大地の熱を利用した融雪システムと冷暖房・給湯システムの開発(<特集>地熱利用技術の研究開発最前線)

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The authors have developed the Gaia snow-melting system. The system utilizes both geothermal heat and summertime solar heat for melting snow. The first Gaia snow-melting system was installed in 1995. The total number of the system will be 17 units by the end of 2008. The systems have demonstrated around 5 of seasonal average COP of the heat pumps and reduction of the carbon dioxide emissions by 85% compared to that of electric heating cable systems. A developed air conditioning and hot water supply system was installed in 2006 in a single family house in Tsukuba. The measured seasonal average COPs of the heat pump were 3.9 and 12.0 for space heating and space cooling, respectively. The annual average COP of the heat pump for hot water production was 3.2. The annual electric power cost was \49,000 including the consumption tax. An investigation based on the measured data at the system indicated that the carbon dioxide emission can be reduced by 40% compared to that of a conventional system. An experimental study on an air conditioning system that utilizes direct expansion/condensing ground heat exchangers was initiated with the aim of reducing construction costs further and achieving higher COP.
2008-10-20