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Heat flow required Formula

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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. Check FAQs

Q = A \cdot U overall \cdot ΔT m

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

Heat flow required Example

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Here is how the Heat flow required equation looks like with Values.

Here is how the Heat flow required equation looks like with Units.

Here is how the Heat flow required equation looks like.

375 = 50 \cdot 0.25 \cdot 30

375W = 50m² \cdot 0.25W/m²*K \cdot 30

375 = 50 \cdot 0.25 \cdot 30

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Heat flow required Solution

Follow our step by step solution on how to calculate Heat flow required?

FIRST Step Consider the formula

Q = A \cdot U overall \cdot ΔT m

Next Step Substitute values of Variables

∴

Q = 50m² \cdot 0.25W/m²*K \cdot 30

Next Step Prepare to Evaluate

∴

Q = 50 \cdot 0.25 \cdot 30

LAST Step Evaluate

∴

Q = 375W

Heat flow required Formula Elements

Variables

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

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

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 Overall heat transfer coefficient

U overall = \frac{Q}{A \cdot ΔT m}

Go Logarithmic mean of temperature difference

ΔT m = \frac{Q}{A \cdot U overall}

How to Evaluate Heat flow required?

Heat flow required evaluator uses Heat Flow Rate = Area*Overall Heat Transfer Coefficient*Logarithmic Mean Temperature Difference to evaluate the Heat Flow Rate, Heat flow required formula is defined as a measure of the thermal energy transfer needed to maintain a desired temperature difference across a surface, considering the overall heat transfer coefficient and the area involved in the process. Heat Flow Rate is denoted by Q symbol.

How to evaluate Heat flow required using this online evaluator? To use this online evaluator for Heat flow required, enter Area (A), Overall Heat Transfer Coefficient (U_overall) & Logarithmic Mean Temperature Difference (ΔT_m) and hit the calculate button.

FAQs on Heat flow required

What is the formula to find Heat flow required?

The formula of Heat flow required is expressed as Heat Flow Rate = Area*Overall Heat Transfer Coefficient*Logarithmic Mean Temperature Difference. Here is an example- 375 = 50*0.25*30.

How to calculate Heat flow required?

With Area (A), Overall Heat Transfer Coefficient (U_overall) & Logarithmic Mean Temperature Difference (ΔT_m) we can find Heat flow required using the formula - Heat Flow Rate = Area*Overall Heat Transfer Coefficient*Logarithmic Mean Temperature Difference.

Can the Heat flow required be negative?

Yes, the Heat flow required, measured in Power can be negative.

Which unit is used to measure Heat flow required?

Heat flow required is usually measured using the Watt[W] for Power. Kilowatt[W], Milliwatt[W], Microwatt[W] are the few other units in which Heat flow required can be measured.

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