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박차식,안태길,박경우,김도형,차귀수,서정식,Park, C.S.,Ahn, T.K.,Park, K.W.,Kim, D.H.,Cha, G.S.,Seo, J.S. 한국초전도저온학회 2009 한국초전도저온공학회논문지 Vol.11 No.3
The thermal characteristics of quench propagation is a crucial problem for the stability of the superconductor. The objective of this study is to simulate the quench propagation with the variation of disturbance energy in Bi-2223/Ag HTS pancake coil. In this analysis, the temperature-time trace of a point away from heater was calculated under conditions of different quench energy. The critical disturbance energy between quench propagation and quench recovering was calculated, In addition, the minimum quench energy with different transport currents was obtained through the present simulation. These results are significant to the application of HTS.
R22를 적용한 전자팽창밸브의냉매유량 특성 및 유량예측 모델링
박차식,이선일,김용찬,이영수 대한설비공학회 2006 설비공학 논문집 Vol.18 No.11
The objective of this study are to analyze the flow characteristics of R22 flowing through EEVs and to develop an empirical correlation to predict the refrigerant flow rate. The mass flow rates of EEVs with different geometries were measured at various condensing temperatures, subcoolings, and EEV openings. Based on the experimental data, an empirical correlation for mass flow predictions in EEVs was developed by modifying the orifice equation. The correlation showed good agreement with the measured data for R22 with average and standard deviations of 1.4% and 6.1%, respectively. Approximately 90% of the measured data were within ±10% of the predictions.
하천수열원을 이용한 2단압축 열펌프의 난방성능 시뮬레이션
박차식,김보현,김용찬,이영수,방기영 대한설비공학회 2005 설비공학 논문집 Vol.17 No.11
The use of river water as a heat source of a heat pump has the advantage in the performance compared to the use of atmospheric air because the temperature variation of river water over the year is relatively small. In this study, the performance of the heat pump system using river water as a heat source was numerically investigated. A simulation model for the 2-stage compression heat pump system was developed with each component model composed of compressors, heat exchangers, a flash tank and electronic expansion devices. The performance of the heat pump system using river water was improved by 50% compared to that using atmospheric air in winter conditions.
열병합시스템 경제성 평가 프로그램의 개발 및 적용에 관한 연구
박차식,김용찬,Park, Chasik,Kim, Yongchan 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11
The object of this study was to develop an economic assessment program for the optimal design of the cogeneration systems composed of combining engine, generator, waste heat recovery exchanger, absorption chiller, and boiler, etc. The energy demand categorized by electric power, heating, cooling and water supply was determined by statistical data of the existing cogeneration systems. An economic assessment was performed by comparing the total cost of cogeneration system with that of non-cogeneration system. The total cost was evaluated by adding initial investment to operational cost considering efficiency of equipment, cost of equipment, fuel and electricity. To confirm the validity of the developed program, a hotel building with an area of $127,960m^2$ was selected, and the simulated results were compared with the measured data. The difference between the simulated and the measured values for the selected hotel building was approximately 12% for annual electric consumption.