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Why do vending machines have air barriers?
The temperature on both sides of the vending machine enclosure (or the inside and outside sides of the vending machine) is different, and along with the heat transfer, the moisture flow also occurs. This movement of moisture is called water vapor penetration. It is difficult to block the penetration of water vapor. Even harder than blocking heat flow. The temperature difference between the two sides of the envelope will cause the partial pressure difference of water vapor, thus forming the power of water vapor penetration. For example, the outer side (ie the high temperature side) of the vending machine is 30°C, the partial pressure of water vapor is 19.09 mmHg when the relative humidity is 60%, and the low temperature side is 0°C, even if the relative humidity is 100%, the partial pressure of water vapor is Also only has a 4.58mm pump post. In this way, the partial pressure of water vapor on both sides of the envelope is (19.09mmHg-4.58mmHg). 14.51mm Hg, which is quite a boost than a normal fan with a head of 30-60mm H2O - just because of that. The cracks that can press the water vapor through the tiny pores of the enclosure structure enter the vending machine. For low-temperature vending machines, this means that moisture is forced into the enclosure structure and the insulation layer. It has a very adverse effect on the thermal insulation of the vending body. Because the thermal conductivity of ice is 2.0W, which is about 100 times larger than the thermal conductivity of polyurethane, which is 0.02W, and the thermal insulation layer will be damaged in severe cases. Therefore, in order to ensure that the thermal insulation material maintains good thermal insulation performance, prolongs the service life, and maintains the normal use of the vending machine, it is very important to set a moisture-proof and gas-barrier layer on the surface of the thermal insulation layer. It is especially important for air-conditioned vending machines, because in addition to water vapor entering the enclosure, which is not conducive to heat preservation, it will also cause changes in the gas in the vending machine, which is not conducive to the storage of fruits and vegetables. Driven by the partial pressure difference of water vapor, the water vapor outside the vending machine will permeate into the vending machine. When the water vapor penetrates into the air barrier layer of the envelope structure, when the cold air reaches the dew point or freezing point temperature (especially in low-temperature vending machines), the water vapor will condense in the gaps and gaps of the thermal insulation material. Water droplets or ice crystals can dampen the insulation material and reduce the insulation performance.
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