A ggplot2 Extension for Making Psychrometric Charts • ggpsychro

‘ggplot2’ extension for making psychrometric charts.

Installation

You can install the development version from GitHub with:

# install.packages("remotes")
remotes::install_github("hongyuanjia/ggpsychro")

Example

The creation of a psychrometric chart starts with ggpsychro(). The result is a ggplot object, so grids, stats, geoms, scales, and themes can be added with the same + workflow used by ggplot2.

ggpsychro(tdb_lim = c(0, 50), hum_lim = c(0, 30)) +
    psychro_preset("minimal")

Minimal psychrometric chart with dry-bulb temperature, humidity ratio, and reference grids.

State points and process lines can be supplied with dry-bulb temperature plus one psychrometric property, such as relative humidity.

process <- data.frame(
    dry_bulb_temperature = c(18, 23, 28, 31),
    relative_humidity = c(70, 55, 45, 55)
)

ggpsychro(tdb_lim = c(0, 40), hum_lim = c(0, 25)) +
    psychro_preset("minimal") +
    geom_psychro_process(
        aes(tdb = dry_bulb_temperature, relhum = relative_humidity),
        data = process,
        colour = "#0f766e", linewidth = 1,
        arrow = grid::arrow(length = grid::unit(0.08, "inches"))
    ) +
    stat_psychro_state(
        aes(tdb = dry_bulb_temperature, relhum = relative_humidity),
        data = process,
        colour = "#0f766e", size = 2
    )

Psychrometric process line with four state points on a minimal chart.

Learn more

The longer examples live on the pkgdown site:

Author

Hongyuan Jia

License

The project is released under the terms of MIT License.

Contribute

Please note that the ‘ggpsychro’ project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.