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2.4 In the SI system, thermal conductivity has the unit W/(m K). The thermal conductivity of a solid material can be calculated as k = where Q is the rate of hea! transfer, x is the thickness of solid, A is the area of heat transfer and AT' is the temperature difference across the solid. The following values were obtained experimentally: Q = 10 000 kJ/h. A = 1 m², x 100 mm and AT = 800 K. ΑΔΤ (a) Calculate the thermal conductivity of the solid in W/(m K). (b) Express the thermal conductivity in kcal/(hm °C).

2.4 In the SI system, thermal conductivity has the unit W/(m K). The thermal conductivity of a solid material can be calculated as k = where Q is the rate of hea! transfer, x is the thickness of solid, A is the area of heat transfer and AT' is the temperature difference across the solid. The following values were obtained experimentally: Q = 10 000 kJ/h. A = 1 m², x 100 mm and AT = 800 K. ΑΔΤ (a) Calculate the thermal conductivity of the solid in W/(m K). (b) Express the thermal conductivity in kcal/(hm °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
Section: Chapter Questions
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2.4 In the SI system, thermal conductivity has the unit W/(m K). The thermal xQ conductivity of a solid material can be calculated as k=- where is the rate of heat ΑΔΤ transfer, x is the thickness of solid, A is the area of heat transfer and AT is the temperature difference across the solid. The following values were obtained experimentally: Q = 10 000 kJ/h, A = 1 m², x 100 mm and AT = 800 K. (a) Calculate the thermal conductivity of the solid in W/(m K). (b) Express the thermal conductivity in kcal/(h m °C). (c) If thermal conductivity of a second material is 0.15 Btu/(h ft °F), which one will make a better thermal insulator?
Transcribed Image Text:2.4 In the SI system, thermal conductivity has the unit W/(m K). The thermal xQ conductivity of a solid material can be calculated as k=- where is the rate of heat ΑΔΤ transfer, x is the thickness of solid, A is the area of heat transfer and AT is the temperature difference across the solid. The following values were obtained experimentally: Q = 10 000 kJ/h, A = 1 m², x 100 mm and AT = 800 K. (a) Calculate the thermal conductivity of the solid in W/(m K). (b) Express the thermal conductivity in kcal/(h m °C). (c) If thermal conductivity of a second material is 0.15 Btu/(h ft °F), which one will make a better thermal insulator?
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