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4. A cold storage room has a composite wall made of three layers of different materials namely fire burnt bricks, cork and cement. The outer layer of the composite wall is made of ordinary fire burnt bricks of thickness 200 mm, the middle layer of cork, 100 mm thick and a cement inner layer of 60 mm thick. The inner temperature of the cold room is -20°C and the outside temperature is 30°C. The thermal conductivities of the three layers are - brick 7.1 x 10' W/m °C, cork 4.25 x 10 W/m °C and cement 7.25 x 10 W/m °C. Calçulate X (a) the steady state rate of heat gain per unit area of the wall, (b) the temperature at the interfaces of the composite wall, (c) the percentages of the total heat transfer resistance offered by the individual layers,

4. A cold storage room has a composite wall made of three layers of different materials namely fire burnt bricks, cork and cement. The outer layer of the composite wall is made of ordinary fire burnt bricks of thickness 200 mm, the middle layer of cork, 100 mm thick and a cement inner layer of 60 mm thick. The inner temperature of the cold room is -20°C and the outside temperature is 30°C. The thermal conductivities of the three layers are - brick 7.1 x 10' W/m °C, cork 4.25 x 10 W/m °C and cement 7.25 x 10 W/m °C. Calçulate X (a) the steady state rate of heat gain per unit area of the wall, (b) the temperature at the interfaces of the composite wall, (c) the percentages of the total heat transfer resistance offered by the individual layers,

Introduction to Chemical Engineering Thermodynamics
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
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4. A cold storage room has a composite wall made of three layers of different materials namely fire burnt bricks, cork and cement. The outer layer of the composite wall is made of ordinary fire burnt bricks of thickness 200 mm, the middle layer of cork, 100 mm thick and a cement inner layer of 60 mm thick. The inner temperature of the cold room is -20°C and the outside temperature is 30°C. The thermal conductivities of the three layers are - brick 7.1 x 10' W/m °C, cork 4.25 x 10 W/m °C and cement 7.25 x 10 W/m °C. Calçulate X (a) the steady state rate of heat gain per unit area of the wall, (b) the temperature at the interfaces of the composite wall, (c) the percentages of the total heat transfer resistance offered by the individual layers,
Transcribed Image Text:4. A cold storage room has a composite wall made of three layers of different materials namely fire burnt bricks, cork and cement. The outer layer of the composite wall is made of ordinary fire burnt bricks of thickness 200 mm, the middle layer of cork, 100 mm thick and a cement inner layer of 60 mm thick. The inner temperature of the cold room is -20°C and the outside temperature is 30°C. The thermal conductivities of the three layers are - brick 7.1 x 10' W/m °C, cork 4.25 x 10 W/m °C and cement 7.25 x 10 W/m °C. Calçulate X (a) the steady state rate of heat gain per unit area of the wall, (b) the temperature at the interfaces of the composite wall, (c) the percentages of the total heat transfer resistance offered by the individual layers,
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