✖The Surface Area of Body 2 is the area of body 2 upon which the radiation takes place.ⓘ Surface Area of Body 2 [A₂]			+10% -10%
✖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.ⓘ Radiation Shape Factor 21 [F₂₁]			+10% -10%
✖Emissive Power of 1st 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.ⓘ Emissive Power of 1st Blackbody [E_b1]			+10% -10%
✖Emissive Power of 2nd 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.ⓘ Emissive Power of 2nd Blackbody [E_b2]			+10% -10%

✖Net Heat Transfer is the amount of heat that is transferred per unit of time in some material, usually measured in watts (joules per second).ⓘ Net Heat Exchange given Area 2 and Shape Factor 21 [Q_1-2]

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Formula

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Net Heat Exchange given Area 2 and Shape Factor 21

Formula

`"Q"_{"1-2"} = "A"_{"2"}*"F"_{"21"}*("E"_{"b1"}-"E"_{"b2"})`

Example

`"3177.5W"="50m²"*"0.41"*("680W/m²"-"525W/m²")`

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Net Heat Exchange given Area 2 and Shape Factor 21 Solution

STEP 0: Pre-Calculation Summary

Formula Used

Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)
Q_1-2 = A₂*F₂₁*(E_b1-E_b2)
This formula uses 5 Variables

Variables Used

Net Heat Transfer - (Measured in Watt) - Net Heat Transfer 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.
Emissive Power of 1st Blackbody - (Measured in Watt per Square Meter) - Emissive Power of 1st 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.
Emissive Power of 2nd Blackbody - (Measured in Watt per Square Meter) - Emissive Power of 2nd 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.

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
Emissive Power of 1st Blackbody: 680 Watt per Square Meter --> 680 Watt per Square Meter No Conversion Required
Emissive Power of 2nd Blackbody: 525 Watt per Square Meter --> 525 Watt per Square Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Q_1-2 = A₂*F₂₁*(E_b1-E_b2) --> 50*0.41*(680-525)

Evaluating ... ...

Q_1-2 = 3177.5

STEP 3: Convert Result to Output's Unit

3177.5 Watt --> No Conversion Required

FINAL ANSWER

3177.5 Watt <-- Net Heat Transfer

(Calculation completed in 00.004 seconds)

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< 10+ Radiation Heat Transfer Calculators

Heat Transfer between Concentric Spheres

Go Heat Transfer = (Surface Area of Body 1*[Stefan-BoltZ]*((Temperature of Surface 1^4)-(Temperature of Surface 2^4)))/((1/Emissivity of Body 1)+(((1/Emissivity of Body 2)-1)*((Radius of Smaller Sphere/Radius of Larger Sphere)^2)))

Heat Transfer between Two Long Concentric Cylinder given Temp, Emissivity and Area of Both Surfaces

Go Heat Transfer = (([Stefan-BoltZ]*Surface Area of Body 1*((Temperature of Surface 1^4)-(Temperature of Surface 2^4))))/((1/Emissivity of Body 1)+((Surface Area of Body 1/Surface Area of Body 2)*((1/Emissivity of Body 2)-1)))

Radiation Heat Transfer between Plane 1 and Shield given Temperature and Emissivity of Both Surfaces

Go Heat Transfer = Area*[Stefan-BoltZ]*((Temperature of Plane 1^4)-(Temperature of Radiation Shield^4))/((1/Emissivity of Body 1)+(1/Emissivity of Radiation Shield)-1)

Radiation Heat Transfer between Plane 2 and Radiation Shield given Temperature and Emissivity

Go Heat Transfer = Area*[Stefan-BoltZ]*((Temperature of Radiation Shield^4)-(Temperature of Plane 2^4))/((1/Emissivity of Radiation Shield)+(1/Emissivity of Body 2)-1)

Heat Transfer between Two Infinite Parallel Planes given Temp and Emissivity of Both Surfaces

