Solar photovoltaic-thermal (PVT) collectors convert solar energy into both heat and electricity. The paper is to investigate the performance of solar space heating systems using PVT collectors during heating season in cold regions. In this paper, the feasibility of simulating PVT collectors with the Type50a module in TRNSYS is verified by experiment and simulation. The performance of solar space heating systems using PVT collectors with low emissivity (low-e) coating (named as low-e PVT collector) and ordinary PVT collectors on the roof of a six-story office building in Beijing were simulated by TRNSYS. The results showed that the thermal efficiency and electrical efficiency of the low-e PVT collectors were 44.77 and 11.39% respectively, while the thermal efficiency of ordinary PVT collectors in winter is very low, about 16%, so the heating system should use low-e PVT collectors. When light radiant floor heating was used in cold regions, the daily average temperature of typical room in winter was 15°C. Compared with heavy radiant floor heating, light radiant floor heating had higher outlet temperature of PVT collector and shorter delay time of floor heating. Furthermore, “Design Standard for Energy Efficiency of Public Buildings” (EEB) has been compared with the “Technical Standard for Nearly Zero Energy Buildings” (nZEB-2019), and the solar fraction factor of EEB-2015 and nZEB-2019 are 73.29 and 80.69% respectively. The building envelope according to nZEB-2019 can obtain higher room and floor temperatures. The thermal efficiency, electrical efficiency and equivalent power generation efficiency of the PVT heating system gradually decrease as the set temperature difference increases, with the thermal efficiency being the most affected. In simulation calculations, as the start-up temperature difference between the outlet temperature of the PVT collector and the room temperature above the room of the PVT heating system increases from 5 to 15°C, the thermal efficiency of the system decreases by 16.21% and the equivalent electrical efficiency decreases by 6.17%.
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The research was supported by Thermal and environmental engineering department, Shanghai Marine Equipment Research Institute.
The authors declare that they have no conflicts of interest.
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Zhou, X., Sui, Z. & Wang, X. Research on the Performance of Solar Space Heating Systems Using Photovoltaic-Thermal Collectors. Appl. Sol. Energy 59, 48–63 (2023). https://doi.org/10.3103/S0003701X22601041