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Enthalpy of evaporation for water in humidification Formula

GoEnthalpy of evaporation in dehumidification 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{h Conv \cdot (T∞ - T w)}{k L \cdot (Pw - P∞)}

hfg - Enthalpy of Evaporation?h_Conv - Convective Heat Transfer Coefficient?T∞ - Air Temperature?T_w - Wet Bulb Temperature?k_L - Convective Mass Transfer Coefficient?Pw - Partial Pressure?P∞ - Partial Pressure in air?

Enthalpy of evaporation for water in humidification Example

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Here is how the Enthalpy of evaporation for water in humidification equation looks like with Values.

Here is how the Enthalpy of evaporation for water in humidification equation looks like with Units.

Here is how the Enthalpy of evaporation for water in humidification equation looks like.

85.125 = \frac{0.5 \cdot (35 - 14)}{0.0095 \cdot (13 - 0.016)}

85.125J/kg*K = \frac{0.5W/m²*K \cdot (35 - 14)}{0.0095m/s \cdot (13 - 0.016)}

85.125 = \frac{0.5 \cdot (35 - 14)}{0.0095 \cdot (13 - 0.016)}

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Enthalpy of evaporation for water in humidification Solution

Follow our step by step solution on how to calculate Enthalpy of evaporation for water in humidification?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

hfg = \frac{0.5W/m²*K \cdot (35 - 14)}{0.0095m/s \cdot (13 - 0.016)}

Next Step Prepare to Evaluate

∴

hfg = \frac{0.5 \cdot (35 - 14)}{0.0095 \cdot (13 - 0.016)}

Next Step Evaluate

∴

hfg = 85.125012160716J/kg*K

LAST Step Rounding Answer

∴

hfg = 85.125J/kg*K

Enthalpy of evaporation for water in humidification 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

Convective Heat Transfer Coefficient

Convective Heat Transfer Coefficient is the heat transfer due to convection.

Symbol: h_Conv

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Formulas to find Convective Heat Transfer Coefficient

Air Temperature

Air temperature is the temperature of the air surrounding an individual and is typically measured in degrees Celsius (°C) or in Kelvin.

Symbol: T∞

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Air Temperature

Wet Bulb Temperature

Wet Bulb Temperature is the temperature of the wet bulb and denoted by the symbol Tw.

Symbol: T_w

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Wet Bulb Temperature

Convective Mass Transfer Coefficient

Convective Mass Transfer Coefficient is a function of geometry of the system and the velocity and properties of the fluid similar to the heat transfer coefficient.

Symbol: k_L

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Convective Mass Transfer Coefficient

Partial Pressure

Partial pressure of the water vapor at wet bulb temperature.

Symbol: Pw

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Partial Pressure

Partial Pressure in air

Partial pressure in air of the water vapor is the pressure of water in the mixture of water and air.

Symbol: P∞

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Partial Pressure in air

Other Formulas to find Enthalpy of Evaporation

Go Enthalpy of evaporation in dehumidification

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

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 for water in humidification?

Enthalpy of evaporation for water in humidification evaluator uses Enthalpy of Evaporation = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Convective Mass Transfer Coefficient*(Partial Pressure-Partial Pressure in air)) to evaluate the Enthalpy of Evaporation, The Enthalpy of evaporation for water in humidification formula is defined as the amount of heat energy required to change the state of water to gas. Enthalpy of Evaporation is denoted by hfg symbol.

How to evaluate Enthalpy of evaporation for water in humidification using this online evaluator? To use this online evaluator for Enthalpy of evaporation for water in humidification, enter Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Convective Mass Transfer Coefficient (k_L), Partial Pressure (Pw) & Partial Pressure in air (P∞) and hit the calculate button.

FAQs on Enthalpy of evaporation for water in humidification

What is the formula to find Enthalpy of evaporation for water in humidification?

The formula of Enthalpy of evaporation for water in humidification is expressed as Enthalpy of Evaporation = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Convective Mass Transfer Coefficient*(Partial Pressure-Partial Pressure in air)). Here is an example- 85.12501 = (0.5*(35-14))/(0.0095*(13-0.016)).

How to calculate Enthalpy of evaporation for water in humidification?

With Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Convective Mass Transfer Coefficient (k_L), Partial Pressure (Pw) & Partial Pressure in air (P∞) we can find Enthalpy of evaporation for water in humidification using the formula - Enthalpy of Evaporation = (Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Convective Mass Transfer Coefficient*(Partial Pressure-Partial Pressure in air)).

What are the other ways to Calculate Enthalpy of Evaporation?

Here are the different ways to Calculate Enthalpy of Evaporation-

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)))
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 for water in humidification be negative?

Yes, the Enthalpy of evaporation for water in humidification, measured in Specific Entropy can be negative.

Which unit is used to measure Enthalpy of evaporation for water in humidification?

Enthalpy of evaporation for water in humidification 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 for water in humidification can be measured.

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Enthalpy of evaporation for water in humidification Formula

​GoEnthalpy of evaporation in dehumidification Formula

​GoEnthalpy of evaporation of water in humidification Formula

Enthalpy of evaporation for water in humidification Example

Enthalpy of evaporation for water in humidification Solution

Enthalpy of evaporation for water in humidification Formula Elements

Other Formulas to find Enthalpy of Evaporation

Other formulas in Humidification category

How to Evaluate Enthalpy of evaporation for water in humidification?

FAQs on Enthalpy of evaporation for water in humidification

Variable Name

GoEnthalpy of evaporation in dehumidification Formula

GoEnthalpy of evaporation of water in humidification Formula