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

Content Provider	Springer Nature Link
Author	Luo, Jin Zhao, Haifeng Gui, Shuqiqang Xiang, Wei Rohn, Joachim
Copyright Year	2016
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 ( $$\overline{q}$$ , W/m$^{2}$) is analyzed. The monitored temperature development at the borehole wall for both types of GHEs can be perfectly explained by $$\overline{q}$$ . The finding of this study indicates that the parameter is useful in estimating ground thermal accumulation of GHEs. The larger the $$\overline{q}$$ is, the higher the possible of ground thermal accumulation and unstable performance of GHEs would be.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	22
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Energy piles Ground heat exchanger (GHE) Ground temperature response Thermal response test (TRT) Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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