Get heat loss calculation and comparison sheet to find and select most suitable insulation materials for your use. Heat Insulation made of Fire Resistant Insulation Inorganic Mineral Fibers at Wedge India for walls, roofs, tank, foundations, floors cold and hot insulation.
 
To calculate heat loss through a material or building element, we use the heat transfer equation based on conduction. The amount of heat lost depends on several factors, including the U-value of the material, the surface area, the temperature difference between inside and outside, and the time over which the heat loss occurs.
 
Steps to Calculate Heat Loss
1. Determine the U-value
• The U-value measures the thermal performance of the material or structure. You may already have this value, or you can calculate it by taking the inverse of the R-value of the insulation.
2. Measure the surface area
• Find the total surface area (A) of the building element where heat loss occurs. This could be the area of a wall, roof, or window.
3. Identify the temperature difference (ΔT)
• This is the difference between the inside temperature and the outside temperature.
4. Calculate the heat loss (Q)
• Multiply the U-value by the surface area and the temperature difference.
 
Heat Loss Over Time
To calculate the heat loss over time (in hours), simply multiply by the number of hours
 
Key Considerations
The lower the U-value, the lower the heat loss, as the material has better insulation properties.
Heat loss also depends on factors like air infiltration and radiation through windows, which may require additional calculations.
 
Insulation Material
Heat Loss (Watts) at ΔT = 20°C and A = 1 m²
WedGel Aerogel
1.75
Wedge FSMP Microporous
1.78
Closed-Cell Spray Polyurethane Foam (SPF)
3.08
Polyisocyanurate (PIR)
3.33
Extruded Polystyrene (XPS)
4.00
Expanded Polystyrene (EPS)
5.00
Wood Fiber
5.26
Mineral Wool
5.41
Open-Cell Spray Polyurethane Foam (SPF)
5.41
Cork
5.56
Cellulose
5.71
Cotton (Denim)
5.71
Sheep’s Wool
5.71
Fiberglass
6.25
Calcium Silicate
6.67
Vermiculite and Perlite
8.00
Straw Bale
13.79
 
Would you like to calculate the heat loss for a specific structure or material? You can provide the U-value, surface area, and temperature difference, and we can assist with the calculation!