Online First

New. Renew. Energy

[ Article ]
New & Renewable Energy
Abbreviation: New. Renew. Energy
ISSN: 1738-3935 (Print) 2713-9999 (Online)
Online publication date 09 Aug 2021
Received 10 Jun 2021 Revised 05 Jul 2021 Accepted 06 Jul 2021
DOI: https://doi.org/10.7849/ksnre.2021.0013

암반 대수층에서 개방형 지열 시스템의 개발 및 적용
심병완1) ; 김성균2), * ; 최한나2) ; 이수형1) ; 하규철3) ; 김용철4)

Development of a Groundwater Source Heat Pump in a Fractured Rock Aquifer
Byoung Ohan Shim1) ; Seong-Kyun Kim2), * ; Hanna Choi2) ; Soo-Hyoung Lee1) ; Kyoochul Ha3) ; Yongchul Kim4)
1)Principal Researcher, Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources
2)Senior Researcher, Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources
3)Head of Division, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources
4)Head of Center, Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources
Correspondence to : *kskinc@kigam.re.kr Tel: +82-42-868-3082


© 2021 by the New & Renewable Energy
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A groundwater source heat pump (GWHP) was developed in this study by adapting a borehole heat exchanger with closed-loop and open-loop systems in a new building. In the pilot test building, the air-conditioning on the second floor was designed to employ a closed-loop system and that on the third floor had an open-loop system. The GWHP design is based on the feasibility of groundwater resources at the installation site. For the hydrogeological survey of the study site, pumping and injection tests were conducted, and the feasibility of GWHP installation was evaluated based on the air-conditioning load demand of the building. The site was found to be satisfactory for the design capacity of the thermal load and water quality. In addition, the effect of groundwater movement on the performance of the closed-loop system was tested under three different operational scenarios of groundwater pumping. The performance of the system was sustainable with groundwater flow but declined without appropriate groundwater flow. From long-term observations of the operation, the aquifer temperature change was less than 2℃ at the observation well and 5℃ at the injection well with respect to the initial groundwater temperature. This pilot study is expected to be of guidance for developing GWHPs at fractured rock aquifers.


Keywords: Groundwater source heat pump, Open-loop, Closed-loop, Hydrogeology, Fractured rock aquifer
키워드: 지하수열히트펌프, 개방형루프, 밀폐형루프, 수리지질, 암반 대수층