槽式太阳能真空集热管的热损失研究  

HEAT LOSS OF PARABOLIC TROUGH EVACUATED TUBULAR COLLECTOR

作　　者：龚广杰[1] 王军[1] 黄鑫炎[1] 郝梦龙[1] 张耀明[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《太阳能学报》2011年第4期517-522,共6页Acta Energiae Solaris Sinica

基　　金：江苏省科技项目(BZ2008115)

摘　　要：建立了真空集热管中吸收管与玻璃管之间热辐射和残余气体热对流、玻璃管与外界环境之间热对流和玻璃管对天空热辐射的数学模型,提出了模型的计算方法,并通过和实验数据的比较验证了模型的准确性。同时利用模型分析了几种影响热损失的主要因素,分析结果表明:吸收管温度越高,热损失越大;环境温度越低,风速越大,热损失越大,但影响很小;选择性吸收涂层的发射率是影响热损失的主要因素;真空度对热损失也有很大影响。Mathematical model of radiation and residual gas convection heat transfer from absorber to glass envelope, convection and radiation heat transfer from glass to ambient was established, the calculation method of the model was also proposed in this paper, and the accuracy of the model was verified by comparing with experimental results. Several major factors that can irrfluenee heat loss were analysed using this model. The results show that the heat loss is much more when the ab- sorber temperature is higher; lower ambient temperature and higher wind speed will cause more heat loss, but not very much; the emittanee of the selective coating is a key factor to heat loss; vacuum level will also influence heat loss a lot.

关 键 词：真空集热管 热损失模型 吸收管 发射率 真空度 

分 类 号：TK513.3[动力工程及工程热物理—热能工程]