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A Study on Development of a Ground-Source Heat Pump System Utilizing Cast-in-place Concrete Pile Foundation of a Building  

Hwang, Suck-Ho (Center for Sustainable Buildings, Yonsei University)
Nam, Yu-Jin (Department of Architecture, Cheongju University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.22, no.9, 2010 , pp. 641-647 More about this Journal
Abstract
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 because of their expensive installation 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 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 4.6 while cooling; rendering this system more effective in energy saving terms than the typical ASHP systems.
Keywords
Ground-source heat pump; Cast-in-place concrete pile foundation; Ground heat exchanger;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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