The formula to calculate the U value of a ground floor is:
\[ U = 0.05 + 1.65 \left( \frac{P}{A} \right) - 0.6 \left( \frac{P}{A} \right)^2 \]
Where:
A U value is a measure of the rate of heat loss per unit area times degrees. It is used in building regulations to ensure buildings are not losing too much energy through the floor. The lower the U value, the better insulated the floor is, resulting in less heat loss and more energy efficiency.
Let's assume the following values:
Using the formula:
\[ U = 0.05 + 1.65 \left( \frac{100}{1000} \right) - 0.6 \left( \frac{100}{1000} \right)^2 = 0.05 + 1.65 \times 0.1 - 0.6 \times 0.01 =0.209 \]
The U Value is 0.209.