Performance Analysis of Solar-Assisted Ground-Coupled Heat Pump Systems with Seasonal Thermal Energy Storage to Supply Domestic Hot Water for Campus Buildings in Southern China

Jin Zhou, Zhikai Cui, Feng Xu and Guoqiang Zhang
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Jin Zhou: School of Architecture, Hunan University, Changsha 410082, China
Zhikai Cui: College of Civil Engineering, Hunan University, Changsha 410082, China
Feng Xu: School of Architecture, Hunan University, Changsha 410082, China
Guoqiang Zhang: College of Civil Engineering, Hunan University, Changsha 410082, China

Sustainability, 2021, vol. 13, issue 15, 1-23

Abstract: The supply of domestic hot water (DHW) on college and university campuses is indispensable and is also one of the main components of campus energy consumption. The density of residential patterns and similar occupancy behavior of college students make it economical to use centralized systems to cover the DHW demand, and utilization of solar energy can make the systems more economical. Seasonal thermal energy storage (STES) is a promising key technology that can minimize the imbalance between the availability of solar energy and thermal energy demand. In this paper, a solar-assisted ground-coupled heat pump (SAGCHP) system that meets the DHW demand of 960 students was investigated by means of dynamic simulation and energy-economic analysis. The simulation results in terms of the underground heat balance are compared with a standalone GCHP system and a SAGCHP system without STES. Results show that heat recharging operations during university summer and winter breaks (when there are minimal students on campus) lead to improved underground heat balance and energy performance. Finally, a sensitivity analysis on system performance was carried out by varying solar collector arrays. It was found that there exists an optimal value of solar collector area to achieve the lowest system lifecycle cost (LCC).

Keywords: campus DHW demand; solar-assisted ground-coupled heat pump; seasonal thermal energy storage; energy performance; parametric analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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