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Why do some unmanned vending machines have an air barrier?
Why is an unmanned vending machine equipped with an air barrier Because the temperature on both sides of the unmanned vending machine enclosure structure (or the inside and outside of the unmanned vending machine) is different, along with the transfer of heat, the movement of moist air flow occurs. This movement of moisture is called water vapor penetration. It is difficult to block the penetration of water vapor. It is even more difficult than blocking the heat flow. The temperature difference between the two sides of the enclosure will cause the partial pressure difference of water vapor, thus forming the power of water vapor penetration. For example, the outside (high temperature side) of the unmanned vending machine is 30°C, the partial pressure of water vapor at a relative humidity of 60% is 19.09mm Hg, and the low temperature side is at 0°C, even when the relative humidity is 100%, the water vapor The pressure is only 4.58mm pump column. In this way, the partial pressure of water vapor on both sides of the enclosure structure is (19.09mm Hg-4.58mm Hg). 14.51mm mercury column, which is a considerable driving force than an ordinary fan with a pressure head of 30-60mm water column-just because of this driving force. The water vapor can be forced through the cracks of the tiny pores of the enclosure structure into the unmanned vending machine. For low-temperature unmanned vending machines, this means that the wet air pressure enters the enclosure structure and the insulation layer. It has extremely adverse effects on the insulation of the unmanned vending machine body. is especially important for air-conditioned unmanned vending machines, because in addition to water vapor entering the enclosure structure is not conducive to heat preservation, it will also cause changes in the gas in the unmanned 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 unmanned vending machine will penetrate into the unmanned 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 (especially in low-temperature unmanned vending machines), the water vapor will condense in the voids and gaps of the insulation material. Water droplets or ice crystals will make the insulation material damp and reduce the insulation performance. Because the thermal conductivity of ice is 2.0W/(M?K), it is about 100 times larger than the thermal conductivity of polyurethane of 0.02W/(M?K). In severe cases, it will damage the thermal insulation layer. Therefore, in order to ensure that the thermal insulation material maintains good thermal insulation performance, prolongs its service life, and maintains the normal use of the unmanned vending machine, it is very important to provide a moisture-proof and gas-barrier layer on the surface of the thermal insulation layer. 丰 Vending Machine-China's large-scale unmanned vending machine manufacturer, provides a cost-effective, full range of vending machines, to meet customer personalized customization needs, and create a brand new vending machine product. The adult product vending machine is on sale for 9,999 yuan.
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