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采用有限容积法研究了平板式太阳能集热器的稳态热性能,分析了环境温度、工质入口温度、集热管间距及集热管管径对平板式太阳能集热器热性能的影响。建立翼管式平板式太阳能集热器的物理模型,对该模型进行数值模拟,并将模拟结果与实验研究结果进行对比分析。研究结果表明:随环境温度升高,工质入口温度降低,可显著提高集热器的瞬时效率。太阳辐射强度为740 W/m2,环境风速为4 m/s时,环境温度从0℃增加到30℃时,集热器的瞬时效率从35.85%增加到82.19%;工质入口温度从50℃降低到10℃时,集热器的瞬时效率从23.24%增加到79.78%。减小集热管间距,增加集热管管径都有利于提高集热器的瞬时效率。太阳辐射强度为740 W/m2,环境风速为4 m/s时,集热管间距从180 mm减小到40 mm时,集热器瞬时效率从58.23%增加到65.78%;集热管管径从8 mm增加到20 mm时,集热器瞬时效率从59.47%增加到66.78%。该研究结果有利于对平板式太阳能集热器的设计参数进行优化设计。
The finite-volume method was used to study the steady-state thermal performance of flat-panel solar collectors. The effects of ambient temperature, inlet temperature of working fluid, collector spacing and tube diameter on the thermal performance of flat-panel solar collectors were analyzed. The physical model of the wing-tube flat-plate solar collector is established, and the model is numerically simulated. The simulation results are compared with the experimental results. The results show that with the increase of ambient temperature, the inlet temperature of working fluid decreases, which can significantly improve the instantaneous efficiency of the heat collector. When the solar radiation intensity was 740 W / m2 and the ambient wind speed was 4 m / s, the instantaneous efficiency of the collector increased from 35.85% to 82.19% when the ambient temperature increased from 0 ℃ to 30 ℃. The inlet temperature of working fluid increased from 50 ℃ Lowering to 10 ° C, the instantaneous efficiency of the collector increased from 23.24% to 79.78%. Reduce the collector pipe spacing, increase the collector pipe diameter are conducive to improve the instantaneous efficiency of the collector. When the solar radiation intensity is 740 W / m2 and the ambient wind speed is 4 m / s, the instantaneous efficiency of the collector increases from 58.23% to 65.78% when the collector spacing decreases from 180 mm to 40 mm. The diameter of the collector pipe increases from 8 When mm increased to 20 mm, the instantaneous efficiency of the collector increased from 59.47% to 66.78%. The results of this study are helpful to optimize the design parameters of flat panel solar collectors.