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Number of transfer units Formula

GoNTU relation of double pipe parallel flow heat exchanger Formula

GoNTU relation of double pipe counter flow heat exchanger Formula

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The number of transfer units is defined as ratio of overall thermal conductance to smaller heat capacity rate. NTU designates non-dimensional heat transfer size or thermal size of the exchanger. Check FAQs

NTU = A \cdot \frac{U}{C min}

NTU - Number of Transfer Units?A - Area?U - Overall Heat Transfer Coefficient?C_min - Smaller Value?

Number of transfer units Example

With values

With units

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Here is how the Number of transfer units equation looks like with Values.

Here is how the Number of transfer units equation looks like with Units.

Here is how the Number of transfer units equation looks like.

33.3333 = 50 \cdot \frac{20}{30}

33.3333 = 50m² \cdot \frac{20W/m²*°C}{30}

33.3333 = 50 \cdot \frac{20}{30}

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Number of transfer units Solution

Follow our step by step solution on how to calculate Number of transfer units?

FIRST Step Consider the formula

NTU = A \cdot \frac{U}{C min}

Next Step Substitute values of Variables

∴

NTU = 50m² \cdot \frac{20W/m²*°C}{30}

Next Step Convert Units

∴

NTU = 50m² \cdot \frac{20W/m²*K}{30}

Next Step Prepare to Evaluate

∴

NTU = 50 \cdot \frac{20}{30}

Next Step Evaluate

∴

NTU = 33.3333333333333

LAST Step Rounding Answer

∴

NTU = 33.3333

Number of transfer units Formula Elements

Variables

Number of Transfer Units

The number of transfer units is defined as ratio of overall thermal conductance to smaller heat capacity rate. NTU designates non-dimensional heat transfer size or thermal size of the exchanger.

Symbol: NTU

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Number of Transfer Units

Area

The area is the amount of two-dimensional space taken up by an object.

Symbol: A

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Area

Overall Heat Transfer Coefficient

Overall heat transfer coefficient is the overall convective heat transfer between a fluid medium (a fluid) and the surface (wall) flowed over by the fluid.

Symbol: U

Measurement: Heat Transfer CoefficientUnit: W/m²*°C

Note: Value can be positive or negative.

Formulas to find Overall Heat Transfer Coefficient

Smaller Value

Smaller value of mass flowrate of hot fluid * specific heat of hot fluid and mass flowrate of cold fluid * specific heat of cold fluid.

Symbol: C_min

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Smaller Value

Other Formulas to find Number of Transfer Units

Go NTU relation of double pipe parallel flow heat exchanger

NTU = \frac{- \ln (1 - (1 + C) \cdot ϵ)}{1 + C}

Go NTU relation of double pipe counter flow heat exchanger

NTU = (\frac{1}{C - 1}) \cdot (\ln (\frac{ϵ - 1}{C \cdot ϵ - 1}))

Go NTU relation of double pipe counter flow heat exchanger given C equal to 1

NTU = \frac{ϵ}{1 - ϵ}

Go NTU relation of double pipe counter flow heat exchanger with Cmax mixed and Cmin unmixed

NTU = - \ln (1 + (\frac{1}{C}) \cdot (\ln (1 - C \cdot ϵ)))

How to Evaluate Number of transfer units?

Number of transfer units evaluator uses Number of Transfer Units = Area*Overall Heat Transfer Coefficient/Smaller Value to evaluate the Number of Transfer Units, The Number of transfer units formula is defined as the amount of energy units transferred between the fluids in the heat exchanger. Number of Transfer Units is denoted by NTU symbol.

How to evaluate Number of transfer units using this online evaluator? To use this online evaluator for Number of transfer units, enter Area (A), Overall Heat Transfer Coefficient (U) & Smaller Value (C_min) and hit the calculate button.

FAQs on Number of transfer units

What is the formula to find Number of transfer units?

The formula of Number of transfer units is expressed as Number of Transfer Units = Area*Overall Heat Transfer Coefficient/Smaller Value. Here is an example- 33.33333 = 50*20/30.

How to calculate Number of transfer units?

With Area (A), Overall Heat Transfer Coefficient (U) & Smaller Value (C_min) we can find Number of transfer units using the formula - Number of Transfer Units = Area*Overall Heat Transfer Coefficient/Smaller Value.

What are the other ways to Calculate Number of Transfer Units?

Here are the different ways to Calculate Number of Transfer Units-

Number of Transfer Units=(-ln(1-(1+Heat capacity ratio)*Effectiveness of Heat Exchanger))/(1+Heat capacity ratio)
Number of Transfer Units=(1/(Heat capacity ratio-1))*(ln((Effectiveness of Heat Exchanger-1)/(Heat capacity ratio*Effectiveness of Heat Exchanger-1)))
Number of Transfer Units=Effectiveness of Heat Exchanger/(1-Effectiveness of Heat Exchanger)

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Number of transfer units Formula

​GoNTU relation of double pipe parallel flow heat exchanger Formula

​GoNTU relation of double pipe counter flow heat exchanger Formula

Number of transfer units Example

Number of transfer units Solution

Number of transfer units Formula Elements

Other Formulas to find Number of Transfer Units

How to Evaluate Number of transfer units?

FAQs on Number of transfer units

Variable Name

GoNTU relation of double pipe parallel flow heat exchanger Formula

GoNTU relation of double pipe counter flow heat exchanger Formula