【摘要】 本文采用单热容动力模型,对真空管集热器瞬时效率与全日效率、单个集热器全日效率与串联组合集热器全日效率之间的关系作了探讨。 串联组合集热器的全日效率可以通过单个集热器的全日效率经计算求取。更多还原

【Abstract】 The all-day performance of the evacuated-tube collectors is investigated. The relationship between the instantaneous and daily performance is verified theoretically and experimentally. The results show:(1) The slope of the daily efficiency, if described by the mean parameter (Ti-Ta)/ I, is equal to the slope of the instantaneous efficiency.(2) If (mC)ΔT0/ID<0.02, the differences between the predicted daily efficiencies and the actual daily efficiencies are within the acceptable tolerance.The calculation method of the daily performance of the collectors in series from that of a single collector performance is also presented. The calculated results of the daily efficiencies are in good agreement with the experimental results.更多还原