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Equivalent radiative heat transfer coefficient Calculator

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✖Average Temperature of Absorber Plate is the average temperature of the absorber plate in a solar air heater, which affects the overall system efficiency.ⓘ Average Temperature of Absorber Plate [T_pm]			+10% -10%
✖Mean Temperature of Plate below is the average temperature of the plate in a solar air heater, which affects the heat transfer and overall efficiency.ⓘ Mean Temperature of Plate below [T_bm]			+10% -10%
✖Emissivity of Absorber Plate Surface is a measure of the ability of the absorber plate surface to emit heat in a solar air heater.ⓘ Emissivity of Absorber Plate Surface [ε_p]			+10% -10%
✖Emissivity of Bottom Plate Surface is a measure of the ability of the bottom plate surface of a solar air heater to emit heat by radiation.ⓘ Emissivity of Bottom Plate Surface [ε_b]			+10% -10%

✖Equivalent Radiative Heat Transfer Coefficient is the rate of heat transfer between the solar air heater and its surroundings through radiation.ⓘ Equivalent radiative heat transfer coefficient [h_r]

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Equivalent radiative heat transfer coefficient Solution

STEP 0: Pre-Calculation Summary

Formula Used

Equivalent Radiative Heat Transfer Coefficient = (4*[Stefan-BoltZ]*(Average Temperature of Absorber Plate+Mean Temperature of Plate below)^3)/((1/Emissivity of Absorber Plate Surface)+(1/Emissivity of Bottom Plate Surface)-1*(8))
h_r = (4*[Stefan-BoltZ]*(T_pm+T_bm)^3)/((1/ε_p)+(1/ε_b)-1*(8))
This formula uses 1 Constants, 5 Variables

Constants Used

[Stefan-BoltZ] - Stefan-Boltzmann Constant Value Taken As 5.670367E-8

Variables Used

Equivalent Radiative Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Equivalent Radiative Heat Transfer Coefficient is the rate of heat transfer between the solar air heater and its surroundings through radiation.
Average Temperature of Absorber Plate - (Measured in Kelvin) - Average Temperature of Absorber Plate is the average temperature of the absorber plate in a solar air heater, which affects the overall system efficiency.
Mean Temperature of Plate below - (Measured in Kelvin) - Mean Temperature of Plate below is the average temperature of the plate in a solar air heater, which affects the heat transfer and overall efficiency.
Emissivity of Absorber Plate Surface - Emissivity of Absorber Plate Surface is a measure of the ability of the absorber plate surface to emit heat in a solar air heater.
Emissivity of Bottom Plate Surface - Emissivity of Bottom Plate Surface is a measure of the ability of the bottom plate surface of a solar air heater to emit heat by radiation.

STEP 1: Convert Input(s) to Base Unit

Average Temperature of Absorber Plate: 107.69 Kelvin --> 107.69 Kelvin No Conversion Required
Mean Temperature of Plate below: 38.96489 Kelvin --> 38.96489 Kelvin No Conversion Required
Emissivity of Absorber Plate Surface: 0.2 --> No Conversion Required
Emissivity of Bottom Plate Surface: 0.27659 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

h_r = (4*[Stefan-BoltZ]*(T_pm+T_bm)^3)/((1/ε_p)+(1/ε_b)-1*(8)) --> (4*[Stefan-BoltZ]*(107.69+38.96489)^3)/((1/0.2)+(1/0.27659)-1*(8))

Evaluating ... ...

h_r = 1.16241493266763

STEP 3: Convert Result to Output's Unit

1.16241493266763 Watt per Square Meter per Kelvin --> No Conversion Required

FINAL ANSWER

1.16241493266763 ≈ 1.162415 Watt per Square Meter per Kelvin <-- Equivalent Radiative Heat Transfer Coefficient

(Calculation completed in 00.020 seconds)

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Created by ADITYA RAWAT

DIT UNIVERSITY (DITU), Dehradun

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National Institute Of Technology (NIT), Hamirpur

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Effective heat transfer coefficient for variation

LaTeX Go Effective Heat Transfer Coefficient = Convective Heat Transfer Coeff of Solar*(1+(2*Fin Height*Fin Effectiveness*Convective Heat Transfer Coeff of Solar Fin)/(Distance between Fins*Convective Heat Transfer Coeff of Solar))+(Equivalent Radiative Heat Transfer Coefficient*Convective Heat Transfer Coeff of Solar Bottom)/(Equivalent Radiative Heat Transfer Coefficient+Convective Heat Transfer Coeff of Solar Bottom)

