全玻璃真空管太阳能空气集热器热性能试验方法研究

STUDY ON MEASUREMENT OF THERMAL PERFORMANCE OF ALL-GLASS EVACUATED TUBULAR SOLAR AIR HEATER

全玻璃真空管空气集热器是一种热损较小的太阳能空气加热装置。该文对该类集热器热性能评价方法进行了研究 ,并对集热器的时间常数、热延迟常数、角系数修正因子及瞬时热效率的实验方法进行了初步的实验研究。研究表明 ,用热延迟常数比时间常数能更好地反映真空管集热器的热性能 ,真空管集热器的角系数修正因子在垂直入射时最小。

Evacuated tubular solar collector is good for solar air heater due to its low heat loss. A study on the thermal performance of the solar air heater was presented. The methods to test the time constant, resident time, incident angular modifier and instantaneous thermal efficiency were suggested. The resident time would be better than the time constant to represent the thermal properties of solar air heater. The incident angular modifier would be minimal at noon for the evacuated tubular solar air heater.