Abstract
This paper aims at designing a simplified method to estimate the potentials of photovoltaic systems and solar water heaters in municipal scale based on public statistics. The method consists of three st eps: calculating energy demand in households, investigating potentials of the solar energy technologies and estimating the effect on primary energy reduction. This study provides functions to calculate energy consumption by household types. It was verified by the comparison with statistic data of electricity and gas consumption. Because roof areas are not available in statistics, the study found parameters to estimate roof areas from building areas. The results show that the solar energy equipment reduces energy consumption by 30-60% in detached houses in Tokyo, and that the payback year is expected less than 20 years.
