EXERGY ANALYSIS OF SOLAR-GROUND SOURCE HEAT PUMP SYSTEM FOR GRAIN STORAGE BASED ON TRNSYS SIMULATION

Chen Yan; Yan Xilong; Dai Shiyu; Du Xiao; Xiao Zhaoran; Cui Weihua

doi:10.19912/j.0254-0096.tynxb.2024-0982

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 434-443. DOI: 10.19912/j.0254-0096.tynxb.2024-0982

EXERGY ANALYSIS OF SOLAR-GROUND SOURCE HEAT PUMP SYSTEM FOR GRAIN STORAGE BASED ON TRNSYS SIMULATION

Chen Yan, Yan Xilong, Dai Shiyu, Du Xiao, Xiao Zhaoran, Cui Weihua

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Abstract

To address the challenges of energy consumption and operational safety in grain storage buildings, a solar energy-ground source heat pump system model was developed using TRNSYS, with the China Grain Reserves Ganzhou Depot selected as a case study. The accuracy of the model was validated against actual operational data from the storage facility. Based on the simulated performance of the solar energy-ground source heat pump system during the cooling season, comprehensive analyses of the system’s electrical, thermal, and exergy characteristics were conducted. The results show that, under the most unfavorable operating conditions, the photovoltaic panels and the refrigeration unit exhibit the highest exergy losses among all system components, accounting for 54% and 36% of the total exergy loss, respectively. The fan coil units demonstrate the highest exergy efficiency at 69.64%, while the refrigeration unit shows the lowest efficiency at 26.37%. The thermodynamic perfection of the fan coil units reached a maximum of 0.96, whereas the photovoltaic panels exhibit the lowest value of 0.47. These findings indicate that the photovoltaic panels and the refrigeration unit have substantial potential for performance optimization. The overall exergy efficiency of the system is affected to be influenced by variations in outdoor air temperature. During cooling operation, the solar energy-ground source heat pump system enables the grain storage warehouse to achieve near-zero energy consumption.

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solar energy / heat pump systems / photovoltaic systems / exergy analysis / granary

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Chen Yan, Yan Xilong, Dai Shiyu, Du Xiao, Xiao Zhaoran, Cui Weihua. EXERGY ANALYSIS OF SOLAR-GROUND SOURCE HEAT PUMP SYSTEM FOR GRAIN STORAGE BASED ON TRNSYS SIMULATION[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 434-443 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0982

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