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30,973,000 Yen (FY1993 10,324,000 Yen)
To investigate the use of solar energy two types of low energy model house were designed and observed data was analyzed to clarify the heat performance and living conditions. Solar heat collecting system was designed to form part of the roof construction. As a result the durability of solar heat collector increased remarkably. Heating efficiency is also increased through a heat reservoir under the floor. Observed overall reduction rate of kerosene is approximately 50%.
The data observed from natural energy using house was analyzed. Observed living room temperature showed small daily variation and higher difference with outside temperature due to the super insulation and low infiltration of house and natural energy system such as passive solar material and cool tube.In day time electricity which generated by solar battery on the roof was used to drive the fan of this cool tube system. Conversion efficiency of this solar battery system was approximately 11%.
To clarify the usefulness of solar energy two types of passive solar houses were designed and thermal performance were discussed. It was found that the passive solar system is useful to reduce household energy consumption covering the wide area of Japan.
In considering Eco-house system human feeling in the room is another important aspects. To investigate this artificial wind flow system was applied for super insulated and low infiltrated model house. Observed result showed that even if room temperature goes up more than 27 degree C comfort zone is observed if wind speed is 0.4 to 0.6 m/s .Energy consumption of this artificial wind flow system is one tenth comparing with electric cooler in summer season.
Solar Energy, Heat Reservoir, Passive Solar System, Eco-House