Heat transfer
Heat transfer (heat transfer), or heat transfer, is the heat from the high temperature to low temperature part of the transfer process, heat transfer in three ways: ▪ heat transfer: the heat from the high temperature to low temperature part of the transfer process is a molecule to another The result of a molecule that transmits vibrational energy. Various materials of different thermal conductivity, good conductivity, such as metal, also includes the movement of free electrons, so the heat transfer speed, you can do heat exchanger materials; conduction performance is not good, such as asbestos, can do thermal insulation material. ▪ Thermal convection: refers to the heat transfer process caused by the relative displacement between the various parts of the fluid due to the macroscopic movement of the fluid and the mixing of the hot and cold fluids. Different temperatures cause the density difference of the system to cause convection. Convection conduction is involved in the dynamic process, so it is faster than direct conduction. ▪ Thermal radiation: heat is radiated directly through electromagnetic radiation. The conduction velocity depends on the absolute temperature of the heat source. The higher the temperature, the stronger the radiation. According to the heat transfer method and process requirements, the design of heat exchangers, almost all kinds of chemical industry has a heat exchange process, the need for a variety of heat exchangers. ...