JOURNAL BROWSE
Search
Advanced SearchSearch Tips
The Effect of Construction Methods on Geothermal Exchange Rates of Cast-in-place Energy Piles
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
The Effect of Construction Methods on Geothermal Exchange Rates of Cast-in-place Energy Piles
Park, Yong-Boo; Nam, Yu-Jin; Sim, Young-Jong; Sohn, Jeong-Rak;
  PDF(new window)
 Abstract
In recent, there are many studies associated with energy piles to save initial construction cost for ground source heat pump system. In this study, to evaluate geothermal exchange rates two types (a connection type and a slinky type) of cast-in-place energy piles (PRD, 4.5m in depth, 1,200 mm in diameter) were constructed for the tests and their efficiencies were compared with numerical analysis results. As a result, starting with operation, geothermal exchange rate gradually decreases due to exchange of lower ground temperature. In the case of connection type, temperature difference is in heating mode and , in cooling mode, respectively. In addition, in case of a connection type, geothermal exchange rate in heating mode is 2,314W/m and in cooling mode, 252.2W/m whose value is 9% higher than in heating mode. In the case of slinky type, the average geothermal exchange rate in heating mode is 168.0W/m, which is about 27% lower than that of connection type.
 Keywords
Cast-in-place Energy Pile;Geothermal Exchange Rate;Cooling-Heating Mode Operation;
 Language
Korean
 Cited by
 References
1.
남유진(2011), "토양 및 지하수 조건이 지열공조시스템의 성능에 미치는 영향에 관한 수치 해석적 연구", 대한설비공학회, 23(5): 321-326.

2.
Carslaw, H. S. and J. C. Jaeger (1946), Conduction of Heat in Solids, Claremore press, Oxford.

3.
Eskilson, P. (1987), Thermal Analysis of Heat Extraction Borehole, Ph. D. Thesis, University of Lund.

4.
Kavanaugh, S. P. (1985), Simulation and Experimental Verification of Vertical Ground-coupled Heat Pump Systems, Ph. D. Thesis, Oklahoma State University, USA.

5.
Nam, Y. J., R. Ooka and S. H. Hwang (2008), "Development of a numerical model to predict heat exchange rates for a groundsource heat pump system", Energy and Buildings, 40: 2133-2140. crossref(new window)

6.
남유진(2009), 地中熱地下水利用空調システムにおける最適利用手法およびポテンシャル把握法にに關する硏究, 박사학위논문, 일본도쿄대학교(in Japanese).