基于ASHRAE模型的客舱表面太阳辐射量分析

Analysis of solar radiation on the surface of cabin based on ASHRAE model

为解决飞机在航前、航后及经停阶段,桥载空调过度使用导致其寿命缩短并浪费能源问题,采用ASHRAE太阳辐射模型,并按照中国实际情况对太阳常数进行了修改,对影响飞机客舱能耗的太阳辐射进行分析.分析结果表明客舱右上、右下、左上、左下等四个曲面受到的太阳直射辐射、地面反射辐射、天空散射辐射随着太阳高度角和方向按一定规律进行变化,由于各曲面朝向不同,变化规律也不同.太阳总辐射量中太阳直射所占比例较大,右上曲面和左上曲面的太阳直射辐射分别在10时和14时达到峰值。掌握客舱能耗变化的规律,对于合理控制桥载空调的运行有指导意义,便于引入预测控制,避免桥载空调过度使用,延长其使用寿命,同时节约电能.

In the phase ofpre-flight, post-fight and stopovers, air-conditionings under corridor bridges are always overused, leading to air-conditionings short working life and energy waste. To solve this problem, solar radiation, which affects the energy consumption of aircraft cabin, was analyzed by using ASHRAE model, where the solar constant is calibrated according to China actual condition. The analysis results show that the direct solar radiation, ground refection and scattered radiation, which are received by the cabin upper-right, lower-right, upper-left and lower-left surface, vary regularly with the sun angle and direction. Since the orientation of each surface is different, the pattern of solar radiation is different. The direct solar radiation is the main part in total solar radiation. The received direct solar radiation on the right-upper surface and the upper-left surface reaches peak at 10 and 14 o＇clock respectively. The pattern of cabin energy varying with solar radiation can be used to arrange air-conditionings control in a reasonable way. It is convenient for introducing the predictive control to avoid over-use of air conditionings, thus the service life will be prolonged. At the same time, the consumption of electricity is reduced.