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프로세스 시뮬레이션에 의한 제 2종 흡수식 열펌프 성능에 관한 연구
조승연,김영인,Cho Seung Yon,Kim Young in 대한설비공학회 1987 설비저널 Vol.16 No.3
The purpose of this study is to develop a computer model for simulating the water-lit hium bromide absorption heat transformer (AHT) Including all major components and to find the flexibility in operation. The effect of source hot water temperature, cooling water temperature, useful hot water flow rate, cooling water flow rate and evaporator circulation flow rate were investigated. The coefficient of performance (COP), temperature boost $({\Delta}T\;=\;T_A\;-\;Ti)$ and concentration variations can be predicted. The performance study indicates that the performance of AHT increases for the waste hot water temperature increasing and with a decrease of the cooling water temperature. The effect on performances of useful hot water flow rape is significant except on temperature boost. Also the effects on performance of cooling water flow rate and evaporator circulation flow rate are small. It is shown that the computer program is valuable to predict the performance of absorp-tion heat transformer units at various working corditions.
조승연(Seung Yon Cho),오옥두(Ok Doo Awh),박신영(Shin Young Park),정양근(Yang Kun Chung),김희근(Hee Kun Kim) 한국환경보건학회 2000 한국환경보건학회지 Vol.26 No.1
Radon progenies existing in indoor air were measured with α spectrometry. The concentrations of 218po, 214Pb, 214Bi and their unattached fractions inside the experimental chamber and Young Kwang Atomic Power Plant were measured with a relative standard deviation of below 50% after the analysis of α spectrum. The results Were compared with the other instrumental methods such as total α count and WL meter. The concentration of radon and the indoor condition were changed intentionally inside the chamber to study the behaviour of radon and radon daughters. Airborne particulates such as tobacco smoke increase equilibrium factor(EF, a major factor of the risk caused by radon) from 1.7 to 2.4 depending on indoor tobacco smoke concentrations. Unattached ratio which is also a important factor for the risk assessment of radon is inversely related to the concentration of indoor tobacco smoke.