Abstract
The energy saving analysis of the photovoltaic array and the solar collectors for domestic hot water installed on the roof of a detached house built in built-up area were simulated by TRNSYS and its module, MASK (Type68), which reflected the sun-shade of circumferential buildings. The results are as follows: The installation of the solar collectors for domestic hot water in consideration of quantity of hot water supply of daily use may be prior in order to get the maximum energy saving. Japanese government must pursue the popularization of the solar collectors in order to valid the CO_2 exhaust reduction by solar energy use, which has been reported by Kyoto protocol.
