Improvement of Thermal Performance of Air Source Heat Pump for Road Heating Using Stored Heat in Structures of Subway

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  • 道路融雪における地中蓄熱利用による性能向上の研究
  • ドウロ ユウセツ ニ オケル チチュウ チクネツ リヨウ ニ ヨル セイノウ

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Abstract

A road heating system with air source heat pumps using waste heat from subway was completed in December 1987 at Sapporo-city. When the subway service is out in the midnight time, the system operates without taking waste heat from the subway. This paper evaluates the quantity of heat recovered from underground structures during the subway service out time. From the measured temperature data, the following items are clarified; 1) thermal energy stored in the structures of subway in summer and that radiated in winter season 2) in one-dimensional analysis, 0.00025m^2/h of temperature conductivity shows good agreement with the measured data of temperature distribution in the structures of subway 3) heat pump inlet air temperature rise up is evaluated for about 2〜3℃ comparing to the condition with no heat recovery 4) this temperature rise gives COP increase of 0.14 and power out put increase of 7%.

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