First, the Upright Freezer evaporator has more air or refrigerated oil, and the heat transfer effect is reduced. More refrigerant oil is attached to the heat transfer tube of Upright Freezer evaporator, and the heat transfer coefficient is greatly reduced. Similarly, if there is more air in the electric heating pipe, the heat transfer area of the refrigerated cabinet evaporator will be reduced, the heat transfer efficiency will be significantly reduced, and the temperature reduction rate will also slow down.
Second, the frost or dust of the Upright Freezer evaporator is too thick, and the heat transfer effect is reduced. Another main reason for the slow temperature drop of the Upright Freezer is the low heat transfer efficiency of the evaporator. This is mainly because the frost layer on the outside of the Upright Freezer evaporator is too thick or too dusty. Because the external temperature of the evaporator is mostly lower than 0 degrees Celsius, the humidity of the Upright Freezer is relatively high, and the moisture in the air is sandwiched with cream or frozen outside the evaporator, which affects the heat transfer effect of the Upright Freezer evaporator.
