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a) A small electrically heated element of surface area 33.2 cm² is encloscd in a large vessel. When steady state is reached, the following observations are recorded Voltage across heating element,7.5V Electric current through the element, 0.68A Surface temperature of the element, 90°C The temperature of the vessel may be taken as equal to the surrounding air temperature 30 C. The emissivity of the surface of the element may be taken as 0.8. i) in) Make a sketch of the set-up Calculate the heat exchange by radiation between the element and the vessel Calculate the heat transfer from the element by natural convection and the film heat transfer coefficient.

a) A small electrically heated element of surface area 33.2 cm² is encloscd in a large vessel. When steady state is reached, the following observations are recorded Voltage across heating element,7.5V Electric current through the element, 0.68A Surface temperature of the element, 90°C The temperature of the vessel may be taken as equal to the surrounding air temperature 30 C. The emissivity of the surface of the element may be taken as 0.8. i) in) Make a sketch of the set-up Calculate the heat exchange by radiation between the element and the vessel Calculate the heat transfer from the element by natural convection and the film heat transfer coefficient.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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a) A small electrically heated element of surface area 33.2 cm² is encloscd in a large vessel. When steady state is reached, the following observations are recorded Voltage across heating element, 7.5V Electric current through the element, 0.68A Surface temperature of the clement, 90°C The temperature of the vessel may be taken as equal to the surrounding air temperature 30 C. The emissivity of the surface of the element may be taken as 0.8. Make a sketch of the set-up i) ii) Calculate the heat exchange by radiation between the element and the vessel Calculate the heat transfer from the element by natural convection and the film heat transfer coefficient.
Transcribed Image Text:a) A small electrically heated element of surface area 33.2 cm² is encloscd in a large vessel. When steady state is reached, the following observations are recorded Voltage across heating element, 7.5V Electric current through the element, 0.68A Surface temperature of the clement, 90°C The temperature of the vessel may be taken as equal to the surrounding air temperature 30 C. The emissivity of the surface of the element may be taken as 0.8. Make a sketch of the set-up i) ii) Calculate the heat exchange by radiation between the element and the vessel Calculate the heat transfer from the element by natural convection and the film heat transfer coefficient.
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