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## Credits

Vallurupalli Nageswara Rao Vignana Jyothi Institute of Engineering and Technology (VNRVJIET), Hyderabad
Sai Venkata Phanindra Chary Arendra has created this Calculator and 100+ more calculators!
PSG College of Technology (PSGCT), Coimbatore
Maiarutselvan V has verified this Calculator and 200+ more calculators!

## Thermal resistance of a composite wall with 3 layers in series Solution

STEP 0: Pre-Calculation Summary
Formula Used
thermal_resistance = (length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area))
th = (l1/(k1*A))+(L2/(k2*A))+(L3/(k3*A))
This formula uses 7 Variables
Variables Used
length 1 - Length 1 is the length of the first body. (Measured in Meter)
thermal conductivity 1 - Thermal conductivity 1 is the thermal conductivity of the first body (Measured in Watt per Meter per K)
Area - The area is the amount of two-dimensional space taken up by an object. (Measured in Square Meter)
length 2 - Length 2 is the length of the second body/abject/section (Measured in Meter)
thermal conductivity 2 - Thermal conductivity 2 is the thermal conductivity of the second body (Measured in Watt per Meter per K)
length 3 - Length 3 is the length of the third body/object/section (Measured in Meter)
thermal conductivity 3 - Thermal conductivity 3 is the thermal conductivity of the third body (Measured in Watt per Meter per K)
STEP 1: Convert Input(s) to Base Unit
length 1: 1 Meter --> 1 Meter No Conversion Required
thermal conductivity 1: 1 Watt per Meter per K --> 1 Watt per Meter per K No Conversion Required
Area: 50 Square Meter --> 50 Square Meter No Conversion Required
length 2: 1 Meter --> 1 Meter No Conversion Required
thermal conductivity 2: 1 Watt per Meter per K --> 1 Watt per Meter per K No Conversion Required
length 3: 1 Meter --> 1 Meter No Conversion Required
thermal conductivity 3: 1 Watt per Meter per K --> 1 Watt per Meter per K No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
th = (l1/(k1*A))+(L2/(k2*A))+(L3/(k3*A)) --> (1/(1*50))+(1/(1*50))+(1/(1*50))
Evaluating ... ...
th = 0.06
STEP 3: Convert Result to Output's Unit
0.06 Kelvin per Watt --> No Conversion Required
FINAL ANSWER
0.06 Kelvin per Watt <-- Thermal resistance
(Calculation completed in 00.032 seconds)

## < 10+ Plane walls Calculators

Inner surface temperature of a composite wall of 3 layers in series
inner_surface_temperature = outer surface temperature+(heat flow rate*((length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area)))) Go
Area of a composite wall of 3 layers
area = (heat flow rate/(inner surface temperature-outer surface temperature))*((length 1/thermal conductivity 1)+(length 2/thermal conductivity 2)+(length 3/thermal conductivity 3)) Go
Length of the 2nd layer of the composite wall for a given temperature difference
length_2 = (thermal conductivity 2*Area)*(((inner surface temperature-outer surface temperature)/heat flow rate)-(length 1/(thermal conductivity 1*Area))) Go
Inner surface temperature of a composite wall of 2 layers in series
inner_surface_temperature = outer surface temperature+(heat flow rate*((length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area)))) Go
Total thermal resistance of a plain wall with convection on either side
thermal_resistance = (1/(inside convection heat transfer coefficient*Area))+(Length/(Thermal Conductivity*Area))+(1/(External convection heat transfer coefficient*Area)) Go
Area of a composite wall of 2 layers
area = (heat flow rate/(inner surface temperature-outer surface temperature))*((length 1/thermal conductivity 1)+(length 2/thermal conductivity 2)) Go
Temperature at distance x from the inner surface in the wall
temperature = inner surface temperature-((distance from inner surface/Length)*(inner surface temperature-outer surface temperature)) Go
Interface temperature of composite wall of 2 layers when outer surface temperature is known
temperature_surface_2 = outer surface temperature+((heat flow rate*length 2)/(thermal conductivity 2*Area)) Go
Inner surface temperature of a plane wall
inner_surface_temperature = outer surface temperature+((heat flow rate*Length)/(Thermal Conductivity*Area)) Go
Interface temperature of composite wall of 2 layers when inner surface temperature is known
temperature_surface_2 = Temperature of surface 1-((heat flow rate*length 1)/(thermal conductivity 1*Area)) Go

