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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/°K
W/m
W/m°K
W/m²

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Heat Transfer
In a cooling tower, water becomes cool by

Loosing latent heat
Heat transfer to surroundings
Loosing sensible heat
Vaporisation due to heat loss to air

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Heat Transfer
Heat flux is the time rate of heat transfer per unit

length
area
volume
none of the listed here

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Heat Transfer
Small scale evaporation is done in a

Condenser
Multiple effect evaporator
Steam jacketed kettle
Heat exchanger

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

KA/x
A/Kx
X/KA
K/Ax

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

Remains unchanged
Decreases
May increase or decrease ; depending on temperature
Increases

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