Simulation Study for the Advanced Solar Hot Water Heating Systems
Abstract
The simulation is very important as a design tool for the solar thermal systems. Solar hot water system is expected to reduce the hot water heating load which shares more than 47% of primary energy in the residential buildings in Japan. In this study, the possibility of the advanced solar hot water heating system is examined by the simulation. A compact solar hot water heating systems with the small solar collector area and well insulated small heat storage tanks are considered. The solar heating system with smaller collector area is expected to be introduced for the building with small area of the roof or to share the installation area with PV array. The simulation result shows that the solar contribution was increased by improving the insulation of the heat storage tank. The solar contributions with the collector of 4 m2 and the heat storage tank of 150 litters using the vacuum insulation in Sapporo, Morioka, Sendai, Tokyo and Kagoshima are 0.40, 0.41, 0.46, 0.52 and 0.61, respectively. It was found that the smaller but high performance solar DHW systems are possible with the vacuum insulation for the heat storage tank.