抛物面槽式集热器中不锈钢管和玻璃涂层铜管接收器的性能比较分析,以提高热效率

Arun C. A., Ajil C. Abhimannue, Sanchu Sukumaran
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摘要

可再生能源是最有前途的节能环保选择。抛物面槽式集热器等聚光型太阳能集热器成本低、输出温度高,可用于太阳能热能收集。本文对抛物面槽式太阳能集热器进行了实验研究。本研究建造了一个面积为 2.5´1.75 m² 的抛物槽。高度抛光的铝板用于将反射的太阳光集中到接收管的焦点线上。抛物面槽每隔一小时跟踪一次太阳位置,并将阳光集中到接收管中,以确保良好的性能。接收管内使用水作为工作流体,实验使用了 0.0072、0.0112 和 0.0158 千克/秒三种不同的质量流量。抛物面槽测试了两种集热元件,如不锈钢接收管和玻璃涂层铜接收管。根据抛物面槽接收管两端工作流体的入口和出口温度差对其性能进行了分析。评估了抛物面槽在三种不同流速下使用两种不同材料的接收管时的瞬时效率。 结果表明,玻璃涂层铜管的性能优于不锈钢接收管。在流速为 0.0158 kg/s 时,玻璃涂层铜管的瞬时效率为 71.17%,明显高于不锈钢接收管。玻璃涂层铜管防止了对流传热损失,从而提高了效率。实验表明,抛物面槽式太阳能集热器的性能在很大程度上取决于太阳光跟踪和包含接收管的焦线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative Performance Analysis of Stainless-Steel Tube and Glass Coated Copper Tube Receiver in Parabolic Trough Collectors for Enhanced Thermal Efficiency
Renewable energy is the most promising energy-saving and environmentally friendly option. The concentrating type solar collector like parabolic trough collectors can be utilized for solar thermal energy collection due to low cost and high-temperature output. The paper is an experimental study of a solar parabolic trough collector with manual sun tracking. A parabolic trough with an area of 2.5´1.75 m² was constructed for the present study. A highly polished aluminum sheet for concentrating the reflecting sunlight to the focal line contains the receiver tube. The parabolic trough was tracked at regular interval of one hour concerning the sun position and focused the sunlight into the receiver tube to ensure sound performance. Water is used as a working fluid inside the receiver tube, and experiments were done with three different mass flow rates of 0.0072,0.0112 and 0.0158 kg/s. Two heat-collecting elements, such as a stainless-steel receiver tube and a glass-coated copper receiver tube, were tested with a parabolic trough. The performance was analyzed based on the difference in the inlet and outlet temperature of the working fluid at the ends of the receiver tubes of the parabolic trough. The instantaneous efficiency of the parabolic trough with two different materials of receiver tube at three different flow rates were evaluated.  The results showed that the glass coated copper tube surpassed in performance compared with stainless steel receiver tubes. The instantaneous efficiency of the glass coated copper tube is found to be 71.17% at a flow rate of 0.0158 kg/s which was significantly high when compared with that of the stainless-steel receiver tube. The glass coated copper tube prevents the convective heat transfer loss and thereby increases the efficiency. The experiment shows that the performance of the parabolic trough solar collector strongly depends upon solar light tracking and the focal line containing the receiver tube.
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