Go Heat Transfer = (Area*[Stefan-BoltZ]*((Temperature of Surface 1^4)-(Temperature of Surface 2^4)))/((1/Emissivity of Body 1)+(1/Emissivity of Body 2)-1)

Heat Transfer between Small Convex Object in Large Enclosure

Go Heat Transfer = Surface Area of Body 1*Emissivity of Body 1*[Stefan-BoltZ]*((Temperature of Surface 1^4)-(Temperature of Surface 2^4))

Net Heat Exchange given Area 1 and Shape Factor 12

Go Net Heat Transfer = Surface Area of Body 1*Radiation Shape Factor 12*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)

Net Heat Exchange given Area 2 and Shape Factor 21

Go Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)

Net Heat Exchange between Two Surfaces given Radiosity for Both Surface

Go Radiation Heat Transfer = (Radiosity of 1st Body-Radiosity of 2nd Body)/(1/(Surface Area of Body 1*Radiation Shape Factor 12))

Net Heat Transfer from Surface given Emissivity, Radiosity and Emissive Power

Go Heat Transfer = (((Emissivity*Area)*(Emissive Power of Blackbody-Radiosity))/(1-Emissivity))

< 25 Important Formulas in Radiation Heat Transfer Calculators

Heat Transfer between Concentric Spheres

Heat Transfer between Small Convex Object in Large Enclosure

Go Heat Transfer = Surface Area of Body 1*Emissivity of Body 1*[Stefan-BoltZ]*((Temperature of Surface 1^4)-(Temperature of Surface 2^4))

Radiosity given Emissive Power and Irradiation

Go Radiosity = (Emissivity*Emissive Power of Blackbody)+(Reflectivity*Irradiation)

Area of Surface 1 given Area 2 and Radiation Shape Factor for Both Surfaces

Go Surface Area of Body 1 = Surface Area of Body 2*(Radiation Shape Factor 21/Radiation Shape Factor 12)

Area of Surface 2 given Area 1 and Radiation Shape Factor for Both Surfaces

Go Surface Area of Body 2 = Surface Area of Body 1*(Radiation Shape Factor 12/Radiation Shape Factor 21)

Shape Factor 12 given Area of Both Surface and Shape Factor 21

Go Radiation Shape Factor 12 = (Surface Area of Body 2/Surface Area of Body 1)*Radiation Shape Factor 21

Shape Factor 21 given Area of Both Surface and Shape Factor 12

Go Radiation Shape Factor 21 = Radiation Shape Factor 12*(Surface Area of Body 1/Surface Area of Body 2)

Temperature of Radiation Shield Placed between Two Parallel Infinite Planes with Equal Emissivities

Go Temperature of Radiation Shield = (0.5*((Temperature of Plane 1^4)+(Temperature of Plane 2^4)))^(1/4)

Emissive Power of Blackbody

Go Emissive Power of Blackbody = [Stefan-BoltZ]*(Temperature of Blackbody^4)

Net Energy Leaving given Radiosity and Irradiation

Go Heat Transfer = Area*(Radiosity-Irradiation)

Emissive Power of Non Blackbody given Emissivity

Go Emissive Power of Non Blackbody = Emissivity*Emissive Power of Blackbody

Emissivity of Body

Go Emissivity = Emissive Power of Non Blackbody/Emissive Power of Blackbody

Total Resistance in Radiation Heat Transfer given Emissivity and Number of Shields

Go Resistance = (Number of Shields+1)*((2/Emissivity)-1)

Reflected Radiation given Absorptivity and Transmissivity

Go Reflectivity = 1-Absorptivity-Transmissivity

Absorptivity given Reflectivity and Transmissivity

Go Absorptivity = 1-Reflectivity-Transmissivity

Transmissivity Given Reflectivity and Absorptivity

Go Transmissivity = 1-Absorptivity-Reflectivity

Mass of Particle Given Frequency and Speed of Light

Go Mass of Particle = [hP]*Frequency/([c]^2)

