Question

What is the rate of the entropy change of the universe as heat leaks out a window, consisting of a single pane of glass that is 0.5 cm thick and 1.0 m2 in area, where the indoor temperature is 25°C and the outdoor temperature is -10°C?

Answer 1

The change in entropy is 1.6 W/K.

Step-by-step explanation:

Thickness, d = 0.5 cm

Area, A = 1 m^2

T = 25°C

T' = - 10°C

Coefficient of thermal conductivity of glass, K = 0.8 W/mK

The change in entropy is given by

S = Q/T

Here,

`S =(Q)/(T)\\\\S = (K A (T - T'))/(d(T - T'))\\\\S = (0.8* 1)/(0.5) = 1.6 W/K`