Application of a heat source system using solar energy with hot water storage

Abstract

To increase the adoption and value of solar heat energy, a heat source system was designed and constructed that consists of a large-capacity water thermal storage tank, water source heat pump unit, and waste heat recovery chiller. This heat source system contributes to energy savings and to maintaining the function of a building when infrastructure is unavailable at the time of a disaster. This system was installed in a high school in Tokyo, Japan, and its effectiveness was verified. Actual results indicated that it operates at high efficiency with an average COP of 6.8 and full utilization of solar heat throughout the year. The actual annual usage of solar heat was about 103% that of the simulation at design time. The annual primary energy consumption was reduced by approximately 45% compared to that of an ordinary high school in Japan.