STUDY ON OPERATION STRATEGY OF PV/T-MEDIUM-DEEP GROUND SOURCE HEAT PUMP HEATING SYSTEM BASED ON LOW VALLEY ELECTRICITY

Li Jiayuan; Bao Lingling; Zhang Qiang; Cao Yaqi; Cheng Bo; Jin Xuhang

doi:10.19912/j.0254-0096.tynxb.2025-0977

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (9) : 652-661. DOI: 10.19912/j.0254-0096.tynxb.2025-0977

STUDY ON OPERATION STRATEGY OF PV/T-MEDIUM-DEEP GROUND SOURCE HEAT PUMP HEATING SYSTEM BASED ON LOW VALLEY ELECTRICITY

Li Jiayuan, Bao Lingling, Zhang Qiang, Cao Yaqi, Cheng Bo, Jin Xuhang

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Abstract

To address the significant energy consumption associated with heating during winters in northern China, a residential community in Handan is examined. A model of a photovoltaic photo-thermal coupled medium-deep ground source heat pump （PV/T-GSHP） system, driven by low valley electricity, is constructed using TRNSYS software. This model takes into account the local disparities between peak and valley electricity prices. The operational strategy that utilizes low valley electricity is investigated, alongside an analysis of the soil thermal imbalance issue encountered by the ground source heat pump （GSHP） during long-term heating. The effects on heating performance are analyzed both with and without valley electricity heat storage, culminating in an evaluation of the PV/T-GSHP system concerning energy efficiency, environmental benefits, and economic viability. The findings indicate that： the optimal strategy for the PV/T-GSHP system is Scheme Ⅲ, achieving over 90% utilization of valley electricity during the heating season; the annual cumulative heat replenished to the soil is 976.82 kW·h more than the heat extracted from the soil, maintaining the soil thermal balance; energy consumption is reduced by up to 74.93% compared to conventional systems; CO₂ emissions can decrease by as much as 74.94%, and operational costs may drop by up to 77.27%.

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renewable energy / heat pump system / heating / TRNSYS / peak and valley tariffs / medium-deep geothermal

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Li Jiayuan, Bao Lingling, Zhang Qiang, Cao Yaqi, Cheng Bo, Jin Xuhang. STUDY ON OPERATION STRATEGY OF PV/T-MEDIUM-DEEP GROUND SOURCE HEAT PUMP HEATING SYSTEM BASED ON LOW VALLEY ELECTRICITY[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 652-661 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0977

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