KIEAE Journal

Korea Institute of Ecological Architecture and Environment (한국생태환경건축학회)
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Feasibility Study of High-Efficiency Ground Heat Exchanger using Double U-tube through a Real-Scale Experiment

  • Bae, Sangmu (Dept. of Architectural Engineering, Pusan National Univ.) ;
  • Kim, Jaemin (Dept. of Architectural Engineering, Pusan National Univ.) ;
  • Nam, Yujin (Dept. of Architectural Engineering, Pusan National Univ.)
  • Received : 2017.07.24
  • Accepted : 2017.08.18
  • Published : 2017.08.30
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Abstract

Purpose: The use of renewable energy system is essential for building energy independence and saving energy consumption in the building sector. Among renewable energy technologies, ground source heat pump(GSHP) system is more energy-efficient and environmental-friendly than other heat source systems due to utilize stable ground heat source. However, the GSHP system requires a high initial installation cost and installation space in limited urban area, so it is difficult to have superiority in the market of heat source system. Therefore, it is necessary to develop the installation method of low-cost and improve system performance. This paper aims to evaluate the performance of double u-tube ground heat exchanger(GHX) and verify system feasibility through real-scale experiment. Method: In this study, the real-scale experiment of vertical closed-type GSHP system was conducted using double u-tube GHX and high-efficiency grout. Through the verification experiment, heat source temperature, heat exchange rate(HER) and seasonal performance factor(SPF) were measured according to the long-term operation. In addition, the feasibility analysis was conducted comparing to the single u-tube system. Result: In the results of experiment, average HER was 136.27 W/m and average SPF was 5.41. Furthermore, compared to the single u-tube, the installation cost of the developed system could be reduced about 70% in the same heating load condition.

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References

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