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HomeWork01 - MECE E3311 Heat Transfer Homework 1 Arvind...

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MECE E3311 Heat Transfer: Homework 1 Arvind Narayanaswamy, Department of Mechanical Engineering, Columbia University. Please submit problems 1 through 3 in one document (to be corrected by Jonathan) and 4 through 5 in another (to be corrected by Sybille). Due date - February 3, 2009. Problem 1 Problem 1.23 – The number given in the text, [ T j = 16 . 44 o ]C, is the value that you should obtain on solving the problem. Do not use it as part of the problem. Problem 2 Problem 1.33 Problem 3 In most homes, heat leakage through windows is one of the biggest contrib- utors to the home heating bill. In this problem you will investigate two different scenarios involving two types of windows - single paned and double paned windows. Shown in Fig. 1 are two designs of windows commonly used. The interior of the house is at 22 o C and the outside is at 0 o C. The heat transfer coefficient between the interior of the house to the interior surface of the window is 10 Wm - 2 K - 1 . That between the exterior surface of the window to the outside is 20 Wm

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