求翻译：这样较少的供气量就能满足相同的制冷效果，发动机油耗少，经济性好。但在飞机静止在地面或低速运动时，热交换器周围缺乏冲压空气，就会使热交换器外围空气的温度升高，从而缩小温度差导致热交换律降低，影响制冷效果，因此在M D 8 2 及MD90 飞机空调系统中增加了一条与冲压空气管道风扇通道并列通向热交换器的风扇通道是什么意思？

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This is a relatively small number of gas supply volume will be able to meet the same effect of refrigeration, the engine oil consumption and economic good. But geostationary on the ground or in the aircraft at low speed movement around, heat exchangers, air, and then it will be punched lack heat exc

Like this few can satisfy the same refrigeration effect for the spirit, the engine oil consumption are few, the efficiency is good.But in airplane static when ground or low speed movement, around the heat interchanger lacks the ramming air, can cause the heat interchanger periphery air the temperatu

So less amount of steam supply can meet the same performance, engine oil consumption few and economic good. But in the plane standing still in the ground or in low speed movement, lack of RAM air around the heat exchanger, makes the heat exchanger external air temperature increases, thus reducing th

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