This paper is aimed at improving the performance of a building-integrated photovoltaic thermal (BIPV/T) system driven by a refrigerant pump. The research is aimed at optimizing and upgrading the BIPV/T system to address the shortcomings of the original system by replacing roll-bond PV/T units with improved heat transfer features. The system’s connecting form was redesigned using a liquid separator to solve the uneven distribution of the refrigerant on the PV/T facade. We proposed the variable frequency refrigerant pump that can be adjusted to suit the working condition. An experimental study was performed to analyze the electrical and thermal efficiency of the proposed system. The results show that the electrical efficiency of the BIPV/T system was 8% which is 14.3% higher than the traditional BIPV system, while in the test period, the BIPV/T system average COP was 3.4. The thermal and comprehensive efficiencies were 20% and 42%, respectively. Besides, the proposed system’s average COP was 3.7 times greater than the original BIPV/T system.

中文翻译：

---

PV/T幕墙系统电热性能改善研究

本文旨在提高由制冷剂泵驱动的建筑一体化光伏热能 (BIPV/T) 系统的性能。该研究旨在优化和升级 BIPV/T 系统，通过替换具有改进传热特性的压焊 PV/T 单元来解决原始系统的缺点。系统连接形式重新设计，采用分液器解决PV/T立面上冷媒分布不均的问题。我们提出了可根据工况进行调节的变频制冷剂泵。进行了一项实验研究，以分析所提出系统的电效率和热效率。结果表明，BIPV/T系统的电效率为8%，比传统BIPV系统提高14.3%，而在测试期间，BIPV/T 系统平均 COP 为 3.4。热效率和综合效率分别为 20% 和 42%。此外，该系统的平均 COP 是原始 BIPV/T 系统的 3.7 倍。