The thermal load of the airplane refers to the net heat transmitted in (or out) per unit time when keeping the constant temperature and humidity in the cabin of the airplane, which is the reference to estimate the ability of the temperature conditioning system. On the basis of consulting 25 kinds of foreign related literature on airplane environmental control system, two kinds of thermal load estimation method were proposed as follows.The thermal load of airplane passenger cabin had a good linear relationship with the number of passenger, under determining the number of cabin crew, using estimation model 1 could estimate crew cabin heat loads. The value range of the heat transfer coefficient of the aircraft whole cabin wall was 2.45 ~ 7.97 W/(m2·��) and the average value was 4.93 W/(m2·��). In the preliminary design of environmental control system, if the concept of shape is known, using estimation model 2 could also estimate cabin crew thermal load easily. The research results will offer some guidance for the development on civil airplane.
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