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

✖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.ⓘ Emissivity [ε]

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✖Resistance for heat radiation is represented as the reciprocal of the product of the radiative heat transfer coefficient and the surface area of the object that generates heat.ⓘ Resistance in Radiation Heat Transfer when No Shield is Present and Equal Emissivities [R]

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Formula

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

Formula

`"R" = (2/"ε")-1`

Example

`"1.105263"=(2/"0.95")-1`

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

STEP 0: Pre-Calculation Summary

Formula Used

Resistance = (2/Emissivity)-1
R = (2/ε)-1
This formula uses 2 Variables

Variables Used

Resistance - Resistance for heat radiation is represented as the reciprocal of the product of the radiative heat transfer coefficient and the surface area of the object that generates heat.
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.

STEP 1: Convert Input(s) to Base Unit

Emissivity: 0.95 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R = (2/ε)-1 --> (2/0.95)-1

Evaluating ... ...

R = 1.10526315789474

STEP 3: Convert Result to Output's Unit

1.10526315789474 --> No Conversion Required

FINAL ANSWER

1.10526315789474 ≈ 1.105263 <-- Resistance

(Calculation completed in 00.004 seconds)

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University School of Chemical Technology-USCT (GGSIPU), New Delhi

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< 23 Radiation Formulas Calculators

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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)

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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

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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)

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Go Energy of Each Quanta = [hP]*Frequency

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Go Wavelength = [c]/Frequency

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Go Frequency = [c]/Wavelength

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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

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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 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))