具有多层吸收体/发射体结构的柱面近场太阳能热光伏系统：集成太阳能辐射吸收与冷却能耗

Abstract Near-field radiative heat transfer enhances the intensity of the thermal radiation significantly through evanescent waves, while the combination of selective emitters can effectively improve the output power and system efficiency of solar thermophotovoltaic systems. By calculating the polariton dispersion relation between different layers and combining the energy transmission coefficient of the emitter at different layers, the mechanism by which the emitter enhances near-field radiative heat transfer was analyzed. Concurrently, a comprehensive consideration was given to the conversion of solar radiation to thermal energy, the transformation of thermal radiation into electrical energy, and the impact of the circulating water-cooling system on performance. The analysis indicates that with concentration ratio of > 70 and operating temperatures ranging from 900 K to 1200 K, the output power of near-field solar thermophotovoltaic system can achieve a range of 8905 W/m 2 to 52875 W/m 2 , and the system efficiency can be stably maintained above 20 %.