How to Use the Psychrometric Chart Calculator?

1. Input Parameters
The calculator requires at least two known parameters to calculate the remaining properties. Start by entering the Dry Bulb Temperature, which is the air temperature measured by a standard thermometer. This is the only mandatory input.

Then, provide one of the following:

• Wet Bulb Temperature: The temperature read by a thermometer covered with a wet cloth exposed to airflow.
• Relative Humidity: The ratio of the partial pressure of water vapor to the saturation pressure at the given temperature, expressed as a percentage.
• Dew Point Temperature: The temperature at which water vapor starts to condense out of the air.

You can also adjust the Atmospheric Pressure if you’re working at non-standard conditions (default is set to 101.325 kPa, which is standard sea-level pressure).

2. Calculate
Once you’ve entered the required information, click the “Calculate” button. The tool will process the inputs and display the results.

3. Interpret Results
The calculator will provide the following outputs:

• Wet Bulb Temperature (if not provided as input)
• Relative Humidity (if not provided as input)
• Dew Point Temperature (if not provided as input)
• Humidity Ratio: The mass of water vapor per unit mass of dry air, expressed in grams of moisture per kilogram of dry air (g/kg)
• Enthalpy: The total heat content of the air, including both sensible and latent heat, measured in kilojoules per kilogram of dry air (kJ/kg)
• Specific Volume: The volume occupied by a unit mass of dry air, expressed in cubic meters per kilogram of dry air (m³/kg)

4. Analyze the Results
The tool provides a brief interpretation of the results, explaining what each property represents and how it relates to air conditioning and atmospheric processes. This information can help you understand the current state of the air and make informed decisions for HVAC design, energy calculations, or comfort analysis.

5. Consider Different Scenarios
The calculator is versatile and can be used for various applications. For example:

• Assessing indoor comfort conditions
• Calculating cooling and dehumidification loads
• Analyzing industrial drying processes
• Evaluating the performance of cooling towers
• Determining the potential for condensation in building envelopes

By following these steps, you can effectively use the Psychrometric Chart Calculator to analyze air properties for various applications in HVAC, building science, and environmental control.