Energy and Exergy Analysis of a Photovoltaic-Thermal Geothermal Heat Pump Coupled with Radiant Ceiling and Fresh Air System

Yaolin Lin (), Zhenyan Bu, Wei Yang (), Melissa Chan, Lin Tian and Mingqi Dai
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Yaolin Lin: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Zhenyan Bu: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Wei Yang: Faculty of Architecture, Building and Planning, The University of Melbourne, Melbourne 3010, Australia
Melissa Chan: College of Sport, Health and Engineering, Victoria University, Melbourne 3011, Australia
Lin Tian: School of Engineering, RMIT University, Melbourne 3000, Australia
Mingqi Dai: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

Energies, 2025, vol. 18, issue 11, 1-29

Abstract: This paper presents energy and exergy studies on a photovoltaic-thermal solar-assisted geothermal heat pump coupled with a radiant ceiling system. The system utilizes renewable solar and geothermal energy. It has an independent fresh air unit that provides clean air to the space. The computer model of the system was developed under the TRNSYST environment and validated with experimental results from open literature. Distribution of the energy consumption and exergy loss of the system were analyzed. It was found that the heat pump unit consumes the largest amount of energy while the transmission and distribution system has the highest exergy loss. Under optimized operating conditions, i.e., both demand side circulation flow and source side circulation flow are maintained at 65% of the design flow rate (design loop water temperature difference of 7.0 °C), the average exergy efficiency of the whole system was found to be 37.56%, which achieves an accumulative exergy loss reduction of 16.5% compared with 100% design flow rate condition during cooling season. The optimal bearing load ratio of the ground source heat pump vs. photovoltaic-thermal system in the heating season was found to be 67%.

Keywords: solar-assisted geothermal heat pump (SAGHP); energy and exergy performance; radiant ceiling system; energy performance; optimization (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: 2025
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