Thermal Resistance in Heat Transfer Formulas

Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. And is denoted by R_th. Thermal Resistance is usually measured using the Kelvin per Watt for Thermal Resistance. Note that the value of Thermal Resistance is always negative.

Formulas to find Thermal Resistance in Heat Transfer

fxThermal Resistance for Convection at Outer SurfaceGo

fxThermal Resistance for Convection at Inner SurfaceGo

fxThermal Resistance for Conduction at Tube WallGo

Heat Transfer formulas that make use of Thermal Resistance

fxOutside Area given Outer Thermal ResistanceGo

fxOutside Heat Transfer Coefficient given Thermal ResistanceGo

fxInside Area given Thermal Resistance for Inner SurfaceGo

fxInner Heat Transfer Coefficient given Inner Thermal ResistanceGo

List of variables in Heat Transfer formulas

fx External Convection Heat Transfer Coefficient Go

fx Outside Area Go

fx Inside Area Go

fx Inside Convection Heat Transfer Coefficient Go

fx Outer Radius of Cylinder Go

fx Inner Radius of Cylinder Go

fx Thermal Conductivity Go

fx Length of Cylinder Go

FAQ

What is the Thermal Resistance?

Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. Thermal Resistance is usually measured using the Kelvin per Watt for Thermal Resistance. Note that the value of Thermal Resistance is always negative.

Can the Thermal Resistance be negative?

Yes, the Thermal Resistance, measured in Thermal Resistance can be negative.

What unit is used to measure Thermal Resistance?

Thermal Resistance is usually measured using the Kelvin per Watt[K/W] for Thermal Resistance. Degree Fahrenheit hour per Btu (IT)[K/W], Degree Fahrenheit Hour per Btu (th)[K/W], Kelvin per Milliwatt[K/W] are the few other units in which Thermal Resistance can be measured.

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