Lesson: Thermal Conduction
In this lesson, we will learn how to calculate the rate at which heat moves through a material given its thermal conductivity.
Sample Question Videos
Worksheet: 21 Questions • 3 Videos
The factor of an object is the ratio of its length in the direction in which it conducts heat to the thermal conductivity of its constituent materials.
A layer of drywall has an factor of 0.80. An exterior wall of a house is 4.5 m tall and 8.5 m wide. The exterior wall consists of an exterior layer of drywall which covers a layer of fiberglass batts that is 3.5 cm thick, behind which is a layer of insulated siding that has an factor of 2.1. Determine the rate of conductive heat loss through the wall of the house when the interior temperature is and the exterior temperature is . Use a value of for the thermal conductivity of fiberglass.
The thermal conductivity of a brick is 1 W/m⋅K. The thickness of the brick is 10 cm. What is the heat flux through the brick if a temperature difference of 100 K is applied across it?
The total surface area of a house is 300 m2. The average thickness of the house walls is 0.10 m and their thermal conductivity is kW/m⋅K. How much energy must be supplied to the house in a day to keep its interior temperature higher than the temperature outside.