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

Cmin/U

U/Cmin

U/A.Cmin

U.Cmin

Cmin/U

U/Cmin

U/A.Cmin

U.Cmin

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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

None of these

Same

Greater

Less

None of these

Same

Greater

Less

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.45

0.55

0.4

0.75

0.45

0.55

0.4

0.75

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Fourth power of temperature

Absolute temperature

Fourth power of absolute temperature

Square of temperature

Fourth power of temperature

Absolute temperature

Fourth power of absolute temperature

Square of temperature

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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

0.02

0.1

0.002

0.01

0.02

0.1

0.002

0.01

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Dependent on the viscosity

More than those for liquids

More than those for solids

Less than those for liquids

Dependent on the viscosity

More than those for liquids

More than those for solids

Less than those for liquids

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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 In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Heat and Mass Transfer 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

Heat and Mass Transfer According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

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 The thermal diffusivities for gases are generally

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
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

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
The thermal diffusivities for gases are generally