新型槽式真空热管集热器的热效率及火用效率分析  

Analysis of thermal and exergy efficiencies of new-type trough-focus solar collector

作　　者：徐吉富[1] 朱跃钊[1] 蒋金柱[1] 董宝军[1] 

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京210009

出　　处：《真空》2009年第2期74-77,共4页Vacuum

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z207)

摘　　要：本文在建立单轴跟踪槽式太阳能集热器模型的基础上,着重分析了集热装置的热效率和火用效率,并以此为基础确定各个因素,主要是槽式集热器的聚光比、光照强度、集热流体的温升对集热效率和火用效率的影响。结果表明:随着集热器聚光比和太阳光光照强度的增加,集热效率和火用效率先是急剧增加,然后逐渐趋于平缓;随着的集热流体温升的增加,集热效率逐渐减小,聚光比和光照强度越大,减小的程度越缓慢。A model was developed for a new uniaxial sunlight-tracking vacuum trough-focus solar collector with heat pipes to analyze the thermal and exerg efficiencies of the collector. Then, the main influencing factors on thermal and exergy efficiencies were presented, such as geometric concentrating ratio, illumination intensity and temperature rise of heat-collecting fluid. The results indicated that with the increasing geometric concentrating ratio and solar illumination intensity of the collectar, the thermal and exergy efficiencies both increase rapidly first then gradually tend to flat curve. When the temperature of heat-collecting fluid increases, the thermal efficiency decreases slowly, and the higher the geometric concentrating ratio and illumination intensity, the slower the decreasing rate.

关 键 词：槽式集热器 太阳能 热效率 火用效率 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]