Local Heat Transfer Resistance of Air-Film Solution

STEP 0: Pre-Calculation Summary
Formula Used
Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area)
HTResistance = 1/(hht*A)
This formula uses 3 Variables
Variables Used
Local Heat Transfer Resistance - (Measured in Kelvin per Watt) - Local Heat Transfer Resistance is the ratio of the temperature difference, dT, to the heat transfer Q. This is analogous to Ohm's law.
Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - 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.
Area - (Measured in Square Meter) - The area is the amount of two-dimensional space taken up by an object.
STEP 1: Convert Input(s) to Base Unit
Heat Transfer Coefficient: 1.5 Watt per Square Meter per Kelvin --> 1.5 Watt per Square Meter per Kelvin No Conversion Required
Area: 0.05 Square Meter --> 0.05 Square Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
HTResistance = 1/(hht*A) --> 1/(1.5*0.05)
Evaluating ... ...
HTResistance = 13.3333333333333
STEP 3: Convert Result to Output's Unit
13.3333333333333 Kelvin per Watt --> No Conversion Required
FINAL ANSWER
13.3333333333333 13.33333 Kelvin per Watt <-- Local Heat Transfer Resistance
(Calculation completed in 00.020 seconds)

Credits

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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17 Basics of Heat Transfer Calculators

Log Mean Temperature Difference for Counter Current Flow
Go Log Mean Temperature Difference = ((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))
Log Mean Temperature Difference for CoCurrent Flow
Go Log Mean Temperature Difference = ((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))
Logarithmic Mean Area of Cylinder
Go Logarithmic Mean Area = (Outer Area of Cylinder-Inner Area of Cylinder)/ln(Outer Area of Cylinder/Inner Area of Cylinder)
Equivalent Diameter when Flow in Rectangular Duct
Go Equivalent Diameter = (4*Length of Rectangular Section*Breadth of Rectangle)/(2*(Length of Rectangular Section+Breadth of Rectangle))
Internal Diameter of Pipe given Heat Transfer Coefficient for Gas in Turbulent Motion
Go Internal Diameter of Pipe = ((16.6*Specific Heat Capacity*(Mass Velocity)^0.8)/(Heat Transfer Coefficient for Gas))^(1/0.2)
Heat Transfer from Stream of Gas flowing in Turbulent Motion
Go Heat Transfer Coefficient = (16.6*Specific Heat Capacity*(Mass Velocity)^0.8)/(Internal Diameter of Pipe^0.2)
Colburn Factor using Chilton Colburn Analogy
Go Colburn's j-factor = Nusselt Number/((Reynolds Number)*(Prandtl Number)^(1/3))
Heat Transfer Coefficient based on Temperature Difference
Go Heat Transfer Coefficient = Heat Transfer/Overall Temperature Difference
Equivalent Diameter of Non-Circular Duct
Go Equivalent Diameter = (4*Cross Sectional Area of Flow)/Wetted Perimeter
Heat Transfer Coefficient given Local Heat Transfer Resistance of Air Film
Go Heat Transfer Coefficient = 1/((Area)*Local Heat Transfer Resistance)
Local Heat Transfer Resistance of Air-Film
Go Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area)
Wetted Perimeter given Hydraulic Radius
Go Wetted Perimeter = Cross Sectional Area of Flow/Hydraulic Radius
Hydraulic Radius
Go Hydraulic Radius = Cross Sectional Area of Flow/Wetted Perimeter
Reynolds Number given Colburn Factor
Go Reynolds Number = (Colburn's j-factor/0.023)^((-1)/0.2)
J-Factor for Pipe Flow
Go Colburn's j-factor = 0.023*(Reynolds Number)^(-0.2)
Colburn J-Factor given Fanning Friction Factor
Go Colburn's j-factor = Fanning Friction Factor/2
Fanning Friction Factor given Colburn J-Factor
Go Fanning Friction Factor = 2*Colburn's j-factor

Local Heat Transfer Resistance of Air-Film Formula

Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area)
HTResistance = 1/(hht*A)

What is Heat Transfer?

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.

Define Thermal Conductivity & Factors affecting it?

Thermal conductivity is defined as the ability of a substance to conduct heat. Factors Affecting The Thermal Conductivity are: Moisture, Density of material, Pressure, Temperature & Structure of material.

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

Local Heat Transfer Resistance of Air-Film calculator uses Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area) to calculate 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 HTResistance symbol.

How to calculate Local Heat Transfer Resistance of Air-Film using this online calculator? To use this online calculator for Local Heat Transfer Resistance of Air-Film, enter Heat Transfer Coefficient (hht) & Area (A) and hit the calculate button. Here is how the Local Heat Transfer Resistance of Air-Film calculation can be explained with given input values -> 13.33333 = 1/(1.5*0.05).

FAQ

What is Local Heat Transfer Resistance of Air-Film?
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 and is represented as HTResistance = 1/(hht*A) or Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area). 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 & The area is the amount of two-dimensional space taken up by an object.
How to calculate Local Heat Transfer Resistance of Air-Film?
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 is calculated using Local Heat Transfer Resistance = 1/(Heat Transfer Coefficient*Area). To calculate Local Heat Transfer Resistance of Air-Film, you need Heat Transfer Coefficient (hht) & Area (A). With our tool, you need to enter the respective value for Heat Transfer Coefficient & Area 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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