graph_psychrometric: Create a Psychrometric Chart

In ConSciR: Tools for Conservation Science

Create a Psychrometric Chart

Description

This function generates a psychrometric chart based on input temperature and relative humidity data.

Usage

graph_psychrometric(
  mydata,
  Temp = "Temp",
  RH = "RH",
  data_col = NULL,
  data_alpha = 0.5,
  LowT = 16,
  HighT = 25,
  LowRH = 40,
  HighRH = 60,
  Temp_range = c(0, 40),
  y_func = "calcMR",
  ...
)

Arguments

mydata	A data frame containing temperature and relative humidity data.
Temp	Column name in mydata for temperature values.
RH	Column name in mydata for relative humidity values.
data_col	Name of column to use for colouring points. Default is "Sensor" if present, otherwise "RH".
data_alpha	Value to supply for make points more or less transparent. Default is 0.5.
LowT	Numeric value for lower temperature limit of the target range. Default is 16°C.
HighT	Numeric value for upper temperature limit of the target range. Default is 25°C.
LowRH	Numeric value for lower relative humidity limit of the target range. Default is 40%.
HighRH	Numeric value for upper relative humidity limit of the target range. Default is 60%.
Temp_range	Numeric vector of length 2 specifying the overall temperature range for the chart. Default is c(0, 40).
y_func	Function to calculate y-axis values. See above for options, default is mixing ratio ('calcMR').
...	Additional arguments passed to y_func.

Details

Humidity and conservation functions can be used for the y-axis.

• calcHR: Humidity Ratio (g/kg)

• calcMR: Mixing Ratio (g/kg)

• calcAH: Absolute Humidity (g/m^3)

• calcSH: Specific Humidity (g/kg)

• calcAD: Air Density (kg/m^3)

• calcDP: Dew Point (°C)

• calcFP: Frost Point (°C)

• calcEnthalpy: Enthalpy (kJ/kg)

• calcPws: Saturation vapor pressure (hPa)

• calcPw: Water Vapour Pressure (hPa)

• calcPI: Preservation Index

• calcLM: Lifetime

• calcEMC_wood: Equilibrium Moisture Content (wood)

Value

A ggplot object representing the psychrometric chart.

Examples

# mydata file
filepath <- data_file_path("mydata.xlsx")
mydata <- readxl::read_excel(filepath, sheet = "mydata", n_max = 100)

# Basic usage with default settings
graph_psychrometric(mydata, Temp, RH)

# Custom temperature and humidity ranges
graph_psychrometric(mydata, Temp, RH, LowT = 8, HighT = 28, LowRH = 30, HighRH = 70)

# Using a different psychrometric function (e.g., Absolute Humidity)
graph_psychrometric(mydata, Temp, RH, y_func = calcAH)

# Adjusting the overall temperature range of the chart
graph_psychrometric(mydata, Temp, RH, Temp_range = c(12, 30))

ConSciR documentation built on Nov. 5, 2025, 5:25 p.m.