Number of Heat Transfer Units Calculator

✖The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.ⓘ Overall Heat Transfer Coefficient [U]			+10% -10%
✖Area of heat exchanger is the surface area of the heat transfer surface within the exchanger that is responsible for exchanging heat between two fluids.ⓘ Area of Heat Exchanger [A]			+10% -10%
✖Minimum Capacity Rate is defined as the minimum quantity of heat required to raise the temperature of an object by 1 degree celcius or by 1 Kelvin per unit time.ⓘ Minimum Capacity Rate [C_min]			+10% -10%

✖The number of heat transfer units (NTU) is defined as a ratio of the overall thermal conductance to the smaller heat capacity rate.ⓘ Number of Heat Transfer Units [NTU]

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Formula

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Number of Heat Transfer Units

Formula

`"NTU" = ("U"*"A")/"C"_{"min"}`

Example

`"0.2672"=("40W/m²*K"*"6.68m²")/"1000W/K"`

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Number of Heat Transfer Units Solution

STEP 0: Pre-Calculation Summary

Formula Used

Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate
NTU = (U*A)/C_min
This formula uses 4 Variables

Variables Used

Number of Heat Transfer Units - The number of heat transfer units (NTU) is defined as a ratio of the overall thermal conductance to the smaller heat capacity rate.
Overall Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.
Area of Heat Exchanger - (Measured in Square Meter) - Area of heat exchanger is the surface area of the heat transfer surface within the exchanger that is responsible for exchanging heat between two fluids.
Minimum Capacity Rate - (Measured in Watt per Kelvin) - Minimum Capacity Rate is defined as the minimum quantity of heat required to raise the temperature of an object by 1 degree celcius or by 1 Kelvin per unit time.

STEP 1: Convert Input(s) to Base Unit

Overall Heat Transfer Coefficient: 40 Watt per Square Meter per Kelvin --> 40 Watt per Square Meter per Kelvin No Conversion Required
Area of Heat Exchanger: 6.68 Square Meter --> 6.68 Square Meter No Conversion Required
Minimum Capacity Rate: 1000 Watt per Kelvin --> 1000 Watt per Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

NTU = (U*A)/C_min --> (40*6.68)/1000

Evaluating ... ...

NTU = 0.2672

STEP 3: Convert Result to Output's Unit

0.2672 --> No Conversion Required

FINAL ANSWER

0.2672 <-- Number of Heat Transfer Units

(Calculation completed in 00.004 seconds)

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Created by Ayush gupta

University School of Chemical Technology-USCT (GGSIPU), New Delhi

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National University of Judicial Science (NUJS), Kolkata

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< 10+ Heat Exchanger Calculators

Overall Heat Transfer Coefficient for Unfinned Tube

Go Overall Heat Transfer Coefficient after Fouling = 1/((1/External Convection Heat Transfer Coefficient)+Fouling Factor on Outside of Tube+(((Outside Tube Diameter*(ln(Outside Tube Diameter/Inside Tube Diameter))))/(2*Thermal Conductivity))+((Fouling Factor on Inside of Tube*Outside Tube Surface Area)/Inside Tube Surface Area)+(Outside Tube Surface Area/(Inside Convection Heat Transfer Coefficient*Inside Tube Surface Area)))

Total Heat Transfer Coefficient for Long Cylinder

Go Heat Transfer Coefficient = ((0.023*(Mass Velocity^0.8)*(Thermal Conductivity^0.67)*(Specific Heat Capacity^0.33))/((Diameter of Tube^0.2)*(Viscosity of Fluid^0.47)))

Heat Transfer in Heat Exchanger given Cold Fluid Properties

Go Heat = modulus(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))

Heat Transfer in Heat Exchanger given Hot Fluid Properties

Go Heat = Mass of Hot Fluid*Specific Heat Capacity of Hot Fluid*(Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)

Rate of Heat Transfer using Correction Factor and LMTD

Go Heat Transfer = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Correction Factor*Log Mean Temperature Difference

Maximum Possible Rate of Heat Transfer

Go Maximum Possible Rate of Heat Transfer = Minimum Capacity Rate*(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Number of Heat Transfer Units

Go Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate

Heat Transfer in Heat Exchanger given Overall Heat Transfer Coefficient

Go Heat = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Log Mean Temperature Difference

Fouling Factor

Go Fouling Factor = (1/Overall Heat Transfer Coefficient after Fouling)-(1/Overall Heat Transfer Coefficient)

Capacity Rate

Go Capacity Rate = Mass Flow Rate*Specific Heat Capacity

< 15 Heat Exchanger and its Effectiveness Calculators

Overall Heat Transfer Coefficient for Unfinned Tube

Effectiveness of Counter-Current Heat Exchanger if Cold Fluid is Minimum Fluid

Go Effectiveness of HE when Cold Fluid is Min Fluid = (modulus((Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))

