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Heat Flow Rate through Composite Wall of 2 Layers in Series Formula

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Heat Flow Rate 2 layer is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium. Check FAQs

Q l2 = \frac{T i2 - T o2}{\frac{L 1}{k 1 \cdot A w2} + \frac{L 2}{k 2 \cdot A w2}}

Q_l2 - Heat Flow Rate 2 Layer?T_i2 - Inner Surface Temperature 2 layer wall?T_o2 - Outer Surface Temperature of 2 Layer?L₁ - Length 1?k₁ - Thermal Conductivity 1?A_w2 - Area of 2 Layer Wall?L₂ - Length 2?k₂ - Thermal Conductivity 2?

Heat Flow Rate through Composite Wall of 2 Layers in Series Example

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Here is how the Heat Flow Rate through Composite Wall of 2 Layers in Series equation looks like with Values.

Here is how the Heat Flow Rate through Composite Wall of 2 Layers in Series equation looks like with Units.

Here is how the Heat Flow Rate through Composite Wall of 2 Layers in Series equation looks like.

120 = \frac{420.75 - 420}{\frac{2}{1.6 \cdot 866.6667} + \frac{5}{1.2 \cdot 866.6667}}

120W = \frac{420.75K - 420K}{\frac{2m}{1.6W/(m*K) \cdot 866.6667m²} + \frac{5m}{1.2W/(m*K) \cdot 866.6667m²}}

120 = \frac{420.75 - 420}{\frac{2}{1.6 \cdot 866.6667} + \frac{5}{1.2 \cdot 866.6667}}

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Heat Flow Rate through Composite Wall of 2 Layers in Series Solution

Follow our step by step solution on how to calculate Heat Flow Rate through Composite Wall of 2 Layers in Series?

FIRST Step Consider the formula

Q l2 = \frac{T i2 - T o2}{\frac{L 1}{k 1 \cdot A w2} + \frac{L 2}{k 2 \cdot A w2}}

Next Step Substitute values of Variables

∴

Q l2 = \frac{420.75K - 420K}{\frac{2m}{1.6W/(m*K) \cdot 866.6667m²} + \frac{5m}{1.2W/(m*K) \cdot 866.6667m²}}

Next Step Prepare to Evaluate

∴

Q l2 = \frac{420.75 - 420}{\frac{2}{1.6 \cdot 866.6667} + \frac{5}{1.2 \cdot 866.6667}}

Next Step Evaluate

∴

Q l2 = 120.000004615385W

LAST Step Rounding Answer

∴

Q l2 = 120W

Heat Flow Rate through Composite Wall of 2 Layers in Series Formula Elements

Variables

Heat Flow Rate 2 Layer

Heat Flow Rate 2 layer is the amount of heat that is transferred per unit of time in some material, usually measured in watt. Heat is the flow of thermal energy driven by thermal non-equilibrium.

Symbol: Q_l2

Measurement: PowerUnit: W

Note: Value can be positive or negative.

Formulas to find Heat Flow Rate 2 Layer

Inner Surface Temperature 2 layer wall

Inner Surface Temperature 2 layer wall is the temperature at the inner surface of the wall (either plane wall or cylindrical wall or spherical wall, etc).

Symbol: T_i2

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Inner Surface Temperature 2 layer wall

Outer Surface Temperature of 2 Layer

Outer Surface Temperature of 2 layer is the temperature at the outer surface of the wall either plane wall or cylindrical wall or spherical wall, etc.

Symbol: T_o2

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Outer Surface Temperature of 2 Layer

Length 1

Length 1 is the length of the first body.

Symbol: L₁

Measurement: LengthUnit: m