Optimization of Heating Operating Mode for Ground Source Heat Pump Coupled with Seasonal Solar Heat Storage

doi:10.11930/j.issn.1004-9649.202503025

Abstract

Abstract:

To address the challenges of the long-term decline of geothermal temperature in ground source heat pump (GSHP) systems and the efficiency reduction caused by the coupling of seasonal solar heat storage (SSHS), this study proposes a novel operational mode—the 'store-then-supply' (SSHS+GSHP) mode—to enhance the overall efficiency of the coupled heating system. Based on greenhouse heating experimental data, a simulation model was developed using TRNSYS to analyze the geothermal temperature variation and heating efficiency under three different modes: no-storage mode, supply-then-store mode, and store-then-supply mode. The proposed 'store-then-supply' mode leverages seasonal solar heat storage before the heating period, achieving efficient coupling of solar and shallow geothermal energy. This approach not only mitigates geothermal imbalance, but also significantly improves heating efficiency, maintaining a stable performance over a 20-year operational period. Compared with the 'supply-then-store' mode, the proposed mode improves the annual energy efficiency by approximately 4.2% to 4.4%, achieving a cumulative electricity saving of about 1.07 × 10⁴ kW·h over 20 years and an average annual saving of 534 kW·h, directly reducing the operating energy costs by 4.2%, effectively lowering system energy consumption and enhancing heating cost-effectiveness.

Key words: ground source heat pump, seasonal solar heat storage, geothermal imbalance, operating mode, efficiency improvement

RAN Yujin, PENG Jia, TIAN Xiaolin, MA Lei, SHAN Qiang, YANG Xufei, ZHANG Wei. Optimization of Heating Operating Mode for Ground Source Heat Pump Coupled with Seasonal Solar Heat Storage[J]. Electric Power, 2025, 58(11): 214-224.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202503025

https://www.electricpower.com.cn/EN/Y2025/V58/I11/214

Figures/Tables 16

References 29

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朝向	面积/m²	主要材质	厚度/mm	导热系数/ (W·(m·K)^–1)
南墙+北墙	64.00	中空玻璃	5+6+5	4.0
东墙+西墙	98.00	中空玻璃	5+6+5	4.0
顶部	125.22	钢化玻璃	5	6.4

朝向	面积/m²	主要材质	厚度/mm	导热系数/ (W·(m·K)^–1)
南墙+北墙	64.00	中空玻璃	5+6+5	4.0
东墙+西墙	98.00	中空玻璃	5+6+5	4.0
顶部	125.22	钢化玻璃	5	6.4

数据名称	仿真值	实验值^[15]	偏差
热泵供热量/(kW·h)	19043	19008	0.2%
热泵取热量/(kW·h)	13790	13419	2.7%
供暖总能耗/(kW·h)	8081	8009	0.9%
供暖后地温/℃	13.79	13.75	0.04
供暖季地温下降量/℃	0.92	0.89	–0.04

数据名称	仿真值	实验值^[15]	偏差
热泵供热量/(kW·h)	19043	19008	0.2%
热泵取热量/(kW·h)	13790	13419	2.7%
供暖总能耗/(kW·h)	8081	8009	0.9%
供暖后地温/℃	13.79	13.75	0.04
供暖季地温下降量/℃	0.92	0.89	–0.04

数据名称	仿真值	实验值^[15]	偏差
土壤蓄热量/(kW·h)	10237	10173	0.6%
集热能耗/(kW·h)	349	364	–4.1%
蓄热能耗/(kW·h)	141	144	–2.1%
跨季蓄热总能耗/(kW·h)	490	508	–3.5%
典型日集热效率/%	38.41	35.46	2.95
蓄热后地温/℃	14.35	14.31	0.04
蓄热季地温上升量/℃	1.00	0.96	0.04