419 太陽熱利用ヒートポンプによる床下蓄熱式床暖房の研究(新エネルギー(1),環境保全型エネルギー技術)

概要

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Combined use of an air-conditioner and underfloor heating device with heat storage tanks installed in the space under the floor with the area of 10m^2 was proposed in the previous studies. Electric carpets or circulating hot water in a vinyl tube heated by solar collectors was used. In this study, it was proposed to use circulating hot water supplied directly from the condenser of a direct-expansion solar heat pump. It was found that the temperature of the returning water to the condenser was about 20 to 35℃ so that the heat pump could operate efficiently at low condensing temperature. The rated capacity of the compressor was 250W and the area of the evaporator was 1.27m^2. The floor temperature could be a little higher than the room temperature at 22℃ when the solar insolation was large. The necessary heat from the floor to the room by convection and to the walls by radiation for maintaining at a floor temperature was obtained analytically. The heat for radiative heat transfer was much larger than the heat for convective heat transfer.
社団法人日本機械学会の論文
2007-07-18