A Study on Improving the Coefficient of Performance by Comparing Balancing Well and Standing Column Well Heat Exchange Systems

Myungkwan Lim, Kyoungbin Lim and Changhee Lee
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Myungkwan Lim: Department of Architecture Engineering, Songwon University, Gwangju 61756, Korea
Kyoungbin Lim: Department of Mechanical Engineering, Hanbat National University, Daejeon 34258, Korea
Changhee Lee: Department of Mechanical and Shipbuilding Convergence Engineering, Pukyong National University, Busan 48547, Korea

Sustainability, 2020, vol. 12, issue 24, 1-28

Abstract: This study proposed a technology to improve the performance characteristics and coefficient of performance (COP) of a geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger composed of bleed discharge water that utilizes two balancing wells using cross-mixing methods. Using the standing column well (SCW) and cross-mixing balancing well underground heat exchanger, we compared and analyzed the effective thermal conductivity characteristics and COP characteristics during heating and cooling modes. Consequently, the cross-mixing balancing well underground heat exchanger exhibited more effective thermal conductivity than the SCW underground heat exchanger, with a high COP. Therefore, suggesting the performance was improved using groundwater flow rather than SCW. The comparison and analysis results of the effective heat map characteristics using the results of the SCW and balancing well system showed that the heating operation for the SCW underground heat exchanger had better thermal conductivity characteristics than the cooling operation. In addition, regarding a balancing well underground heat exchanger, the cooling operation exhibited superior thermal conductivity characteristics. Thus, the performance was considered to have improved due to the flow of activated groundwater in the ground and the rapid heat transfer without heat accumulation.

Keywords: standing column well (SCW); thermal response test; effective thermal conductivity; thermal conductivity; balancing well; coefficient of performance (COP) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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