Comparison of ground temperature response of energy pile and borehole heat exchanger during thermal response tests

Luo J, Zhao H, Gui S, Xiang W, Rohn J (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Environmental Earth Sciences Springer Verlag (Germany)

Publisher: Springer Verlag

Book Volume: 75

Journal Issue: 22

DOI: 10.1007/s12665-016-6267-0

Abstract

Thermal migration of ground heat exchanger (GHE) in subsurface is crucially important to the efficiency and sustainability of ground source heat pump systems. In order to investigate heat transfer efficiency of GHE, ground temperature response during system operation should be analyzed. In this paper, two types of GHEs operate under heating operating condition are simulated by thermal response test. A set of parameters including fluid temperature, borehole wall and ground temperature are monitored with duration of 148 h. The analysis of thermal performance shows that the energy pile has specific thermal rates of 147 W/m which is 230% higher than that of borehole heat exchanger with 56 W/m. Furthermore, heat flux per unit area of the contacting area at borehole wall (q¯ , W/m2) is analyzed. The monitored temperature development at the borehole wall for both types of GHEs can be perfectly explained by q¯. The finding of this study indicates that the parameter is useful in estimating ground thermal accumulation of GHEs. The larger the q¯ is, the higher the possible of ground thermal accumulation and unstable performance of GHEs would be. © 2016, Springer-Verlag Berlin Heidelberg.

Authors with CRIS profile

Joachim Rohn Professur für Angewandte Geologie und Modellierung von Umweltsystemen

Involved external institutions

China University of Geosciences / 中国地质大学 CN China (CN) China Three Gorges Corporation CN China (CN) Changjiang Institute of Survey, Planning, Design and Research (CISPDR) CN China (CN)

How to cite

APA:

Luo, J., Zhao, H., Gui, S., Xiang, W., & Rohn, J. (2016). Comparison of ground temperature response of energy pile and borehole heat exchanger during thermal response tests. Environmental Earth Sciences, 75(22). https://dx.doi.org/10.1007/s12665-016-6267-0

MLA:

Luo, Jin, et al. "Comparison of ground temperature response of energy pile and borehole heat exchanger during thermal response tests." Environmental Earth Sciences 75.22 (2016).

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