JP Journal of Heat and Mass Transfer
Volume 13, Issue 4, Pages 559 - 573
(November 2016) http://dx.doi.org/10.17654/HM013040559 |
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THERMAL RESPONSE PERFORMANCE OF THE HEAT EXCHANGER OF A STANDING COLUMN WELL BASED ON THE LOCATION OF THE RETURN PIPE
Sanghoon Lee, Changhee Lee, Hoonyoung Moon, Jongan Jeong, Younsin Lee, Hangwoo Kim, Jaeho Han and Sungjin Jo
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Abstract: In this study, mobile measurement devices and a thermal response test for the application of a standing column well (SCW)-type heat exchanger have been developed for obtaining design parameters from on-site measurements. The main objective of this study is to determine the effect ​​of the in situ thermal conductivity and thermal resistance of the ground, including the flow and effect of natural convection of groundwater in a borehole. Constant heating power is injected into the SCW through the test rig, and the gradient temperature of the SCW is recorded. These temperature data are analyzed using a source model that indicates the values of the effective in situ thermal resistance and thermal conductivity of rocks. The thermal resistance and thermal conductivity were, respectively, ~44.91% and ~6.56% higher in the lower return pipe than in the upper return pipe. |
Keywords and phrases: standing column well (SCW), thermal response test, thermal resistance, effective thermal conductivity. |
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