吸热板参数对平板太阳集热器热性能的影响  

EFFECT OF ABSORBER PLATE PARAMETER ON THERMAL PERFORMANCE OF FLAT PLAT SOLAR COLLECTOR

作　　者：高留花[1] 赵军[1] 高腾[1] 

机构地区：[1]天津大学中低温热能高效利用教育部重点实验室,天津300072

出　　处：《太阳能学报》2014年第10期2054-2059,共6页Acta Energiae Solaris Sinica

摘　　要：建立单层盖板平板太阳集热器的一维稳态数学模型,用Visual Basic语言编写程序模拟研究吸热板各参数对平板太阳集热器热性能的影响。在综合考虑集热器效率因子与金属消耗量的基础上,设集热器总热损失系数为变量,对铜铝复合平板太阳集热器的吸热板厚度与管间距进行了优化。研究表明,用导热系数大的铜板代替铝板的优势并不明显;吸热板厚度在0.3 mm以上增加时,平板太阳集热器热性能的提升很小;随着管间距的增加,平板太阳集热器性能下降;吸热板涂层的改进对于平板太阳集热器热性能的提高至关重要;排管内/外径、盖板透过率、涂层吸收率分别为0.0108/0.012 m、0.916、0.89时,在全年运行的平均工况下,保证集热器效率因子为0.9,优化得到吸热板厚度、管间距分别为0.25 mm、11 cm时,金属材料消耗量最小,为2.27 kg/m2。A one-dimensional steady state mathematic model of single glazed flat plate solar collectors （FPC） was proposed. The effect of absorber plate parameters on thermal performance of FPC was simulated by program written in Visual Basic. Taking overall heat loss coefficient of collector as a variable quantity, absorber plate thickness and tube spacing of copper-aluminum FPC were optimized based on efficiency factor and metal consumption of collector. The results indicate that the advantage of using copper plate with high thermal conductivity instead of aluminum plate is not obvious. When absorber plate thickness is beyond 0. 3 mm, thermal performance of FPC doesn＇ t increase much with the increasing of plate absorber thickness. Thermal performance of FPC decreases along with the increasing of tube spacing. Improvement of absorber plate coating is of crucial importance to enhance thermal performance of FPC. When outer diameter of the parallel tubes is 0. 012 m, inner diameter is 0. 0108 m, transmittance of the glazed pate is 0. 916, and absorption rate of coating is 0.89, respectively, the optimization results show that the metal consumption of 2. 27 kg/m2 is minimum for F＇ = 0. 9 while absorber plate thickness is 0. 25 mm and tube spacing is 11 cm at the average operating conditions throughout the year.

关 键 词：平板太阳集热器 吸热板 热性能 集热器效率因子 模拟 优化 

分 类 号：TK512[动力工程及工程热物理—热能工程]