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Local Heat Transfer Resistance of Air-Film Formula

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Local Heat Transfer Resistance is the ratio of the temperature difference, dT, to the heat transfer Q. This is analogous to Ohm's law. Check FAQs

HT Resistance = \frac{1}{h ht \cdot A}

HT_Resistance - Local Heat Transfer Resistance?h_ht - Heat Transfer Coefficient?A - Area?

Local Heat Transfer Resistance of Air-Film Example

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Here is how the Local Heat Transfer Resistance of Air-Film equation looks like with Values.

Here is how the Local Heat Transfer Resistance of Air-Film equation looks like with Units.

Here is how the Local Heat Transfer Resistance of Air-Film equation looks like.

13.3333 = \frac{1}{1.5 \cdot 0.05}

13.3333K/W = \frac{1}{1.5W/m²*K \cdot 0.05m²}

13.3333 = \frac{1}{1.5 \cdot 0.05}

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Local Heat Transfer Resistance of Air-Film Solution

Follow our step by step solution on how to calculate Local Heat Transfer Resistance of Air-Film?

FIRST Step Consider the formula

HT Resistance = \frac{1}{h ht \cdot A}

Next Step Substitute values of Variables

∴

HT Resistance = \frac{1}{1.5W/m²*K \cdot 0.05m²}

Next Step Prepare to Evaluate

∴

HT Resistance = \frac{1}{1.5 \cdot 0.05}

Next Step Evaluate

∴

HT Resistance = 13.3333333333333K/W

LAST Step Rounding Answer

∴

HT Resistance = 13.3333K/W

Local Heat Transfer Resistance of Air-Film Formula Elements

Variables

Local Heat Transfer Resistance

Local Heat Transfer Resistance is the ratio of the temperature difference, dT, to the heat transfer Q. This is analogous to Ohm's law.

Symbol: HT_Resistance

Measurement: Thermal ResistanceUnit: K/W

Note: Value should be greater than 0.

Formulas to find Local Heat Transfer Resistance

Heat Transfer Coefficient

The Heat Transfer Coefficient is the heat transferred per unit area per kelvin. Thus area is included in the equation as it represents the area over which the transfer of heat takes place.

Symbol: h_ht

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Heat Transfer Coefficient

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

Other formulas in Basics of Heat Transfer category

Go Log Mean Temperature Difference for CoCurrent Flow

LMTD = \frac{(T ho - T co) - (T hi - T ci)}{\ln (\frac{T ho - T co}{T hi - T ci})}

Go Log Mean Temperature Difference for Counter Current Flow

LMTD = \frac{(T ho - T ci) - (T hi - T co)}{\ln (\frac{T ho - T ci}{T hi - T co})}

Go Logarithmic Mean Area of Cylinder

A mean = \frac{A o - A i}{\ln (\frac{A o}{A i})}

Go Heat Transfer Coefficient based on Temperature Difference

h ht = \frac{q}{ΔT Overall}

How to Evaluate Local Heat Transfer Resistance of Air-Film?

Local Heat Transfer Resistance of Air-Film evaluator uses Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area) to evaluate the Local Heat Transfer Resistance, The Local Heat Transfer Resistance of Air-film formula is defined as the ratio of the temperature difference, dT to the heat transfer Q. This is analogous to Ohm's law, in which the electrical resistance is defined as the ratio of the voltage drop across a resistor to the current flow across the resistor. Local Heat Transfer Resistance is denoted by HT_Resistance symbol.

How to evaluate Local Heat Transfer Resistance of Air-Film using this online evaluator? To use this online evaluator for Local Heat Transfer Resistance of Air-Film, enter Heat Transfer Coefficient (h_ht) & Area (A) and hit the calculate button.

FAQs on Local Heat Transfer Resistance of Air-Film

What is the formula to find Local Heat Transfer Resistance of Air-Film?

The formula of Local Heat Transfer Resistance of Air-Film is expressed as Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area). Here is an example- 13.33333 = 1/(1.5*0.05).

How to calculate Local Heat Transfer Resistance of Air-Film?

With Heat Transfer Coefficient (h_ht) & Area (A) we can find Local Heat Transfer Resistance of Air-Film using the formula - Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area).

Can the Local Heat Transfer Resistance of Air-Film be negative?

No, the Local Heat Transfer Resistance of Air-Film, measured in Thermal Resistance cannot be negative.

Which unit is used to measure Local Heat Transfer Resistance of Air-Film?

Local Heat Transfer Resistance of Air-Film is usually measured using the Kelvin per Watt[K/W] for Thermal Resistance. Degree Fahrenheit hour per Btu (IT)[K/W], Degree Fahrenheit Hour per Btu (th)[K/W], Kelvin per Milliwatt[K/W] are the few other units in which Local Heat Transfer Resistance of Air-Film can be measured.

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