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Bottom loss coefficient Formula

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Bottom loss coefficient is evaluated by considering conduction and convection losses from the absorber plate in the downward direction. Check FAQs

U b = \frac{K Insulation}{δ b}

U_b - Bottom Loss Coefficient?K_Insulation - Thermal Conductivity of Insulation?δ_b - Thickness of Insulation?

Bottom loss coefficient Example

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Here is how the Bottom loss coefficient equation looks like with Values.

Here is how the Bottom loss coefficient equation looks like with Units.

Here is how the Bottom loss coefficient equation looks like.

52.5 = \frac{21}{0.4}

52.5W/m²*K = \frac{21W/(m*K)}{0.4m}

52.5 = \frac{21}{0.4}

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Bottom loss coefficient Solution

Follow our step by step solution on how to calculate Bottom loss coefficient?

FIRST Step Consider the formula

U b = \frac{K Insulation}{δ b}

Next Step Substitute values of Variables

∴

U b = \frac{21W/(m*K)}{0.4m}

Next Step Prepare to Evaluate

∴

U b = \frac{21}{0.4}

LAST Step Evaluate

∴

U b = 52.5W/m²*K

Bottom loss coefficient Formula Elements

Variables

Bottom Loss Coefficient

Bottom loss coefficient is evaluated by considering conduction and convection losses from the absorber plate in the downward direction.

Symbol: U_b

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Bottom Loss Coefficient

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

Thickness of Insulation

Thickness of insulation is the difference between the radius of insulation and radius of the body on which it is used .

Symbol: δ_b

Measurement: LengthUnit: m

Note: Value can be positive or negative.

Formulas to find Thickness of Insulation

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Go Heat loss from collector

q l = U l \cdot A p \cdot (T pm - T a)

How to Evaluate Bottom loss coefficient?

Bottom loss coefficient evaluator uses Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation to evaluate the Bottom Loss Coefficient, The Bottom loss coefficient formula is defined as heat loss per unit area and temperature difference between absorber plate and surrounding air. Bottom Loss Coefficient is denoted by U_b symbol.

How to evaluate Bottom loss coefficient using this online evaluator? To use this online evaluator for Bottom loss coefficient, enter Thermal Conductivity of Insulation (K_Insulation) & Thickness of Insulation (δ_b) and hit the calculate button.

FAQs on Bottom loss coefficient

What is the formula to find Bottom loss coefficient?

The formula of Bottom loss coefficient is expressed as Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation. Here is an example- 52.5 = 21/0.4.

How to calculate Bottom loss coefficient?

With Thermal Conductivity of Insulation (K_Insulation) & Thickness of Insulation (δ_b) we can find Bottom loss coefficient using the formula - Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation.

Can the Bottom loss coefficient be negative?

Yes, the Bottom loss coefficient, measured in Heat Transfer Coefficient can be negative.

Which unit is used to measure Bottom loss coefficient?

Bottom loss coefficient is usually measured using the Watt per Square Meter per Kelvin[W/m²*K] for Heat Transfer Coefficient. Watt per Square Meter per Celcius[W/m²*K], Joule per Second per Square Meter per Kelvin[W/m²*K], Kilocalorie (IT) per Hour per Square Foot per Celcius[W/m²*K] are the few other units in which Bottom loss coefficient can be measured.

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