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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=-ln(1-(1+C)⋅ϵ)1+C
NTU - Number of Transfer Units?C - Heat capacity ratio?ϵ - Effectiveness of Heat Exchanger?

NTU relation of double pipe parallel flow heat exchanger Example

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With units
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Here is how the NTU relation of double pipe parallel flow heat exchanger equation looks like with Values.

Here is how the NTU relation of double pipe parallel flow heat exchanger equation looks like with Units.

Here is how the NTU relation of double pipe parallel flow heat exchanger equation looks like.

0.1083Edit=-ln(1-(1+0.5Edit)⋅0.1Edit)1+0.5Edit
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NTU relation of double pipe parallel flow heat exchanger Solution

Follow our step by step solution on how to calculate NTU relation of double pipe parallel flow heat exchanger?

FIRST Step Consider the formula
NTU=-ln(1-(1+C)⋅ϵ)1+C
Next Step Substitute values of Variables
∴ NTU=-ln(1-(1+0.5)⋅0.1)1+0.5
Next Step Prepare to Evaluate
∴ NTU=-ln(1-(1+0.5)⋅0.1)1+0.5
Next Step Evaluate
∴NTU=0.108345952998517
LAST Step Rounding Answer
∴NTU=0.1083

NTU relation of double pipe parallel flow heat exchanger Formula Elements

Variables
Functions
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 UnitsOpen Variable
Heat capacity ratio
Heat capacity ratio is the ratio of cmin and cmax.
Symbol: C
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Formulas to find Heat capacity ratioOpen Variable
Effectiveness of Heat Exchanger
The effectiveness of heat exchanger is defined as the ratio of the actual heat transfer to the maximum possible heat transfer.
Symbol: ϵ
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Effectiveness of Heat ExchangerOpen Variable
ln
The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function.
Syntax: ln(Number)

Other Formulas to find Number of Transfer Units

​Go NTU relation of double pipe counter flow heat exchanger
NTU=(1C-1)⋅(ln(ϵ-1C⋅ϵ-1))
​Go NTU relation of double pipe counter flow heat exchanger given C equal to 1
NTU=ϵ1-ϵ
​Go NTU relation of double pipe counter flow heat exchanger with Cmax mixed and Cmin unmixed
NTU=-ln(1+(1C)⋅(ln(1-C⋅ϵ)))
​Go NTU relation of double pipe counter flow heat exchanger with Cmax unmixed and Cmin mixed
NTU=(-1C)⋅(1+(C⋅(ln(1-ϵ))))

How to Evaluate NTU relation of double pipe parallel flow heat exchanger?

NTU relation of double pipe parallel flow heat exchanger evaluator uses Number of Transfer Units = (-ln(1-(1+Heat capacity ratio)*Effectiveness of Heat Exchanger))/(1+Heat capacity ratio) to evaluate the Number of Transfer Units, The NTU relation of double pipe parallel flow heat exchanger formula is defined as the amount of energy units transferred between the fluids in the double pipe parallel flow heat exchanger. Number of Transfer Units is denoted by NTU symbol.

How to evaluate NTU relation of double pipe parallel flow heat exchanger using this online evaluator? To use this online evaluator for NTU relation of double pipe parallel flow heat exchanger, enter Heat capacity ratio (C) & Effectiveness of Heat Exchanger (ϵ) and hit the calculate button.

FAQs on NTU relation of double pipe parallel flow heat exchanger

What is the formula to find NTU relation of double pipe parallel flow heat exchanger?
The formula of NTU relation of double pipe parallel flow heat exchanger is expressed as Number of Transfer Units = (-ln(1-(1+Heat capacity ratio)*Effectiveness of Heat Exchanger))/(1+Heat capacity ratio). Here is an example- 0.108346 = (-ln(1-(1+0.5)*0.1))/(1+0.5).
How to calculate NTU relation of double pipe parallel flow heat exchanger?
With Heat capacity ratio (C) & Effectiveness of Heat Exchanger (ϵ) we can find NTU relation of double pipe parallel flow heat exchanger using the formula - Number of Transfer Units = (-ln(1-(1+Heat capacity ratio)*Effectiveness of Heat Exchanger))/(1+Heat capacity ratio). This formula also uses Natural Logarithm (ln) function(s).
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=(1/(Heat capacity ratio-1))*(ln((Effectiveness of Heat Exchanger-1)/(Heat capacity ratio*Effectiveness of Heat Exchanger-1)))OpenImg
  • Number of Transfer Units=Effectiveness of Heat Exchanger/(1-Effectiveness of Heat Exchanger)OpenImg
  • Number of Transfer Units=-ln(1+(1/Heat capacity ratio)*(ln(1-Heat capacity ratio*Effectiveness of Heat Exchanger)))OpenImg
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