U-Values
Definition
A U-Value is a measure of air-to-air heat transmission (loss or gain) due to thermal conductance and the difference in indoor and outdoor temperatures. As the U-Value decreases, so does the amount of heat transferred through the material. The lower the U-Value, the better.
To satisfy clients needs for greater sustainability and thermal efficiency, a u-value calculator has been made available, providing specific thermal performance relating to the Jedson range of composite door styles and sizes.
Breakdown of Calculation
The composite door u-value calculator opposite is based on known u-values given by the individual part manufacturers. The tables below show the u-values of the relevant parts of the door, and the area of the glass for each style. The area of the glass is fixed regardless of overall door size.
| Component | U-Value |
|---|---|
| Door Outer Solid door blade Standard Double glazed unit Double glazed unit with Warm Edge spacerbar Double glazed unit with Warm Edge, Softcoat and Argon Filled |
1.60 w/m²K 0.85 w/m²K 1.80 w/m²K 1.50 w/m²K 1.30 w/m²K |
| Door Style | Area of DGU |
|---|---|
|
Bordesley, Cleve, Margam Bourn Cartmel Boxgrove Two Boxgrove Four Glastonbury, Ewenny Glastonbury Three, Ewenny Three Pershore Old Pershore Balmerino, Old Balmerino |
0.37m² 0.51m² 0.48m² 0.06m² 0.30m² 0.11m² 0.35m² 0.05m² 0.08m² 0.22m² |