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Moonki Jang,리신호,Piao Zailin,Zhang Yulong 한국농공학회 2008 한국농공학회논문집 Vol.50 No.3
The economics of a passive solar heating system(PSHS) with the pebble bed heat storage was evaluated, and the applications of the PSHS were analyzed, in this study. The results are as folows: The heating load, solar heat gain, and stored heat/year of the PSHS in the solar house model were found to be 10,778MJ, 3,438MJ, (conventional coal heating system, CCHS), which uses coal, were found to be USD1.60/year and USD60.90/year, respectively, and the yearly expenses of the PSHS were found to be 38 times less than those of the alternative heating system(CCHS). If it will be supposed that the life cycle of the passive solar heating system, according to the results of the LC analysis in the two systems, is 40 years, the total expenses for the life cycle of the PSHS and the CCHS will be USD1,431.50 and USD2,740.00, respectively. The period for the investment payback of the PSHS is six years.
( Ren Wentao ),( Liu Qingyu ),( Moonki Jang ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
Energy/Animal/food/fertilizer/Environment ecosystem (four-in one ecosystem) in rural area in the North of China means an integration of vegetable production, animal husbandry, fertilizer and biogas production inside greenhouse. The four-in one ecosystem has taken the place of a traditional farming industry, and has developed and has applied during nearly twenty years. The four-in one ecosystem for rural ecological environment and agricultural comprehensive productivity have been improved and upgraded.But with the development of rural economy, improving of people's living standards, a higher demand to the ecosystem is needed. This paper will analyze problems in the process of applying the ecosystem and optimizing the structure and functions in order to provide technical support to further promote the building of rural ecosystem.