논문 상세보기
pp.200-206
In order to effectively utilize thermal energy, we analyzed the performance of the high efficiency latent heat storage system which can be used for greenhouse heating by using the developed phase change material. The system consists of hot water boiler, heat storage material, heat storage box, heat storage tank, circulation pump, control panel, and storage material. As a result, the latent heat and latent heat temperature of sodium acetate hydrate as latent heat storage material are 231.6 ~ 264.8kJ/kg, 54.95 ~ 55.48℃. As the number of cooling and heating increased, the latent heat temperature showed a slight change, but the latent heat decreased 33.1kJ/kg as the number of repetition increased. In the case of sodium acetate hydrate, large supercooling phenomenon was observed, and it was found that mixing of additives such as nucleating agent, thickener and supercooling agent can control the supercooling more effectively. The consumption of kerosene decreased until the temperature of the heat storage tank was raised to the set temperature by the closed circuit for 4 hours in the initial stage of the boiler operation. The heat exchange rate according to the change of the flow rate was maintained at the set temperature inside the heat storage tank after 4 hours of operation, Consumption was high. As the flow rate increased, the inlet and outlet temperature difference decreased, the heat exchange rate increased, and the heat exchange efficiency was in the range of 57.4 ~ 60.5%.
1. 서 론
2. 재료 및 방법
2.1 상변화온도 측정시스템 구성
2.2 상변화물질을 이용한 보일러 부착용 축열 시스템 구조
2.3 축열조 내부 열교환기의 열교환 열량 및 효율 측정
2.4 온실 난방부하를 통한 온수보일러 및 축열조 용량 산정
3. 결과 및 고찰
3.1 초산나트륨수화물 잠열축열물질의 냉각/가열 횟수에 따른 잠열량 및 잠열온도 변화
3.2 첨가제 혼합에 따른 잠열축열물질의 과냉현상 변화
3.3 온수보일러 가동에 따른 유량 및 연료소비량
3.4 온수보일러 가동에 축열조 입·출구온도 및 열 교 환량
4. 결 론
후 기
References
