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Enthalpy of evaporation in dehumidification Formula

GoEnthalpy of evaporation for water in humidification Formula

GoEnthalpy of evaporation of water in humidification Formula

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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. Check FAQs

hfg = \frac{(h1 \cdot (Ti - Tl)) - hg \cdot (Tg - Ti)}{k y \cdot (Yg - Yi)}

hfg - Enthalpy of Evaporation?h1 - Liquid Phase Heat Transfer Coefficient?Ti - Temperature at inner surface?Tl - Liquid layer temperature?hg - Gas Phase Heat Transfer Coefficient?Tg - Bulk Gas Temperature?k_y - Gas Phase Mass Transfer Coefficient?Yg - Absolute Humidity of Air(tg)?Yi - Absolute Humidity (ti)?

Enthalpy of evaporation in dehumidification Example

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Here is how the Enthalpy of evaporation in dehumidification equation looks like with Values.

Here is how the Enthalpy of evaporation in dehumidification equation looks like with Units.

Here is how the Enthalpy of evaporation in dehumidification equation looks like.

0.862 = \frac{(10.8 \cdot (30 - 20)) - 40 \cdot (100 - 30)}{90 \cdot (16 - 50.7)}

0.862J/kg*K = \frac{(10.8W/m²*K \cdot (30 - 20)) - 40W/m²*K \cdot (100 - 30)}{90mol/s*m² \cdot (16 - 50.7)}

0.862 = \frac{(10.8 \cdot (30 - 20)) - 40 \cdot (100 - 30)}{90 \cdot (16 - 50.7)}

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Enthalpy of evaporation in dehumidification Solution

Follow our step by step solution on how to calculate Enthalpy of evaporation in dehumidification?

FIRST Step Consider the formula

hfg = \frac{(h1 \cdot (Ti - Tl)) - hg \cdot (Tg - Ti)}{k y \cdot (Yg - Yi)}

Next Step Substitute values of Variables

∴

hfg = \frac{(10.8W/m²*K \cdot (30 - 20)) - 40W/m²*K \cdot (100 - 30)}{90mol/s*m² \cdot (16 - 50.7)}

Next Step Prepare to Evaluate

∴

hfg = \frac{(10.8 \cdot (30 - 20)) - 40 \cdot (100 - 30)}{90 \cdot (16 - 50.7)}

Next Step Evaluate

∴

hfg = 0.86199167467179J/kg*K

LAST Step Rounding Answer

∴

hfg = 0.862J/kg*K

Enthalpy of evaporation in dehumidification Formula Elements

Variables

Enthalpy of Evaporation

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.

Symbol: hfg

Measurement: Specific EntropyUnit: J/kg*K

Note: Value can be positive or negative.

Formulas to find Enthalpy of Evaporation

Liquid Phase Heat Transfer Coefficient

Liquid Phase Heat Transfer Coefficient is the heat transfer in liquid per unit area in kelvin.

Symbol: h1

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Liquid Phase Heat Transfer Coefficient

Temperature at inner surface

Temperature at inner surface is the temperature value at the inner surface of the wall.

Symbol: Ti

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Temperature at inner surface

Liquid layer temperature

Liquid layer temperature is defined as the temperature of the flowing liquid layer in dehumidification.

Symbol: Tl

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Liquid layer temperature

Gas Phase Heat Transfer Coefficient

Gas Phase Heat Transfer Coefficient is the heat transfer in gas per unit area in kelvin.

Symbol: hg

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Gas Phase Heat Transfer Coefficient

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.

Symbol: Tg

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Bulk Gas Temperature

Gas Phase Mass Transfer Coefficient

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.

Symbol: k_y

Measurement: Molar Flux of Diffusing ComponentUnit: mol/s*m²

Note: Value can be positive or negative.

Formulas to find Gas Phase Mass Transfer Coefficient

Absolute Humidity of Air(tg)

Absolute Humidity of Air(tg) at the initial air temperature.

Symbol: Yg

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Absolute Humidity of Air(tg)

Absolute Humidity (ti)

Absolute humidity (ti) is the quality of water vapor in the wet air of unit volume at temperature ti.

Symbol: Yi

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Absolute Humidity (ti)

Other Formulas to find Enthalpy of Evaporation

Go Enthalpy of evaporation for water in humidification

hfg = \frac{h Conv \cdot (T∞ - T w)}{k L \cdot (Pw - P∞)}

Go Enthalpy of evaporation of water in humidification

hfg = \frac{cp \cdot ({L e}^{0.67})}{\frac{Yw - Y∞}{T∞ - T w}}

Other formulas in Humidification category

Go Convective mass transfer coefficient in humidification

k L = \frac{h Conv \cdot (T∞ - T w)}{hfg \cdot (Pw - P∞)}

Go Liquid layer temperature in dehumidification

Tl = t i - (\frac{(hg \cdot (Tg - t i)) + hfg \cdot k y \cdot (Yg - Yi)}{h1})

How to Evaluate Enthalpy of evaporation in dehumidification?

Enthalpy of evaporation in dehumidification evaluator 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 evaluate 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 evaluate Enthalpy of evaporation in dehumidification using this online evaluator? To use this online evaluator 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.

FAQs on Enthalpy of evaporation in dehumidification

What is the formula to find Enthalpy of evaporation in dehumidification?

The formula of Enthalpy of evaporation in dehumidification is expressed as 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))). Here is an example- 0.861992 = ((10.8*(30-20))-40*(100-30))/(90*(16-50.7)).

How to calculate Enthalpy of evaporation in dehumidification?

With 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) we can find Enthalpy of evaporation in dehumidification using the formula - 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))).

What are the other ways to Calculate Enthalpy of Evaporation?

Here are the different ways to Calculate Enthalpy of Evaporation-

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))

Can the Enthalpy of evaporation in dehumidification be negative?

Yes, the Enthalpy of evaporation in dehumidification, measured in Specific Entropy can be negative.

Which unit is used to measure Enthalpy of evaporation in dehumidification?

Enthalpy of evaporation in dehumidification is usually measured using the Joule per Kilogram K[J/kg*K] for Specific Entropy. Calorie per Gram per Celcius[J/kg*K], Joule per Kilogram per Celcius[J/kg*K], Kilojoule per Kilogram per Celcius[J/kg*K] are the few other units in which Enthalpy of evaporation in dehumidification can be measured.

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Enthalpy of evaporation in dehumidification Formula

​GoEnthalpy of evaporation for water in humidification Formula

​GoEnthalpy of evaporation of water in humidification Formula

Enthalpy of evaporation in dehumidification Example

Enthalpy of evaporation in dehumidification Solution

Enthalpy of evaporation in dehumidification Formula Elements

Other Formulas to find Enthalpy of Evaporation

Other formulas in Humidification category

How to Evaluate Enthalpy of evaporation in dehumidification?

FAQs on Enthalpy of evaporation in dehumidification

Variable Name

GoEnthalpy of evaporation for water in humidification Formula

GoEnthalpy of evaporation of water in humidification Formula