Definition of heat transfer
Heat transfer refers to the transfer of energy due to temperature differences, also known as heat transfer. According to the second law of thermodynamics, whenever there is a temperature difference, heat must be transferred from high temperature to low temperature. Therefore, heat transfer is a very common transfer phenomenon in nature and engineering technology. Whether in the energy, aerospace, chemical, power, metallurgy, machinery, construction and other industrial sectors, or in agriculture, environmental protection and other sectors, there are many issues related to heat transfer.