Warm Up – clear and simple explanation of technical terms
Each subject area has its own terminology, technical terms and linguistic concepts. What one person considers a screw-in heater can be an immersion heater to another, or even simply a heater. You will learn what this means for the field of electric heat and why, for example, surface load is one of the most important issues and what effect it has on your heating process and the life of the heater.
Beschreibung der Fachbegriffe
Electric screw-in heater
Electric tubular heater
Electric tankless water heater
It should be noted that the unheated length of the tubular heater must be subtracted from the height h.
The maximum permissible surface load differs for each medium; the medium can only absorb limited thermal energy depending on its own heat capacity. The following limits (max. guide values) should not be exceeded:
Air: 4 W/cm²
Water: 10 W/cm²
Oils: 2 W/cm²
Joule’s first law
If an alternating current or alternating voltage is present, then the cosine of the phase angle ϕ must also be included in the product when calculating active electric power. Pact = U x I x cos ϕ.
liquid and gaseous media under the influence of the temperature difference. Energy is transferred in the molecular bond by vibrations; there is a physical contact. Heat is transported in the direction of decreasing temperature. The greater the temperature difference as well as the thermal conductivity of the medium, the stronger the heat. This also influences the speed of heat conduction.