So, what is the heat transfer process? In the PACKAGE BOCK CONDENSING UNIT refrigeration system, the high-temperature and high-pressure refrigerant vapor entering the condenser is condensed into liquid by the air or cooling water in the surrounding environment; the low-temperature refrigerant liquid entering the evaporator is removed from the surrounding air or the refrigerant. It absorbs heat and vaporizes, so that the temperature of a certain area drops, and the purpose of refrigeration is achieved. The process of transferring heat between the refrigerant and the surrounding fluid through the tube wall is called the heat transfer process.
According to the form of the solid wall, there are mainly three heat transfer processes in the commonly used PACKAGE BOCK CONDENSING UNIT, namely, the heat transfer process through the flat wall, the heat transfer process through the round tube, and the heat transfer process through the wall.
1. Flat-wall heat transfer: When the heat transfer wall is a flat plate, or it may be similar to a flat wall, the heat is transferred from the high-temperature liquid on one side to the low-temperature fluid on the other side through the wall, forming a flat wall. heat transfer.
2. Round tube heat transfer: In the condenser and evaporator of the PACKAGE BOCK CONDENSING UNIT refrigeration system, many copper and steel heat transfer tubes are used, so the heat transfer through the round tube is very common.
3. Heat transfer of the wall: It can be seen from the heat transfer equation of PACKAGE BOCK CONDENSING UNIT that the heat transfer per unit time not only increases with the increase of the heat transfer coefficient, but also increases with the increase of the heat transfer surface . When the heat transfer coefficient increases to a certain level and it is difficult to increase, the heat transfer can be increased by increasing the heat transfer denomination, usually by processing fins or fins on the heat exchange wall.