研究目的
To investigate the refrigeration performance and operating characteristics of a photovoltaic thermal heat pump system with a novel roll-bond photovoltaic thermal unit during summer in northern China.
研究成果
The PVT heat pump system demonstrated effective refrigeration performance for building space cooling in summer, with stable operation under various weather conditions. The system's design and operational strategy provide a viable solution for integrating renewable energy into building energy systems in northern China.
研究不足
The study's findings are specific to the summer conditions in northern China and may not be directly applicable to other climates or seasons. The system's performance is influenced by meteorological conditions, particularly solar and long-wave radiation.
1：Experimental Design and Method Selection:
The study focused on the refrigeration mode of the PVT heat pump system, emphasizing the novel roll-bond photovoltaic thermal unit's role as a condenser. The system's performance was evaluated under various weather conditions.
2：Sample Selection and Data Sources:
The experimental setup included four roll-bond photovoltaic thermal units, a 1 horsepower heat pump unit, and a 600 L ice storage tank. Environmental parameters like solar radiation intensity, ambient temperature, and humidity were recorded.
3：List of Experimental Equipment and Materials:
Equipment included Pt100 temperature sensors, ZDR-20 temperature loggers, CYYZ11-H pressure sensors, and a KEITHLEY 2700 data collector.
4：Experimental Procedures and Operational Workflow:
The system's refrigeration performance was monitored continuously under different weather conditions, focusing on the chilled water and ice processes.
5：Data Analysis Methods:
Performance indexes like cooling power, cumulative refrigeration capacity, and coefficient of performance were calculated. Uncertainty analysis was conducted based on error propagation theory.
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