Effective heat transfer coefficient

LaTeX Go Effective Heat Transfer Coefficient = Convective Heat Transfer Coeff of Solar+(Equivalent Radiative Heat Transfer Coefficient*Convective Heat Transfer Coeff of Solar Bottom)/(Equivalent Radiative Heat Transfer Coefficient+Convective Heat Transfer Coeff of Solar Bottom)

Equivalent radiative heat transfer coefficient

LaTeX Go Equivalent Radiative Heat Transfer Coefficient = (4*[Stefan-BoltZ]*(Average Temperature of Absorber Plate+Mean Temperature of Plate below)^3)/((1/Emissivity of Absorber Plate Surface)+(1/Emissivity of Bottom Plate Surface)-1*(8))

Collector efficiency factor

LaTeX Go Collector Efficiency Factor = (1+Overall Loss Coefficient/Effective Heat Transfer Coefficient)^-1

Equivalent radiative heat transfer coefficient Formula

LaTeX Go

What is Heat Transfer Coefficient Radiation?

Radiative heat transfer is a comparison of an actual material's emissivity to a “black body”. The radiative exchange between two gray, diffuse surfaces may be characterized by calculating the radiative heat transfer coefficient.

How to Calculate Equivalent radiative heat transfer coefficient?

Equivalent radiative heat transfer coefficient calculator uses Equivalent Radiative Heat Transfer Coefficient = (4*[Stefan-BoltZ]*(Average Temperature of Absorber Plate+Mean Temperature of Plate below)^3)/((1/Emissivity of Absorber Plate Surface)+(1/Emissivity of Bottom Plate Surface)-1*(8)) to calculate the Equivalent Radiative Heat Transfer Coefficient, Equivalent radiative heat transfer coefficient formula is defined as a measure of the heat transfer rate between two surfaces due to radiation, considering the emissivity of both surfaces and the average temperature of the plates in a solar air heater. Equivalent Radiative Heat Transfer Coefficient is denoted by h_r symbol.

How to calculate Equivalent radiative heat transfer coefficient using this online calculator? To use this online calculator for Equivalent radiative heat transfer coefficient, enter Average Temperature of Absorber Plate (T_pm), Mean Temperature of Plate below (T_bm), Emissivity of Absorber Plate Surface (ε_p) & Emissivity of Bottom Plate Surface (ε_b) and hit the calculate button. Here is how the Equivalent radiative heat transfer coefficient calculation can be explained with given input values -> 0.015684 = (4*[Stefan-BoltZ]*(107.69+38.96489)^3)/((1/0.2)+(1/0.27659)-1*(8)).

FAQ

What is Equivalent radiative heat transfer coefficient?

Equivalent radiative heat transfer coefficient formula is defined as a measure of the heat transfer rate between two surfaces due to radiation, considering the emissivity of both surfaces and the average temperature of the plates in a solar air heater and is represented as h_r = (4*[Stefan-BoltZ]*(T_pm+T_bm)^3)/((1/ε_p)+(1/ε_b)-1*(8)) or Equivalent Radiative Heat Transfer Coefficient = (4*[Stefan-BoltZ]*(Average Temperature of Absorber Plate+Mean Temperature of Plate below)^3)/((1/Emissivity of Absorber Plate Surface)+(1/Emissivity of Bottom Plate Surface)-1*(8)). Average Temperature of Absorber Plate is the average temperature of the absorber plate in a solar air heater, which affects the overall system efficiency, Mean Temperature of Plate below is the average temperature of the plate in a solar air heater, which affects the heat transfer and overall efficiency, Emissivity of Absorber Plate Surface is a measure of the ability of the absorber plate surface to emit heat in a solar air heater & Emissivity of Bottom Plate Surface is a measure of the ability of the bottom plate surface of a solar air heater to emit heat by radiation.

How to calculate Equivalent radiative heat transfer coefficient?

Equivalent radiative heat transfer coefficient formula is defined as a measure of the heat transfer rate between two surfaces due to radiation, considering the emissivity of both surfaces and the average temperature of the plates in a solar air heater is calculated using Equivalent Radiative Heat Transfer Coefficient = (4*[Stefan-BoltZ]*(Average Temperature of Absorber Plate+Mean Temperature of Plate below)^3)/((1/Emissivity of Absorber Plate Surface)+(1/Emissivity of Bottom Plate Surface)-1*(8)). To calculate Equivalent radiative heat transfer coefficient, you need Average Temperature of Absorber Plate (T_pm), Mean Temperature of Plate below (T_bm), Emissivity of Absorber Plate Surface (ε_p) & Emissivity of Bottom Plate Surface (ε_b). With our tool, you need to enter the respective value for Average Temperature of Absorber Plate, Mean Temperature of Plate below, Emissivity of Absorber Plate Surface & Emissivity of Bottom Plate Surface 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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