Abstract

This experimental study presents the thermal efficiency enhancement of a parabolic trough solar collector (PTSC) system using different refractive surfaces and various mass flow rates. Two PTSC models were used to compare the aluminium sheet (AS) and silver chrome film (SCF) under the weather conditions of Hungary. Initially, similarity tests of the two collectors were carried out using the aluminium reflective surfaces with a mass flow rate of 90 L/h. According to the test results, the average thermal efficiency between collectors did not exceed 0.3%. Afterwards, the PTSC was compared with an evacuated U-shaped glass tube at different mass flow rates, namely 30, 60, 90, and 120 L/h. According to the experimental results, the maximum heat removal factor of PTSC for both SCF and AS at 120 L/h was 58.59% and 46.02%, respectively. Moreover, the maximum thermal efficiency with AS obtained for 120, 90, 60, and 30 L/h mass flow rates reached 27%, 22.84%, 18.9%, and 14.86%, respectively. Likewise, the maximum thermal efficiency with SCF at these mass flow rates attained 46.84%, 39.73%, 37.47%, and 33.68%, respectively. Conclusively, the PTSC thermal performance using SCF is superior to that of AS regardless of mass flow rate.

中文翻译：

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不同反射材料提高抛物面槽式太阳能集热器热效率的实验研究

摘要

本实验研究展示了使用不同折射表面和不同质量流量的抛物面槽式太阳能集热器 (PTSC) 系统的热效率增强。使用两个 PTSC 模型来比较匈牙利天气条件下的铝板 (AS) 和银铬膜 (SCF)。最初，使用质量流量为90 L/h的铝反射面对两种集热器进行相似性测试。根据测试结果，集热器之间的平均热效率不超过0.3%。然后，将 PTSC 与不同质量流量（即 30、60、90 和 120 L/h）下的真空 U 形玻璃管进行比较。根据实验结果，SCF和AS在120 L/h下的PTSC最大排热系数分别为58.59%和46.02%。此外，在120、90、60和30 L/h质量流量下获得的AS最大热效率分别达到27%、22.84%、18.9%和14.86%。同样，在这些质量流量下，SCF 的最大热效率分别达到 46.84%、39.73%、37.47% 和 33.68%。总之，无论质量流量如何，使用 SCF 的 PTSC 热性能均优于 AS。