The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

63.8

77.2

48.7

71.2

63.8

77.2

48.7

71.2

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Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Decreases

Passes through a maxima

Increases

Remains constant

Decreases

Passes through a maxima

Increases

Remains constant

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Heat Transfer
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Δt²

Δt³

Δt

√Δt

Δt²

Δt³

Δt

√Δt

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high

Higher condensing film co-efficient is desired

Condensate is corrosive in nature

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high

Higher condensing film co-efficient is desired

Condensate is corrosive in nature

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Heat Transfer
Baffle spacing

Should be less than one fifth the diameter of the shell

None of these

Is not the same as baffle pitch

Should be less than the inside diameter of the shell

Should be less than one fifth the diameter of the shell

None of these

Is not the same as baffle pitch

Should be less than the inside diameter of the shell

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Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?

Dowtherm

Water

Air

Molten sodium

Dowtherm

Water

Air

Molten sodium

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Heat Transfer

Heat Transfer For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Heat Transfer For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Heat Transfer Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer Baffle spacing

Heat Transfer Which of the following has the lowest overall heat transfer co-efficient?

Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Heat Transfer
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer
Baffle spacing

Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?