半圆形漫反射板对储热式真空管集热性能的影响  

THE INFLUENCE OF THE SEMICIRCLE DIFFUSION REFLECTOR TO THE THERMAL EFFICICENCY OF THE THERMAL STORAGE GLASS-METAL EVACUATED SOLAR COLLECTOR

作　　者：何汉峰[1] 季杰[1] 何伟[1] 

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》2006年第6期582-587,共6页Acta Energiae Solaris Sinica

摘　　要：从理论上推导出单根储热式玻璃-金属真空管在有、无漫反射板两种不同情况下的晴天模型。利用该模型计算出理论的瞬时热效率及平均热效率，并确定半圆形漫反射板与真空管的最佳距离。同时通过实验对该真空管在有、无半圆形漫反射板两种不同的情况下的热效率进行对比。理论和实验表明，加置漫反射板以后，真空管的热效率提高了6．8％～24．2％，半圆形漫反射板与真空管的最佳距离约为1倍管径。A theoretical method of estimating the instantaneous thermal efficiency and day average thermal efficiency of a heat storage glass-metal evacuated solar collector with and without semicircle diffusion reflector was presented, which shows that the thermal efficiency of the solar collector with diffusion reflector is 6.8 %-24.2 % higher than without in the sunshiny day. The optimum collector-reflector distance for the maximum thermal efficiency of the evacuated solar collector with semicircle diffusion reflector was calculated, which is about the diameter of the tube.

关 键 词：储热式玻璃-金属真空管 半圆形漫反射板 最佳距离 热效率 

分 类 号：TK512[动力工程及工程热物理—热能工程]