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Enthalpy of evaporation in dehumidification Calculator

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✖Liquid Phase Heat Transfer Coefficient is the heat transfer in liquid per unit area in kelvin.ⓘ Liquid Phase Heat Transfer Coefficient [h1]			+10% -10%
✖Temperature at inner surface is the temperature value at the inner surface of the wall.ⓘ Temperature at inner surface [Ti]			+10% -10%
✖Liquid layer temperature is defined as the temperature of the flowing liquid layer in dehumidification.ⓘ Liquid layer temperature [Tl]			+10% -10%
✖Gas Phase Heat Transfer Coefficient is the heat transfer in gas per unit area in kelvin.ⓘ Gas Phase Heat Transfer Coefficient [hg]			+10% -10%
✖Bulk gas temperature is adiabatic mixing of the gas from a given cross section of duct will result in some equilibrium temperature that accurately reflects average temperature of the moving fluid.ⓘ Bulk Gas Temperature [Tg]			+10% -10%
✖Gas phase mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration change as driving force.ⓘ Gas Phase Mass Transfer Coefficient [k_y]			+10% -10%
✖Absolute Humidity of Air(tg) at the initial air temperature.ⓘ Absolute Humidity of Air(tg) [Yg]			+10% -10%
✖Absolute humidity (ti) is the quality of water vapor in the wet air of unit volume at temperature ti.ⓘ Absolute Humidity (ti) [Yi]			+10% -10%

✖Enthalpy of evaporation is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.ⓘ Enthalpy of evaporation in dehumidification [hfg]

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Enthalpy of evaporation in dehumidification Solution

STEP 0: Pre-Calculation Summary

Formula Used

Enthalpy of Evaporation = ((Liquid Phase Heat Transfer Coefficient*(Temperature at inner surface-Liquid layer temperature))-Gas Phase Heat Transfer Coefficient*(Bulk Gas Temperature-Temperature at inner surface))/(Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti)))
hfg = ((h1*(Ti-Tl))-hg*(Tg-Ti))/(k_y*(Yg-Yi))
This formula uses 9 Variables

Variables Used

Enthalpy of Evaporation - (Measured in Joule per Kilogram K) - Enthalpy of evaporation is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.
Liquid Phase Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Liquid Phase Heat Transfer Coefficient is the heat transfer in liquid per unit area in kelvin.
Temperature at inner surface - Temperature at inner surface is the temperature value at the inner surface of the wall.
Liquid layer temperature - Liquid layer temperature is defined as the temperature of the flowing liquid layer in dehumidification.
Gas Phase Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Gas Phase Heat Transfer Coefficient is the heat transfer in gas per unit area in kelvin.
Bulk Gas Temperature - Bulk gas temperature is adiabatic mixing of the gas from a given cross section of duct will result in some equilibrium temperature that accurately reflects average temperature of the moving fluid.
Gas Phase Mass Transfer Coefficient - (Measured in Mole per Second Square Meter) - Gas phase mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration change as driving force.
Absolute Humidity of Air(tg) - Absolute Humidity of Air(tg) at the initial air temperature.
Absolute Humidity (ti) - Absolute humidity (ti) is the quality of water vapor in the wet air of unit volume at temperature ti.

STEP 1: Convert Input(s) to Base Unit

Liquid Phase Heat Transfer Coefficient: 10.8 Watt per Square Meter per Kelvin --> 10.8 Watt per Square Meter per Kelvin No Conversion Required
Temperature at inner surface: 30 --> No Conversion Required
Liquid layer temperature: 20 --> No Conversion Required
Gas Phase Heat Transfer Coefficient: 40 Watt per Square Meter per Kelvin --> 40 Watt per Square Meter per Kelvin No Conversion Required
Bulk Gas Temperature: 100 --> No Conversion Required
Gas Phase Mass Transfer Coefficient: 90 Mole per Second Square Meter --> 90 Mole per Second Square Meter No Conversion Required
Absolute Humidity of Air(tg): 16 --> No Conversion Required
Absolute Humidity (ti): 50.7 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

hfg = ((h1*(Ti-Tl))-hg*(Tg-Ti))/(k_y*(Yg-Yi)) --> ((10.8*(30-20))-40*(100-30))/(90*(16-50.7))

Evaluating ... ...

hfg = 0.86199167467179

STEP 3: Convert Result to Output's Unit

0.86199167467179 Joule per Kilogram K --> No Conversion Required

FINAL ANSWER

0.86199167467179 ≈ 0.861992 Joule per Kilogram K <-- Enthalpy of Evaporation

(Calculation completed in 00.004 seconds)

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Created by Nishan Poojary

Shri Madhwa Vadiraja Institute of Technology and Management (SMVITM), Udupi

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< Humidification Calculators

Gas phase heat transfer coefficient in dehumidification

LaTeX Go Gas Phase Heat Transfer Coefficient = ((Liquid Phase Heat Transfer Coefficient*(Inside Temperature-Liquid layer temperature))-(Enthalpy of Evaporation*Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti))))/(Bulk Gas Temperature-Inside Temperature)

Liquid layer temperature in dehumidification

LaTeX Go Liquid layer temperature = Inside Temperature-(((Gas Phase Heat Transfer Coefficient*(Bulk Gas Temperature-Inside Temperature))+Enthalpy of Evaporation*Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti)))/Liquid Phase Heat Transfer Coefficient)

Convective mass transfer coefficient in humidification

LaTeX Go Convective Mass Transfer Coefficient = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*(Partial Pressure-Partial Pressure in air))

Enthalpy of evaporation for water in humidification

LaTeX Go Enthalpy of Evaporation = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Convective Mass Transfer Coefficient*(Partial Pressure-Partial Pressure in air))

Enthalpy of evaporation in dehumidification Formula

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What is humidification?

