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가스보일러 코일형 열교환기의 열전달 특성에 관한 실험적 연구
홍성혁,김영기,김일겸,김동춘,이창언,임장순,Hong, S.H.,Kim, Y.K.,Kim, I.G.,Kim, D.C.,Lee, C.E.,Yim, C.S. 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.18 No.4
The performance of gas-fired boilers were experimentally investigated. The heat exchanger used for the experiments consisted of circular tube with longitudinal fins for the gas side and a spiral coil for the water side. The burner was located at the top of the heat exchanger, and the burned gas flowed down to the exit. The experiments carried out for different water flow rates, the heat capacities of the boiler and the number of baffle. The thermal efficiency of the upward flow was higher than that of the downward flow of the water in the heat exchanger. As the boiler capacity increased, the thermal efficiency decreased. As the number of the baffles increase, the thermal efficiency increased and the increasing rate of the efficiency decreased. The gas-side overall heat transfer coefficient was independent of the flow rate of the water. The effect of the number of the baffles on the heat transfer coefficient was greater than that of the boiler capacity.