Variable Water Flow Control of Hybrid Geothermal Heat Pump System

Ji-Hyun Shin, Hyo-Jun Kim, Han-Gyeol Lee and Young-Hum Cho ()
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Ji-Hyun Shin: Sustainable Planning Division, EnertecUnited, Busan 48059, Republic of Korea
Hyo-Jun Kim: Institute of Industrial Technology, Yeungnam University, Gyeongsan 38541, Republic of Korea
Han-Gyeol Lee: Department of Architecture, Graduate School of Yeungnam University, Gyeongsan 38541, Republic of Korea
Young-Hum Cho: School of Architecture, Yeungnam University, Gyeongsan 38541, Republic of Korea

Energies, 2023, vol. 16, issue 17, 1-18

Abstract: Ground heat accumulation caused by imbalanced heating and cooling loads in a building can cause the heat-source temperature to increase as the operating age of a geothermal heat pump (GHP) system increases. An alternative system to improve upon this situation is the hybrid GHP system. This study reviews existing research on GHP systems and hybrid GHP systems, variable water flow (VWF) control, and coefficient of performance (COP) prediction. Generally, constant flow control is applied to the circulating pump to provide a flow rate according to the maximum load. The need for VWF control was identified because the hybrid GHP system is used mainly as a heating and cooling heat source system for partial loads rather than the entire building load. Previous studies on predicting the COPs of GHP systems developed prediction models by selecting input values based on mathematical models, collecting data through multiple measurement points, and utilizing data from production environments. The model can be limited by the field environment, and it is necessary to predict the COP using machine learning based on existing field monitoring data.

Keywords: variable water flow control; hybrid geothermal heat pump system; coefficient of performance; prediction model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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