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1. A hot plate 1m x 0.5 m at 130°C is kept vertically in still air at 20°C, determine a) Heat Transfer Coefficient and Heat transfer rate Take properties of air at 75°C as C, = 1.007 kJ/kg°C, p = 1.07 kg/m', k = 0.029 W/m°C, v = 19.1 x 10ʻm²/s. b) Time required for cooling plate from 180°C to 80°C, if the heat transfer is due to convection only. Take the mass of plate as 20 kg and C, = 0.4 kl/kg°C and the ambient air temperature as 20°c. Plate 130°C)

1. A hot plate 1m x 0.5 m at 130°C is kept vertically in still air at 20°C, determine a) Heat Transfer Coefficient and Heat transfer rate Take properties of air at 75°C as C, = 1.007 kJ/kg°C, p = 1.07 kg/m', k = 0.029 W/m°C, v = 19.1 x 10ʻm²/s. b) Time required for cooling plate from 180°C to 80°C, if the heat transfer is due to convection only. Take the mass of plate as 20 kg and C, = 0.4 kl/kg°C and the ambient air temperature as 20°c. Plate 130°C)

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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1. A hot plate 1m x 0.5 m at 130°C is kept vertically in still air at 20°C, determine a) Heat Transfer Coefficient and Heat transfer rate Take properties of air at 75°C as C, = 1.007 kJ/kg°C, p = 1.07 kg/m², k = 0.029 W/m°C, v = 19.1 x 10 m²/s. b) Time required for cooling plate from 180°C to 80°C, if the heat transfer is due to convection only. Take the mass of plate as 20 kg and C, = 0.4 kJ/kg°C and the ambient air temperature as 20°C. Plate 6, - 130°C) -20°C
Transcribed Image Text:1. A hot plate 1m x 0.5 m at 130°C is kept vertically in still air at 20°C, determine a) Heat Transfer Coefficient and Heat transfer rate Take properties of air at 75°C as C, = 1.007 kJ/kg°C, p = 1.07 kg/m², k = 0.029 W/m°C, v = 19.1 x 10 m²/s. b) Time required for cooling plate from 180°C to 80°C, if the heat transfer is due to convection only. Take the mass of plate as 20 kg and C, = 0.4 kJ/kg°C and the ambient air temperature as 20°C. Plate 6, - 130°C) -20°C
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