Heat transfer is a physical process in which heat flows from one body to another. When a hot body is brought in contact with the cold, heat starts to flow from hot body to cold and the process of heat transfer continue until both the bodies come to same temperature. The process of heat transfer takes place due to the transfer of kinetic energy of the particles when they collide with each other. The amount of heat transfer depends on the heat conductivity. Heat transfer takes place more in metals as compared to non metals as metals are good conductor of heat.

The heat transfer process can also take place through radiation. The heat transfer takes place in this process without any need of substance. Convection is another form of heat transfer which takes place in liquids and gases. The process of Radiation takes place mainly due to heat transfer. Use of pumps can make the process of heat transfer more effective. Pumps help to bring heat from lower temperature and transfer it to a medium with higher temperature. Heat pump works more effectively if the temperature difference between the objects is smaller.

Heat exchanger is another device used for the heat transfer. There are many types of heat exchanger available which can cause heat transfer effectively. Heat transfer is a very useful process which helps the cold body to attain certain temperature. This process is used in various applications and helps us in our daily life very much. We should be careful in using pumps for the heat transfer because these pumps can absorb more heat energy from surroundings. Due to this absorption, there is more cooling in the environment and it lowers the temperature in the surroundings. The principle of heat transfer is very beneficial in our daily life and it can help us in various ways.