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Partial pressure of water vapor in air Calculator

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✖Partial pressure of the water vapor at wet bulb temperature.ⓘ Partial Pressure [Pw]			+10% -10%
✖Convective Heat Transfer Coefficient is the heat transfer due to convection.ⓘ Convective Heat Transfer Coefficient [h_Conv]			+10% -10%
✖Air temperature is the temperature of the air surrounding an individual and is typically measured in degrees Celsius (°C) or in Kelvin.ⓘ Air Temperature [T∞]			+10% -10%
✖Wet Bulb Temperature is the temperature of the wet bulb and denoted by the symbol Tw.ⓘ Wet Bulb Temperature [T_w]			+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 [hfg]			+10% -10%
✖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.ⓘ Convective Mass Transfer Coefficient [k_L]			+10% -10%

✖Partial pressure in air of the water vapor is the pressure of water in the mixture of water and air.ⓘ Partial pressure of water vapor in air [P∞]

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Formula

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Partial pressure of water vapor in air

Formula

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

Example

0.719298 = 13 - (\frac{0.5 W/m²*K \cdot (35 - 14)}{90 J/kg*K \cdot 9.5e-3 m/s})

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Partial pressure of water vapor in air Solution

STEP 0: Pre-Calculation Summary

Formula Used

Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient))
P∞ = Pw-((h_Conv*(T∞-T_w))/(hfg*k_L))
This formula uses 7 Variables

Variables Used

Partial Pressure in air - Partial pressure in air of the water vapor is the pressure of water in the mixture of water and air.
Partial Pressure - Partial pressure of the water vapor at wet bulb temperature.
Convective Heat Transfer Coefficient - (Measured in Watt per Square Meter per Kelvin) - Convective Heat Transfer Coefficient is the heat transfer due to convection.
Air Temperature - Air temperature is the temperature of the air surrounding an individual and is typically measured in degrees Celsius (°C) or in Kelvin.
Wet Bulb Temperature - Wet Bulb Temperature is the temperature of the wet bulb and denoted by the symbol Tw.
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.
Convective Mass Transfer Coefficient - (Measured in Meter per Second) - 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.

STEP 1: Convert Input(s) to Base Unit

Partial Pressure: 13 --> No Conversion Required
Convective Heat Transfer Coefficient: 0.5 Watt per Square Meter per Kelvin --> 0.5 Watt per Square Meter per Kelvin No Conversion Required
Air Temperature: 35 --> No Conversion Required
Wet Bulb Temperature: 14 --> No Conversion Required
Enthalpy of Evaporation: 90 Joule per Kilogram K --> 90 Joule per Kilogram K No Conversion Required
Convective Mass Transfer Coefficient: 0.0095 Meter per Second --> 0.0095 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P∞ = Pw-((h_Conv*(T∞-T_w))/(hfg*k_L)) --> 13-((0.5*(35-14))/(90*0.0095))

Evaluating ... ...

P∞ = 0.719298245614034

STEP 3: Convert Result to Output's Unit

0.719298245614034 --> No Conversion Required

FINAL ANSWER

0.719298245614034 ≈ 0.719298 <-- Partial Pressure in air

(Calculation completed in 00.020 seconds)

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Created by Nishan Poojary

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

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University Institute of Technology RGPV (UIT - RGPV), Bhopal

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< Humidification Calculators

Gas phase heat transfer coefficient in dehumidification

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

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

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

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

Partial pressure of water vapor in air Formula

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 Partial pressure of water vapor in air?

Partial pressure of water vapor in air calculator uses Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)) to calculate the Partial Pressure in air, Partial pressure of water vapor in air formula is defined as the partial pressure of the water vapor in the air as calculated from heat transfer coefficients. Partial Pressure in air is denoted by P∞ symbol.

How to calculate Partial pressure of water vapor in air using this online calculator? To use this online calculator for Partial pressure of water vapor in air, enter Partial Pressure (Pw), Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Enthalpy of Evaporation (hfg) & Convective Mass Transfer Coefficient (k_L) and hit the calculate button. Here is how the Partial pressure of water vapor in air calculation can be explained with given input values -> -0.815789 = 13-((0.5*(35-14))/(90*0.0095)).

FAQ

What is Partial pressure of water vapor in air?

Partial pressure of water vapor in air formula is defined as the partial pressure of the water vapor in the air as calculated from heat transfer coefficients and is represented as P∞ = Pw-((h_Conv*(T∞-T_w))/(hfg*k_L)) or Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)). Partial pressure of the water vapor at wet bulb temperature, Convective Heat Transfer Coefficient is the heat transfer due to convection, Air temperature is the temperature of the air surrounding an individual and is typically measured in degrees Celsius (°C) or in Kelvin, Wet Bulb Temperature is the temperature of the wet bulb and denoted by the symbol Tw, 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 & 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.

How to calculate Partial pressure of water vapor in air?

Partial pressure of water vapor in air formula is defined as the partial pressure of the water vapor in the air as calculated from heat transfer coefficients is calculated using Partial Pressure in air = Partial Pressure-((Convective Heat Transfer Coefficient*(Air Temperature-Wet Bulb Temperature))/(Enthalpy of Evaporation*Convective Mass Transfer Coefficient)). To calculate Partial pressure of water vapor in air, you need Partial Pressure (Pw), Convective Heat Transfer Coefficient (h_Conv), Air Temperature (T∞), Wet Bulb Temperature (T_w), Enthalpy of Evaporation (hfg) & Convective Mass Transfer Coefficient (k_L). With our tool, you need to enter the respective value for Partial Pressure, Convective Heat Transfer Coefficient, Air Temperature, Wet Bulb Temperature, Enthalpy of Evaporation & Convective Mass Transfer Coefficient 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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