Analysis of a hermetic cabin of a passenger aircraft as a temperature controlled object

In the case of ground–based air conditioning, at the time of pre–flight preparation of a passenger aircraft, comfortable conditions for passengers to stay in its cabin should be created, in particular, in terms of air temperature. Preflight preparation is limited in time, therefore, an actual task is to estimate the time to reach the required air temperature and the effect of the design characteristics of the hermetic cabin on the parameters of the environmental control system during non-stationary cooling or heating of the hermetic cabin. The paper considers the hermetic cabin of a passenger aircraft as an object of regulation for the thermal control subsystem of the air entering the cabin. A system of differential equations of a hermetic cabin and its solution are presented. The processes of non–stationary cooling of a hermetic cabin are investigated by evaluating the effect of its geometric parameters and thermal inertia on temperature changes in the passenger cabin. The transfer function of the hermetic cabin is found, and its reaction to stepwise and harmonic effects is investigated.
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