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Psychrometric Calculator

The Psychrometric Calculator is a web-based tool designed to calculate various psychrometric properties, including:

  • Humidity Ratio (kg water/kg dry air)
  • Dew Point Temperature (°C)
  • Enthalpy (kJ/kg dry air)
  • Specific Volume (m³/kg dry air)
  • Relative Humidity (%)

This tool uses Dry-Bulb Temperature along with either Relative Humidity or Wet-Bulb Temperature as inputs.

Features

1. Input Options

You can input:

  • Dry-Bulb Temperature (°C): Required for all calculations.
  • Relative Humidity (%): Optionally provided if Wet-Bulb Temperature is not entered.
  • Wet-Bulb Temperature (°C): Optionally provided if Relative Humidity is not entered.
  • Atmospheric Pressure (kPa): Defaults to 101.325 kPa if left blank.

2. Conditional Input

  • If you enter a value for Relative Humidity, the Wet-Bulb Temperature field is disabled.
  • If you enter a value for Wet-Bulb Temperature, the Relative Humidity field is disabled.

3. Real-Time Calculations

The calculator computes psychrometric properties based on standard formulas and displays the results in an intuitive format.

4. Responsive Design

The calculator is designed for usability on both desktop and mobile devices.

How to Use

  1. Open the HTML file in any modern web browser.
  2. Enter the required inputs:
    • Dry-Bulb Temperature (°C)
    • Either Relative Humidity (%) or Wet-Bulb Temperature (°C)
    • Optionally adjust Atmospheric Pressure (kPa)
  3. Click the Calculate button.
  4. View the results under the "Results" section, including:
    • Humidity Ratio
    • Dew Point Temperature
    • Enthalpy
    • Specific Volume
    • Relative Humidity (calculated if Wet-Bulb Temperature is provided).

Installation

  1. Clone or download this repository.
  2. Locate the psychrometric_calculator.html file.
  3. Open the file in a modern web browser (e.g., Chrome, Firefox, Edge).

Formulas Used

  1. Saturation Pressure
  2. Humidity Ratio
  3. Relative Humidity from Wet-Bulb Temperature
  4. Dew Point Temperature
  5. Enthalpy
  6. Specific Volume

Technologies Used

  • HTML: For the structure of the web application.
  • CSS: For styling the user interface.
  • JavaScript: For performing calculations and managing interactivity.

Future Enhancements

  • Add graphing capabilities to visualize psychrometric properties.
  • Expand to support additional inputs like specific humidity and absolute humidity.
  • Add unit conversion options (e.g., imperial units).

License

This project is licensed under the MIT License. You are free to use, modify, and distribute this tool as needed.

Acknowledgments

Special thanks to the open-source community for providing psychrometric formulas and supporting resources for thermodynamic calculations.