What is the working principle of the paving machine screed plate heating device?

The working principle of the paving machine screed plate heating device is mainly to convert energy into heat energy and transfer the heat energy to the screed plate to make it reach a suitable working temperature.
For the gas heating device, the principle is to use gas (such as propane, natural gas) to burn in the combustion chamber to generate high-temperature flames and hot air flows. The chemical energy in the combustion process is converted into heat energy, which is in contact with the screed plate through the heat exchanger and conducts the heat to the screed plate.
The working principle of the electric heating device is based on Joule's law that heat is generated when current passes through a resistor. In the electric heating device, after the resistance wire or other resistance element is energized, the electrical energy is converted into heat energy. This heat is transferred to the screed plate by heat conduction to increase its temperature.
Whether it is gas heating or electric heating, the purpose is to make the screed plate reach a certain temperature so that the pavement material can be effectively ironed, compacted and preliminarily solidified during the paving operation to ensure the flatness and quality of the paved road surface.