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차동안(DongAn Cha),배경진(KyungJin Bae),권오경(OhKyung Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Adsorption chillers have been receiving considerable attentions as they are energy saving and environmentally friendly systems. In this paper, water vapor adsorption experiments of adsorbent coating plate were performed in the batch type adsorption apparatus. The adsorbent and the refrigerant used for the experiment were FAPO and water. Four operating conditions of adsorbent coating plate : binder ratio, coating thickness, evaporator temperature and adsorption chamber temperature are experimented. The experimental results show that the adsorbent coating plate gave the best binder ratio of 10%, coating thickness of 0.2㎜, and adsorption time of 7min. Also, it is found that evaporator temperature of 14℃ and adsorption chamber temperature of 25℃ showed better performance in the adsorption rate than that of the other evaporator temperature(6℃, 10℃) and adsorption chamber temperature(30℃, 35℃).
하이브리드 방식을 적용한 흡수식 냉방시스템의 실험적 연구
권오경(Ohkyung Kwon),차동안(Dongan Cha),김효상(Hyosang Kim),우성민(Sungmin Woo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, the performance evaluation for a solar/gas hybrid absorption system using LiBr-H₂O is experimentally studied. In order to use solar energy more effectively, a new type of solar/gas driving hybrid absorption system is designed. This system operates in solar energy without gas consumption when solar radiation is high and in gas energy when solar radiation is low. So the objective of this paper is to investigate the cooling characteristics of a hybrid absorption system using solar and gas energy. In this system, three different modes are conducted: single, double and hybrid operation mode. A prototype is designed and made in the present study. The results show that the COP in the hybrid mode can reach 1.53, increasing of 28.6% as compared with the COP 1.19 in the double effect mode.
R245fa 냉매를 이용한 배열회수 히트펌프 시스템 성능에 관한 실험적 연구
김현택(Hyuntaek Kim),김용찬(Yongchan Kim),차동안(Dongan Cha),권오경(Ohkyung Kwon) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.10
The objective of this study is to investigate the performance of a heat recovery heat pump dryer using a R245fa refrigerant experimentally. In this study, the main components of the heat pump dryer were an evaporator, a compressor, a condenser, and an expansion valve. As a result, when the amount of refrigerant varied from 15 kg to 16 kg, the hot air outlet temperature in the condenser and the heat transfer rate were almost kept constant. Therefore, the amount of refrigerant at 16 kg was considered to be a suitable amount in the heat pump. As the air inlet velocity varied from 0.5 m/s to 1.5 m/s, the highest temperature in the condenser could be obtained when the air inlet velocity was 0.5 m/s. The heat transfer rate, system (COP), and hot air outlet temperature were 5.6 kW, 3.4, and 102.5℃, respectively, when the bypass ratio and water temperature were 0% and 60℃