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In-Situ Thermal Response Test for Ground Source Heat Pump Application

[+] Author Affiliations
Wenzhi Cui, Quan Liao

Chongqing University, Chongqing, China

Guiqin Chang

Zhuzhou CSR Times Electric Co., Ltd., Zhuzhou, Hunan, China

Qingyuan Peng

Nanjiang Hydrogeological and Engineering Geology Brigade, Chongqing, China

Tien-Chien Jen

University of Wisconsin Milwaukee, Milwaukee, WI

Paper No. IMECE2011-63318, pp. 677-683; 7 pages
doi:10.1115/IMECE2011-63318
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 4: Energy Systems Analysis, Thermodynamics and Sustainability; Combustion Science and Engineering; Nanoengineering for Energy, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5490-7
  • Copyright © 2011 by ASME

abstract

The design and performance optimization of ground source heat pump (GSHP) systems need the exact thermal properties of the soil, such as ground thermal conductivity and capacity, and the borehole thermal resistance of borehole heat exchanger (BHE). In-situ thermal response test (TRT) is the most widely used method to determine the overall thermal physical properties of the geological structure around the borehole. A TRT experimental apparatus has been developed and thermal response test was performed in Chongqing, southwest China. Both single-U and double-U borehole heat exchangers are studied in this work. The test duration is about 70 hours. Data direct fitting and parameter estimate method are both used to determine the soil thermal conductivity and the borehole thermal resistance. The results showed that the average ground thermal conductivity of the test region for single U and double U BHE conditions are 2.55 and 2.51 Wm−1 K−1 , and borehole thermal resistance are 0.116 and 0.066 mKW−1 , respectively.

Copyright © 2011 by ASME
Topics: Heat pumps

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