飲食店街区における太陽熱・地中熱ハイブリッド熱源システムの実測評価と改善提案

抄録

In this paper, we measured a solar-thermal and ground-thermal hybrid energy system in Honjo city. In this system, hot water warmed by solar-thermal is used to back up the hot water supply. It is also used as a heat source for an adsorption refrigerator. From the ground-thermal heat pump, hot water and cool water are supplied to restaurants. Energy utilization factor in this energy supply system is as low as 0.5 in the summertime. In July 2018, there was a problem that air conditioning did not work under the influence of intense heat. We investigated the cause and found that the capacity of the heat pump has about 30 kW of power shortage. In order to improve the energy supply system, we investigated whether an adsorption type refrigerator is necessary and calculated the number of solar heat collectors required. Results showed that the adsorption refrigerator only lowered the ground temperature by about 1 to 2°C and the optimum number of collectors is seven.