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Number of Heat Transfer Units Formula

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The number of heat transfer units (NTU) is defined as a ratio of the overall thermal conductance to the smaller heat capacity rate. Check FAQs

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

NTU - Number of Heat Transfer Units?U - Overall Heat Transfer Coefficient?A - Area of Heat Exchanger?C_min - Minimum Capacity Rate?

Number of Heat Transfer Units Example

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Here is how the Number of Heat Transfer Units equation looks like with Values.

Here is how the Number of Heat Transfer Units equation looks like with Units.

Here is how the Number of Heat Transfer Units equation looks like.

0.2672 = \frac{40 \cdot 6.68}{1000}

0.2672 = \frac{40W/m²*K \cdot 6.68m²}{1000W/K}

0.2672 = \frac{40 \cdot 6.68}{1000}

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Number of Heat Transfer Units Solution

Follow our step by step solution on how to calculate Number of Heat Transfer Units?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

NTU = \frac{40W/m²*K \cdot 6.68m²}{1000W/K}

Next Step Prepare to Evaluate

∴

NTU = \frac{40 \cdot 6.68}{1000}

LAST Step Evaluate

∴

NTU = 0.2672

Number of Heat Transfer Units Formula Elements

Variables

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.

Symbol: NTU

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Number of Heat Transfer Units

Overall Heat Transfer Coefficient

The Overall Heat Transfer Coefficient is a measure of the overall ability of a series of conductive and convective barriers to transfer heat.

Symbol: U

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value should be greater than 0.

Formulas to find Overall Heat Transfer Coefficient

Area of Heat Exchanger

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.

Symbol: A

Measurement: AreaUnit: m²

Note: Value should be greater than 0.

Formulas to find Area of Heat Exchanger

Minimum Capacity Rate

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.

Symbol: C_min

Measurement: Heat Capacity RateUnit: W/K

Note: Value should be greater than 0.

Formulas to find Minimum Capacity Rate

Other formulas in Heat Exchanger category

Go Capacity Rate

C = ṁ \cdot c

Go Fouling Factor

R f = (\frac{1}{U d}) - (\frac{1}{U})

Go Heat Transfer in Heat Exchanger given Cold Fluid Properties

Q = mod \underset{̲}{u} s (m c \cdot c c \cdot (T ci - T co))

Go Heat Transfer in Heat Exchanger given Hot Fluid Properties

Q = m h \cdot c h \cdot (T hi - T ho)

How to Evaluate Number of Heat Transfer Units?

Number of Heat Transfer Units evaluator uses Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate to evaluate 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 evaluate Number of Heat Transfer Units using this online evaluator? To use this online evaluator 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.

FAQs on Number of Heat Transfer Units

What is the formula to find Number of Heat Transfer Units?

The formula of Number of Heat Transfer Units is expressed as Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate. Here is an example- 0.2672 = (40*6.68)/1000.

How to calculate Number of Heat Transfer Units?

With Overall Heat Transfer Coefficient (U), Area of Heat Exchanger (A) & Minimum Capacity Rate (C_min) we can find Number of Heat Transfer Units using the formula - Number of Heat Transfer Units = (Overall Heat Transfer Coefficient*Area of Heat Exchanger)/Minimum Capacity Rate.

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Number of Heat Transfer Units Formula

Number of Heat Transfer Units Example

Number of Heat Transfer Units Solution

Number of Heat Transfer Units Formula Elements

Other formulas in Heat Exchanger category

How to Evaluate Number of Heat Transfer Units?

FAQs on Number of Heat Transfer Units

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