Solar-powered Aircraft Flight Path And Lithium Bromide Absorption Air Conditioning

In this article, a research on how the change of latitude and direction of a solar powered long endurance aircraft effect the received solar power was developed. And on the basis of the car air conditioning, the thermal properties of the single-effect lithium bromide absorption hot-coldwater unit and two-stage lithium bromide absorption hot-coldwater unit applied in car and driven by high temperature cooling fluid of the car engine are advanced and compared. The technique of energetic optimization is employed to investigate the optimal performance of an irreversible hybrid air-conditioning system consisting of a vapor compression refrigerator cascaded with a solar-driver absorption refrigerator. During flight of a solar powered aircraft, latitude and direction are changing at all times, therefore the optimal latitude and the optimal direction at different period is developed.The lithium bromide absorption hot-coldwater units have many merits, such as low consumption of oil, safety in operation, pollution-free and noiseless, and their thermal properties are analysised in this article. On the basis of these results, the optimal operating temperature of the solar collector and the maximum overall coefficient of performance (COP) of the cooling modes of the system are derived.