In the working process of the surface cooler, the refrigerant is mainly used to absorb heat in the surface cooler, so that the temperature of the cooled space is gradually reduced. The fan coil surface cooler of the air handling unit cools the air flowing through the heat exchange fins outside the pipe through the air conditioning chilled water (refrigerant water) flowing inside. The fan sends the cooled cold air to the place of use for cooling. The refrigerant water takes the heat absorbed back to the refrigeration unit from the return pipe of the surface cooler, releases heat, cools down, and then is sent back to the surface cooler to absorb heat and cool the air flowing through And it goes on and on.
The surface cooler can effectively avoid the oxidation of heat transfer oil to a certain extent. As the heat carrier, the heat transfer oil is prone to oxidation reaction under high temperature operation, resulting in oil deterioration. Therefore, nitrogen charging protection should be carried out in the high temperature expansion tank to ensure the sealing of the system, avoid contact with air and prolong the service life of hot oil.
When the oil temperature of the heat conducting oil exceeds the allowable temperature, the coking phenomenon will appear on the oil pipe wall of the surface cooler. Once the coking layer is generated, the heat displacement will be affected, resulting in the high wall temperature of the oil pipe, the coking situation will worsen, and the explosion accident may occur.
The surface cooler should strictly control the temperature of heat transfer oil, which should not exceed the higher service temperature, and the higher film temperature of heat carrier should be less than the allowable film temperature. The refrigerant is used to absorb heat in the surface cooler, so that the temperature of the cooled space is gradually reduced. The fan coil surface cooler of the air handling unit cools the air flowing through the heat exchange fins outside the pipe through the air conditioning chilled water (refrigerant water) flowing inside. The fan sends the cooled cold air to the place of use for cooling. The refrigerant water takes the heat absorbed back to the refrigeration unit from the return pipe of the surface cooler, releases heat, cools down, and then is sent back to the surface cooler to absorb heat and cool the air flowing through And it goes on and on.
Avoid coking of heat transfer oil; when the oil temperature of heat transfer oil exceeds the high allowable temperature, coking will appear on the oil pipe wall. Once the coking layer is generated, the heat displacement will be affected, resulting in the high wall temperature of oil pipe, the coking situation will worsen, and the explosion accident may occur. Therefore, the temperature of heat transfer oil should be strictly controlled, and the high film temperature of heat carrier should be less than the allowable film temperature.