Calculate wet-bulb temperature

Calculate wet-bulb temperature \(T_w\) (°C) from air temperature \(T\) (°C) and dewpoint temperature \(T_d\) (°C).

Usage

cal_wet_bulb_temperature(t, td, t_unit)

Arguments

t, td

Numeric. Air temperature and dewpoint temperature in degree Celsius (°C), degree Fahrenheit (°F), or Kelvin (K).

t_unit

Character string. Unit of the temperature values. Must be one of "celsius", "fahrenheit", or "kelvin".

Value

Numeric value of wet-bulb temperature in degree Celsius (°C).

Details

Wet-bulb temperature \(T_w\) (°C) is the temperature at which air becomes saturated by evaporation at constant pressure. It is calculated using the formula:

$$T_w = T_d + 1/3 * (T - T_d)$$

where \(T\) is the air temperature and \(T_d\) is the dewpoint temperature, in degrees Celsius (°C).

The temperature input is converted to degree Celsius (°C) based on the provided t_unit before calculation.

References

Davis, Robert E., Glenn R. McGregor, and Kyle B. Enfield. “Humidity: A Review and Primer on Atmospheric Moisture and Human Health.” Environmental Research 144 (January 2016): 106–16. https://doi.org/10.1016/j.envres.2015.10.014.

Normand, Charles. “Energy in the Atmosphere.” Quarterly Journal of the Royal Meteorological Society 72, no. 312–313 (April 1946): 145–67. https://doi.org/10.1002/qj.49707231202.

Examples

cal_wet_bulb_temperature(t = 28, td = 12, t_unit = "celsius")
#> [1] 17.33333
cal_wet_bulb_temperature(t = 82.4, td = 53.6, t_unit = "fahrenheit")
#> [1] 17.33333