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백남춘,양윤섭,윤응상,이진국,주문창,Baek, N.C.,Yang, Y.S.,yoon, E.S.,Lee, J.K.,Joo, M.C. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.1
In this experimental study, the air cooling radial shape heat exchanger which influences on the COP and the cooling capacity by heat and mass transfer rate in the adsorbent bed was designed and applied to test its performance for adsorption heat pump(AHP). Zeolite-water was used for the adsorbent-adsorbat pair. As a result, the cooling COP and a cycle period of this adsorption heat pump are 0.28 and 2 hours, respectively, on the condition of none heat recovery from the adsorption reactor(absorber). The other results and recommendations are mainly related to improving the heat and mass transfer inside the absorber to reduce a cycle period.
곽희열(Kwak Hee-Youl),윤응상(Yoon Eung-Sang),주문창(Joo Moon-Chan),주홍진(Joo Hong-Jin) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study was analyzed the long term performance of the demonstration system for solar energy desalination in Jeju. we used a solar thermal system as heat source of the single-stage fresh water generator with plate-type heat exchangers and a photovoltaic power system as electric source for hydraulic pumps. The demonstration system was designed and installed at Jeju-island in 2006. The system was comprised of the desalination unit with daily fresh water capacity designed as 2㎥, a 120㎡ evacuated tubular solar collector to supply the heat, a 6㎥ heat storage tank, and a 5kW photovoltaic power generation to supply the electricity of hydraulic pumps for the heat medium fluids. Through the operation during about 3 years, In a clear day more than 400W/㎡, the daily fresh water showed to produce more than about 500liter, and from January, 2007 to March, 2009 for 3 years, solar irradiance daily averaged was measured 370W/㎡, the daily fresh water yield showed that can be produced about 330liter.
김정배(Kim Jeongbae),윤응상(Yoon Eung-Sang),주문창(Joo Moon-Chang),곽희열(Kwak Hee-Youl) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
In this research, to develop the application system for practical use of fresh water generation system with low pressure evaporation method is the main object using the evacuated solar collector with operating range of about 50-85℃ as thermal system and solar photovoltaic system as electric supply system. To achieve that object, this study will set up the demo-plant, then estimate and analyze the usefulness, the safety, the reliability and the economical effectiveness. The fresh water generation rate would be about 2 Ton per day. And the estimated solar collector area for heating medium was about 120 square meters and PV system was estimated 5kW as the total electric requirement.
Study on COP Variations with the duration of Ground Source Heat Pump Systems Operation
이용규(Lee, Yonggyu),백남춘(Baek, Namchoon),윤응상(Yoon, Eungsang) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
In this study, the COP variation with the duration of Ground Source Heat Pump (GSHP) systems operation was analyzed by experiment. This experimental facility was installed in residential house as a back-up device of solar thermal heating system. The capacity of heat pump is 2.5 kW with a vertical bore hole of 150m depth. The COP of GSHP is varied, depending on the ground temperature which is used as a heat source. The ground heat source temperature influencing heating COP is the soil or rock temperature which adjoin with geo-source heat exchanger. This temperature is decreased rapidly according to the operation duration of heat pump. As a result, COP of GSHP is decreased to 3 in one hour of continuous operation time.