带遮热板热管式真空管集热器的分析  

EXERGY ANALYSES OF HEAT PIPE EVACUATED TUBE COLLECTOR WITH HEAT SHIELD

作　　者：钟帅 裴刚[1] 王其梁 杨洪伦 Zhong Shuai;Pei Gang;Wang Qiliang;Yang Honglun(Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China)

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027

出　　处：《太阳能学报》2021年第5期295-301,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51776193)。

摘　　要：采用分析的方法,对有、无遮热板热管式真空管集热器进行研究。建立集热器的热损和分析模型,并利用实验对模型进行验证。对比2种集热器的效率,并探究辐照度和工作温度对带遮热板集热器效率的影响。结果表明:增加遮热板可提高热管式真空管集热器的效率,当辐照度为800 W/m^(2)、工作温度为80℃和180℃时,效率绝对值分别提高0.8%和4.7%;当辐照度为800 W/m^(2)时,增加遮热板使得最大效率从14.6%增至17.5%,最大效率对应工作温度从135℃升至156℃;效率提高的主要原因是:增加遮热板使得玻璃管和吸热板的辐射不可逆性损失大幅下降。带遮热板集热器的参数研究表明:辐照度越大,效率越高,并且最大效率对应工作温度升高;工作温度越高,效率受辐照度影响越大。The study used an exergy analysis model to investigate two different heat pipe evacuated tube collectors(HPETCs)with and without a heat shield.The heat loss and exergy analysis models of HPETCs were established,and verified by experimental results.The exergy efficiencies of the two different HPETCs were compared.In addition,the effects of the solar irradiance and operating temperature on the exergy efficiency of HPETC with a heat shield were also explored.The results showed that the inserted heat shield in the heat pipe evacuated tube can effectively enhance the exergy efficiency of the HPETC.When the solar irradiance is 800 W/m^(2),the absolute exergy efficiency of the HPETC with a heat shield can increase by 0.8%at the operating temperature of 80℃and 4.7%at the operating temperature of 80℃compared with the HPETC without a heat shield.In the case of the solar irradiance of 800 W/m^(2),furthermore,the HPETC with a heat shield can increase the maximum exergy efficiency from 14.6%to 17.5%,and the corresponding temperature increases from 135℃to 156℃.The reason for the effective enhancements of the exergy efficiency in the HPETC with a heat shield is that the heat shield plays an important role in reducing the irreversible heat losses of the glass tube and absorber plate.The parametric analyses on the HPETC with a heat shield showed that the exergy efficiency and the operating temperature corresponding to maximum exergy efficiency get higher with increasing solar irradiance,and the effect of solar irradiance on the exergy efficiency is more significant at higher temperature.

关 键 词：太阳集热器 真空管 遮热板 效率 

分 类 号：TK512[动力工程及工程热物理—热能工程]