What is Enthalpy?
We will provide an easy-to-understand explanation of "enthalpy," which is important for understanding the close relationship between cooling capacity and dehumidification capacity.
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Enthalpy and psychrometric charts are essential knowledge for air conditioning.
In our daily lives, we casually use the terms cooling capacity and dehumidifying capacity of air conditioners.
Knowledge of concepts such as "enthalpy" and "psychrometric chart" is important in understanding the close relationship between cooling capacity and dehumidification capacity.
We will introduce basic knowledge about "enthalpy" so that even those who are not air conditioner engineers can understand it.
*The psychrometric chart contains numbers that represent the state of the air, such as enthalpy.
Enthalpy
This refers to the amount of heat (energy) contained in air, which is the combination of internal energy and the energy required for expansion and contraction (flow energy).
The unit is kJ.
*This represents all energy, including flow energy that does not remain as a temperature rise.
How to calculate enthalpy
Enthalpy [kJ] = Internal energy [kJ] + Pressure [kPa] × Volume [m3]
(flow energy)
specific enthalpy
The enthalpy per unit weight is called specific enthalpy. In other words, it expresses how many kJ of enthalpy there is per kg of dry air.
The unit is expressed in [kJ/kg(DA)].
air
This refers to moist air that contains water vapor. It is a familiar gas and is essential to our daily lives.
Humid air
What we normally call air is "humid air," a mixture of dry air and water vapor.
The state of "humid air" can be expressed in terms of "dry bulb temperature," "wet bulb temperature," "dew point temperature," "relative humidity," and "absolute humidity."
| An example of moist air classification | |
|---|---|
| classification | Content |
| saturated air | The limit of water vapor that air can contain |
| Unsaturated air | Air that has not yet reached saturated air |
| Frost-filled air | Water vapor in the air is made up of tiny water droplets |
| Snow-filled air | Water vapor in the air that exists as ice crystals |
The specific enthalpy of "humid air" is the sum of the enthalpy of 1 kg of "dry air" and the specific enthalpy of x kg of water vapor.
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