Thesis

하천수 열원을 이용한 2단압축 열펌프 시스템의 시뮬레이션
Year of publication 2004
Title of paper 하천수 열원을 이용한 2단압축 열펌프 시스템의 시뮬레이션
Author 김보현
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Abstract A system simulation program was developed for a 2-stage compression heat pump system using river water. This heat pump system simulation program was developed to predict actual system performance and optimal operating conditions. The river water as a heat source can provide more beneficial impacts on the performance of the heat pump system compared to the use of atmospheric air because the temperature variation of the 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 in winter and as a heat sink in summer was numerically investigated. Especially, the simulation model for the 2-stage compression heat pump system was developed with each component model. The heat pump system was composed of a compressor, a heat exchanger, an expansion device, and a flash tank. The electronic expansion valve(EEV) was utilized to optimize the system performance. In this study, the decrease in the river water temperature and the increase in the EEV step improved the cooling performance in summer. However, in the heating mode, the high-stage and the low-stage refrigerant mass flow rate were dependent on each other in the respect of energy balance. Therefore, the maximum heating COP and the heating capacity were determined by not only river water temperature but also operating conditions. To increase the heating performance, the optimal design of components, the optimal selection of the EEV step and the operating conditions are required.
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석사학위논문