Net Heat Lost by Surface Solution

STEP 0: Pre-Calculation Summary
Formula Used
Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation))
q = A*((ε*Eb)-(α*G))
This formula uses 6 Variables
Variables Used
Heat Transfer - (Measured in Watt) - Heat Transfer is the amount of heat that is transferred per unit of time in some material, usually measured in watts (joules per second).
Area - (Measured in Square Meter) - The area is the amount of two-dimensional space taken up by an object.
Emissivity - Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.
Emissive Power of Blackbody - (Measured in Watt per Square Meter) - Emissive Power of Blackbody is the energy of thermal radiation emitted in all directions per unit time from each unit area of a surface of blackbody at any given temperature.
Absorptivity - Absorptivity is the fraction of incident radiation flux absorbed by the body.
Irradiation - (Measured in Watt per Square Meter) - Irradiation is the radiation flux incident on a surface from all directions.
STEP 1: Convert Input(s) to Base Unit
Area: 50.3 Square Meter --> 50.3 Square Meter No Conversion Required
Emissivity: 0.95 --> No Conversion Required
Emissive Power of Blackbody: 700 Watt per Square Meter --> 700 Watt per Square Meter No Conversion Required
Absorptivity: 0.64 --> No Conversion Required
Irradiation: 0.8 Watt per Square Meter --> 0.8 Watt per Square Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
q = A*((ε*Eb)-(α*G)) --> 50.3*((0.95*700)-(0.64*0.8))
Evaluating ... ...
q = 33423.7464
STEP 3: Convert Result to Output's Unit
33423.7464 Watt --> No Conversion Required
FINAL ANSWER
33423.7464 33423.75 Watt <-- Heat Transfer
(Calculation completed in 00.004 seconds)

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University School of Chemical Technology-USCT (GGSIPU), New Delhi
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8 Radiation Exchange with Specular Surfaces Calculators

Net Heat Lost by Surface given Diffuse Radiosity
Go Heat Transfer = ((Emissivity*Area)/(Diffuse Component of Reflectivity))*((Emissive Power of Blackbody*(Emissivity+Diffuse Component of Reflectivity))-Diffuse Radiosity)
Diffuse Radiation Exchange from Surface 1 to Surface 2
Go Heat Transfer from Surface 1 to 2 = (Diffuse Radiosity for Surface 1*Surface Area of Body 1*Radiation Shape Factor 12)*(1-Specular Component of Reflectivity of Surface 2)
Diffuse Radiation Exchange from Surface 2 to Surface 1
Go Heat Transfer from Surface 2 to 1 = Diffuse Radiosity for Surface 2*Surface Area of Body 2*Radiation Shape Factor 21*(1-Specular Component of Reflectivity of Surface 1)
Net Heat Lost by Surface
Go Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation))
Diffuse Radiosity
Go Diffuse Radiosity = ((Emissivity*Emissive Power of Blackbody)+(Diffuse Component of Reflectivity*Irradiation))
Direct Diffuse Radiation from Surface 2 to Surface 1
Go Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body
Transmissivity given Specular and Diffuse Component
Go Transmissivity = (Specular Component of Transmissivity +Diffuse Component of Transmissivity)
Reflectivity given Specular and Diffuse Component
Go Reflectivity = Specular Component of Reflectivity+Diffuse Component of Reflectivity

21 Important Formulas in Gas Radiation, Radiation Exchange with Specular Surfaces & more Special Cases Calculators

Net Heat Lost by Surface given Diffuse Radiosity
Go Heat Transfer = ((Emissivity*Area)/(Diffuse Component of Reflectivity))*((Emissive Power of Blackbody*(Emissivity+Diffuse Component of Reflectivity))-Diffuse Radiosity)
Transmissivity of Transparent Medium given Radiosity and Shape Factor
Go Transmissivity of Transparent Medium = Radiation Heat Transfer/(Surface Area of Body 1*Radiation Shape Factor 12*(Radiosity of 1st Body-Radiosity of 2nd Body))
Net Heat Exchange in Transmission Process
Go Radiation Heat Transfer = Surface Area of Body 1*Radiation Shape Factor 12*Transmissivity of Transparent Medium*(Radiosity of 1st Body-Radiosity of 2nd Body)
Diffuse Radiation Exchange from Surface 1 to Surface 2
Go Heat Transfer from Surface 1 to 2 = (Diffuse Radiosity for Surface 1*Surface Area of Body 1*Radiation Shape Factor 12)*(1-Specular Component of Reflectivity of Surface 2)
Diffuse Radiation Exchange from Surface 2 to Surface 1
Go Heat Transfer from Surface 2 to 1 = Diffuse Radiosity for Surface 2*Surface Area of Body 2*Radiation Shape Factor 21*(1-Specular Component of Reflectivity of Surface 1)
Energy Leaving Surface 1 that is Transmitted through Medium
Go Energy Leaving Surface = Radiosity of 1st Body*Surface Area of Body 1*Radiation Shape Factor 12*Transmissivity of Transparent Medium
Net Heat Lost by Surface
Go Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation))
Radiation Intensity at given Distance using Beer's Law
Go Radiation Intensity at Distance x = Initial Radiation Intensity*exp(-(Monochromatic Absorption Coefficient*Distance))
Initial Radiation Intensity
Go Initial Radiation Intensity = Radiation Intensity at Distance x/exp(-(Monochromatic Absorption Coefficient*Distance))
Diffuse Radiosity
Go Diffuse Radiosity = ((Emissivity*Emissive Power of Blackbody)+(Diffuse Component of Reflectivity*Irradiation))
Direct Diffuse Radiation from Surface 2 to Surface 1
Go Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body
Monochromatic Transmissivity
Go Monochromatic Transmissivity = exp(-(Monochromatic Absorption Coefficient*Distance))
Emissive Power of Blackbody through Medium given Emissivity of Medium
Go Emissive Power of Blackbody through Medium = Radiosity for Transparent Medium/Emissivity of Medium
Emissivity of Medium given Emissive Power of Blackbody through Medium
Go Emissivity of Medium = Radiosity for Transparent Medium/Emissive Power of Blackbody through Medium
Energy Emitted by Medium
Go Radiosity for Transparent Medium = Emissivity of Medium*Emissive Power of Blackbody through Medium
Transmissivity given Specular and Diffuse Component
Go Transmissivity = (Specular Component of Transmissivity +Diffuse Component of Transmissivity)
Temperature of Medium given Emissive Power of Blackbody
Go Temperature of Medium = (Emissive Power of Blackbody through Medium/[Stefan-BoltZ])^(1/4)
Emissive Power of Blackbody through Medium
Go Emissive Power of Blackbody through Medium = [Stefan-BoltZ]*(Temperature of Medium^4)
Reflectivity given Specular and Diffuse Component
Go Reflectivity = Specular Component of Reflectivity+Diffuse Component of Reflectivity
Monochromatic Absorption Coefficient if Gas is Non-Reflecting
Go Monochromatic Absorption Coefficient = 1-Monochromatic Transmissivity
Monochromatic Transmissivity if Gas is Non Reflecting
Go Monochromatic Transmissivity = 1-Monochromatic Absorption Coefficient

