How to keep the vending machine warm?

How to keep the vending machine warm? Due to the difference in temperature on both sides of the vending machine housing, as the heat transfers, humid air flow will also appear. This movement of water is called water vapor penetration. It is difficult to prevent the penetration of water vapor. It is even harder than stopping the heat flow. The temperature difference on both sides of the enclosure will cause the partial pressure difference of water vapor, thus forming the power of water vapor penetration. For example, when the exterior of the vending machine is 30°C and the relative humidity is 60%, the partial pressure of water vapor is 19.09 mmHg, and the low temperature side is 0°C. Even if the relative humidity is 100%, the partial pressure of water vapor is only 4.58 mm pump column. In this way, the partial pressure of water vapor on both sides of the housing is (19.09 mm Hg-4.58 mm Hg) 14.51 mm Hg, which is a considerable driving force compared with an ordinary fan with a pressure head of 30-60 mm H2O ——Because of this driving force. Water vapor can be forced into the vending machine through the gaps of the tiny pores in the shell structure. For low temperature vending machines, humid air pressure is put into the shell structure and insulation layer. This has an extremely adverse effect on the insulation of the vending machine body. Because the thermal conductivity of ice is 2.0W, which is 100 times larger than the thermal conductivity of polyurethane of 0.02W, it will damage the thermal insulation layer in severe cases. Therefore, in order to ensure that the insulation material maintains good insulation performance, prolongs the service life, and maintains the normal use of the vending machine, it is very important to provide a moisture-proof and airtight layer on the surface of the insulation layer. Especially for temperature-controlled vending machines, this is particularly important, because in addition to water vapor entering the shell structure 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 penetrate into the vending machine. When water vapor penetrates into the gas barrier of the enclosure structure, when the cold air reaches the dew point or freezing point temperature, the water vapor will condense into water droplets or ice crystals in the gaps and crevices of the insulation material, which will make the insulation material damp and reduce Thermal insulation performance. Previous: How to join the unmanned vending machine market in Guangdong vending machine Next: A few tips for the location of beverage vending machines