448 CO_2ヒートポンプ給湯システムの数値シミュレーションによる性能分析 : システム性能に対する環境温度の影響(冷媒物性およびヒートポンプ,環境保全型エネルギー技術)

概要

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In the residential application, a CO_2 heat pump is used in combination with a hot water storage tank, and the performance of this system is affected significantly not only by instantaneous air and feed water temperatures but also by hourly changes of hot water consumption and temperature distribution in the hot water storage tank. In this paper, the performance of the system is analyzed by numerical simulation. A simulation model is created based on thermodynamic equations, and the values of model parameters are estimated based on measured data on existing devices. In a case study, the heat pump COP, storage tank and system efficiencies, volume of hot water unused, etc. are selected as criteria for system performance, and it is clarified how they are affected by seasonal changes of air and feed water temperatures.
社団法人日本機械学会の論文
2005-07-06