Composite plane wall: The walls of a refrigerator are typically constructed by sandwiching a layer of insulation between sheet metal panels. Consider a wall made from fiberglass insulation of thermal conductivity ki = 0.046 W/m.K and thickness Li = 55 mm and steel panels, each of thermal conductivity kp = 60 W/m.K and thickness Lp = 2.5mm. If the wall separates refrigerated air at T∞,i = 4°C from ambient air at T∞,o = 25°C, what is the heat rate per unit surface area into the fridge? Coefficients associated with natural convection at the inner and outer surfaces may be approximated as hi = ho = 5 W/m2 .K.
Composite plane wall: The walls of a refrigerator are typically constructed by sandwiching a layer of insulation between sheet metal panels. Consider a wall made from fiberglass insulation of thermal conductivity ki = 0.046 W/m.K and thickness Li = 55 mm and steel panels, each of thermal conductivity kp = 60 W/m.K and thickness Lp = 2.5mm. If the wall separates refrigerated air at T∞,i = 4°C from ambient air at T∞,o = 25°C, what is the heat rate per unit surface area into the fridge? Coefficients associated with natural convection at the inner and outer surfaces may be approximated as hi = ho = 5 W/m2 .K.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Heat Transfer
Composite plane wall: The walls of a refrigerator are typically constructed by sandwiching a
layer of insulation between sheet metal panels. Consider a wall made from fiberglass insulation of thermal
conductivity ki = 0.046 W/m.K and thickness Li = 55 mm and steel panels, each of thermal conductivity kp =
60 W/m.K and thickness Lp = 2.5mm. If the wall separates refrigerated air at T∞,i = 4°C from ambient air at
T∞,o = 25°C, what is the heat rate per unit surface area into the fridge? Coefficients associated with natural
convection at the inner and outer surfaces may be approximated as hi = ho = 5 W/m2
.K.
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