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. (a) 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.
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. (a) 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.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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.
(a) 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.
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