Condensation Resistance Factor Calculator

Reviewed By: Patrick Myers (BSME)

Enter the surface temperature, dew point temperature, and indoor air temperature into the calculator to determine the condensation resistance factor.

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Condensation Resistance Factor Formula

The following formula is used to calculate the condensation resistance factor for a given set of temperatures.

CRF = (T_s - T_d) / (T_i - T_d)

Variables:

CRF is the condensation resistance factor
T_s is the surface temperature
T_d is the dew point temperature
T_i is the indoor air temperature

To calculate the condensation resistance factor, subtract the dew point temperature from the surface temperature. Then, divide the result by the difference between the indoor air temperature and the dew point temperature.

What is Condensation Resistance Factor?

The condensation resistance factor (CRF) is a measure of a material’s ability to resist condensation formation on its surface. It is particularly important in building materials and insulation, where condensation can lead to mold growth, structural damage, and reduced thermal performance. The CRF is calculated based on the surface temperature, dew point temperature, and indoor air temperature. A higher CRF indicates better resistance to condensation, which is desirable for maintaining a healthy and durable indoor environment.

How to Calculate Condensation Resistance Factor?

The following steps outline how to calculate the Condensation Resistance Factor.

First, determine the surface temperature (T_s).
Next, determine the dew point temperature (T_d).
Next, determine the indoor air temperature (T_i).
Finally, calculate the Condensation Resistance Factor using the formula CRF = (T_s – T_d) / (T_i – T_d).
After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Surface Temperature (T_s) = 20°C

Dew Point Temperature (T_d) = 10°C

Indoor Air Temperature (T_i) = 25°C