Heat transfer coefficient due to radiation for horizontal tubes Calculator

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✖Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.ⓘ Emissivity [ε]			+10% -10%
✖Wall Temperature is the temperature at the wall.ⓘ Wall Temperature [T_w]			+10% -10%
✖Saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase.ⓘ Saturation Temperature [T_s]			+10% -10%

✖Heat Transfer Coefficient by Radiation is the heat transferred per unit area per kelvin.ⓘ Heat transfer coefficient due to radiation for horizontal tubes [h_r]

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Formula

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Heat transfer coefficient due to radiation for horizontal tubes

Formula

`"h"_{"r"} = "[Stefan-BoltZ]"*"ε"*((("T"_{"w"}^4)-("T"_{"s"}^4))/("T"_{"w"}-"T"_{"s"}))`

Example

`"1.5W/m²*K"="[Stefan-BoltZ]"*"0.406974"*(((("300K")^4)-(("200K")^4))/("300K"-"200K"))`

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Heat transfer coefficient due to radiation for horizontal tubes Solution

STEP 0: Pre-Calculation Summary

Formula Used

Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature))
h_r = [Stefan-BoltZ]*ε*(((T_w^4)-(T_s^4))/(T_w-T_s))
This formula uses 1 Constants, 4 Variables

Constants Used

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

Variables Used

Heat Transfer Coefficient by Radiation - (Measured in Watt per Square Meter per Kelvin) - Heat Transfer Coefficient by Radiation is the heat transferred per unit area per kelvin.
Emissivity - Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.
Wall Temperature - (Measured in Kelvin) - Wall Temperature is the temperature at the wall.
Saturation Temperature - (Measured in Kelvin) - Saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase.

STEP 1: Convert Input(s) to Base Unit

Emissivity: 0.406974 --> No Conversion Required
Wall Temperature: 300 Kelvin --> 300 Kelvin No Conversion Required
Saturation Temperature: 200 Kelvin --> 200 Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

h_r = [Stefan-BoltZ]*ε*(((T_w^4)-(T_s^4))/(T_w-T_s)) --> [Stefan-BoltZ]*0.406974*(((300^4)-(200^4))/(300-200))

Evaluating ... ...

h_r = 1.4999997606477

STEP 3: Convert Result to Output's Unit

1.4999997606477 Watt per Square Meter per Kelvin --> No Conversion Required

FINAL ANSWER

1.4999997606477 ≈ 1.5 Watt per Square Meter per Kelvin <-- Heat Transfer Coefficient by Radiation

(Calculation completed in 00.006 seconds)

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Home » Physics » Heat and Mass Transfer » Convection » Boiling » Heat transfer coefficient due to radiation for horizontal tubes

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Maximum heat flux to nucleate pool boiling

Go Maximum Heat Flux = (1.464*10^-9)*(((Specific Heat of Liquid*(Thermal Conductivity of Liquid^2)*(Density of Liquid^0.5)*(Density of Liquid-Density of Vapour))/(Density of Vapour*Change in Enthalpy of Vaporization*Dynamic Viscosity of Fluid^0.5))^0.5)*(((Change in Enthalpy of Vaporization*Density of Vapour*Excess Temperature)/(Surface Tension*Temperature of Fluid))^2.3)

Heat transfer coefficient by convection for stable film boiling

Go Heat Transfer Coefficient by Convection = 0.62*((Thermal Conductivity of Vapor^3*Density of Vapour*[g]*(Density of Liquid-Density of Vapour)*(Change in Enthalpy of Vaporization+(0.68*Specific Heat of Vapour)*Excess Temperature))/(Dynamic Viscosity of Vapour*Diameter*Excess Temperature))^0.25

Heat flux to nucleate pool boiling

Go Heat Flux = Dynamic Viscosity of Fluid*Change in Enthalpy of Vaporization*((([g]*(Density of Liquid-Density of Vapour))/(Surface Tension))^0.5)*(((Specific Heat of Liquid*Excess Temperature)/(Constant in nucleate boiling*Change in Enthalpy of Vaporization*(Prandtl Number)^1.7))^3.0)

