Thermal Resistance in Convection Heat Transfer Solution

STEP 0: Pre-Calculation Summary
Formula Used
Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer)
Rth = 1/(Aexpo*hconv)
This formula uses 3 Variables
Variables Used
Thermal Resistance - (Measured in Kelvin per Watt) - Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow.
Exposed Surface Area - (Measured in Square Meter) - Exposed Surface Area is defined as the area that is exposed to the heat flow.
Co-efficient of Convective Heat Transfer - (Measured in Watt per Square Meter per Kelvin) - Co-efficient of Convective Heat Transfer may be defined as the amount of heat transmitted for a unit temperature difference between surrounding fluid and unit area of surface in unit time.
STEP 1: Convert Input(s) to Base Unit
Exposed Surface Area: 11.1 Square Meter --> 11.1 Square Meter No Conversion Required
Co-efficient of Convective Heat Transfer: 20 Watt per Square Meter per Kelvin --> 20 Watt per Square Meter per Kelvin No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Rth = 1/(Aexpo*hconv) --> 1/(11.1*20)
Evaluating ... ...
Rth = 0.0045045045045045
STEP 3: Convert Result to Output's Unit
0.0045045045045045 Kelvin per Watt --> No Conversion Required
FINAL ANSWER
0.0045045045045045 0.004505 Kelvin per Watt <-- Thermal Resistance
(Calculation completed in 00.004 seconds)

Credits

Created by Kethavath Srinath
Osmania University (OU), Hyderabad
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13 Heat and Mass Transfer Calculators

Heat Transfer by Conduction at Base
Go Rate of Conductive Heat Transfer = (Thermal Conductivity*Cross Sectional Area of Fin*Perimeter of the Fin*Convective Heat Transfer Coefficient)^0.5*(Base Temperature-Ambient Temperature)
Heat Exchange by Radiation due to Geometric Arrangement
Go Heat Transfer = Emissivity*Area*[Stefan-BoltZ]*Shape Factor*(Temperature of Surface 1^(4)-Temperature of Surface 2^(4))
Black Bodies Heat Exchange by Radiation
Go Heat Transfer = Emissivity*[Stefan-BoltZ]*Area*(Temperature of Surface 1^(4)-Temperature of Surface 2^(4))
Heat Transfer According to Fourier's Law
Go Heat Flow Through a Body = -(Thermal Conductivity of Material*Surface Area of Heat Flow*Temperature Difference/Thickness)
One Dimensional Heat Flux
Go Heat Flux = -Thermal Conductivity of Fin/Wall Thickness*(Temperature of Wall 2-Temperature of Wall 1)
Newton's Law of Cooling
Go Heat Flux = Heat Transfer Coefficient*(Surface Temperature-Temperature of Characteristic Fluid)
Non Ideal Body Surface Emittance
Go Real Surface Radiant Surface Emittance = Emissivity*[Stefan-BoltZ]*Surface Temperature^(4)
Convective Processes Heat Transfer Coefficient
Go Heat Flux = Heat Transfer Coefficient*(Surface Temperature-Recovery temperature)
Thermal Conductivity given Critical Thickness of Insulation for Cylinder
Go Thermal Conductivity of Fin = Critical Thickness of Insulation*Heat Transfer Coefficient at Outer Surface
Diameter of Rod Circular Fin given Area of Cross-Section
Go Diameter of Circular Rod = sqrt((Cross-sectional area*4)/pi)
Critical Thickness of Insulation for Cylinder
Go Critical Thickness of Insulation = Thermal Conductivity of Fin/Heat Transfer Coefficient
Thermal Resistance in Convection Heat Transfer
Go Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer)
Heat Transfer
Go Heat Flow Rate = Thermal Potential Difference/Thermal Resistance

13 Basics of Modes of Heat Transfer Calculators

Thermal Resistance of Spherical Wall
Go Thermal Resistance of Sphere Without Convection = (Radius of 2nd Concentric Sphere-Radius of 1st Concentric Sphere)/(4*pi*Thermal Conductivity*Radius of 1st Concentric Sphere*Radius of 2nd Concentric Sphere)
Radiation Thermal Resistance
Go Thermal Resistance = 1/(Emissivity*[Stefan-BoltZ]*Base Area*(Temperature of Surface 1+Temperature of Surface 2)*(((Temperature of Surface 1)^2)+((Temperature of Surface 2)^2)))
Radial Heat Flowing through Cylinder
Go Heat = Thermal Conductivity*2*pi*Temperature Difference*Length of Cylinder/(ln(Outer Radius of Cylinder/Inner Radius of Cylinder))
Heat Transfer through Plane Wall or Surface
Go Heat Flow Rate = -Thermal Conductivity*Cross Sectional Area*(Outside Temperature-Inside Temperature)/Width of Plane Surface
Radiative Heat Transfer
Go Heat = [Stefan-BoltZ]*Body Surface Area*Geometric View Factor*(Temperature of Surface 1^4-Temperature of Surface 2^4)
Rate of Convective Heat Transfer
Go Heat Flow Rate = Heat Transfer Coefficient*Exposed Surface Area*(Surface Temperature-Ambient Air Temperature)
Total Emissive Power of Radiating Body
Go Emissive Power per Unit Area = (Emissivity*(Effective Radiating Temperature)^4)*[Stefan-BoltZ]
Thermal Diffusivity
Go Thermal Diffusivity = Thermal Conductivity/(Density*Specific Heat Capacity)
Radiosity
Go Radiosity = Energy Leaving Surface/(Body Surface Area*Time in seconds)
Thermal Resistance in Convection Heat Transfer
Go Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer)
Overall Heat Transfer based on Thermal Resistance
Go Overall Heat Transfer = Overall Temperature Difference/Total Thermal Resistance
Temperature Difference using Thermal Analogy to Ohm's Law
Go Temperature Difference = Heat Flow Rate*Thermal Resistance
Ohm's Law
Go Voltage = Electric Current*Resistance

