Abstract
The purpose of this study is to describe the possibility of heating by the heat pump system in a cold region. The indoor thermal environment and energy consumption of a super-insulated detached house in Nagano city were investigated for a year. On this house, the outdoor unit of heat pump was placed in the attic space to improve the efficiency of the heat pump air conditioner. The results of the investigation are as follows: 1) The average indoor air temperature of 150 cm above the floor in the living room is 18 to 21 degrees. 2) The suction temperature in the attic space was about 6 degrees higher than outdoor air temperature. 3) The frequency of heat pump was influenced by the suction temperature. There was a tendency that the lower the suction temperature, the higher the frequency of heat pump. 4) According to calculation, the electric energy for heating when the outdoor unit of heat pump was placed on outdoor was about 16% higher than those of the outdoor unit was placed in the attic space.
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