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Heat Loss from R-Value Calculator

Formula

To calculate the Heat Loss (HLR):

$HLR = \frac{SA \cdot dT}{R}$

Where:

$HLR$ is the Heat Loss in BTU/hr
$SA$ is the Surface Area in square feet (ft²)
$dT$ is the Temperature Differential in degrees Fahrenheit (°F)
$R$ is the R-Value

What is Heat Loss from R-Value?

Heat loss from R-Value refers to the amount of heat that escapes through a material with a given R-Value, which measures the material's resistance to heat flow. This calculation is important for understanding the insulation properties of building materials and ensuring energy efficiency in homes and buildings.

Example Calculation 1

Let's assume the following values:

Surface Area ( $SA$ ) = 500 ft²
Temperature Differential ( $dT$ ) = 30°F
R-Value ( $R$ ) = 10

Using the formula:

$HLR = \frac{500 \cdot 30}{10} = 1500 \text{ BTU/hr}$

The Heat Loss is 1500 BTU/hr.

Example Calculation 2

Let's assume the following values:

Surface Area ( $SA$ ) = 1000 ft²
Temperature Differential ( $dT$ ) = 25°F
R-Value ( $R$ ) = 15

Using the formula:

$HLR = \frac{1000 \cdot 25}{15} = 1666.67 \text{ BTU/hr}$

The Heat Loss is 1666.67 BTU/hr.