2007 年 72 巻 622 号 p. 65-71
It can be said that to improve energy efficiency of a room air conditioner is effective to reduce household energy consumption for heating and cooling, and CO_2 emission. However, many problems have remained unclear such as part load characteristic of air conditioner, or the relation between outdoor temperature and COP. In this paper, we conducted COP measurement in various conditions (heating/cooling load rate, outdoor temperature, indoor humidity etc.) in the artificial climate chamber. The measured COP was compared to the theoretical COP calculated from the measured refrigerative temperature. We clarified the mechanism that COP and the heating/cooling capacity changed by outdoor temperature, indoor humidity and part load ratio. The COP curve which fluctuated according to the outdoor temperature etc. was shown based on the measurement result and the prediction formula.