Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

50

37

45

32

50

37

45

32

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

1/U₂ - 1/U₁

U₁ - U₂

U₂ - U₁

1/U₁ - 1/U₂

1/U₂ - 1/U₁

U₁ - U₂

U₂ - U₁

1/U₁ - 1/U₂

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

1

18

7

26

1

18

7

26

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Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Both will absorb equal amount of radiation from the surrounding in the beginning

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant

Both the spheres will emit equal amount of radiation per unit time in the beginning

Both B & C

Both will absorb equal amount of radiation from the surrounding in the beginning

The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant

Both the spheres will emit equal amount of radiation per unit time in the beginning

Both B & C

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Heat Transfer
The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Cummulatively decreases

Cummulatively increases

Remains constant

And the surface conductance increase

Cummulatively decreases

Cummulatively increases

Remains constant

And the surface conductance increase

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Heat Transfer
Double pipe heat exchangers are preferably useful, when

High viscosity liquid is to be cooled

Overall heat transfer co-efficient is very high

Requirement of heat transfer area is low

A corrosive liquid is to be heated

High viscosity liquid is to be cooled

Overall heat transfer co-efficient is very high

Requirement of heat transfer area is low

A corrosive liquid is to be heated

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Heat Transfer

Heat Transfer Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Heat Transfer Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

Heat Transfer Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

Heat Transfer A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Heat Transfer The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Heat Transfer Double pipe heat exchangers are preferably useful, when

Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Heat Transfer
The film thickness for laminar film condensation on vertical surface __________ from top to bottom.

Heat Transfer
Double pipe heat exchangers are preferably useful, when