异型高温真空集热管的热损分析  

HEAT LOSS STUDY ON PROFILED HIGH TEMPERATURE EVACUATED TUBE COLLECTOR

作　　者：黄小娜 裴刚[1] 王其梁 杨洪伦 Huang Xiaona;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

出　　处：《太阳能学报》2019年第7期1805-1811,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51476159);东莞市引进创新科研团队计划(2014607101008);国家科技支撑计划(2015BAD19B02);安徽省科技厅国际科技合作计划(BJ2090130038)

摘　　要：为减少真空集热管热损,提出内吸热管次吸热面扁平设计(管型Ⅰ)和内吸热管主、次吸热面均扁平设计(管型Ⅱ)的2种异型内吸热管结构,通过减小其表面积来减少辐射热损。利用辐射换热的光谱分布模型,计算分析原型和异型真空集热管的热损,同时对原型管和管型Ⅱ的能流密度和温度分布进行模拟分析。结果表明:2种异型管相对原型管热损分别减少约8.8%、14.5%,当集热温度分别为300、400、500、600℃时,管型Ⅰ热损减少量分别为7.2、19.5、45.8和96.4 W/m,管型Ⅱ热损减少量分别为11.8、32.0、75.3和158.5 W/m;管型Ⅱ内吸热管主吸热面能流密度在可承受范围内,温度分布受结构变化影响较小。The study introduces a new parabolic trough collector(PTC)with a profiled tube in order to decrease the heat loss of evacuated tube collector by reducing the radiation area.Two types of profiled tube are analyzed.One is that the secondary heat absorbing surface is designed to be flat(tubeⅠ),and the other is that the secondary heat absorbing surface and the main heat absorbing surface are both designed to be flat(tubeⅡ).The paper presents numerical performance evaluation and comparative analyses on the heat loss of PTC with original tube and profiled tube and on heat flux and temperature distribution of original tube and tubeⅡbased on spectrum parameter model of radiation heat transfer.The results show that,the heat loss from the evacuated collector with tubeⅠand tubeⅡis less than that with original tube as much as 8.8%and 14.5%respectively.When the tube working temperature is 300,400,500 and 600℃,the heat loss reduction of PTC with tubeⅠis 7.2,19.5,45.8 and 96.4 W/m respectively,and the heat loss reduction of PTC with tubeⅡis 11.8,32.0,75.3 and 158.5 W/m respectively.In the main heat absorbing surface of tubeⅡ,heat flux is within the acceptable range,and temperature distribution is slightly affected by tube structural change.

关 键 词：太阳能吸热管 热损 能流密度 异型吸热管 温度 

分 类 号：TK512[动力工程及工程热物理—热能工程]