MT 518 HW 4 Prob. Solutions

# MT 518 HW 4 Prob. Solutions - Page 1 of 4 MT 518 Homework...

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Page 1 of 4 MT 518 Homework Problem Solutions – Lecture #4 4.1 An unheated garage is placed on the north wall of a building to act as a thermal buffer zone. If the garage has roof area A r , window area A wi , door area A d and wall area A wa what is the effective U value for the north wall of the building if its area is A n ? The garage floor is well insulated and has negligible heat loss. Express the effective U value in terms of the U values and areas of the several garage surfaces. n r r d d w w wi wi equivalent n r r d d w w wi wi n n r r d d w w wi wi n n r d w wi n A A U A U A U A U U U A U A U A U A U A U or t A U t A U t A U t A U t A U Q Q Q Q Q + + + = = + + + = + + + = + + + =

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Page 2 of 4 4.2 Determine the overhang length needed for a window 5 ft high to be in the shade on August 21 in Newark, NJ. The widow is 2 ft. from the ground and the overhang is to be mounted 6 in. above the window. Prepare the shadow and the Sun-Path maps.
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## This homework help was uploaded on 04/04/2011 for the course MT 518 taught by Professor Cohn during the Spring '11 term at Stevens.

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MT 518 HW 4 Prob. Solutions - Page 1 of 4 MT 518 Homework...

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