太阳能保证率测量的不确定性分析

太阳能保证率是太阳能热水系统的设计参数,也是判断太阳能在一个供热系统中所能发挥的作用的评价指标。近年来,在可再生能源建筑应用工程评价中,把太阳能保证率列为系统的重要评价指标。对影响太阳能保证率测量不确定性的因素进行分析,结果表明:现有的短期测量方法所测得的年保证率具有很大的随意性,并不能真实反映系统性能,检测结果没有实际价值,建议进一步完善检测方法或者取消该项检测。

Uncertainty of Solar Fraction Measurement in a Solar Water Supply System

Solar faction is one of key design parameters and a so a indication to rate the contribution of the solar heat to the hot water demand in a solar water supply system. Recently, solar fraction is re- garded as to be a key indication in the evaluation of renewable energy applications in buildings. In this work, parameters affecting the solar fraction measurement in a solar system were investigated, and re- sults showed that solar fraction measured based on current testing method is of significantly incompat- ible and thus can not be regarded as to an indication to rate the thermal performance of a solar water supply system. This implied that solar fraction measurement based on the current test method is meaningless, and it is necessary to further improve the current test method or cancel such measure- ment.