研究目的
To study the operation performance of a solar photovoltaic system assisted cooling by ground heat exchangers in arid climate, China, aiming to reduce the operation temperature of PV panels and improve PV efficiency.
研究成果
The PV-GHEs system significantly reduces panel temperature and improves PV efficiency and annual electricity yield compared to conventional PV systems. Proper design parameters and consideration of long-term ground temperature changes are crucial for optimal performance. The system shows good economic feasibility in the studied region.
研究不足
The study is site-specific, focusing on arid climate conditions in Tikanlik, China. The long-term operation may lead to ground temperature increase, potentially weakening the heat transfer efficiency. The economic feasibility is evaluated based on local conditions and may vary in other regions.
1：Experimental Design and Method Selection:
A numerical model based on the software TRNSYS was built to simulate the dynamic behavior of the PV-GHEs system. The model includes components for PV modules, ground heat exchangers, meteorological data reading, circulating water pump, control switches, and data output.
2：Sample Selection and Data Sources:
The study used typical meteorological year (TYM) weather conditions for Tikanlik, China, and validated the model with actual thermal response test data from Handan, China.
3：List of Experimental Equipment and Materials:
The system consists of solar PV panels, a ground heat exchanger (GHE), a circulating water pump, and operating controllers. The PV panels are rectangular, divided into 32 pieces, with specific dimensions and properties. The GHE is a single U-shaped high-density polyethylene pipe with specific dimensions and properties.
4：Experimental Procedures and Operational Workflow:
The system starts cooling when the panel temperature exceeds 50°C, using water circulation to transfer heat to the ground through GHEs, and stops when the temperature drops below 48°C.
5：Data Analysis Methods:
The performance was evaluated based on panel temperature reduction, PV efficiency improvement, and annual electricity yield increase. Sensitivity analysis was conducted on environmental, geological, and design parameters.
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