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17.30 Consider the composite solid shown. Solid A is a ther- mally conductive material that is 0.5-cm thick and has a thermal conductivity, KA = 50 W/m K. The back side of solid A (x = 0) is thermally insulated. Electrical current is applied to solid A such that 20 W per cm³ is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of kg = 20 W/m K. The surface of solid B is exposed to air. The surface temperature, Ts, of solid B is 80 C. The bulk air temperature is constant at 30 C. The process is at steady state. a. What is the heat-transfer rate per unit area (flux) at x = L₂? What is the temperature T₁ at x = L₁, the boundary between solid A and solid B? b. What is the required convective heat-transfer coefficient, h, for the flowing air? C. What is the temperature To at x = 0, the insulating side of solid A?

17.30 Consider the composite solid shown. Solid A is a ther- mally conductive material that is 0.5-cm thick and has a thermal conductivity, KA = 50 W/m K. The back side of solid A (x = 0) is thermally insulated. Electrical current is applied to solid A such that 20 W per cm³ is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of kg = 20 W/m K. The surface of solid B is exposed to air. The surface temperature, Ts, of solid B is 80 C. The bulk air temperature is constant at 30 C. The process is at steady state. a. What is the heat-transfer rate per unit area (flux) at x = L₂? What is the temperature T₁ at x = L₁, the boundary between solid A and solid B? b. What is the required convective heat-transfer coefficient, h, for the flowing air? C. What is the temperature To at x = 0, the insulating side of solid A?

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
Problem 1.1P
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17.30 Consider the composite solid shown. Solid A is a ther- mally conductive material that is 0.5-cm thick and has a thermal conductivity, KA = 50 W/m K. The back side of solid A (x = 0) is thermally insulated. Electrical current is applied to solid A such that 20 W per cm³ is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of kg = 20 W/m K. The surface of solid B is exposed to air. The surface temperature, Ts, of solid B is 80 C. The bulk air temperature is constant at 30 C. The process is at steady state. a. What is the heat-transfer rate per unit area (flux) at x = L₂? What is the temperature T₁ at x = L₁, the boundary between solid A and solid B? b. What is the required convective heat-transfer coefficient, h, for the flowing air? C. What is the temperature To at x = 0, the insulating side of solid A?
Transcribed Image Text:17.30 Consider the composite solid shown. Solid A is a ther- mally conductive material that is 0.5-cm thick and has a thermal conductivity, KA = 50 W/m K. The back side of solid A (x = 0) is thermally insulated. Electrical current is applied to solid A such that 20 W per cm³ is generated as heat. Solid B is 0.2-cm thick and has a thermal conductivity of kg = 20 W/m K. The surface of solid B is exposed to air. The surface temperature, Ts, of solid B is 80 C. The bulk air temperature is constant at 30 C. The process is at steady state. a. What is the heat-transfer rate per unit area (flux) at x = L₂? What is the temperature T₁ at x = L₁, the boundary between solid A and solid B? b. What is the required convective heat-transfer coefficient, h, for the flowing air? C. What is the temperature To at x = 0, the insulating side of solid A?
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