Evaluation on efficiency of CO{sub}2 heat pump cycle for hot water supply - evaluation on theoretical efficiency and characteristics

摘要

In Japan, it is very effective for saving energy to develop highly efficient heat pumps for hot water supply. On the other hand, heat pumps with "natural working fluids" are being developed eagerly for environmental protection. After surveying the status of R&D relating to heat pumps with natural working fluids, CRIEPI focused on a CO{sub}2 heat pump and started a basic study on it We calculated COP of CO{sub}2 heat pump cycle for hot water supply and studied the characteristics of the cycle. We verified that CO{sub}2 cycle had unique characteristics and achieved higher COP than those of conventional working fluids.