Enthalpy of evaporation to nucleate pool boiling

Go Change in Enthalpy of Vaporization = ((1/Heat Flux)*Dynamic Viscosity of Fluid*(([g]*(Density of Liquid-Density of Vapour))/(Surface Tension))^0.5*((Specific Heat of Liquid*Excess Temperature)/(Constant in nucleate boiling*(Prandtl Number)^1.7))^3)^0.5

Enthalpy of evaporation given critical heat flux

Go Change in Enthalpy of Vaporization = Critical Heat Flux/(0.18*Density of Vapour*(((Surface Tension*[g]*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25))

Critical heat flux to nucleate pool boiling

Go Critical Heat Flux = 0.18*Change in Enthalpy of Vaporization*Density of Vapour*((Surface Tension*[g]*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25

Heat transfer coefficient due to radiation for horizontal tubes

Go Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature))

Emissivity given heat transfer coefficient by radiation

Go Emissivity = Heat Transfer Coefficient by Radiation/([Stefan-BoltZ]*((Wall Temperature^4-Saturation Temperature^4)/(Wall Temperature-Saturation Temperature)))

Heat transfer coefficient by radiation

Go Heat Transfer Coefficient by Radiation = (Heat Transfer Coefficient by Boiling-Heat Transfer Coefficient by Convection)/0.75

Heat transfer coefficient in film boiling

Go Heat Transfer Coefficient by Boiling = Heat Transfer Coefficient by Convection+0.75*Heat Transfer Coefficient by Radiation

Heat transfer coefficient for convection

Go Heat Transfer Coefficient by Convection = Heat Transfer Coefficient by Boiling-0.75*Heat Transfer Coefficient by Radiation

Heat transfer coefficient due to radiation for horizontal tubes Formula

What is boiling

Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.

How to Calculate Heat transfer coefficient due to radiation for horizontal tubes?

Heat transfer coefficient due to radiation for horizontal tubes calculator uses Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature)) to calculate the Heat Transfer Coefficient by Radiation, The Heat transfer coefficient due to radiation for horizontal tubes formula is defined as the heat transferred per unit area per kelvin. Heat Transfer Coefficient by Radiation is denoted by h_r symbol.

How to calculate Heat transfer coefficient due to radiation for horizontal tubes using this online calculator? To use this online calculator for Heat transfer coefficient due to radiation for horizontal tubes, enter Emissivity (ε), Wall Temperature (T_w) & Saturation Temperature (T_s) and hit the calculate button. Here is how the Heat transfer coefficient due to radiation for horizontal tubes calculation can be explained with given input values -> 1.5 = [Stefan-BoltZ]*0.406974*(((300^4)-(200^4))/(300-200)).

FAQ

What is Heat transfer coefficient due to radiation for horizontal tubes?

The Heat transfer coefficient due to radiation for horizontal tubes formula is defined as the heat transferred per unit area per kelvin and is represented as h_r = [Stefan-BoltZ]*ε*(((T_w^4)-(T_s^4))/(T_w-T_s)) or Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature)). Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95, Wall Temperature is the temperature at the wall & Saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase.

How to calculate Heat transfer coefficient due to radiation for horizontal tubes?

The Heat transfer coefficient due to radiation for horizontal tubes formula is defined as the heat transferred per unit area per kelvin is calculated using Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature)). To calculate Heat transfer coefficient due to radiation for horizontal tubes, you need Emissivity (ε), Wall Temperature (T_w) & Saturation Temperature (T_s). With our tool, you need to enter the respective value for Emissivity, Wall Temperature & Saturation Temperature 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 Heat Transfer Coefficient by Radiation?

In this formula, Heat Transfer Coefficient by Radiation uses Emissivity, Wall Temperature & Saturation Temperature. We can use 1 other way(s) to calculate the same, which is/are as follows -

Heat Transfer Coefficient by Radiation = (Heat Transfer Coefficient by Boiling-Heat Transfer Coefficient by Convection)/0.75

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