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이철구(Chulgoo Lee),김종대(Jongdae Kim),임태순(Taesoon Im),방승기(Seungki Pang),함흥돈(Heungdon Ham) 한국지열·수열에너지학회 2011 한국지열에너지학회논문집 Vol.7 No.1
Feasibility study on energy saving system by utilizing exhausted heat from subway, which is one of the unused energy, was carried out. General heat source system using absorption chiller-heater was used for comparing to the energy saving system, and payback period method using initial cost and running cost of two systems, was used to perform economic estimation. Payback period was about ten years, and this period might be shortened if nation's economic support enact.
이철구(Chulgoo Lee),김종대(Jongdae Kim),임태순(Taesoon Im),최명식(Myungsik Choi),방승기(Seungki Pang),함흥돈(Heungdon Ham) 한국지열·수열에너지학회 2013 한국지열에너지학회논문집 Vol.9 No.2
It has become very important for unused energy to be used for building air conditioning. Economic evaluation on energy system by using river water as a heat source, which is one of the unused energy, was carried out. The floor area of the building and the distance between heat source equipment and river was assumed 50,000 ㎡ and 200 m. General heat source system using absorption chiller-heater was used for comparing to the energy saving system, and payback period method using initial cost and running cost of two system, was used to perform economic evaluation. According to development of high capacity of water source heat pump which is appropriate for using river water, initial cost for the system has been reduced. Payback period was about 3.2 years, and this period might be shortened if nation’s economic support enact.