Humidification is the process in which the moisture or water vapor or humidity is added to the air. Common equipment used in this process is a humidifier. Dehumidification as the term suggests, is the opposite of humidification since dehumidification means removing the moisture from the air. Common equipment used in this process is a dehumidifier.
Humidity is the presence of water vapor or moisture in the air, while relative humidity, on the other hand, is the comparison of the actual moisture or water vapor in the air vs. the total water vapor or moisture that the air can handle.

How to Calculate Enthalpy of evaporation in dehumidification?

Enthalpy of evaporation in dehumidification calculator uses Enthalpy of Evaporation = ((Liquid Phase Heat Transfer Coefficient*(Temperature at inner surface-Liquid layer temperature))-Gas Phase Heat Transfer Coefficient*(Bulk Gas Temperature-Temperature at inner surface))/(Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti))) to calculate the Enthalpy of Evaporation, The Enthalpy of evaporation in dehumidification formula is defined as the amount of heat required for the liquid to change its state to gas. Enthalpy of Evaporation is denoted by hfg symbol.

How to calculate Enthalpy of evaporation in dehumidification using this online calculator? To use this online calculator for Enthalpy of evaporation in dehumidification, enter Liquid Phase Heat Transfer Coefficient (h1), Temperature at inner surface (Ti), Liquid layer temperature (Tl), Gas Phase Heat Transfer Coefficient (hg), Bulk Gas Temperature (Tg), Gas Phase Mass Transfer Coefficient (k_y), Absolute Humidity of Air(tg) (Yg) & Absolute Humidity (ti) (Yi) and hit the calculate button. Here is how the Enthalpy of evaporation in dehumidification calculation can be explained with given input values -> 0.861992 = ((10.8*(30-20))-40*(100-30))/(90*(16-50.7)).

FAQ

What is Enthalpy of evaporation in dehumidification?

The Enthalpy of evaporation in dehumidification formula is defined as the amount of heat required for the liquid to change its state to gas and is represented as hfg = ((h1*(Ti-Tl))-hg*(Tg-Ti))/(k_y*(Yg-Yi)) or Enthalpy of Evaporation = ((Liquid Phase Heat Transfer Coefficient*(Temperature at inner surface-Liquid layer temperature))-Gas Phase Heat Transfer Coefficient*(Bulk Gas Temperature-Temperature at inner surface))/(Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti))). Liquid Phase Heat Transfer Coefficient is the heat transfer in liquid per unit area in kelvin, Temperature at inner surface is the temperature value at the inner surface of the wall, Liquid layer temperature is defined as the temperature of the flowing liquid layer in dehumidification, Gas Phase Heat Transfer Coefficient is the heat transfer in gas per unit area in kelvin, Bulk gas temperature is adiabatic mixing of the gas from a given cross section of duct will result in some equilibrium temperature that accurately reflects average temperature of the moving fluid, Gas phase mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration change as driving force, Absolute Humidity of Air(tg) at the initial air temperature & Absolute humidity (ti) is the quality of water vapor in the wet air of unit volume at temperature ti.

How to calculate Enthalpy of evaporation in dehumidification?

The Enthalpy of evaporation in dehumidification formula is defined as the amount of heat required for the liquid to change its state to gas is calculated using Enthalpy of Evaporation = ((Liquid Phase Heat Transfer Coefficient*(Temperature at inner surface-Liquid layer temperature))-Gas Phase Heat Transfer Coefficient*(Bulk Gas Temperature-Temperature at inner surface))/(Gas Phase Mass Transfer Coefficient*(Absolute Humidity of Air(tg)-Absolute Humidity (ti))). To calculate Enthalpy of evaporation in dehumidification, you need Liquid Phase Heat Transfer Coefficient (h1), Temperature at inner surface (Ti), Liquid layer temperature (Tl), Gas Phase Heat Transfer Coefficient (hg), Bulk Gas Temperature (Tg), Gas Phase Mass Transfer Coefficient (k_y), Absolute Humidity of Air(tg) (Yg) & Absolute Humidity (ti) (Yi). With our tool, you need to enter the respective value for Liquid Phase Heat Transfer Coefficient, Temperature at inner surface, Liquid layer temperature, Gas Phase Heat Transfer Coefficient, Bulk Gas Temperature, Gas Phase Mass Transfer Coefficient, Absolute Humidity of Air(tg) & Absolute Humidity (ti) 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 Enthalpy of Evaporation?

In this formula, Enthalpy of Evaporation uses Liquid Phase Heat Transfer Coefficient, Temperature at inner surface, Liquid layer temperature, Gas Phase Heat Transfer Coefficient, Bulk Gas Temperature, Gas Phase Mass Transfer Coefficient, Absolute Humidity of Air(tg) & Absolute Humidity (ti). We can use 2 other way(s) to calculate the same, which is/are as follows -

Enthalpy of Evaporation = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Convective Mass Transfer Coefficient*(Partial Pressure-Partial Pressure in air))
Enthalpy of Evaporation = (Specific Heat of Air*(Lewis Number^0.67))/((Absolute Humidity of Air(tw)-Absolute Humidity of Air(atm))/(Air Temperature-Wet Bulb Temperature))

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