Psychrometric Calculator

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CHEMIX School Psychrometric Calculator - Overview of the Window Layout

The Psychrometric Value Calculator window is organized into several sections for ease of use:

Upper Left Side: Dry Bulb/Wet Bulb Experiment - Step by Step
- This section provides a 4-step illustrated guide on how to conduct a Dry Bulb/Wet Bulb experiment.
- Lower Left Side: Calculate Psychrometric Value
This area contains:
- The calculator within the "Calculate Psychrometric Value" frame.
- A Help button for additional assistance.
- A Temperature Unit selection button and a dropdown menu for choosing between Celsius (°C) and Fahrenheit (°F).

Upper Right Side: Experiment Management
This section features:
- A list box to view saved experiments.
- A text field to name your experiment.
- Buttons for saving, replacing, and deleting experiments.
- Center and Lower Right Side: Information Input
- A large text field is available for displaying information and user input.

Fig. CHEMIX School Psychrometric Calculator (lower left, red frame)
psychrometric calculator


Using the Calculator
In the "Calculate Psychrometric Value" frame, you will find:
Three input text fields, each accompanied by a radio button.
A calculated Dew Point displayed as a label (not an input box).
How to Calculate Values
Select a Parameter: Click the radio button next to the field corresponding to the parameter you wish to calculate. The selected field will turn grey, indicating it is now in output mode (no further input can be entered).
Input Changes: Any modifications made in the other two text fields will automatically update the output value.
Temperature Unit Selection: Choose your preferred temperature unit (Celsius or Fahrenheit) using the dropdown menu labeled "Temperature Unit."

About the Psychrometric Value Calculator  (Magnus-Tetens Approximation)
Relative Humidity Accuracy (1013.25hPa, 1Atm):
          +/- 2C   for temperatures between -10C to 40C
          +/- 1C   for temperatures between   0C to 30C
          +/- 0.5C for temperatures between  10C to 25C
Dew Point Accuracy (1013.25hPa, 1Atm):
          +/- 0.5C for temperatures between   0C to 30C
          +/- 1C   for temperatures between -10C to 40C

                              Example Calculation
The humidity and dew points may vary based on atmospheric pressure:
For example, if you input Dry Bulb Temp. 20.4C & Wet Bulb Temp. 14.2C The
humidity and dew points may vary based on atmospheric pressure:

         Pressure (hPa)              Relative Humidity (%)           Dew Point (C)
         -------------------------------------------------------------------------------------
        980 (Low)                            51.8(1.5% added)                  9.9
       1013 Calculated (Normal)    50.3                                        9.7
       1040 (High)                          48.8(1.5% subtracted)            9.5

                Adjusting for Pressure Effects (+/- 30hPa)
            To enhance accuracy during low or high pressures:
For low pressure (980 hPa), add 1.5% to the calculated relative humidity.
For high pressure (1040 hPa), subtract 1.5% from the calculated relative
humidity.




Related topics:

Hygrometer Calibration

Psychrometric Celsius and Fahrenheit Tables

Dry Bulb Wet Bulb Method

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