Abstract
The investigations on indoor temperature in various types of houses in Tohoku District have been continued since 1978. In this paper, the results of all investigated houses measured by the common method are totally analysed. The number of investigated houses is 139 units. These houses are devided into six types. The main results of this study are as follows : (1) The living room is only heated in almost all houses. The room temperature of 1.1 meter above the floor is 15 to 25℃ when the outdoor temperature is 0℃. (2) The vertical temperature gradient in the living room is so high. The ratio of vertical temperature difference to the indoor-outdoor temperature difference is 1/5 to 1/2 for all houses except the houses with a floor heating system. The ratio for the house with a floor heating system is near zero. (3) The temperature difference between the heated living room and the other unheated rooms is considerably high. The ratio of the difference to the indoor-outdoor temperature difference is scattered in the range of 0.2 to 0.9 in the main bedroom and in the range of 0.1 to 0.8 in the corridor and lavatory. (4) The lowest living room temperature early in the morning based on the outdoor temperature is 3 to 20℃. That of highly insulated houses is high. (5) The characteristics of temperature fluctuation of highly insulated houses with a floor heating system is so different from other houses. The indoor thermal environmnet is very good because the vertical temperature difference is low and the room temperature in the early morning is maintained to be high. Lastly, the indices of indoor thermal environment were devided into five ranks on the base of this investigation.
