An industrial freezer is designed to operate with an internal air temperature of -20°C when the external air temperature is 25°C and the internal and external heat transfer coefficients are 12 W/m² K and 8 W/m² K, respectively. The walls of the freezer are composite construction, comprising of an inner layer of plastic (k = 1 W/m K, and thickness of 3 mm), and an outer layer of stainless steel (k = 16 W/m K, and thickness of 1 mm). Sandwiched between these two layers is a layer of insulation material with k=0.07 W/m K. Find the width of the insulation that is required to reduce the convective heat oss to 15 W/m².
An industrial freezer is designed to operate with an internal air temperature of -20°C when the external air temperature is 25°C and the internal and external heat transfer coefficients are 12 W/m² K and 8 W/m² K, respectively. The walls of the freezer are composite construction, comprising of an inner layer of plastic (k = 1 W/m K, and thickness of 3 mm), and an outer layer of stainless steel (k = 16 W/m K, and thickness of 1 mm). Sandwiched between these two layers is a layer of insulation material with k=0.07 W/m K. Find the width of the insulation that is required to reduce the convective heat oss to 15 W/m².
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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An industrial freezer is designed to operate with an internal air temperature of -20°C when the external
air temperature is 25°C and the internal and external heat transfer coefficients are 12 W/m² K and 8
W/m² K, respectively. The walls of the freezer are composite construction, comprising of an inner
layer of plastic (k = 1 W/m K, and thickness of 3 mm), and an outer layer of stainless steel (k-16
W/m K, and thickness of 1 mm). Sandwiched between these two layers is a layer of insulation material
with k=0.07 W/m K. Find the width of the insulation that is required to reduce the convective heat
loss to 15 W/m².
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