C.Alternate Floor Protection Calculation

Material

Thermal Conductivity: k value

The k value indicates the amount of heat (in BTU’s) that will flow in 1 hour through 1 square foot of a uniform mate- rial 1 inch thick for each degree (F) of temperature differ- ence from one side of the material to the other.

The LOWER the k factor means less heat is being con- ducted through the non-combustible material to the com- bustible material beneath it.

The k value of a material must be equal or smaller then the required k value to be acceptable.

(BTU) (inch) (foot2 (hour) (oF)

Thermal Resistance: R value

The R value is a measure of a material’s resistance to heat transfer.

R value is convenient when more than one material is used since you can add the R values together, where- as you can not do this for k value.

The HIGHER the R factor means less heat is being conducted through the non-combustible material to the combustible material beneath it.

The R value of a material must be equal or larger then the required R value to be acceptable.

Conversion Procedure

1.Convert specification to R-value

a.R-value given - no conversion needed

b.k-factor is given with a required thickness (T) in inches. [R = 1/k X T]

c.K-factor is given with a required thickness (T) in inches. [R = (1/K X 12) X T]

d.r-factor is given with a required thickness (T) in inches. [R = r X T]

2.Determine the R-value of the proposed alternate floor protector

a.Use the formula in step 1 to convert values not expressed as “R”.

b.For multiple layers, add R-values of each layer to determine overall R-value.

3.If the overall R-value of the system is greater than the R-value of the specified floor protector, the alternate is ac- ceptable.

Heatilator • ECO-WINS18 • 7065-132B • August 29 2011

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Heatiator ECO-WINS18 Alternate Floor Protection Calculation, Thermal Conductivity k value, Thermal Resistance R value
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ECO-WINS18 specifications

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