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Wet Bulb Temperature Formula

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Wet bulb temperature is the lowest temperature attainable by evaporating water into air at constant pressure. Check FAQs

T W = T G - (Y W' - Y A) \cdot (\frac{k Y' \cdot λ W}{h G})

T_W - Wet Bulb Temperature?T_G - Temperature of Air?Y_W' - Air Humidity at Wet Bulb Temperature?Y_A - Ambient Air Humidity?k_Y' - Mass Transfer Coefficient of the Moisture?λ_W - Heat of Vaporization at Wet Bulb Temperature?h_G - Heat Transfer Coefficient of the Air Film?

Wet Bulb Temperature Example

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With units

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Here is how the Wet Bulb Temperature equation looks like with Values.

Here is how the Wet Bulb Temperature equation looks like with Units.

Here is how the Wet Bulb Temperature equation looks like.

21.5541 = 30 - (0.021 - 0.016) \cdot (\frac{0.01 \cdot 2250}{13.32})

21.5541°C = 30°C - (0.021kg/kg of air - 0.016kg/kg of air) \cdot (\frac{0.01mol/s*m² \cdot 2250kJ/kg}{13.32W/m²*K})

21.5541 = 30 - (0.021 - 0.016) \cdot (\frac{0.01 \cdot 2250}{13.32})

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Wet Bulb Temperature Solution

Follow our step by step solution on how to calculate Wet Bulb Temperature?

FIRST Step Consider the formula

T W = T G - (Y W' - Y A) \cdot (\frac{k Y' \cdot λ W}{h G})

Next Step Substitute values of Variables

∴

T W = 30°C - (0.021kg/kg of air - 0.016kg/kg of air) \cdot (\frac{0.01mol/s*m² \cdot 2250kJ/kg}{13.32W/m²*K})

Next Step Convert Units

∴

T W = 303.15K - (0.021kg/kg of air - 0.016kg/kg of air) \cdot (\frac{0.01mol/s*m² \cdot 2.3E+6J/kg}{13.32W/m²*K})

Next Step Prepare to Evaluate

∴

T W = 303.15 - (0.021 - 0.016) \cdot (\frac{0.01 \cdot 2.3E+6}{13.32})

Next Step Evaluate

∴

T W = 294.704054054054K

Next Step Convert to Output's Unit

∴

T W = 21.5540540540541°C

LAST Step Rounding Answer

∴

T W = 21.5541°C

Wet Bulb Temperature Formula Elements

Variables

Wet Bulb Temperature

Wet bulb temperature is the lowest temperature attainable by evaporating water into air at constant pressure.

Symbol: T_W

Measurement: TemperatureUnit: °C

Note: Value should be greater than -273.15.

Formulas to find Wet Bulb Temperature

Open Variable

Temperature of Air

The Temperature of Air is defined as the temperature at which the air-water mixture properties in humidification are calculated.

Symbol: T_G

Measurement: TemperatureUnit: °C

Note: Value should be greater than -273.15.

Formulas to find Temperature of Air

Open Variable

Air Humidity at Wet Bulb Temperature

Air humidity at Wet Bulb Temperature refers to the moisture content present in the surrounding air at a given location at the Wet Bulb temperature.

Symbol: Y_W'

Measurement: Specific HumidityUnit: kg/kg of air

Note: Value should be greater than 0.

Formulas to find Air Humidity at Wet Bulb Temperature

Open Variable

Ambient Air Humidity

Ambient air humidity refers to the moisture content present in the surrounding air at a given location an temperature.

Symbol: Y_A

Measurement: Specific HumidityUnit: kg/kg of air

Note: Value should be greater than 0.

Formulas to find Ambient Air Humidity

Open Variable

Mass Transfer Coefficient of the Moisture

Mass Transfer Coefficient of the Moisture is the proportionality factor between the mass transfer rate and the concentration driving force.

Symbol: k_Y'

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

Note: Value should be greater than 0.

