Air Enthalpy Calculator

Air Enthalpy Calculator is a useful online tool that helps professionals in the HVAC industry to calculate the enthalpy of air. With this easy-to-use calculator, you can quickly and accurately determine the amount of energy that is stored in the air by taking into account both its temperature and humidity. This information is critical in designing systems that control the temperature and humidity of indoor spaces. Using the calculator is easy. Simply input the temperature and relative humidity of the air you wish to analyze, and the calculator will do the rest. It will display the enthalpy in multiple units, allowing you to choose the one that makes the most sense for your particular application. Whether you're a heating, ventilation, and air conditioning engineer, an architect, or a building owner, the Air Enthalpy Calculator can be an invaluable tool in helping you design and maintain optimal indoor environments. So, why not give it a try and see how it can help you?

Air Enthalpy Calculator

Calculate the enthalpy of air

Air Enthalpy Calculator Results
Relative Humidity:0

Analyze air properties with our air enthalpy calculator. To calculate specific enthalpy, check out our specific enthalpy calculator.

How to Use the Air Enthalpy Calculator

The Air Enthalpy Calculator is a useful tool for calculating the enthalpy of air. Enthalpy is a thermodynamic property that measures the total energy content of a substance, taking into account both its internal energy and the work required to change its volume. Understanding the enthalpy of air is essential in various fields, including HVAC (Heating, Ventilation, and Air Conditioning), meteorology, and industrial processes.

Instructions for Utilizing the Calculator:

To use the Air Enthalpy Calculator, follow these steps:

  • Temperature: Enter the air temperature in degrees Celsius. Temperature is a crucial input parameter as it directly affects the enthalpy calculation. Different temperatures have varying effects on air properties.
  • Relative Humidity: Provide the relative humidity of the air in percentage. Relative humidity represents the amount of moisture present in the air compared to the maximum amount it can hold at a given temperature. Humidity influences the amount of water vapor in the air, which impacts the enthalpy value.

After entering the required input values, click the Calculate Enthalpy button. The calculator will perform the necessary calculations based on the provided data.

Output Fields and Interpretations

The Air Enthalpy Calculator provides the following output fields:

  • Temperature: Displays the input temperature value you entered.
  • Relative Humidity: Shows the input relative humidity value you provided.
  • Enthalpy: Presents the calculated enthalpy value of the air. Enthalpy is expressed in units of energy per unit mass (e.g., Joules per kilogram or BTUs per pound). It represents the total heat content of the air, including the sensible heat (related to the temperature) and the latent heat (associated with the moisture content).

Air Enthalpy Calculator Formula:

The formula used by the Air Enthalpy Calculator is as follows:

Enthalpy = 1.006 * Temperature + (0.622 * Actual Vapor Pressure)

Explanation of the Formula:

The formula calculates the enthalpy of air based on the input temperature and relative humidity. It involves two key components:

  • Saturated Vapor Pressure: It represents the maximum amount of water vapor the air can hold at a particular temperature. The formula uses the equation:

Saturated Vapor Pressure = 0.611 * exp((17.27 * temperature) / (temperature + 237.7)).

  • Actual Vapor Pressure: It is the vapor pressure of the water vapor present in the air, considering the relative humidity. The formula calculates the actual vapor pressure as:

Actual Vapor Pressure = (humidity / 100) * saturated Vapor Pressure.

The enthalpy is then determined by combining the sensible heat component (1.006 * Temperature) and the latent heat component (0.622 * Actual Vapor Pressure).

Illustrative Example:

Let's take an example to illustrate the usage of the Air Enthalpy Calculator. Suppose we have an air temperature of 25°C and a relative humidity of 50%.

Using the formula:

  • Saturated Vapor Pressure = 0.611 * exp((17.27 * 25) / (25 + 237.7))
  • Saturated Vapor Pressure = 3.169 kPa
  • Actual Vapor Pressure = (50 / 100) * 3.169
  • Actual Vapor Pressure = 1.585 kPa
  • Enthalpy = 1.006 * 25 + (0.622 * 1.585)
  • Enthalpy = 26.59 kJ/kg

Therefore, for the given temperature and relative humidity, the enthalpy of the air is calculated as 26.59 kJ/kg.

Table Example

Temperature (°C)Relative Humidity (%)Enthalpy (kJ/kg)

In conclusion, the "Air Enthalpy Calculator" is a valuable tool for calculating the enthalpy of air. By providing the air temperature and relative humidity, you can determine the enthalpy, which represents the total heat content of the air. This information is crucial in various fields, including HVAC systems, weather forecasting, and industrial processes.

Understanding the enthalpy of air helps in designing efficient heating and cooling systems, predicting and analyzing weather patterns, and optimizing industrial processes that involve air handling and conditioning.

By utilizing the "Air Enthalpy Calculator," you can easily obtain accurate enthalpy values, enabling you to make informed decisions and calculations in your respective field of application. Whether you are an HVAC engineer, meteorologist, or involved in industrial processes, the calculator empowers you to consider the energy content of the air and make appropriate adjustments or estimations.

Make the most of the "Air Enthalpy Calculator" and leverage its capabilities to enhance your understanding and optimize your work processes related to air handling, conditioning, and energy calculations.

About the Author

Author Image

Zayan Chowdhury
Theoretical physicist

Zayan Chowdhury is a theoretical physicist with a passion for exploring the fundamental laws of the universe. He is deeply interested in understanding the nature of dark matter and dark energy, and how they influence the evolution of the cosmos. Zayan has published several papers on topics ranging from black hole thermodynamics to quantum gravity, and his work has been recognized by leading physicists in the field. In his free time, Zayan enjoys reading philosophy and exploring the great outdoors.