Property
Thermal transmittance (U-value) v1.0
Active
URL: https://opendictionary-ecstest.test-bim.com/organization/25869347-9422-4528-ac1c-65954fa4061d/dictionary/9287e0cf-0039-4370-9a67-daf4043be075/property/90bab10f-2d8d-4102-b532-de90b918ebbf
GUID: ee31f8f3-b42a-48c8-aef2-43ebf1eeed26
Definition
The total quantified rate of heat transfer through a complex, multi-layered architectural assembly, integrating conduction, convection, and radiation losses.
Description
The ultimate performance metric governing the overall energy efficiency of modern curtain walls, insulated roofing systems, and exterior doors.
Example
45
Technical definition
Data type
Float
Unit
Square Metre Kelvin Per Watt (m²·K/W)
Quantity Kind
Thermal Insulance
Usage
Property groups (1)
References
Reference documents (7)
- ASTM C518 Steady-State Thermal Transmission Heat Flow Meter Method v1.0
- EN 12667 Thermal transmittance (U-value) Thick Products v1.0
- EN 13501-1 Reaction to fire classification of Construction Products v1.0
- EN 13501-2 Fire Resistance of Building Elements v1.0
- EN ISO 10077-1 Thermal Performance Part 1 v1.0
- EN ISO 10292 Thermal Performance Calculation of U value v1.0
- EN ISO 6946 Building Components Thermal transmittance (U-value) v1.0