Formulas to find Mass Transfer Coefficient of the Moisture

Open Variable

Heat of Vaporization at Wet Bulb Temperature

The heat of vaporization at wet bulb temperature is the energy required per unit mass to convert liquid water into vapor at the wet bulb temperature of the gas liquid mixture.

Symbol: λ_W

Measurement: Latent HeatUnit: kJ/kg

Note: Value should be greater than 0.

Formulas to find Heat of Vaporization at Wet Bulb Temperature

Open Variable

Heat Transfer Coefficient of the Air Film

Heat Transfer Coefficient of the Air Film is the proportionality factor between the heat transfer rate and the temperature driving force.

Symbol: h_G

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value should be greater than 0.

Formulas to find Heat Transfer Coefficient of the Air Film

Open Variable

Other formulas in Adiabatic Saturation Temperature and Wet Bulb Temperature category

Go Adiabatic Saturation Temperature

T S = T G - (Y S' - Y') \cdot (\frac{λ S}{C s})

Go Air Inlet Temperature based on Adiabatic Saturation Temperature

T G = (Y S' - Y') \cdot (\frac{λ S}{C s}) + T S

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How to Evaluate Wet Bulb Temperature?

Wet Bulb Temperature evaluator uses Wet Bulb Temperature = Temperature of Air-(Air Humidity at Wet Bulb Temperature-Ambient Air Humidity)*((Mass Transfer Coefficient of the Moisture*Heat of Vaporization at Wet Bulb Temperature)/Heat Transfer Coefficient of the Air Film) to evaluate the Wet Bulb Temperature, The Wet Bulb Temperature formula is defined as the lowest temperature of air that is possible if water if added at constant pressure in air-water mixture. Wet Bulb Temperature is denoted by T_W symbol.

How to evaluate Wet Bulb Temperature using this online evaluator? To use this online evaluator for Wet Bulb Temperature, enter Temperature of Air (T_G), Air Humidity at Wet Bulb Temperature (Y_W'), Ambient Air Humidity (Y_A), Mass Transfer Coefficient of the Moisture (k_Y'), Heat of Vaporization at Wet Bulb Temperature (λ_W) & Heat Transfer Coefficient of the Air Film (h_G) and hit the calculate button.

FAQs on Wet Bulb Temperature

What is the formula to find Wet Bulb Temperature?

The formula of Wet Bulb Temperature is expressed as Wet Bulb Temperature = Temperature of Air-(Air Humidity at Wet Bulb Temperature-Ambient Air Humidity)*((Mass Transfer Coefficient of the Moisture*Heat of Vaporization at Wet Bulb Temperature)/Heat Transfer Coefficient of the Air Film). Here is an example- -243.158446 = 303.15-(0.021-0.016)*((0.01*2250000)/13.32).

How to calculate Wet Bulb Temperature?

With Temperature of Air (T_G), Air Humidity at Wet Bulb Temperature (Y_W'), Ambient Air Humidity (Y_A), Mass Transfer Coefficient of the Moisture (k_Y'), Heat of Vaporization at Wet Bulb Temperature (λ_W) & Heat Transfer Coefficient of the Air Film (h_G) we can find Wet Bulb Temperature using the formula - Wet Bulb Temperature = Temperature of Air-(Air Humidity at Wet Bulb Temperature-Ambient Air Humidity)*((Mass Transfer Coefficient of the Moisture*Heat of Vaporization at Wet Bulb Temperature)/Heat Transfer Coefficient of the Air Film).

Can the Wet Bulb Temperature be negative?

Yes, the Wet Bulb Temperature, measured in Temperature can be negative.

Which unit is used to measure Wet Bulb Temperature?

Wet Bulb Temperature is usually measured using the Celsius[°C] for Temperature. Kelvin[°C], Fahrenheit[°C], Rankine[°C] are the few other units in which Wet Bulb Temperature can be measured.

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