Solutions to In-class Exercise One

Jacaranda (Engineering) 3333 Mail Code Phone: E-mail: 8348 Fax: College of Engineering and Computer ScienceMechanical Engineering DepartmentMechanical Engineering 375 Heat Transfer Spring 2007 Number 17629 Instructor: Larry Caretto Solutions to In-class Exercise One 1. The inner and outer surfaces of a thick 2-m by 2-m window glass in winter are 10 C and 3 C, respectively. If the thermal conductivity of the glass is W/m K, determine the amount of heat loss through the glass over a period of 5 h. What would your answer be if the glass were 1 cm thick? (Problem from text.) This is a basic conduction problem where Q&=kA T/L. The heat loss from the inside to the outside is found by taking T = 10oC 3oC = 7oC = 7 K, the inside to outside temperature difference. The area, A, is (2 m)(2 m) = 4 m2, and we are given the thermal conductivity, k = W/m K. We are asked to find the heat for two values of L: cm = m and 1 cm = m.

E-mail: lcaretto@csun.edu 8348 Fax: 818.677.7062 College of Engineering and Computer Science Mechanical Engineering Department Mechanical Engineering 375 Heat Transfer Spring 2007 Number 17629 Instructor: Larry Caretto Solutions to In-class Exercise One 1. The inner and outer surfaces of a 0.5-cm thick 2-m by 2-m window glass in winter are 10°C

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