摘要
建立多孔盖板型太阳能平板空气集热器的数值计算模型,利用已有实验数据验证模型的准确性。基于该数值模型研究单位面积系统风量、太阳辐射照度和集热层吸收率对集热器热性能的影响。结果表明,多孔盖板型太阳能平板空气集热器的热性能较普通平板集热器有明显改善。系统风量增大,集热效率相应地增大,而空气通过集热器的压力降也会迅速增大,从而造成系统风机耗电量增加,所以应综合考虑系统的热性能和风机耗电量,合理选择系统风量。空气温升随太阳辐射照度增大而升高,并且接近线性增长,集热效率随着辐射照度增大呈缓慢下降趋势。集热效率随着集热层吸收率增大而显著增大,且接近线性增长。
A numerical calculation model for porous cover type solar flat-plate air collector is established,and the accuracy of the model is verified by the existing experimental data.Based on the numerical model,the effects of unit area system air volume,solar irradiance and heat collection layer absorptivity on the thermal performance of the collector are studied.The results show that the thermal performance of the porous cover type solar flat-plate air collector is significantly improved compared with the ordinary plate air collector.As the air volume of the system increases,the heat collection efficiency increases accordingly,and the pressure drop of the air passing through the heat collector will also increase rapidly,resulting in an increase of the power consumption of the system fan.Therefore,the thermal performance of the system and the fan power consumption should be considered comprehensively,and the system air volume should be selected reasonably.The air temperature rise increases with the increase of solar irradiance,and the increase is nearly linear,and the heat collection efficiency slowly decreases with the increase of solar irradiance.The heat collection efficiency increases significantly with the increase of the absorptivity of the heat collection layer,and increases nearly linearly.
作者
张旭龙
王珺
高立新
ZHANG Xulong;WANG Jun;GAO Lixin
出处
《煤气与热力》
2023年第9期22-26,共5页
Gas & Heat
关键词
多孔盖板
太阳能平板空气集热器
数值模型
空气温升
集热效率
porous cover plate
solar flat-plate air collector
numerical model
air temperature rise
heat collection efficiency
