摘要
提出一种盖板式冲缝型集热器,将吸热板设置成冲缝型,从而在不影响集热面积的同时增大了吸热板与空气间的对流传热系数;并采用数值模拟与实验验证相结合的方法对其热性能的影响因素进行研究。对比Matlab程序模拟值和实验值,两者基本吻合,空气出口温度的平均偏差为1.1℃,说明所建立的数学模型正确,可用来深入研究该集热器。研究结果表明,对于集热器结构尺寸和物理参数,冲缝当量直径对热效率和空气进出口温差的影响最大,其次是吸热板外表面发射率、盖板内表面发射率、盖板外表面发射率、平均冲缝间距和集热器高度;对于进口参数和环境条件,空气进口温度、环境温度和室外风速对热效率和空气进出口温差的影响均非常显著,而送风量和辐射强度对空气进出口温差影响显著。总体来看,若吸热板采用选择性涂层或盖板采用高透性低辐射玻璃,该集热器热效率较高,且与建筑一体化程度高,应在住宅建筑中大力推广。
A glazed transpired collector with slit-like perforation was proposed, which improved corrective heat transfer coefficient without influence on collector area, and influencing factors of thermal performance were studied by numerical simulation （Matlab Programming） and experiment. Good agreement of simulation and experimental values was achieved, with average windage of air outlet temperature of 1.1 ℃. Simulation results showed that for collector structure size and physical performance, effect of equivalent diameter of slit-like perforation on thermal efficiency and difference of air inlet and outlet temperature was the largest , followed by absorber outer emittance, cover inner emittance, cover outer emittance, average perforation pitch and collector height in sequence. And for import parameters and environmental conditions, effects of air inlet temperature, environment temperature and outdoor velocity on thermal efficiency and difference of air inlet and outlet temperature were significant. Effect of air flow and solar radiation intensity on difference of air inlet and outlet temperature was large. As a whole, if using absorber with selective coating or high transparent and low emissivity glass, the collectors＇ s thermal efficiency could reach very high. And in view of its better integration with building, it should be promoted on south wall of residential building.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第6期928-936,共9页
Acta Energiae Solaris Sinica
基金
国家"十一五"科技支撑计划(2006BAJ04B01)
天津市应用基础及前沿技术研究计划(09JCZDJC24600)
关键词
盖板式冲缝型集热器
热效率
空气进出口温差
glazed transpired collector with slit-like perforation
thermal efficiency
difference of air inlet and outlet temperature
