太阳能集热器热性能动态测试方法研究

STUDIES ON TEST METHODS FOR THE THERMAL PERFORMANCE OF SOLAR COLLECTORS UNDER QUASI-DYNAMIC CONDITIONS

对太阳能集热器热性能动态测试方法进行了介绍,并对该方法的数学模型进行了分析;探讨了各项参数在方程中的作用、可以忽略的条件等;分析了稳态测试方法严格规定试验条件的必要性及原因,并对方程的数值求解进行了分析与推导。对同一台太阳能集热器分别进行动态和稳态测试方法的试验数据进行了不确定度分析,对试验结果进行了分析和对比,并分析了太阳能集热器效率曲线截距的差异以及在不同归一化温差处集热器瞬时效率曲线差异的深层次原因。

The test method for the thermal performance of solar collectors under quasi-dynamic conditions was introduced analyzing the mathematics model, and inquiring into each item in equation and being negligible condition, etc. The steady test request necessity was stated and the test results from the uncertainty of the data was compared. The same solar collectors through steady state and quasi-dynamic methods were analyzed respectively. The difference of the intercept of the solar collector＇s efficiency curve and the deep reason of the difference of the efficiency curve at the different reduced temperature difference was analyzed as well.