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농산물 저온저장을 위한 H2O-NaCl 혼합물의 축열 특성
송현갑(H.K.Song),유영선(Y.s.Ryou),박종길(J.G.Ro),노정근(J.K.Park) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.3
본 연구에서는 잠열온도 조절에 관한 이론과 상변화 잠열재의 결정핵형성이론 그리고 PCM 결정화 모델을 정립하고, 농산물 저온 저장에 이용할 수 있는 냉축열 잠열재로 H₂O를 선정하여 NaCl을 온도 조절제로 잠열온도를 조절하였으며, 상변화 사이클에 의한 열특성 변화 추이와 물성의 안정성을 실험적으로 분석하였다. The theory on phase change tel11JHClture control and nucleation of PCM was suggested in this research. The crystallization model of PCM was established. And H2O- NaCl mixtures were selected as cold storage materia1s for agricultural products and therrm-physica1 properies of the PCM were ana1yzed with eXJHirrenta1 processes including freeze-thaw cycles.<br/>
백은기,노정근,송현갑 한국농업기계학회 2003 바이오시스템공학 Vol.28 No.3
To find out heating load and to determine the power of heat pump compressor for the Ondol room heating the COP of heat pump, the variation of Ondol room air temperature, the variation of ambient temperature and power consumption of heat pump are analyzed. The results from this study were summarized as follows: 1.The COP of the heat pump in close loop decreased as the ambient air temperature. The COP was 2.26 when the temperature difference of condenser was 20±3˚C. 2.The Ondol surface temperature was 25±3˚C when the hot water of 40˚C was supplied from hot water storage tank to the Ondol and the temperature difference between the Ondol surface and the room air temperature was 7~8˚C. 3.The ratio of thermal conduction heating load to total heating load in Ondol heating space was found to be 83% and ratio of ventilation heating load was 17%. Therefore, the thermal conduction heating load was confirmed to be a major heating load in Ondol heating space. 4.In case of the ambient temperature of 3.2˚C, the efficiency of heat exchange of Ondol heating system was 85%. 5. The heating load per Ondol heating surface area and volume of Ondol room space were theoretically analyzed. Incase of the room temperature of 20˚C and the ambient temperature of -3.2~3.8˚C, the heating load per Ondol surface area was 115.8~167.6kJ/h·m^3 and per Ondol room space volume was 50.2~72.76kJ/h·m^3 . 6.the compressor power of heat pump for the Ondol room heating could be determined with the heating load analyzed in this study In case of the Ondol room air temperature of 17~20˚C and the ambient temperature of -5~3.8˚C, the compressor power of heat pump per Ondol surface area was analyzed to be 2.3×10^_2~3.3×10^_2 ps/m^2, and per volume of Ondol room space 1.0×10^_2~1.4×10_2 ps/m^3.