Abstract Purpose This study aimed to develop software tools for psychrometric education and analyzed the accuracy of used models.Methods Two psychrometric software tools were developed. One tool is based on an ASABE standard and calculates moist air properties and displays state point migration on a psychrometric chart pane according to user input sequences. The other tool is mainly based on ASHRAE equations with a few modifications to improve accuracy. It calculates moist air properties when two property values out of nine are provided in 1 out of 13 parameter combinations. The accuracy of the tools is addressed at 15 selected state points referring to a real gas model for a temperature range of 5–50 °C.Results The first tool showed an accuracy of 99.12. However, at an extremely cool and dry condition (5 °C and 2.02 RH), it failed because of extrapolation beyond the applicable range of saturation line equation. The second tool showed an accuracy of 99.68. Among the situations of input properties, the best performance was obtained with an accuracy of 99.85 wherein dry-bulb and dew-point temperatures are provided. When dry-bulb temperature and specific volume are provided, the lowest accuracy of 99.20 was obtained.Conclusions Both tools can be used in air-conditioning and psychrometric courses for analyzing and visualizing moist air processes with sufficient accuracy.
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