Effectiveness of Parallel-Flow Heat Exchanger if Cold Fluid is Minimum Fluid

Go Effectiveness of HE when Cold Fluid is Min Fluid = (Outlet Temperature of Cold Fluid-Inlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Effectiveness of Parallel-Flow Heat Exchanger if Hot Fluid is Minimum Fluid

Go Effectiveness of HE when Hot Fluid is Min Fluid = ((Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))

Effectiveness of Counter-Current Heat Exchanger if Hot Fluid is Minimum Fluid

Go Effectiveness of HE when Hot Fluid is Min Fluid = (Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)

Heat Transfer in Heat Exchanger given Cold Fluid Properties

Go Heat = modulus(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid))

Heat Transfer in Heat Exchanger given Hot Fluid Properties

Go Heat = Mass of Hot Fluid*Specific Heat Capacity of Hot Fluid*(Inlet Temperature of Hot Fluid-Outlet Temperature of Hot Fluid)

Rate of Heat Transfer using Correction Factor and LMTD

Go Heat Transfer = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Correction Factor*Log Mean Temperature Difference

Maximum Possible Rate of Heat Transfer

Go Maximum Possible Rate of Heat Transfer = Minimum Capacity Rate*(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)

Number of Heat Transfer Units

Go Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate

Heat Transfer in Heat Exchanger given Overall Heat Transfer Coefficient

Go Heat = Overall Heat Transfer Coefficient*Area of Heat Exchanger*Log Mean Temperature Difference

Heat Exchanger Effectiveness for Minimum Fluid

Go Effectiveness of Heat Exchanger = Temperature Difference of Minimum Fluid/Maximum Temperature Difference in Heat Exchanger

Fouling Factor

Go Fouling Factor = (1/Overall Heat Transfer Coefficient after Fouling)-(1/Overall Heat Transfer Coefficient)

Heat Exchanger Effectiveness

Go Effectiveness of Heat Exchanger = Actual Rate of Heat Transfer/Maximum Possible Rate of Heat Transfer

Capacity Rate

Go Capacity Rate = Mass Flow Rate*Specific Heat Capacity

Number of Heat Transfer Units Formula

Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate
NTU = (U*A)/C_min

What is Heat Exchanger?

A Heat Exchanger is a device that facilitates the process of heat exchange between two fluids that are at different temperatures.

What are the different types of Heat Exchanger?

Mainly Heat Exchanger are divided in 4 categories: Hairpin Type Heat Exchanger, Double Pipe Heat Exchanger, Shell and Tube Heat Exchanger & Plate Type Heat Exchanger.

How to Calculate Number of Heat Transfer Units?

Number of Heat Transfer Units calculator uses Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate to calculate the Number of Heat Transfer Units, The Number of Heat Transfer Units formula is defined as the heat transfer capacity of the heat exchanger. In the NTU method, the effectiveness of the heat exchanger is expressed in the form of three non-dimensional terms. The NTU method is useful when minimum data is provided for calculating heat transfer. Number of Heat Transfer Units is denoted by NTU symbol.

How to calculate Number of Heat Transfer Units using this online calculator? To use this online calculator for Number of Heat Transfer Units, enter Overall Heat Transfer Coefficient (U), Area of Heat Exchanger (A) & Minimum Capacity Rate (C_min) and hit the calculate button. Here is how the Number of Heat Transfer Units calculation can be explained with given input values -> 0.2672 = (40*6.68)/1000.

FAQ

What is Number of Heat Transfer Units?

The Number of Heat Transfer Units formula is defined as the heat transfer capacity of the heat exchanger. In the NTU method, the effectiveness of the heat exchanger is expressed in the form of three non-dimensional terms. The NTU method is useful when minimum data is provided for calculating heat transfer and is represented as NTU = (U*A)/C_min or Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate. The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat, Area of heat exchanger is the surface area of the heat transfer surface within the exchanger that is responsible for exchanging heat between two fluids & Minimum Capacity Rate is defined as the minimum quantity of heat required to raise the temperature of an object by 1 degree celcius or by 1 Kelvin per unit time.

How to calculate Number of Heat Transfer Units?

The Number of Heat Transfer Units formula is defined as the heat transfer capacity of the heat exchanger. In the NTU method, the effectiveness of the heat exchanger is expressed in the form of three non-dimensional terms. The NTU method is useful when minimum data is provided for calculating heat transfer is calculated using Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate. To calculate Number of Heat Transfer Units, you need Overall Heat Transfer Coefficient (U), Area of Heat Exchanger (A) & Minimum Capacity Rate (C_min). With our tool, you need to enter the respective value for Overall Heat Transfer Coefficient, Area of Heat Exchanger & Minimum Capacity Rate and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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