Performance evaluation of coaxial-type GHEX in GSHP system installed in Korean residential building
- Authors
- Lee, Seokjae; Park, Sangwoo; Kang, Minkyu; Choi, Hangseok
- Issue Date
- 15-3월-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Ground heat exchanger (GHEX); Coaxial-type GHEX; Ground source heat pump (GSHP); Thermal response test (TRT); Thermal performance test (TPT)
- Citation
- ENERGY AND BUILDINGS, v.235
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY AND BUILDINGS
- Volume
- 235
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/49473
- DOI
- 10.1016/j.enbuild.2021.110734
- ISSN
- 0378-7788
- Abstract
- A coaxial-type ground heat exchanger (GHEX) is a closed-loop GHEX with heat exchange pipes in a borehole, arranged in a concentric tube-in-tube configuration. A coaxial-type GHEX enlarges the heat exchange area and induces turbulent flow more actively than conventional closed-loop GHEXs owing to the annular space formed by outer and inner pipes. Therefore, it improves the thermal performance of conventional GHEXs. Herein, the thermal performance of the coaxial-type GHEX was evaluated, and then compared with that of the closed-loop vertical GHEX. The Ground source heat pump (GSHP) system connected with the coaxial-type GHEXs was designed with the ground loop heat exchanger design program (i.e., GLHE-Pro). In accordance with the design, the GSHP system was constructed in a building basement, with four coaxial-type GHEXs and a closed-loop vertical GHEX for comparison purpose. Then, a series of field experiments (i.e., thermal response tests (TRTs), thermal performance tests (TPTs), short-term heating COP tests, and energy saving tests) were conducted to compare the thermal performance of the coaxial-type GHEXs and the closed-loop vertical GHEX with or without the GSHP system. As a result, the coaxial-type GHEX had 20% and 6.7% better thermal performance in TRT and TPT, respectively, than the closed-loop vertical GHEX. In addition, geothermal energy showed more stable performance with the coaxial-type GHEX in the GSHP system, than with the closed-loop vertical GHEX. (c) 2021 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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