Calculate Overall Heat Transfer Coefficient ‘U’
The overall heat transfer coefficient ‘U’ is a crucial parameter in heat transfer calculations. It represents the total thermal resistance of a system and is used to determine the heat loss or gain through a surface.
How to Use This Calculator
- Enter the area of the surface in square meters.
- Enter the inside and outside temperatures in degrees Celsius.
- Enter the total thermal resistance of the system in (m²•K)/W.
- Click the ‘Calculate’ button to find the overall heat transfer coefficient ‘U’.
Formula & Methodology
The overall heat transfer coefficient ‘U’ is calculated using the formula:
U = 1 / (Rtotal)
where Rtotal is the total thermal resistance of the system, which is the sum of the individual resistances of all components.
Real-World Examples
Data & Statistics
| Material | U-value (W/m²K) |
|---|---|
| Brick | 0.8 |
| Concrete | 1.0 |
| Wood | 0.6 |
| Temperature Difference (°C) | U-value (W/m²K) |
|---|---|
| 10 | 2.5 |
| 20 | 3.0 |
| 30 | 3.5 |
Expert Tips
- Always use the correct units for input values.
- Consider the effect of temperature difference on the U-value.
- Use the results to optimize your heating and cooling systems.
Interactive FAQ
What is the unit of the overall heat transfer coefficient ‘U’?
The unit of ‘U’ is W/m²K.
How does temperature difference affect the U-value?
Temperature difference can affect the U-value due to changes in heat transfer mechanisms and material properties.
Energy Performance Standards for Building Envelope – U.S. Department of Energy
Thermal Conductivity Data – Engineering ToolBox