Effect of the heat load distribution on thermal performance predictions of ground heat exchangers in a stratified subsurface

2019 ◽  
Vol 141 ◽  
pp. 340-348 ◽  
Author(s):  
Wenxin Li ◽  
Xiangdong Li ◽  
Yong Wang ◽  
Ruiqing Du ◽  
Jiyuan Tu
Keyword(s):  
Thermal Performance ◽  
Heat Exchangers ◽  
Load Distribution ◽  
Heat Load ◽  
Ground Heat Exchangers ◽  
Performance Predictions

Performance and Economic Evaluation of Ground Heat Exchangers

2013 ◽  
Vol 838-841 ◽  
pp. 1913-1916 ◽  
Author(s):  
Seok Yoon ◽  
Nam Hyun Cho ◽  
Gyu Hyun Go ◽  
Seung Rae Lee
Keyword(s):  
Thermal Performance ◽  
Heat Exchangers ◽  
Construction Cost ◽  
Performance Tests ◽  
Operation Condition ◽  
Partially Saturated ◽  
Ground Heat Exchangers ◽  
Loop Design ◽  
Design Program ◽  
Construction Condition

This paper presents experimental study on the evaluation of thermal performance of U and W type ground heat exchangers (GHEs). These GHEs were installed in a partially saturated landfill ground which was composed of silt and clay in the runway area of Incheon International airport. Thermal performance tests (TPTs) were conducted for 100 hours under the continuous operation condition. Heat exchange rate of individual GHE was evaluated from the TPT results, and construction cost was also estimated. The required Borehole length of U and W type GHEs was calculated considering real construction condition from GLD (ground loop design) program.

scholarly journals Thermal Performance Analyses of Multiborehole Ground Heat Exchangers

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
Wanjing Luo ◽  
Changfu Tang ◽  
Yin Feng ◽  
Pu Miao
Keyword(s):  
Thermal Performance ◽  
Heat Exchangers ◽  
Geothermal Energy ◽  
Greenhouse Gas Emission ◽  
Energy Resource ◽  
Thermal Dissipation ◽  
Uniform Heat Flux ◽  
Fluid Temperature ◽  
Cooling Mode ◽  
Ground Heat Exchangers

Geothermal energy known as a clean, renewable energy resource is widely available and reliable. Ground heat exchangers (GHEs) can assist the development of geothermal energy by reducing the capital cost and greenhouse gas emission. In this paper, a novel semianalytical method was developed to study the thermal performance of multiborehole ground heat exchangers (GHEs) with arbitrary configurations. By assuming a uniform inlet fluid temperature (UIFT), instead of uniform heat flux (UHF), the effects of thermal interference and the thermal performance difference between different boreholes can be examined. Simulation results indicate that the monthly average outlet fluid temperatures of GHEs will increase gradually while the annual cooling load of the GHEs is greater than the annual heating load. Besides, two mechanisms, the thermal dissipation and the heat storage effect, will determine the heat transfer underground, which can be further divided into four stages. Moreover, some boreholes will be malfunctioned; that is, boreholes can absorb heat from ground when the GHEs are under the cooling mode. However, as indicated by further investigations, this malfunction can be avoided by increasing borehole spacing.

Experimental thermal performance analysis of ground heat exchangers for space heating and cooling applications

2017 ◽  
Vol 113 ◽  
pp. 1168-1181 ◽  
Author(s):  
T. Sivasakthivel ◽  
Mikael Philippe ◽  
K. Murugesan ◽  
Vikas Verma ◽  
Pingfang Hu
Keyword(s):  
Performance Analysis ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Space Heating ◽  
Ground Heat Exchangers ◽  
Heating And Cooling
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