Question

A window in a house has a rectangular shape of 2.0 m by 1.0 m. The glass in the window is 0.5 cm thick, with a thermal conductivity of 0.84 W/(m oC). The temperature in the house is 20.5 °C, and the temperature outside is 4 oC. How much heat is lost through this window in one minute? Don't use scientific notations

Answer 1

P = 5280 W

Step-by-step explanation:

The conductivity of the materials determines that heat flows from the hot part to the cold part, the equation for thermal conductivity transfer is

P = Q / t = k A (
`T_(h)` -
`T_(c)`) / L

Where k is the thermal conductivity of the glass 0.8 W / ºC, A the area of ​​the window, T the temperature and L is glass thickness

Let's calculate the window area

A = l * a

A = 2.0 1.0

A = 2.0 m²

Let's replace

L = 0.5 cm (1 m / 100 cm) = 0.005 m

P = 0.8 2 (20.5 - 4) / 0.005

P = 5280 W