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Why set up an air barrier for beverage vending machines?
Why set up an air barrier for the beverage vending machine? Due to the different temperatures on both sides of the enclosure structure of the beverage vending machine, or in other words, the inside and outside of the beverage vending machine, along with the transfer of heat, moisture air movement also occurs. This movement of moisture is called water vapor permeation. It is difficult to block the penetration of water vapor. Even more difficult than blocking heat flow. The temperature difference on both sides of the enclosure structure will cause the partial pressure difference of water vapor, thus forming the power of water vapor penetration. For example, the outer side of the beverage vending machine, that is, the high temperature side is 30°C, and the water vapor partial pressure is 19.09 mm Hg when the relative humidity is 60%, and the low temperature side is 0°C. Even when the relative humidity is high, the water vapor partial pressure is only 4.58mm pump column. In this way, the water vapor partial pressure on both sides of the enclosure structure is 19.09mmHg-4.58mmHg. 14.51mm Hg, which is a considerable boost over a normal blower with a pressure head of 30-60mm H2O - just because of that push. It can press the water vapor into the beverage vending machine through the cracks of the tiny pores of the enclosure structure. For the low-temperature beverage vending machine, it means that the moisture pressure is entered into the enclosure structure and the insulation layer, and the insulation belt of the beverage vending machine body have extremely adverse effects. It is especially important for modified atmosphere beverage vending machines, because in addition to water vapor entering the enclosure structure, which is not conducive to heat preservation, it will also cause changes in the gas in the beverage vending machine, which is not conducive to the storage of beverages. Driven by the water vapor partial pressure difference, the water vapor outside the beverage vending machine will penetrate into the beverage vending machine. When water vapor penetrates into the air barrier of the enclosure structure, when the cold air reaches the dew point or freezing point temperature (especially in low-temperature unmanned vending machines), water vapor will condense in the gaps and gaps of the heat insulation material. Form water droplets or ice crystals, make the insulation material damp and reduce the insulation performance. Because the thermal conductivity of ice is 2.0W/(M?K), which is about 100 times larger than that of polyurethane, which is 0.02W/(M?K), and it will damage the heat insulation layer in severe cases. Therefore, in order to ensure that the heat insulation material maintains good heat insulation performance, prolong the service life, and maintain the normal use of the beverage vending machine, it is very important to install a moisture-proof and air barrier layer on the surface of the heat insulation layer.
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