1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

22 min

44 min

15 min

51 min

22 min

44 min

15 min

51 min

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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

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

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high

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Heat Transfer
Forced circulation evaporators are normally used for concentrating liquids having

High viscosity

Scaling characteristics

Both A & B

Neither A nor B

High viscosity

Scaling characteristics

Both A & B

Neither A nor B

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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

37

50

32

45

37

50

32

45

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Heat Transfer
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

K/h0

2hi/K

2K/h0

hi/K

K/h0

2hi/K

2K/h0

hi/K

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Heat Transfer
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

Colburn

Prandtl

Reynolds

None of these

Colburn

Prandtl

Reynolds

None of these

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Heat Transfer

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 Forced circulation evaporators are normally used for concentrating liquids having

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 The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

Heat Transfer The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

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
Forced circulation evaporators are normally used for concentrating liquids having

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
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

Heat Transfer
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.