APPLICATION OF THE DATABASE ON INDOOR ENVIRONMENT OF DETACHED HOUSES IN AND AROUND NAGANO CITY AREA : Annual energy consumption of well-insulated and airtight houses

Abstract

Newly constructed residential houses in Japan are better insulated and more airtight than their predecessors to increase energy conservation. Although reduced energy consumption was expected, the energy performance of these buildings has not yet been measured. Therefore, the indoor environment and energy consumption in fifty-one well-insulated and airtight houses newly constructed in the Nagano City Area, were investigated through a questionnaire survey and a field measurement. The information was extracted from the database on indoor environment of residential houses in Nagano Prefecture, which has been built by authors from 1980's. This paper reveals the characteristics of indoor thermal environment and energy consumption in the investigated houses. Also, the relationship between energy consumption for space heating and the influencing factors on energy consumption is discussed.