A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U/A.Cmin

Cmin/U

U.Cmin

U/Cmin

U/A.Cmin

Cmin/U

U.Cmin

U/Cmin

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Conduction

Forced convection

Radiation

Free convection

Conduction

Forced convection

Radiation

Free convection

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P=1, x = 0 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

P=1, x = 0 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in case of heat transfer by

Convection

Conduction

Conduction and convection

Radiation

Convection

Conduction

Conduction and convection

Radiation

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

May increase or decrease depending on temperature

Increases

Decreases

Remain constant

May increase or decrease depending on temperature

Increases

Decreases

Remain constant

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.1

0.01

0.02

0.002

0.1

0.01

0.02

0.002

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Heat and Mass Transfer

Heat and Mass Transfer A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Heat and Mass Transfer Depending on the radiating properties, a body will be opaque when

Heat and Mass Transfer The concept of overall coefficient of heat transfer is used in case of heat transfer by

Heat and Mass Transfer Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in case of heat transfer by

Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of