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机械保温车车外空气总是含有一定数量的水蒸汽。众所周知,水蒸汽的分压力等于空气的绝对压力乘以水蒸汽的相对容积含量。如果空气温度高于相应分压力的饱和温度,那么水蒸汽则过热;由空气和过热水蒸汽所组成的混和物称为未饱和的湿空气。如果空气温度等于水蒸汽的饱和温度,那么水蒸汽就饱和了,这种空气称为饱和的湿空气。当未饱和的湿空气冷却到所谓露点温度时,空气中的水蒸汽就饱和了,再进一步冷却,水蒸汽则凝聚出来。空气是在机保车内冷却和保持易腐货物在运输过程中达到预定温度条件的基础,因
Mechanical insulation car outside the air always contains a certain amount of water vapor. As we all know, the partial pressure of water vapor is equal to the absolute pressure of air times the relative volume content of water vapor. If the air temperature is above the saturation temperature of the corresponding partial pressure, then the water vapor is overheated; the mixture of air and superheated steam is called unsaturated, humid air. If the air temperature is equal to the saturation temperature of water vapor, then the water vapor is saturated, this air is called saturated wet air. When the unsaturated wet air cooled to the so-called dew point temperature, the water vapor in the air is saturated, and then further cooling, the water vapor is condensed out. Air is the basis for cooling and maintaining perishable goods in the machine-carrier due to the pre-determined temperature conditions during transport