西安建筑科技大学学报(自然科学版)

受到高原地区气压低、空气密度小、大气透明度高等特殊环境影响,平板太阳能集热器表面对流和辐射热损失发生一定变化,这对集热器在高原地区的实际应用产生一定影响.该研究通过对平板太阳能集热器传热过程进行分析,考虑不同海拔高度下对流及辐射换热机制,选取了位于不同海拔的典型城市,对平板太阳能集热器的对流、辐射和总热损失进行数值模拟分析.结果表明:随海拔高度升高,平板集热器的对流热损失系数减小,辐射热损失系数增大; 而由于对流和辐射热损失系数的变化程度不同,总热损失系数随海拔高度先减小而后增大,最大变化约在10%.研究为不同海拔高度平板集热器热利用提供计算依据.

Due to the special environmental impacts of low air pressure, low air density and high atmospheric transparency in plateau area, the convective and radiative heat loss of flat plate solar collectors change to some extent, which has a certain impact on the practical application of collectors in plateau area. In this study, by analyzing the heat transfer process of flat plate solar collector and considering the convective and radiative heat transfer mechanism at different altitudes, typical cities at different altitudes are selected to simulate the convective, radiative and total heat loss of flat panel solar collector. The results show that with the increase of altitude, the convective heat loss coefficient of the flat plate collector decreases, and the radiation heat loss coefficient increases. However, due to the different variation degrees of convection and radiation heat loss coefficients, the total heat loss coefficient decreases first and then increases with the altitude, and the maximum change is about 10%. The study provides calculation basis for heat utilization of flat plate collectors at different altitudes.

引言
1 高海拔地区平板集热器传热模型
2 平板集热器传热仿真计算
3 结果分析
4 结论

图1 平板集热器主要构成及传热过程示意图<br/>Fig.1 Schematic diagram of main components and heat transfer process of flat plate collector

图1 平板集热器主要构成及传热过程示意图
Fig.1 Schematic diagram of main components and heat transfer process of flat plate collector

图2 平板集热器传热过程热网络<br/>Fig.2 Thermal network in heat transfer process of flat plate collector

图2 平板集热器传热过程热网络
Fig.2 Thermal network in heat transfer process of flat plate collector

图3 平板集热器热损失组成及其环境影响因素<br/>Fig.3 Heat loss composition and environmental factors of flat plate collector

图3 平板集热器热损失组成及其环境影响因素
Fig.3 Heat loss composition and environmental factors of flat plate collector

表1 典型城市的海拔及气压<br/>Tab.1 Altitude and air pressure of typical cities

表1 典型城市的海拔及气压
Tab.1 Altitude and air pressure of typical cities

图4 平板集热器对流热损失及热损失系数随海拔的变化<br/>Fig.4 Convective heat loss and heat loss coefficient of flat plate collector with altitude

图4 平板集热器对流热损失及热损失系数随海拔的变化
Fig.4 Convective heat loss and heat loss coefficient of flat plate collector with altitude

图5 平板集热器辐射热损失及热损失系数随海拔的变化<br/>Fig.5 Radiant heat loss and heat loss coefficient of flat plate collector with altitude

图5 平板集热器辐射热损失及热损失系数随海拔的变化
Fig.5 Radiant heat loss and heat loss coefficient of flat plate collector with altitude

图6 平板集热器总热损失系数随海拔的变化<br/>Fig.6 Total heat loss coefficient of flat plate collector with altitude

图6 平板集热器总热损失系数随海拔的变化
Fig.6 Total heat loss coefficient of flat plate collector with altitude

图7 平板集热器总热损失随海拔的变化<br/>Fig.7 Total heat loss of flat plate collector with altitude

图7 平板集热器总热损失随海拔的变化
Fig.7 Total heat loss of flat plate collector with altitude

图8 平板集热器总热损失中各组分比例随海拔的变化<br/>Fig.8 Changes of component proportions in total heat loss of flat plate collector with altitude

图8 平板集热器总热损失中各组分比例随海拔的变化
Fig.8 Changes of component proportions in total heat loss of flat plate collector with altitude

表2 不同海拔地区平板集热器总热损失系数修正系数<br/>Tab.2 Correction of total heat loss coefficient of flat plate collector at different altitudes

表2 不同海拔地区平板集热器总热损失系数修正系数
Tab.2 Correction of total heat loss coefficient of flat plate collector at different altitudes

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备注

引言

1 高海拔地区平板集热器传热模型

2 平板集热器传热仿真计算

3 结果分析

4 结论

期刊信息