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Overall heat transfer coefficient Formula

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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. Check FAQs

U overall = \frac{Q}{A \cdot ΔT m}

U_overall - Overall Heat Transfer Coefficient?Q - Heat Flow Rate?A - Area?ΔT_m - Logarithmic Mean Temperature Difference?

Overall heat transfer coefficient Example

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Here is how the Overall heat transfer coefficient equation looks like with Values.

Here is how the Overall heat transfer coefficient equation looks like with Units.

Here is how the Overall heat transfer coefficient equation looks like.

0.0833 = \frac{125}{50 \cdot 30}

0.0833W/m²*K = \frac{125W}{50m² \cdot 30}

0.0833 = \frac{125}{50 \cdot 30}

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Overall heat transfer coefficient Solution

Follow our step by step solution on how to calculate Overall heat transfer coefficient?

FIRST Step Consider the formula

U overall = \frac{Q}{A \cdot ΔT m}

Next Step Substitute values of Variables

∴

U overall = \frac{125W}{50m² \cdot 30}

Next Step Prepare to Evaluate

∴

U overall = \frac{125}{50 \cdot 30}

Next Step Evaluate

∴

U overall = 0.0833333333333333W/m²*K

LAST Step Rounding Answer

∴

U overall = 0.0833W/m²*K

Overall heat transfer coefficient Formula Elements

Variables

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_overall

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value should be greater than 0.

Formulas to find Overall Heat Transfer Coefficient

Heat Flow Rate

Heat Flow Rate is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium.

Symbol: Q

Measurement: PowerUnit: W

Note: Value can be positive or negative.

Formulas to find Heat Flow Rate

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

Logarithmic Mean Temperature Difference

Logarithmic Mean Temperature Difference is the log of the mean of the temperature values.

Symbol: ΔT_m

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Logarithmic Mean Temperature Difference

Other formulas in Heat Transfer Through Fin category

Go Reynolds number in heat exchanger

Re = \frac{Δm \cdot De}{μ}

Go Mass flux of fluid in transverse fin heat exchanger

Δm = \frac{R e \cdot μ}{De}

Go Heat flow required

Q = A \cdot U overall \cdot ΔT m

Go Logarithmic mean of temperature difference

ΔT m = \frac{Q}{A \cdot U overall}

How to Evaluate Overall heat transfer coefficient?

Overall heat transfer coefficient evaluator uses Overall Heat Transfer Coefficient = Heat Flow Rate/(Area*Logarithmic Mean Temperature Difference) to evaluate the Overall Heat Transfer Coefficient, Overall heat transfer coefficient formula is defined as a measure of the efficiency of heat transfer through a system, considering the heat transfer rate, surface area, and the temperature difference across the system. Overall Heat Transfer Coefficient is denoted by U_overall symbol.

How to evaluate Overall heat transfer coefficient using this online evaluator? To use this online evaluator for Overall heat transfer coefficient, enter Heat Flow Rate (Q), Area (A) & Logarithmic Mean Temperature Difference (ΔT_m) and hit the calculate button.

FAQs on Overall heat transfer coefficient

What is the formula to find Overall heat transfer coefficient?

The formula of Overall heat transfer coefficient is expressed as Overall Heat Transfer Coefficient = Heat Flow Rate/(Area*Logarithmic Mean Temperature Difference). Here is an example- 0.083333 = 125/(50*30).

How to calculate Overall heat transfer coefficient?

With Heat Flow Rate (Q), Area (A) & Logarithmic Mean Temperature Difference (ΔT_m) we can find Overall heat transfer coefficient using the formula - Overall Heat Transfer Coefficient = Heat Flow Rate/(Area*Logarithmic Mean Temperature Difference).

Can the Overall heat transfer coefficient be negative?

No, the Overall heat transfer coefficient, measured in Heat Transfer Coefficient cannot be negative.

Which unit is used to measure Overall heat transfer coefficient?

Overall heat transfer coefficient is usually measured using the Watt per Square Meter per Kelvin[W/m²*K] for Heat Transfer Coefficient. Watt per Square Meter per Celcius[W/m²*K], Joule per Second per Square Meter per Kelvin[W/m²*K], Kilocalorie (IT) per Hour per Square Foot per Celcius[W/m²*K] are the few other units in which Overall heat transfer coefficient can be measured.

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