Solar power tower system with an external receiver is one of the most promising technologies for electricity generation and has a high concentration ratio and a high operating temperature range. In this paper, a lab-scale external receiver with xenon lamps, using molten salt as a heat transfer fluid, was established, and its optical and thermodynamic properties were evaluated. Experimental and numerical methods were used to analyze the performance of the receiver. For the base case (100% light power, no wind, 2.3 kg/s mass flow, and 400 °C inlet temperature), the deviation in the maximum temperature of the wall determined through numerical simulation and thermal imager measurement was 1.8%; the deviation in the back temperature of the receiver identified through simulation and thermocouple measurement was 0.22%. The performance of the receiver under different working conditions was also explored. Experimental and simulation results had good agreement at different mass flow rates, light power, and wind speed, and the deviation under each condition was less than 5%. The experimental results showed that the temperature rise of molten salt increased from 4.3 °C to 7.4 °C when the inlet temperature increased from 375 °C to 500 °C; the temperature rise of molten salt increased from 1.8 °C to 5.3 °C when the power of the xenon lamps increased from 20% to 100%; the temperature rise of molten salt decreased from 8.3 °C to 5.3 °C when the mass flow rate increased from 1.4 kg/s to 2.3 kg/s; and the temperature rise of molten salt decreased from 5.3 °C to 3.6 °C when the wind velocity increased from 0 to 10 m/s. The practical and simulation results present useful reference sources for fellow researchers and practitioners in the sector of the solar power tower system.

中文翻译：

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实验室规模的外部太阳能接收器的实验和数值评估

具有外置接收器的太阳能塔式系统是最有前途的发电技术之一，具有高聚光比和高工作温度范围。在本文中，建立了一个实验室规模的氙灯外部接收器，使用熔盐作为传热流体，并对其光学和热力学性能进行了评估。实验和数值方法被用来分析接收机的性能。对于基本情况（100% 光功率、无风、2.3 kg/s 质量流量、400 °C 入口温度），通过数值模拟和热像仪测量确定的墙体最高温度偏差为 1.8%；通过仿真和热电偶测量确定的接收器背面温度偏差为0.22%。还探讨了接收器在不同工作条件下的性能。实验与仿真结果在不同质量流量、光功率、风速下具有较好的一致性，各条件下的偏差均小于5%。实验结果表明，当入口温度从375℃升高到500℃时，熔盐温升从4.3℃升高到7.4℃；当氙灯的功率从20%增加到100%时，熔盐的温升从1.8°C增加到5.3°C；当质量流量从1.4 kg/s增加到2.3 kg/s时，熔盐温升从8.3 ℃下降到5.3 ℃；当风速从 0 增加到 10 m/s 时，熔盐的温升从 5.3 °C 下降到 3.6 °C。