An Experimental Study on the Thermal Performance Evaluation of SCW Ground Heat Exchanger

In recent years, application of the standing column well (SCW) ground heat exchanger (GHX) has been noticeably increased as a heat transfer mechanism of ground source heat pump (GSHP) systems with its high heat capacity and efficiency. Determination of the ground thermal properties is an important t...

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Bibliographic Details
Published in:International journal of air-conditioning and refrigeration 2017, 25(1), , pp.1-13
Main Authors: Chang, Keun Sun, Kim, Min Jun, Kim, Young Jae
Format: Article
Language:English
Subjects:
Bleeding
Boreholes
Configuration management
Flow velocity
Heat exchangers
Heat pumps
Heat transfer
Parameters
Performance evaluation
Thermal conductivity
Thermal resistance
Thermal response
Thermodynamic properties
기계공학
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Summary:In recent years, application of the standing column well (SCW) ground heat exchanger (GHX) has been noticeably increased as a heat transfer mechanism of ground source heat pump (GSHP) systems with its high heat capacity and efficiency. Determination of the ground thermal properties is an important task for sizing and estimating cost of the GHX. In this study, an in situ thermal response test (TRT) is applied to the thermal performance evaluation of SCW. Two SCWs with different design configurations are installed in sequence to evaluate their effects on the thermal performance of SCW using a single borehole. A line source method is used to derive the effective thermal conductivity and borehole thermal resistance. Effects of operating parameters are also investigated including bleed, heat injection rate, flow rate and filler height. Results show that the effective thermal conductivity of top drawn SCW (Type A) is 11.7% higher than that of bottom drawn SCW (Type B) and of operating parameters tested bleed is the most significant one for the improvement of the thermal performance (40.4% enhanced in thermal conductivity with 10.9% bleed).
ISSN:2010-1325
2010-1333
DOI:10.1142/S2010132517500067