Direct Diffuse Radiation from Surface 2 to Surface 1 Solution

STEP 0: Pre-Calculation Summary
Formula Used
Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body
q2->1 = A2*F21*J2
This formula uses 4 Variables
Variables Used
Heat Transfer from Surface 2 to 1 - (Measured in Watt) - Heat Transfer from Surface 2 to 1 is the amount of heat that is transferred per unit of time in some material, usually measured in watts (joules per second).
Surface Area of Body 2 - (Measured in Square Meter) - The Surface Area of Body 2 is the area of body 2 upon which the radiation takes place.
Radiation Shape Factor 21 - Radiation Shape Factor 21 is the fraction of radiation energy radiated by one surface which is incident on another surface when both surfaces are placed in a non-absorbing medium.
Radiosity of 2nd Body - (Measured in Watt per Square Meter) - Radiosity of 2nd Body represents the rate at which radiation energy leaves a unit area of a surface in all directions.
STEP 1: Convert Input(s) to Base Unit
Surface Area of Body 2: 50 Square Meter --> 50 Square Meter No Conversion Required
Radiation Shape Factor 21: 0.41 --> No Conversion Required
Radiosity of 2nd Body: 49 Watt per Square Meter --> 49 Watt per Square Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
q2->1 = A2*F21*J2 --> 50*0.41*49
Evaluating ... ...
q2->1 = 1004.5
STEP 3: Convert Result to Output's Unit
1004.5 Watt --> No Conversion Required
FINAL ANSWER
1004.5 Watt <-- Heat Transfer from Surface 2 to 1
(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

Direct Diffuse Radiation from Surface 2 to Surface 1 Formula

Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body
q2->1 = A2*F21*J2

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 Direct Diffuse Radiation from Surface 2 to Surface 1?

Direct Diffuse Radiation from Surface 2 to Surface 1 calculator uses Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body to calculate the Heat Transfer from Surface 2 to 1, The Direct Diffuse Radiation from Surface 2 to Surface 1 formula is defined as the function of Surface area, shape factor and radiosity. Direct radiation has a definite direction but diffuse radiation follows a much more scattered, uncertain path. Because when the radiation is direct, the rays are all travelling in the same direction, an object can block them all at once. Therefore, it can be noted that shadows are only produced when direct radiation is blocked. Heat Transfer from Surface 2 to 1 is denoted by q2->1 symbol.

How to calculate Direct Diffuse Radiation from Surface 2 to Surface 1 using this online calculator? To use this online calculator for Direct Diffuse Radiation from Surface 2 to Surface 1, enter Surface Area of Body 2 (A2), Radiation Shape Factor 21 (F21) & Radiosity of 2nd Body (J2) and hit the calculate button. Here is how the Direct Diffuse Radiation from Surface 2 to Surface 1 calculation can be explained with given input values -> 1004.5 = 50*0.41*49.

FAQ

What is Direct Diffuse Radiation from Surface 2 to Surface 1?
The Direct Diffuse Radiation from Surface 2 to Surface 1 formula is defined as the function of Surface area, shape factor and radiosity. Direct radiation has a definite direction but diffuse radiation follows a much more scattered, uncertain path. Because when the radiation is direct, the rays are all travelling in the same direction, an object can block them all at once. Therefore, it can be noted that shadows are only produced when direct radiation is blocked and is represented as q2->1 = A2*F21*J2 or Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body. The Surface Area of Body 2 is the area of body 2 upon which the radiation takes place, Radiation Shape Factor 21 is the fraction of radiation energy radiated by one surface which is incident on another surface when both surfaces are placed in a non-absorbing medium & Radiosity of 2nd Body represents the rate at which radiation energy leaves a unit area of a surface in all directions.
How to calculate Direct Diffuse Radiation from Surface 2 to Surface 1?
The Direct Diffuse Radiation from Surface 2 to Surface 1 formula is defined as the function of Surface area, shape factor and radiosity. Direct radiation has a definite direction but diffuse radiation follows a much more scattered, uncertain path. Because when the radiation is direct, the rays are all travelling in the same direction, an object can block them all at once. Therefore, it can be noted that shadows are only produced when direct radiation is blocked is calculated using Heat Transfer from Surface 2 to 1 = Surface Area of Body 2*Radiation Shape Factor 21*Radiosity of 2nd Body. To calculate Direct Diffuse Radiation from Surface 2 to Surface 1, you need Surface Area of Body 2 (A2), Radiation Shape Factor 21 (F21) & Radiosity of 2nd Body (J2). With our tool, you need to enter the respective value for Surface Area of Body 2, Radiation Shape Factor 21 & Radiosity of 2nd Body 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 from Surface 2 to 1?
In this formula, Heat Transfer from Surface 2 to 1 uses Surface Area of Body 2, Radiation Shape Factor 21 & Radiosity of 2nd Body. We can use 2 other way(s) to calculate the same, which is/are as follows -
  • 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)
  • 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)
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