Calculating Heat Loss Through Attic Insulation
How can we calculate the heat loss per hour through attic insulation in a ranch house based on given data?
Understanding Heat Loss Calculation:
The given data states that a 150 m2 ranch house has glass fiber insulation 20 cm thick in the attic. The outside temperature is 0 °C, while the house is heated to 20 °C with a thermal conductivity of 0.042 J/(m*s*C). We need to calculate the heat loss per hour through the attic insulation.
Calculating Heat Loss:
To calculate the heat loss per hour through the attic insulation, we use the formula for heat transfer:
Heat loss per hour = (Thermal conductivity) * (Area) * (Temperature difference) / (Thickness)
Given values:
Thermal conductivity = 0.042 J/(m*s*C)
Area = 150 m2
Temperature difference = (20 C - 0 C) = 20 C
Thickness = 20 cm = 0.2 m
Plugging in the values:
Heat loss per hour = (0.042 J/(m*s*C)) * (150 m2) * (20 C) / (0.2 m) = 1260 J/h
Therefore, the heat loss per hour through the attic insulation is 1260 J/h. This means that 1260 joules of heat energy are lost every hour.