太阳能热风采暖系统热性能的影响因素研究

INFLUENCING FACTOR STUDY ON THERMAL PERFORMANCE OF SOLAR AIR HEATING SYSTEM

提出一种新型的真空玻璃盖板式冲缝型集热器，对由该集热器和蓄热器构成的太阳能热风采暖系统的热性能进行研究。利用热平衡法和频域回归方法，建立太阳能热风采暖系统和建筑的传热数学模型，并经过实验验证，进而以1月份平均太阳能保证率为目标函数，模拟研究集热器和蓄热器的结构参数、物性参数对系统热性能的影响。结果表明，1月份平均太阳能保证率随吸热板发射率和冲缝当量直径的增大而减小；随平均冲缝间距的增大先减小后增大，适宜的平均冲缝间距取值范围为P≥0．08m；随集热器面积和蓄热器体积的增大而增大，但太阳能保证率随蓄热器体积增大而增长的速率迅速降低，适宜的蓄热器体积与集热器面积之比应为0．15～0．26m^3／m^2。

Abstract： The paper proposed a new transpired collector with vacuum glass-cover board and slit-like perforation, and then studied the thermal performance of solar air heating system consisted of the new collector and regenerator. Using heat balance method and frequency domain regression method, the paper built heat-transfer mathematical model of system and building. The model was verified by experiment to show its correctness. Then the paper took average solar fraction of January as target function to study the effect of collector and regenerator parameters on system performance. Simulated results showed that average solar fraction of January decreased with absorber outer emittance and perforation equivalent diameter. It firstly decreased then increased with average perforation pitch, so suitable pitch values range was P≥0. 08 m. It increased with collector area and regenerator volume. However, its increasing rate with regenerator volume would decrease rapidly, so suitable ratio of regenerator volume to collector area was 0. 15-0.26 m3/m2.