Thermal insulation is reducing the transfer of hot/cold between two sides of a structure. The thicker the doorblade, the higher the insulating effect it has.
The heat or cold transfer reduces as it experiences more resistance from the insulating materials in the doors. We call this thermal transmittance or heat resistance. These two different terms are rendered as follows.
Heat resistance (Rc):
Rc = Heat resistance (m². K/W)
Heat resistance is a measure for the insulating capacity of a material.
The RC is dependent on:
- the thickness of the material
- the thermal transmittance of the material
The higher this number, the greater the insulation capacity.
Thermal transmittance (Ud):
Ud = thermal transmittance (W/m². K)
Thermal transmittance is a measure for the amount of heat that is able to pass through a door.
The Ud is dependent on:
- the thickness of the material
- the thermal transmittance of the material
- the construction of the doorblade
The lower this number, the less heat is transmitted.