Thermal Resistance Calculator

Our thermal resistance calculator is the place to just go if you need to calculate the thermal resistance of a plate, hollow cylinder, or hollow sphere quickly. Simply, give the inputs in the input field and click on the calculate button, that provides you the result.

Thermal Resistance Calculator: Our tool will calculate the thermal resistance value when you select the shape of your object and enter geometric and material data. This tool can be used to convert thermal conductivity to thermal resistance for a particular geometry.

Would you like to learn more about the interesting concepts and calculations that go into making our calculator work? Please continue reading to understand more about thermal resistance and the formula for calculating it.

What is the Definition of Thermal Resistance?

The rate of change in temperature of a material per unit of energy delivered is measured by thermal resistance. To put it another way, heat energy flow resistance.

The formula for Thermal Resistance 

Thermal resistance is calculated using the formula below.

R = X / A*K


R = absolute thermal resistance (K/W)

X = thickness of the material parallel to heat flow (m)

A = cross-sectional perpendicular to heat flow (m^2)

K = thermal conductivity of the material (W/(K*m))

How Do I Use the Thermal Resistance Calculator?

The following points will show you how to use our calculator to determine an object's thermal resistance:

  1. First, choose your object's shape from the drop-down option. A plate, a hollow cylinder, and a hollow sphere are the three shapes of our calculator.
  2. You can select an available material from the drop-down menu after selecting the shape of your object; the "Conductance (k)" field will be automatically filled. If you can't find the material you need, simply type the thermal conductance value into the "Conductance (k)" field.
  3. Our calculator will show you various geometrical alternatives based on the shape of the selected object:

A plate

To begin, determine the thickness of your plate.

Now input the cross-sectional area of the plate (A). At the bottom of the calculator, you will find the advanced mode where you can insert explicit values for length and width.

A hollow cylinder

Enter the inner and outer radii, then the length of the hollow cylinder.

A hollow sphere

A hollow sphere Enter the hollow sphere's inner and outer radii.

  1. You may calculate the thermal resistance of your object by entering the above parameters.

You can also determine the critical radius of insulation for hollow cylinders and spheres using the following guidelines:

To calculate the critical radius of insulation for your hollow item, enter the convective heat transfer coefficient value in the "Heat transfer coefficient (k)" box and the thermal conductance value in the "Conductance (k)" box.

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FAQs on Thermal Resistance Calculator

1. How is thermal resistance calculated?

Kelvins per watts (K/W) is the unit for thermal resistance. The temperature difference T2 - T1 and the heat flow Q1-2 between two places are defined as the thermal resistance R. R = (T2 - T1) / Q is the equation for thermal resistance.

2. What is the definition of thermal resistance?

The ratio of the temperature difference between two sides of a material to the rate of heat flow per unit area is known as thermal resistance.

3. What is the difference between R-value and K-value?

Insulation performance can be quantified in terms of "R-value" and "K value," but the two values mean two distinct things. K-values indicate how much heat goes through a material, whereas R-values indicate how well heat passes through the material.