Data diagram of electric heater

In engineering calculation and selection of electric heater, the data graph of electric heater often involves some common data, such as the heat loss of medium surface, the temperature change of medium under different working conditions, etc In order to prevent unnecessary damage to the medium performance and heating elements while the electric heater is working, some charts are listed below for selection reference 1 Selection of heater power density under forced convection (air, ambient temperature 20 ℃) outlet temperature ℃ Outlet flow rate M / min 2 Heat loss of water surface (ambient temperature 20 ℃) heat loss kW / M 2 Surface temperature ℃ 3 Heat loss of oil or wax surface (ambient temperature 20 ℃) kW / M 2 Surface temperature ℃ 4 Heat loss of molten metal surface (aluminum, Babbitt, tin, ambient temperature 20 ℃) Heat loss kW / M 2 surface temperature ℃ 5 Heat loss of ceramic insulation surface (64kg / m3, environmental temperature 20 ℃ heat loss kW / M 2) Surface temperature ℃ 6 Heat loss of uninsulated steel surface (ambient temperature 20 ℃) kW / M 2 Change curve of ambient temperature and pipe surface temperature under natural convection (￠ 12 pipe diameter) pipe surface temperature ℃ Outlet flow rate M / min