新型低热损光伏光热集热器耦合吸收式制冷系统的性能分析

Abstract Solar photovoltaic/thermal (PV/T) collector-driven absorption cooling systems offer the potential for simultaneous electricity and cooling generation. However, conventional flat-plate PV/T collectors suffer from substantial heat losses, particularly radiative and convective losses, which prevent them from reaching the medium-to-high outlet temperatures required to effectively drive absorption chillers. As a result, these systems typically require auxiliary heat sources, compromising efficiency and economic viability. To overcome these limitations, this study proposes and experimentally validates two novel low-heat-loss flat-plate PV/T collector designs: a low-emissivity PV/T collector and a vacuum low-emissivity PV/T collector. These designs integrate low-emissivity solar cell and vacuum interlayer to suppress thermal losses without the need for solar concentration or tracking systems. The performances of the proposed systems are simulated using TRNSYS, and the two types of low-heat-loss collectors are experimentally validated. Under inlet water temperatures ranging from 80 °C to 110 °C, the low emissivity collector reduces total heat loss by 25.2 % (with a 68.8 % reduction in radiative loss) compared to a conventional PV/T, while the vacuum low-emissivity collector achieves a 75.7 % total heat loss reduction. The vacuum low-emissivity system also outperforms the low emissivity configuration in monthly solar fraction across summer operating conditions. Various factors, including collector slope, water tank volume, and area, are also evaluated to enhance overall efficiency. This work offers new insight in efficient solar cooling system by reducing PV/T collector’s heat loss.