Energy conversion efficiency of heating elements

Electric heating tubes already have a very high electric-heat conversion efficiency, which can generally reach more than 93%, but if energy efficiency is used to describe the ratio of effective heat movement to energy required for work, the energy efficiency of electric heating tubes is far inferior to other energy conversion equipment, such as modern The popular air source heat pump usually provides energy efficiency of 3-4 times, and the limit of electric heating tube is 1 time. This is because according to the Joule effect Q = I2Rt, the heat energy directly converted into electric energy can only be infinitely close to the input electric energy. Therefore, under such circumstances, we pay more attention to the thermal energy utilization rate of electric heating tubes.