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An evacuated receiver partially insulated by a solar transparent aerogel for parabolic trough collector

机译：由太阳透明气凝胶部分绝缘的疏散接收器，用于抛物线槽收集器

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A modified evacuated receiver partially insulated by a solar transparent aerogel was proposed for the parabolic trough collector. An optical-thermal model was developed and validated to investigate the optical and thermal performance of the modified receiver and a traditional evacuated receiver. Firstly, it was revealed that different heat transfer modes among the aerogel, absorber and glass can obviously influence the heat loss from the absorber. Based on adjusting these modes through varying the aerogel thickness, an optimal receiver design was obtained. Then, the effects of the direct normal irradiance and the coating emittance were analyzed. Finally, the optimal receiver was compared with two existing modified receivers which are insulated by an opaque material and a radiation shield, respectively. Optical study shows that the optical efficiency of receiver just decreases by 0.16% when the aerogel thickness increases from 0 to 24.5 mm, which indicates the aerogel influences slightly on the optical performance. Thermal study indicates the modified receiver with the aerogel thickness of 20 mm has the best insulating performance. Compared with the traditional receiver, it can reduce the heat loss from the absorber by 7.3-10.1% when the inlet fluid temperature is within 583-823 K, and the direct normal irradiance is within 400-1000 W.m(-2). As a result, the receiver efficiency can be improved by 0.01-2.92%, and the collector efficiency is improved by 0.01-2.75%. Moreover, it is found that the higher the coating emittance or the fluid temperature is, more obvious the improvement in the receiver efficiency becomes. Finally, comparison of different receivers indicates the optimal receiver with the aerogel can achieve higher receiver efficiency than the two existing modified receivers under all examined typical conditions.
机译：为抛物线槽收集器提出了由太阳透明气凝胶部分绝缘的改进的抽空接收器。开发并验证了光学热模型，以研究改进的接收器和传统抽空接收器的光学和热性能。首先，揭示了气凝胶，吸收器和玻璃之间的不同传热模式显然可以影响吸收器的热量损失。基于通过改变气凝胶厚度调节这些模式，获得了最佳的接收器设计。然后，分析了直接正常辐照度和涂层粘合率的影响。最后，将最佳接收器与两个现有的修改接收器进行比较，它们分别由不透明材料和辐射屏蔽绝缘。光学研究表明，当气凝胶厚度从0到24.5毫米增加时，接收器的光学效率速度降低了0.16％，这表明气凝胶略微影响光学性能。热学研究表明，具有20mm的气凝胶厚度的改进的接收器具有最佳的绝缘性能。与传统接收器相比，当入口流体温度在583-823K内时，它可以将吸收器的热量减少7.3-10.1％，直接正常辐照度在400-1000W（-2）范围内。结果，接收器效率可以提高0.01-2.92％，收集器效率提高0.01-2.75％。此外，发现涂层施加率或流体温度越高，接收器效率的提高变得更明显。最后，不同接收器的比较指示利用气凝光的最佳接收器可以实现比在所有检查的典型条件下的两个现有的修改接收器更高的接收器效率。

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