考虑聚光太阳能吸收分布的光子增强热离子发电综合能量平衡分析
Comprehensive Energy Balance Analysis of Photon-Enhanced Thermionic Power Generation Considering Concentrated Solar Absorption Distribution
摘要：
本文报道了一个全面的能量平衡分析的光子增强型电子发射（PETE）设备时，它用于聚光太阳能发电（CSP）。为此，我们考虑一个现实的PETE器件，该器件由玻璃上的掺硼硅发射极和钨上的掺磷金刚石收集极组成，两者之间由电极间真空间隙隔开。严格计算了深度相关的光谱太阳吸收及其光伏和光热能量转换过程，预测了PETE的功率输出和能量转换效率。我们的计算预测，优化后，所考虑的PETE设备的功率输出可以达到1.6 W/cm $^2$与能量转换效率的$\sim$ 18 \%的100 $\times$太阳能浓度，这是大大低于在理想条件下的预测在以前的作品。此外，光子增强比低于10，并且由于发射极的光热加热而随着太阳能浓度的增加而降低，这表明PETE可能是$\sim$ 100 $\times$浓度以下的低至中等CSP的适当能量转换过程。这些观测结果表明，基于光谱和空间太阳吸收分布的严格能量平衡分析对于准确预测PETE发电的重要性。
英文摘要：
The present article reports a comprehensive energy balance analysis of a photon-enhanced thermionic emission (PETE) device when it is used for concentrated solar power (CSP) generation. To this end, we consider a realistic PETE device composed of a boron-doped silicon emitter on glass and a phosphorus-doped diamond collector on tungsten separated by the inter-electrode vacuum gap. Depth-dependent spectral solar absorption and its photovoltaic and photothermal energy conversion processes are rigorously calculated to predict the PETE power output and energy conversion efficiency. Our calculation predicts that when optimized, the power output of the considered PETE device can reach 1.6 W/cm$^2$ with the energy conversion efficiency of $\sim$18 \% for 100$\times$ solar concentration, which is substantially lower than those predicted in previous works under ideal conditions. In addition, the photon-enhancement ratio is lower than 10 and decreases with the increasing solar concentration due to the photothermal heating of the emitter, suggesting that PETE may be an adequate energy conversion process for low-to-medium CSP below $\sim$100$\times$ concentration. These observations signify the importance of a rigorous energy balance analysis based on spectral and spatial solar absorption distribution for the accurate prediction of PETE power generation.
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