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选取一种新型抛物线型波纹吸热板太阳能空气集热器作为研究对象,建立其数学模型和物理模型,利用ANSYS(有限元分析)14.0数值模拟软件,模拟空气集热器入口空气温度、吸热板涂层、某天不同时刻、波纹布置方式、空气流动方式以及吸热板波纹幅值对空气集热器换热特性及瞬时效率的影响。结果表明:吸热板入口空气顺流流动的温度越低、横向抛物线型波纹板上使用选择性吸收涂层会使得其吸热板平均温度降低,瞬时效率增大,在入口空气流速2.0 m/s时,使用选择性吸收涂层使得瞬时效率最大达68.5%。另外,空气集热器的瞬时效率随时间的推移先增加后减小,在13时时,效率最大达61.8%;吸热板波纹幅值的增加提高了空气集热器的瞬时效率且增幅逐渐减小,在幅值h=10 mm时,效率最大达75.4%。
A new type of parabolic corrugated heat-absorbing panel solar air collector was chosen as research object. Mathematical model and physical model were established. ANSYS (finite element analysis) 14.0 numerical simulation software was used to simulate the air inlet temperature, heat absorption Plate coating, the timing of the day, the corrugation arrangement, the air flow pattern and the corrugation amplitude of the suction plate on the heat transfer characteristics and instantaneous efficiency of the air collector. The results show that the lower the temperature of the inlet air flow downstream of the suction plate, the lower the average temperature of the suction plate on the horizontal parabolic corrugated board is, and the instantaneous efficiency increases. When the inlet air velocity is 2.0 m / s, the use of selective absorption coating allows instantaneous efficiency up to 68.5%. In addition, the instantaneous efficiency of the air collector first increases and then decreases with time, reaching 61.8% at 13 o’clock. The increase of corrugation amplitude of the heat absorption plate increases the instantaneous efficiency of the air collector and decreases gradually Small, up to 75.4% efficiency at h = 10 mm.