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

32

37

45

50

32

37

45

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Heat Transfer
What is the emissivity of a black body?

0.9

0.5

1

0.9

0.5

1

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr

NPr-1

NPr-1/3

NPr1/3

NPr

NPr-1

NPr-1/3

NPr1/3

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Heat Transfer
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Greater than that for uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Less than that of the uninsulated steam pipe

Equal to that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Less than that of the uninsulated steam pipe

Equal to that of the uninsulated steam pipe

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Heat Transfer
Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Flexibility possible in the baffle arrangement

High heat transfer co-efficient

Low pressure drop

Less corrosion problems

Flexibility possible in the baffle arrangement

High heat transfer co-efficient

Low pressure drop

Less corrosion problems

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

the least

no

lower

the largest

the least

no

lower

the largest

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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 What is the emissivity of a black body?

Heat Transfer For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Heat Transfer Controlling heat transfer film co-efficient is the one, which offers __________ resistance to 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
What is the emissivity of a black body?

Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer
Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.