Bottom loss coefficient Calculator

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✖Thermal Conductivity of Insulation is defined as the ability of insulating material to transmit heat.ⓘ Thermal Conductivity of Insulation [K_Insulation]			+10% -10%
✖Thickness of insulation is the difference between the radius of insulation and radius of the body on which it is used .ⓘ Thickness of Insulation [δ_b]			+10% -10%

✖Bottom loss coefficient is evaluated by considering conduction and convection losses from the absorber plate in the downward direction.ⓘ Bottom loss coefficient [U_b]

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Formula

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Bottom loss coefficient

Formula

`"U"_{"b"} = "K"_{"Insulation"}/"δ"_{"b"}`

Example

`"52.5W/m²*K"="21W/(m*K)"/"0.4m"`

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Bottom loss coefficient Solution

STEP 0: Pre-Calculation Summary

Formula Used

Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation
U_b = K_Insulation/δ_b
This formula uses 3 Variables

Variables Used

Bottom Loss Coefficient - (Measured in Watt per Square Meter per Kelvin) - Bottom loss coefficient is evaluated by considering conduction and convection losses from the absorber plate in the downward direction.
Thermal Conductivity of Insulation - (Measured in Watt per Meter per K) - Thermal Conductivity of Insulation is defined as the ability of insulating material to transmit heat.
Thickness of Insulation - (Measured in Meter) - Thickness of insulation is the difference between the radius of insulation and radius of the body on which it is used .

STEP 1: Convert Input(s) to Base Unit

Thermal Conductivity of Insulation: 21 Watt per Meter per K --> 21 Watt per Meter per K No Conversion Required
Thickness of Insulation: 0.4 Meter --> 0.4 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

U_b = K_Insulation/δ_b --> 21/0.4

Evaluating ... ...

U_b = 52.5

STEP 3: Convert Result to Output's Unit

52.5 Watt per Square Meter per Kelvin --> No Conversion Required

FINAL ANSWER

52.5 Watt per Square Meter per Kelvin <-- Bottom Loss Coefficient

(Calculation completed in 00.004 seconds)

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Created by ADITYA RAWAT

DIT UNIVERSITY (DITU), Dehradun

ADITYA RAWAT has created this Calculator and 50+ more calculators!

Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

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< 10+ Liquid Flat Plate Collectors Calculators

Collection efficiency when collector efficiency factor is present

Go Instantaneous Collection Efficiency = (Collector Efficiency Factor*(Area of absorber plate/Gross Collector Area)*Average Transmissivity-absorptivity Product)-(Collector Efficiency Factor*Area of absorber plate*Overall loss coefficient*(Average of Inlet and Outlet Temperature of fluid-Ambient Air Temperature)*1/Flux Incident on Top Cover)

Collection efficiency when heat removal factor is present

Go Instantaneous Collection Efficiency = Collector heat removal factor*(Area of absorber plate/Gross Collector Area)*(Flux absorbed by plate/Flux Incident on Top Cover-((Overall loss coefficient*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover))

Collector heat removal factor

Go Collector heat removal factor = (Mass Flow Rate*Specific Heat Capacity at Constant Pressure)/(Overall loss coefficient*Gross Collector Area)*(1-e^(-(Collector Efficiency Factor*Overall loss coefficient*Gross Collector Area)/(Mass Flow Rate*Specific Heat Capacity at Constant Pressure)))

Collection efficiency when average transmissivity-absorptivity product is present

Go Instantaneous Collection Efficiency = Collector heat removal factor*(Area of absorber plate/Gross Collector Area)*(Average Transmissivity-absorptivity Product-(Overall loss coefficient*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover)

Heat loss from collector

Go Heat Loss from Collector = Overall loss coefficient*Area of absorber plate*(Average temperature of absorber plate-Ambient Air Temperature)

Collection efficiency when fluid temperature is present

Go Instantaneous Collection Efficiency = (0.692-4.024*(Inlet fluid temperature flat plate collector-Ambient Air Temperature))/Flux Incident on Top Cover

Transmissivity Absorptivity product

Go Transmissivity - Absorptivity product = Transmissivity*Absorptivity/(1-(1-Absorptivity)*Diffuse Reflectivity)

Instantaneous collection efficiency

Go Instantaneous Collection Efficiency = Useful heat gain/(Gross Collector Area*Flux Incident on Top Cover)

Useful heat gain

Go Useful heat gain = Area of absorber plate*Flux absorbed by plate-Heat Loss from Collector

Bottom loss coefficient

Go Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation

Bottom loss coefficient Formula

Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation
U_b = K_Insulation/δ_b

How bottom loss coefficient is evaluated?

Bottom loss coefficient is evaluated by considering conduction and convection losses from the absorber plate in a downward direction through the bottom of the collector.

How to Calculate Bottom loss coefficient?

Bottom loss coefficient calculator uses Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation to calculate 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 calculate Bottom loss coefficient using this online calculator? To use this online calculator for Bottom loss coefficient, enter Thermal Conductivity of Insulation (K_Insulation) & Thickness of Insulation (δ_b) and hit the calculate button. Here is how the Bottom loss coefficient calculation can be explained with given input values -> 52.5 = 21/0.4.

FAQ

What is 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 and is represented as U_b = K_Insulation/δ_b or Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation. Thermal Conductivity of Insulation is defined as the ability of insulating material to transmit heat & Thickness of insulation is the difference between the radius of insulation and radius of the body on which it is used .

How to calculate 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 is calculated using Bottom Loss Coefficient = Thermal Conductivity of Insulation/Thickness of Insulation. To calculate Bottom loss coefficient, you need Thermal Conductivity of Insulation (K_Insulation) & Thickness of Insulation (δ_b). With our tool, you need to enter the respective value for Thermal Conductivity of Insulation & Thickness of Insulation and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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