Problem 2: Consider a 1-m-high and 2-m-wide double pane window consisting of a 3-mm-thick layers of glass (k=0.78 W/m-K) separated by a 10-mm-wide stagnant air space (k=0.026 W/m-K). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during whích the room is maintained at 20°C while the temperature of the outdoors is 0°C. Take the convection heat transfer coefficients on the inner and the outer surfaces of the window to be hn 20 W/m?-K and ho 30 W/m-K. (Ans: 81.3 W, 18 C).

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.