- Current load for low voltage applications
For low voltage applications, the currents are much higher than for household applications (230 V) due to Ohm’s law. Therefore, it is important to ensure a sufficiently large wire cross-section.
- Power strongly dependent on PTC temperature
The power of a heater is dependent on two factors: the temperature difference dT and the heat dissipating surface A. The formula P = α * A + (dT) described this relationship, where α stands for the heat transfer coefficient. For an air heater, dT would be the temperature difference between the air and the surface of the heater.
Higher temperatures (dT) allow for higher power outputs. For most applications, however, we recommend a temperature between 180 °C and 240 °C .
Increasing the heat dissipating surface area can also increase performance.