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Critical Radius of Insulation of Hollow Sphere Formula

GoCritical Radius of Insulation of Cylinder Formula

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Critical Radius of Insulation is the radius of insulation at which there is maximum heat transfer and increase or decrease in its value will lead to an overall decrease in heat transfer. Check FAQs

R c = 2 \cdot \frac{K insulation}{h outside}

R_c - Critical Radius of Insulation?K_insulation - Thermal Conductivity of Insulation?h_outside - External Convection Heat Transfer Coefficient?

Critical Radius of Insulation of Hollow Sphere Example

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Here is how the Critical Radius of Insulation of Hollow Sphere equation looks like with Values.

Here is how the Critical Radius of Insulation of Hollow Sphere equation looks like with Units.

Here is how the Critical Radius of Insulation of Hollow Sphere equation looks like.

4.2857 = 2 \cdot \frac{21}{9.8}

4.2857m = 2 \cdot \frac{21W/(m*K)}{9.8W/m²*K}

4.2857 = 2 \cdot \frac{21}{9.8}

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Critical Radius of Insulation of Hollow Sphere Solution

Follow our step by step solution on how to calculate Critical Radius of Insulation of Hollow Sphere?

FIRST Step Consider the formula

R c = 2 \cdot \frac{K insulation}{h outside}

Next Step Substitute values of Variables

∴

R c = 2 \cdot \frac{21W/(m*K)}{9.8W/m²*K}

Next Step Prepare to Evaluate

∴

R c = 2 \cdot \frac{21}{9.8}

Next Step Evaluate

∴

R c = 4.28571428571429m

LAST Step Rounding Answer

∴

R c = 4.2857m

Critical Radius of Insulation of Hollow Sphere Formula Elements

Variables

Critical Radius of Insulation

Critical Radius of Insulation is the radius of insulation at which there is maximum heat transfer and increase or decrease in its value will lead to an overall decrease in heat transfer.

Symbol: R_c

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Critical Radius of Insulation

Thermal Conductivity of Insulation

Thermal Conductivity of Insulation is defined as the ability of insulating material to transmit heat.

Symbol: K_insulation

Measurement: Thermal ConductivityUnit: W/(m*K)

Note: Value should be greater than 0.

Formulas to find Thermal Conductivity of Insulation

External Convection Heat Transfer Coefficient

External Convection Heat Transfer Coefficient is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat in case of convective heat transfer.

Symbol: h_outside

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value should be greater than 0.

Formulas to find External Convection Heat Transfer Coefficient

Other Formulas to find Critical Radius of Insulation

Go Critical Radius of Insulation of Cylinder

R c = \frac{K insulation}{h outside}

Other formulas in Critical Thickness of Insulation category

Go Biot Number using Characteristic Length

Bi = \frac{h transfer \cdot L char}{k fin}

Go Correction Length for Cylindrical Fin with Non-Adiabatic Tip

L cylindrical = L fin + (\frac{d fin}{4})

Go Correction Length for Square Fin with Non-Adiabatic Tip

L sqaure = L fin + (\frac{w fin}{4})

Go Correction Length for Thin Rectangular Fin with Non-Adiabatic Tip

L rectangular = L fin + (\frac{t fin}{2})

How to Evaluate Critical Radius of Insulation of Hollow Sphere?

Critical Radius of Insulation of Hollow Sphere evaluator uses Critical Radius of Insulation = 2*Thermal Conductivity of Insulation/External Convection Heat Transfer Coefficient to evaluate the Critical Radius of Insulation, Critical Radius of Insulation of Hollow Sphere is the radius of insulation at which there is maximum heat transfer and an increase or decrease in its value will lead to an overall decrease in heat transfer. Critical Radius of Insulation is denoted by R_c symbol.

How to evaluate Critical Radius of Insulation of Hollow Sphere using this online evaluator? To use this online evaluator for Critical Radius of Insulation of Hollow Sphere, enter Thermal Conductivity of Insulation (K_insulation) & External Convection Heat Transfer Coefficient (h_outside) and hit the calculate button.

FAQs on Critical Radius of Insulation of Hollow Sphere

What is the formula to find Critical Radius of Insulation of Hollow Sphere?

The formula of Critical Radius of Insulation of Hollow Sphere is expressed as Critical Radius of Insulation = 2*Thermal Conductivity of Insulation/External Convection Heat Transfer Coefficient. Here is an example- 4.285714 = 2*21/9.8.

How to calculate Critical Radius of Insulation of Hollow Sphere?

With Thermal Conductivity of Insulation (K_insulation) & External Convection Heat Transfer Coefficient (h_outside) we can find Critical Radius of Insulation of Hollow Sphere using the formula - Critical Radius of Insulation = 2*Thermal Conductivity of Insulation/External Convection Heat Transfer Coefficient.

What are the other ways to Calculate Critical Radius of Insulation?

Here are the different ways to Calculate Critical Radius of Insulation-

Critical Radius of Insulation=Thermal Conductivity of Insulation/External Convection Heat Transfer Coefficient

Can the Critical Radius of Insulation of Hollow Sphere be negative?

No, the Critical Radius of Insulation of Hollow Sphere, measured in Length cannot be negative.

Which unit is used to measure Critical Radius of Insulation of Hollow Sphere?

Critical Radius of Insulation of Hollow Sphere is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Critical Radius of Insulation of Hollow Sphere can be measured.

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Critical Radius of Insulation of Hollow Sphere Formula

​GoCritical Radius of Insulation of Cylinder Formula

Critical Radius of Insulation of Hollow Sphere Example

Critical Radius of Insulation of Hollow Sphere Solution

Critical Radius of Insulation of Hollow Sphere Formula Elements

Other Formulas to find Critical Radius of Insulation

Other formulas in Critical Thickness of Insulation category

How to Evaluate Critical Radius of Insulation of Hollow Sphere?

FAQs on Critical Radius of Insulation of Hollow Sphere

Variable Name

GoCritical Radius of Insulation of Cylinder Formula