### Thermal resistance of a composite wall with 3 layers in series Formula

thermal_resistance = (length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area))
th = (l1/(k1*A))+(L2/(k2*A))+(L3/(k3*A))

## What is 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 the reciprocal of thermal conductance.

## How to Calculate Thermal resistance of a composite wall with 3 layers in series?

Thermal resistance of a composite wall with 3 layers in series calculator uses thermal_resistance = (length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area)) to calculate the Thermal resistance, The Thermal resistance of a composite wall with 3 layers in series formula is defined as the total thermal resistance of a 3 layered composite wall, with the walls placed in series. Thermal resistance and is denoted by th symbol.

How to calculate Thermal resistance of a composite wall with 3 layers in series using this online calculator? To use this online calculator for Thermal resistance of a composite wall with 3 layers in series, enter length 1 (l1), thermal conductivity 1 (k1), Area (A), length 2 (L2), thermal conductivity 2 (k2), length 3 (L3) and thermal conductivity 3 (k3) and hit the calculate button. Here is how the Thermal resistance of a composite wall with 3 layers in series calculation can be explained with given input values -> 0.06 = (1/(1*50))+(1/(1*50))+(1/(1*50)).

### FAQ

What is Thermal resistance of a composite wall with 3 layers in series?
The Thermal resistance of a composite wall with 3 layers in series formula is defined as the total thermal resistance of a 3 layered composite wall, with the walls placed in series and is represented as th = (l1/(k1*A))+(L2/(k2*A))+(L3/(k3*A)) or thermal_resistance = (length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area)). Length 1 is the length of the first body, Thermal conductivity 1 is the thermal conductivity of the first body, The area is the amount of two-dimensional space taken up by an object, Length 2 is the length of the second body/abject/section, Thermal conductivity 2 is the thermal conductivity of the second body , Length 3 is the length of the third body/object/section and Thermal conductivity 3 is the thermal conductivity of the third body .
How to calculate Thermal resistance of a composite wall with 3 layers in series?
The Thermal resistance of a composite wall with 3 layers in series formula is defined as the total thermal resistance of a 3 layered composite wall, with the walls placed in series is calculated using thermal_resistance = (length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area)). To calculate Thermal resistance of a composite wall with 3 layers in series, you need length 1 (l1), thermal conductivity 1 (k1), Area (A), length 2 (L2), thermal conductivity 2 (k2), length 3 (L3) and thermal conductivity 3 (k3). With our tool, you need to enter the respective value for length 1, thermal conductivity 1, Area, length 2, thermal conductivity 2, length 3 and thermal conductivity 3 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 Thermal resistance?
In this formula, Thermal resistance uses length 1, thermal conductivity 1, Area, length 2, thermal conductivity 2, length 3 and thermal conductivity 3. We can use 10 other way(s) to calculate the same, which is/are as follows -
• temperature = inner surface temperature-((distance from inner surface/Length)*(inner surface temperature-outer surface temperature))
• inner_surface_temperature = outer surface temperature+(heat flow rate*((length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))))
• inner_surface_temperature = outer surface temperature+(heat flow rate*((length 1/(thermal conductivity 1*Area))+(length 2/(thermal conductivity 2*Area))+(length 3/(thermal conductivity 3*Area))))
• inner_surface_temperature = outer surface temperature+((heat flow rate*Length)/(Thermal Conductivity*Area))
• thermal_resistance = (1/(inside convection heat transfer coefficient*Area))+(Length/(Thermal Conductivity*Area))+(1/(External convection heat transfer coefficient*Area))
• temperature_surface_2 = Temperature of surface 1-((heat flow rate*length 1)/(thermal conductivity 1*Area))
• temperature_surface_2 = outer surface temperature+((heat flow rate*length 2)/(thermal conductivity 2*Area))
• area = (heat flow rate/(inner surface temperature-outer surface temperature))*((length 1/thermal conductivity 1)+(length 2/thermal conductivity 2))
• area = (heat flow rate/(inner surface temperature-outer surface temperature))*((length 1/thermal conductivity 1)+(length 2/thermal conductivity 2)+(length 3/thermal conductivity 3))
• length_2 = (thermal conductivity 2*Area)*(((inner surface temperature-outer surface temperature)/heat flow rate)-(length 1/(thermal conductivity 1*Area)))
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