DEVELOPMENT OF A GROUND SOURCE HEAT PUMP SYSTEM WITH GROUND HEAT EXCHANGER UTILIZING THE CAST-IN-PLACE CONCRETE PILE FOUNDATIONS OF A BUILDING
DEVELOPMENT OF A GROUND SOURCE HEAT PUMP SYSTEM WITH GROUND HEAT EXCHANGER UTILIZING THE CAST-IN-PLACE CONCRETE PILE FOUNDATIONS OF A BUILDING
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利用建筑物现浇混凝土桩基础开发带地热交换器的地源热泵系统
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Yokoi
中科院分区：
文献类型：
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作者：
R. Ooka;K. Sekine;M. Yokoi
地源(地热)热泵(GSHP)系统比传统的空气源热泵(ASHP)系统具有更高的性能系数。然而，地源热泵系统在日本并不普遍，因为它们昂贵的枯燥成本。作者开发了一种地源热泵系统，该系统利用建筑物的现浇混凝土桩基作为换热器，以降低初始钻孔成本。在该系统中，8个U型管布置在混凝土现浇桩基础的表面周围。对该系统的换热能力、地下温度变化和热泵性能进行了全尺寸实验研究。结果表明，冷却时的平均散热量为186~201W/m(每根管子25W/m)。该系统在冷却时的平均COP为4.89；使该系统在节能方面的效率是更典型的ASHP系统的1.7倍。单位取热和排热的初始建造成本为79元/瓦(约合该系统的价格为0.79美元/瓦，而现有标准钻孔系统的价格为300元/瓦(3美元/瓦)。因此，该系统有望在商业上可行。
Ground-source (Geothermal) heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that employs the cast-in-place concrete pile foundations of a building as heat exchangers in order to reduce the initial boring cost. In this system, eight U-tubes are arranged around the surface of a cast-in-place concrete pile foundation. The heat exchange capability of this system, subterranean temperature changes and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186~201 W/m (per pile, 25 W/m per pair of tubes) while cooling. The average COP of this system was 4.89 while cooling; rendering this system about 1.7 times more effective in energy saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is ¥79/W (approx. US$0.79/W) for this system, whereas it is ¥300/W (US$3/W) for existing standard borehole systems. Therefore, this system is expected to be commercially viable.