The manufacturing process for making a 55 cm X 70 cm antiviral silver coated plastic sheet used to make a face shield involves heating the material at 400°C followed by a special treatment at 360°C for 20 mins. When a uniform temperature of 360°C is reached within the material, the silver coated sheet is immersed into a solution at 30°C. The thickness of this silver coated sheet is 9 mm. What is the time at which the temperature of the sheet becomes 125 °C ? Properties of the sheet: Density: 8500kg/m3; Cp= 0.37 kJ/kgK; thermal conductivity, K= 380 W/mK; convective heat transfer coefficient, h=110 W/w2K. .What is the rate of cooling after 2 mins?
The manufacturing process for making a 55 cm X 70 cm antiviral silver coated plastic sheet used to make a face shield involves heating the material at 400°C followed by a special treatment at 360°C for 20 mins. When a uniform temperature of 360°C is reached within the material, the silver coated sheet is immersed into a solution at 30°C. The thickness of this silver coated sheet is 9 mm. What is the time at which the temperature of the sheet becomes 125 °C ? Properties of the sheet: Density: 8500kg/m3; Cp= 0.37 kJ/kgK; thermal conductivity, K= 380 W/mK; convective heat transfer coefficient, h=110 W/w2K. .What is the rate of cooling after 2 mins?
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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Transcribed Image Text:The manufacturing process for making a 55 cm X 70 cm antiviral silver coated
plastic sheet used to make a face shield involves heating the material at 400°C
followed by a special treatment at 360°C for 20 mins. When a uniform
temperature of 360°C is reached within the material, the silver coated sheet is
immersed into a solution at 30°C. The thickness of this silver coated sheet is 9
mm.
What is the time at which the temperature of the sheet becomes 125 °C ?
Properties of the sheet: Density: 8500kg/m3; Cp= 0.37 kJ/kgK; thermal
conductivity, K= 380 W/mK; convective heat transfer coefficient, h=110 W/w2K.
.What is the rate of cooling after 2 mins?
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