• 대한기계학회논문집
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• 제17권1호
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• pp.153-161
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• 1993

본 연구에서는 각 운전모드별 열특성을 전체적으로 고려하여 양질의 MHD발전 용 작동플라즈마를 얻기 위하여 필요한 효과적인 방책에 관하여 집중적으로 고찰하고 자 한다.

• 한국농공학회논문집
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• 제50권3호
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• pp.43-48
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• 2008

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 follows: 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, and 11,682MJ, respectively. The yearly energy expenses of the PSHS and the alternative heating system (conventional coal heating system, CCHS), which uses coal, were found to be USD 1.60/year and USD 60.90/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 LCC analysis in the two systems, is 40 years, the total expenses for the life cycle of the PSHS and the CCHS will be USD 1,431.50 and USD 2,740.00, respectively. The period for the investment payback of the PSHS is six years.

• 대한설비공학회지:설비저널
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• 제8권2호
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• pp.81-88
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• 1979

The performance of air type solar heating system has been investigated for a system which has been operating continuously for two years. Design factors of a collector, such as the effective transmittance-absorptance and heat transfer factor were also determined experimentally. The flat plate collector is fabricated from steel sheet metal with two sealed glass covers. Solar heat is stored in a pebble bed of primarily granitic rock approximately 20-40 mm in diameter. The system is controled by automatically driven motors and dampers. The ratio of useful collected solar heat divided by the total solar radiation on the collector dropped was the range of 35 to 42 percent in monthly average. As it result, the air system was found fairly competitive with the water system, however, the heat supply from storage was limited because of using the pebble as the heat storage media.