Analysis of Dynamic Temperature and Humidity for Civil Aircraft in Hot and Humid Weather with Emergency Air Supply

Based on various compartment heat exchange conditions of civil aircraft, using Matlab/Simulink to calculate the dynamic temperature and humidity. Aircraft needs to descend from cruising altitude to non-pressurized flight altitude for the emergency air supply after losing fresh air from all air conditioning packs. Then the aircraft is required to search nearest airport to land. This typical emergency situation faces the rapid change of altitude and no fresh air supply for compartment before bring in the emergency air. Besides, the emergency air is significantly affected by the external environment especially with the hot and humid weather. The influence of water vapour generated by the human is also considered for compartment temperature and humidity calculation. And the calculation results can be used as the input of human core temperature according to the airworthiness requirement.