Question

Suppose a house's walls are 11.5 cm thick and and have an average thermal conductivity twice that of glass wool. Calculate the rate of heat conduction, in watts, through the house's walls. Assume there are no windows or doors. The surface area of the walls is 135 m2 and their inside surface is at 15°C, while their outside surface is at 4.95°C.

Answer 1

To calculate the rate of heat conduction through the house walls, you can use the formula: Q = (k*A*(ΔT))/d. Substitute the given values into the formula and calculate the rate of heat conduction.

To calculate the rate of heat conduction through the house walls, we can use the formula:

Q = (k*A*(ΔT))/d

Where Q is the rate of heat conduction, k is the thermal conductivity, A is the surface area of the walls, ΔT is the temperature difference, and d is the thickness of the walls.

First, we need to calculate the thermal conductivity of glass wool. Let's assume the thermal conductivity of glass wool is 'x'. Since the average thermal conductivity of the house walls is twice that of glass wool, the thermal conductivity of the walls is 2x.

Now, we can substitute the given values into the formula and solve for Q:

Q = (2x * 135 * (15 - 4.95)) / 0.115

Use the appropriate units for the values and calculate Q to find the rate of heat conduction through the house walls.