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Enthalpy of Moist Air Formula

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The Enthalpy of Moist Air is the sum of the enthalpy of the dry air and the enthalpy of the water vapour. Check FAQs

h = 1.005 \cdot t db + ω \cdot (2500 + 1.9 \cdot t db)

h - Enthalpy of Moist Air?t_db - Dry Bulb Temperature in °C?ω - Specific Humidity?

Enthalpy of Moist Air Example

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Here is how the Enthalpy of Moist Air equation looks like with Values.

Here is how the Enthalpy of Moist Air equation looks like with Units.

Here is how the Enthalpy of Moist Air equation looks like.

787.8 = 1.005 \cdot 110 + 0.25 \cdot (2500 + 1.9 \cdot 110)

787.8kJ/kg = 1.005 \cdot 110 + 0.25 \cdot (2500 + 1.9 \cdot 110)

787.8 = 1.005 \cdot 110 + 0.25 \cdot (2500 + 1.9 \cdot 110)

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Enthalpy of Moist Air Solution

Follow our step by step solution on how to calculate Enthalpy of Moist Air?

FIRST Step Consider the formula

h = 1.005 \cdot t db + ω \cdot (2500 + 1.9 \cdot t db)

Next Step Substitute values of Variables

∴

h = 1.005 \cdot 110 + 0.25 \cdot (2500 + 1.9 \cdot 110)

Next Step Prepare to Evaluate

∴

h = 1.005 \cdot 110 + 0.25 \cdot (2500 + 1.9 \cdot 110)

Next Step Evaluate

∴

h = 787800J/kg

LAST Step Convert to Output's Unit

∴

h = 787.8kJ/kg

Enthalpy of Moist Air Formula Elements

Variables

Enthalpy of Moist Air

The Enthalpy of Moist Air is the sum of the enthalpy of the dry air and the enthalpy of the water vapour.

Symbol: h

Measurement: Heat of Combustion (per Mass)Unit: kJ/kg

Note: Value can be positive or negative.

Formulas to find Enthalpy of Moist Air

Dry Bulb Temperature in °C

Dry Bulb Temperature in °C is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture.

Symbol: t_db

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Dry Bulb Temperature in °C

Specific Humidity

Specific Humidity is the ratio of the mass of water vapor to the total mass of the air parcel.

Symbol: ω

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Specific Humidity

Other formulas in Enthalpy of Air category

Go Work done during isentropic compression(per Kg of refrigerant)

w = h 2 - h 1

Go Refrigerating Effect(for given h1 and h4)

R E = h 1 - h 4

Go Refrigerating Effect given Enthalpy at Inlet of Compressor and Exit of Condenser

R E = h 1 - h f3

Go Coefficient of Performance given enthalpy of liquid refrigerant leaving condenser (hf3)

COP th = \frac{h 1 - h f3}{h 2 - h 1}

How to Evaluate Enthalpy of Moist Air?

Enthalpy of Moist Air evaluator uses Enthalpy of Moist Air = 1.005*Dry Bulb Temperature in °C+Specific Humidity*(2500+1.9*Dry Bulb Temperature in °C) to evaluate the Enthalpy of Moist Air, Enthalpy of Moist Air formula is defined as the total heat content of moist air per unit mass, which is a measure of the total energy of the air, including the energy associated with the temperature and humidity of the air. Enthalpy of Moist Air is denoted by h symbol.

How to evaluate Enthalpy of Moist Air using this online evaluator? To use this online evaluator for Enthalpy of Moist Air, enter Dry Bulb Temperature in °C (t_db) & Specific Humidity (ω) and hit the calculate button.

FAQs on Enthalpy of Moist Air

What is the formula to find Enthalpy of Moist Air?

The formula of Enthalpy of Moist Air is expressed as Enthalpy of Moist Air = 1.005*Dry Bulb Temperature in °C+Specific Humidity*(2500+1.9*Dry Bulb Temperature in °C). Here is an example- 0.7878 = 1.005*110+0.25*(2500+1.9*110).

How to calculate Enthalpy of Moist Air?

With Dry Bulb Temperature in °C (t_db) & Specific Humidity (ω) we can find Enthalpy of Moist Air using the formula - Enthalpy of Moist Air = 1.005*Dry Bulb Temperature in °C+Specific Humidity*(2500+1.9*Dry Bulb Temperature in °C).

Can the Enthalpy of Moist Air be negative?

Yes, the Enthalpy of Moist Air, measured in Heat of Combustion (per Mass) can be negative.

Which unit is used to measure Enthalpy of Moist Air?

Enthalpy of Moist Air is usually measured using the Kilojoule per Kilogram[kJ/kg] for Heat of Combustion (per Mass). Joule per Kilogram[kJ/kg], Calorie (IT) per Gram[kJ/kg] are the few other units in which Enthalpy of Moist Air can be measured.

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