抄録
Development and Installation of energy efficient hot water supply system using CO2 heat pump is increasing. For the purpose, it is very important to grasp the system performance and hot water usage in actual condition. Field survey on the hot water consumption and the performance of CO2 heat pump water heater was carried out in 13 residential houses of 7areas Japan. The survey consists of 2 parts, on-site measurement and questionnaires. In this paper, outline of the survey, daily and hourly fluctuation of hot water consumption in winter was shown. Time variations of hot water consumption based on the measurements were compared with the results of questionnaire.
