CO₂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

第2報, 貯湯槽のモデル化とシステムの分析

抄録

Heat pumps using CO₂ as a natural refrigerant have been developed and are expected to contribute to energy saving in hot water supply. In residential applications, CO₂ heat pumps are used in combination with hot water storage tanks. The objective of this series of papers is to analyze the overall performance of a hot water supply system composed of a CO₂ heat pump and a hot water storage tank by numerical simulation. In the 2nd report, a simulation model of a hot water storage tank is created and the performance of a hot water supply system is analyzed. The performance calculated is compared with that measured, and the simulation model is validated. The trade-off relationship between the system efficiency and the volume of hot water unused through the operational condition on the inlet water temperature is clarified quantitatively.