13 Conduction, Convection and Radiation Calculators

Heat Transfer by Conduction at Base
Go Rate of Conductive Heat Transfer = (Thermal Conductivity*Cross Sectional Area of Fin*Perimeter of the Fin*Convective Heat Transfer Coefficient)^0.5*(Base Temperature-Ambient Temperature)
Heat Exchange by Radiation due to Geometric Arrangement
Go Heat Transfer = Emissivity*Area*[Stefan-BoltZ]*Shape Factor*(Temperature of Surface 1^(4)-Temperature of Surface 2^(4))
Black Bodies Heat Exchange by Radiation
Go Heat Transfer = Emissivity*[Stefan-BoltZ]*Area*(Temperature of Surface 1^(4)-Temperature of Surface 2^(4))
Heat Transfer According to Fourier's Law
Go Heat Flow Through a Body = -(Thermal Conductivity of Material*Surface Area of Heat Flow*Temperature Difference/Thickness)
One Dimensional Heat Flux
Go Heat Flux = -Thermal Conductivity of Fin/Wall Thickness*(Temperature of Wall 2-Temperature of Wall 1)
Newton's Law of Cooling
Go Heat Flux = Heat Transfer Coefficient*(Surface Temperature-Temperature of Characteristic Fluid)
Non Ideal Body Surface Emittance
Go Real Surface Radiant Surface Emittance = Emissivity*[Stefan-BoltZ]*Surface Temperature^(4)
Thermal Resistance in Conduction
Go Thermal Resistance = (Thickness)/(Thermal Conductivity of Fin*Cross Sectional Area)
Convective Processes Heat Transfer Coefficient
Go Heat Flux = Heat Transfer Coefficient*(Surface Temperature-Recovery temperature)
Thermal Conductivity given Critical Thickness of Insulation for Cylinder
Go Thermal Conductivity of Fin = Critical Thickness of Insulation*Heat Transfer Coefficient at Outer Surface
Critical Thickness of Insulation for Cylinder
Go Critical Thickness of Insulation = Thermal Conductivity of Fin/Heat Transfer Coefficient
Thermal Resistance in Convection Heat Transfer
Go Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer)
Heat Transfer
Go Heat Flow Rate = Thermal Potential Difference/Thermal Resistance

Thermal Resistance in Convection Heat Transfer Formula

Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer)
Rth = 1/(Aexpo*hconv)

what is convection heat transfer?

Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids. Convection is usually the dominant form of heat transfer in liquids and gases. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of unknown conduction (heat diffusion) and advection (heat transfer by bulk fluid flow).

How to Calculate Thermal Resistance in Convection Heat Transfer?

Thermal Resistance in Convection Heat Transfer calculator uses Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer) to calculate the Thermal Resistance, Thermal resistance in convection heat transfer is defined as the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area. Thermal Resistance is denoted by Rth symbol.

How to calculate Thermal Resistance in Convection Heat Transfer using this online calculator? To use this online calculator for Thermal Resistance in Convection Heat Transfer, enter Exposed Surface Area (Aexpo) & Co-efficient of Convective Heat Transfer (hconv) and hit the calculate button. Here is how the Thermal Resistance in Convection Heat Transfer calculation can be explained with given input values -> 0.006825 = 1/(11.1*20).

FAQ

What is Thermal Resistance in Convection Heat Transfer?
Thermal resistance in convection heat transfer is defined as the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area and is represented as Rth = 1/(Aexpo*hconv) or Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer). Exposed Surface Area is defined as the area that is exposed to the heat flow & Co-efficient of Convective Heat Transfer may be defined as the amount of heat transmitted for a unit temperature difference between surrounding fluid and unit area of surface in unit time.
How to calculate Thermal Resistance in Convection Heat Transfer?
Thermal resistance in convection heat transfer is defined as the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area is calculated using Thermal Resistance = 1/(Exposed Surface Area*Co-efficient of Convective Heat Transfer). To calculate Thermal Resistance in Convection Heat Transfer, you need Exposed Surface Area (Aexpo) & Co-efficient of Convective Heat Transfer (hconv). With our tool, you need to enter the respective value for Exposed Surface Area & Co-efficient of Convective Heat Transfer and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Thermal Resistance?
In this formula, Thermal Resistance uses Exposed Surface Area & Co-efficient of Convective Heat Transfer. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Thermal Resistance = 1/(Emissivity*[Stefan-BoltZ]*Base Area*(Temperature of Surface 1+Temperature of Surface 2)*(((Temperature of Surface 1)^2)+((Temperature of Surface 2)^2)))
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