallel evaporating cycle. The temperature of dehumidified air rose when it passes through the condensers in the experiment of parallel, series evaporating heat pump system. As results, the heating performance showed about a same level of capacity on average heating system compare to the general unit heaters. However, on the test of series heat pump cycle, the dehumidification did not occur at the third evaporator. In the parallel and series heat pump system, the temperature of air that just completed dehumidification in a evaporator goes up when it passes a condenser. The parallel evaporating heat pump system showed 2.44 in COP, and the series system showed 2.01 which is 18% decreased numerical value compare to parallel one. Also the capability of dehumidification of parallel heat pump cycle was 0.93 kg/kWh, but series cycle had 0.69 kg/kWh. The result indicates that the parallel heat pump cycle system has much efficiency than the series pump system.