Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Finned tube heat exchanger with air inside and steam outside

Shell and tube heat exchanger with air inside tubes and steam on shell side

Finned tube heat exchanger with air outside and steam inside

Shell and tube heat exchanger with air on shell side and steam inside tubes

Finned tube heat exchanger with air inside and steam outside

Shell and tube heat exchanger with air inside tubes and steam on shell side

Finned tube heat exchanger with air outside and steam inside

Shell and tube heat exchanger with air on shell side and steam inside tubes

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

Remains unchanged

May increase or decrease ; depending on temperature

Decreases

Increases

Remains unchanged

May increase or decrease ; depending on temperature

Decreases

Increases

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Get economical temperature difference by using moderate pressure steam

Concentrate heat sensitive materials

Achieve very high concentration of the final product

Facilitate forward feeding in multiple effect evaporation

Get economical temperature difference by using moderate pressure steam

Concentrate heat sensitive materials

Achieve very high concentration of the final product

Facilitate forward feeding in multiple effect evaporation

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

1.66

Dependent on NRe only

88.66

3.66

1.66

Dependent on NRe only

88.66

3.66

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Heat Transfer
Unsteady state heat conduction occurs, when

Temperature distribution is dependent on time

Three dimensional heat flow is concerned

Heat flows in one direction only

Temperature distribution is independent of time

Temperature distribution is dependent on time

Three dimensional heat flow is concerned

Heat flows in one direction only

Temperature distribution is independent of time

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Heat Transfer
Reason for operating an evaporator in multiple effect is to secure

Decreased steam consumption

Both A and B

Increased capacity

Increased steam economy

Decreased steam consumption

Both A and B

Increased capacity

Increased steam economy

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Heat Transfer

Heat Transfer Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer With the increase of temperature, the Col-burn jH factor

Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Heat Transfer Unsteady state heat conduction occurs, when

Heat Transfer Reason for operating an evaporator in multiple effect is to secure

Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Heat Transfer
With the increase of temperature, the Col-burn jH factor

Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Heat Transfer
Unsteady state heat conduction occurs, when

Heat Transfer
Reason for operating an evaporator in multiple effect is to secure