抄録
The objective of this study is to estimate introduction of solar water heaters. The installation potential is related to the cost of the device and the reduction of hot water supply currently produced by fuel. First of all, the maximum annual energy cost savings corresponding to roof orientation were estimated to find optimum angle of the installation. The adoption possibility of the solar water heaters were determined by the calculated annual energy cost savings taking into account user preference which was evaluated from questionnaire survey. Then, the roof orientation was investigated using GIS (geographic information system) because the performance of solar water hearts depend on the orientation. Finally, the possible energy savings were obtained for Tokyo region. The results showed that 35,000 houses would have possibility to install solar water heater in Tokyo. The CO_2 emissions would be reduced by 8500 tons by the introduction of solar water heaters. If the cost of the device could go down to half price, the potential would increase up to 94,000 houses, which would give 3times as much energy savings as the regular price gives.
