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.

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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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