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http://dx.doi.org/10.7836/kses.2012.32.3.114

Annual Performance Evaluation of Direct Expansion Vertical Closed-Loop Ground Source Heat Pump for Residential Application  

Kim, Min-Sung (Energy Efficiency Center, Korea Institute of Energy Research)
Baik, Young-Jin (Energy Efficiency Center, Korea Institute of Energy Research)
Ra, Ho-Sang (Energy Efficiency Center, Korea Institute of Energy Research)
Publication Information
Journal of the Korean Solar Energy Society / v.32, no.3, 2012 , pp. 114-122 More about this Journal
Abstract
Vertical closed-loop ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract moderate temperature level of geothermal heat in a small area. As a ground heat exchanger, a vertical closed -loop type with brine circulation is mostly preferred since it is simple and less harmful to ground environment. However, it requires a secondary heat exchange loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop, circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important parts of performance degradation. In this paper, annual and seasonal performances of direct expansion(DX) geothermal heat pump were estimated mathematically as an alternative of classical indirect geothermal heat pump based on the annual performance evaluation. As results, DX geothermal heat pump showed 43% higher annual performance than the classical U-tube geothermal heat pump.
Keywords
Geothermal heat pump; Annual performance factor; Direct expansion; Vertical-closed loop;
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  • Reference
1 MIT, The Future of Geothermal Energy, Massachusetts Institute of Technology, (2006)
2 Hadley, D.L., Phetteplace, G., Shonder, J.A., Federal Technology Alert: Ground-source heat pumps applied to federal facilities-2nd Ed., DOE/EE-0245 (PNNL-13534), Pacific Northwest National Laboratory, (2001)
3 TRNSYS, A Transient Simulation Program 15, Solar Engineering Lab., University of Wisconsin Madison, (2000)
4 KS C 9306 Standard, Air-Conditioner, (2007)
5 Sohn B., Cho C.S., Shin H.J., An H.J., Cooling and Heating Performance Evaluation of a GSHP System, Korean Journal of Air-Conditioning and Refrigeration Engineering 17(1), 71-81, (2007)
6 Kim H.Y., Yee J.J., Preparation the Standard Weather Data and TAC Map for Heating and Cooling Load Calculation in the 17-provinces of Korea, Journal of Architectural Institute of Korea 23(9), 197-204, (2007)
7 Kim S.M., Chung K.S., Park Y.C., Kim Y.H., Kim S.H., A Study of the Actual Analysis of Using Hot Water Heating in Apartment Housing with District Heating System, Proceedings of the SAREK Summer Annual Meeting, 892-898, (2007)
8 www.bitzer.de
9 Wilbert F. Stoecker, Industrial Refrigeration Handbook, McGraw-Hill, USA, (1998)
10 AHRI, Standard for Performance Rating of Variable Refrigerant Flow (VRF) Multi-Split Air-Conditioning and Heat Pump Equipment, (2009)