Thermal Resistance Calculator

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Thermal Resistance Calculator:

Enter the values of thickness of the material, X(m), area, A(m2)and thermal conductivity, K(W/m·°C) to determine the value of Thermal resistance, R(°C·m2/W).

Enter Thickness of the Material : m
Enter Area : m2
Enter Thermal Conductivity : W/m.°C
   
Result – Thermal Resistance :

Thermal Resistance :

Thermal resistance describes how strongly a material resists the transfer of heat across its structure.It is a key property in thermal engineering and construction, particularly in insulation and thermal management applications.

Materials with high thermal resistance impede heat transfer, making them suitable for insulating applications.The concept is similar to electrical resistance but applies to heat energy instead of electrical current.

Thermal resistance depends on the thickness of the material, its thermal conductivity, and the area through which the heat is flowing.A thicker material or one with lower thermal conductivity will have a higher thermal resistance.The SI unit of thermal resistance is °C·m²/W (degrees Celsius times meter squared per watt).

In construction, materials with higher R-values offer greater resistance to heat flow, indicating superior insulating effectiveness.It helps determine how effective a material is in preventing heat loss or gain.Thermal resistance is crucial in designing electronics to prevent overheating and component failure.

The property is often used to compare the insulating capabilities of different materials.
It can be calculated for flat layers, cylindrical, and spherical geometries depending on the application.The lower the thermal conductivity, the better the material insulates and the higher the R-value.

Materials like fiberglass, polyurethane foam, and mineral wool have high thermal resistance.Thermal resistance plays a crucial role in assessing the energy efficiency of residential and industrial systems.

Thermal resistance, R(°C·m2/W)in degree Celsius metre square metres per Watts equals the thickness of the material, X(m)in metres, divided by the product of area, A(m2)in square metres, and thermal conductivity, K(W/m·°C) in Watt per metre degree Celsius.

Thermal resistance, R(°C·m2/W)= X(m)/ A(m2)* K(W/m·°C)

R(°C·m2/W)= thermal resistance in degree Celsius square metres per Watts, °C·m2/W.

X(m)= thickness of the material in metres, m.

A(m2)= area in square metres, m2.

K(W/m·°C) = thermal conductivity in Watts per metre degree Celsius, W/m.°C.

Thermal Resistance Calculation:

  1. A wall made of insulation has a thickness of 0.1 m, an area of 10 m2, and a thermal conductivity of 0.04 W/m·°C.

Given: X(m)= 0.1m, A(m2)= 10m2, K(W/m·°C) = 0.04 W/m·°C.

Thermal resistance, R(°C·m2/W)= X(m)/ A(m2)* K(W/m·°C)

R(°C·m2/W)= 0.1 / 10 * 0.04

R(°C·m2/W)= 0.1 / 0.4

R(°C·m2/W)= 0.25°C·m2/W.

  1. A panel has a thermal resistance of 2.5 °C·m2/W, an area of 5 m2, and the thermal conductivity of the material is 0.05 W/m·°C.

Given: R(°C·m2/W)= 2.5°C·m2/W, A(m2)= 5m2, K(W/m·°C) = 0.05 W/m·°C.

Thermal resistance, R(°C·m2/W)= X(m)/ A(m2)* K(W/m·°C)

X(m)= R(°C·m2/W)* A(m2)* K(W/m·°C)

X(m)= 2.5 * 5 * 0.05

X(m)= 0.625m.

 

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