Energy of each Quanta

Go Energy of Each Quanta = [hP]*Frequency

Frequency given Speed of Light and Wavelength

Go Frequency = [c]/Wavelength

Wavelength Given Speed of Light and Frequency

Go Wavelength = [c]/Frequency

Radiation Temperature given Maximum Wavelength

Go Radiation Temperature = 2897.6/Maximum Wavelength

Maximum Wavelength at given Temperature

Go Maximum Wavelength = 2897.6/Radiation Temperature

Resistance in Radiation Heat Transfer when No Shield is Present and Equal Emissivities

Go Resistance = (2/Emissivity)-1

Reflectivity given Absorptivity for Blackbody

Go Reflectivity = 1-Absorptivity

Reflectivity given Emissivity for Blackbody

Go Reflectivity = 1-Emissivity

Net Heat Exchange given Area 2 and Shape Factor 21 Formula

Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)
Q_1-2 = A₂*F₂₁*(E_b1-E_b2)

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 Blackbody?

A black body is defined as the body which absorbs all the electromagnetic radiation (that is light) that strikes it irrespective of the angle of incidence and frequency of the radiation.

How to Calculate Net Heat Exchange given Area 2 and Shape Factor 21?

Net Heat Exchange given Area 2 and Shape Factor 21 calculator uses Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody) to calculate the Net Heat Transfer, The Net Heat Exchange given Area 2 and Shape Factor 21 formula is defined as the product of surface area, shape factor and the difference between emissive power of both the blackbodies. Net Heat Transfer is denoted by Q_1-2 symbol.

How to calculate Net Heat Exchange given Area 2 and Shape Factor 21 using this online calculator? To use this online calculator for Net Heat Exchange given Area 2 and Shape Factor 21, enter Surface Area of Body 2 (A₂), Radiation Shape Factor 21 (F₂₁), Emissive Power of 1st Blackbody (E_b1) & Emissive Power of 2nd Blackbody (E_b2) and hit the calculate button. Here is how the Net Heat Exchange given Area 2 and Shape Factor 21 calculation can be explained with given input values -> 3177.5 = 50*0.41*(680-525).

FAQ

What is Net Heat Exchange given Area 2 and Shape Factor 21?

The Net Heat Exchange given Area 2 and Shape Factor 21 formula is defined as the product of surface area, shape factor and the difference between emissive power of both the blackbodies and is represented as Q_1-2 = A₂*F₂₁*(E_b1-E_b2) or Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody). 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, Emissive Power of 1st 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 & Emissive Power of 2nd 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.

How to calculate Net Heat Exchange given Area 2 and Shape Factor 21?

The Net Heat Exchange given Area 2 and Shape Factor 21 formula is defined as the product of surface area, shape factor and the difference between emissive power of both the blackbodies is calculated using Net Heat Transfer = Surface Area of Body 2*Radiation Shape Factor 21*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody). To calculate Net Heat Exchange given Area 2 and Shape Factor 21, you need Surface Area of Body 2 (A₂), Radiation Shape Factor 21 (F₂₁), Emissive Power of 1st Blackbody (E_b1) & Emissive Power of 2nd Blackbody (E_b2). With our tool, you need to enter the respective value for Surface Area of Body 2, Radiation Shape Factor 21, Emissive Power of 1st Blackbody & Emissive Power of 2nd Blackbody 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 Net Heat Transfer?

In this formula, Net Heat Transfer uses Surface Area of Body 2, Radiation Shape Factor 21, Emissive Power of 1st Blackbody & Emissive Power of 2nd Blackbody. We can use 2 other way(s) to calculate the same, which is/are as follows -

Net Heat Transfer = Surface Area of Body 1*Radiation Shape Factor 12*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)
Net Heat Transfer = Surface Area of Body 1*Radiation Shape Factor 12*(Emissive Power of 1st Blackbody-Emissive Power of 2nd Blackbody)

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