Net Heat Lost by Surface Formula

Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation))
q = A*((ε*Eb)-(α*G))

What is Radiation?

Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.

What is Reflectivity?

A measure of the ability of a surface to reflect radiation, equal to the reflectance of a layer of material sufficiently thick for the reflectance not to depend on the thickness.

How to Calculate Net Heat Lost by Surface?

Net Heat Lost by Surface calculator uses Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation)) to calculate the Heat Transfer, The Net Heat Lost by Surface formula is defined as the function of area of heat transfer, emissivity, emissive power of blackbody, absorptivity and irradiation. Heat loss is the intentional or unintentional movement of heat from one material to another. This can happen through conduction, convection and radiation. Conduction often occurs when an insulated or uninsulated component is in direct contact with another component. Heat Transfer is denoted by q symbol.

How to calculate Net Heat Lost by Surface using this online calculator? To use this online calculator for Net Heat Lost by Surface, enter Area (A), Emissivity (ε), Emissive Power of Blackbody (Eb), Absorptivity (α) & Irradiation (G) and hit the calculate button. Here is how the Net Heat Lost by Surface calculation can be explained with given input values -> 33423.75 = 50.3*((0.95*700)-(0.64*0.8)).

FAQ

What is Net Heat Lost by Surface?
The Net Heat Lost by Surface formula is defined as the function of area of heat transfer, emissivity, emissive power of blackbody, absorptivity and irradiation. Heat loss is the intentional or unintentional movement of heat from one material to another. This can happen through conduction, convection and radiation. Conduction often occurs when an insulated or uninsulated component is in direct contact with another component and is represented as q = A*((ε*Eb)-(α*G)) or Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation)). The area is the amount of two-dimensional space taken up by an object, Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95, Emissive Power of Blackbody is the energy of thermal radiation emitted in all directions per unit time from each unit area of a surface of blackbody at any given temperature, Absorptivity is the fraction of incident radiation flux absorbed by the body & Irradiation is the radiation flux incident on a surface from all directions.
How to calculate Net Heat Lost by Surface?
The Net Heat Lost by Surface formula is defined as the function of area of heat transfer, emissivity, emissive power of blackbody, absorptivity and irradiation. Heat loss is the intentional or unintentional movement of heat from one material to another. This can happen through conduction, convection and radiation. Conduction often occurs when an insulated or uninsulated component is in direct contact with another component is calculated using Heat Transfer = Area*((Emissivity*Emissive Power of Blackbody)-(Absorptivity*Irradiation)). To calculate Net Heat Lost by Surface, you need Area (A), Emissivity (ε), Emissive Power of Blackbody (Eb), Absorptivity (α) & Irradiation (G). With our tool, you need to enter the respective value for Area, Emissivity, Emissive Power of Blackbody, Absorptivity & Irradiation 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 Heat Transfer?
In this formula, Heat Transfer uses Area, Emissivity, Emissive Power of Blackbody, Absorptivity & Irradiation. We can use 2 other way(s) to calculate the same, which is/are as follows -
  • Heat Transfer = ((Emissivity*Area)/(Diffuse Component of Reflectivity))*((Emissive Power of Blackbody*(Emissivity+Diffuse Component of Reflectivity))-Diffuse Radiosity)
  • Heat Transfer = ((Emissivity*Area)/(Diffuse Component of Reflectivity))*((Emissive Power of Blackbody*(Emissivity+Diffuse Component of Reflectivity))-Diffuse Radiosity)
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