This function calculates the Equilibrium Moisture Content (EMC) of wood based on relative humidity and temperature.
Equilibrium Moisture Content (EMC) is the moisture content at which a material, such as wood or other hygroscopic substanceshas reached an equilibrium with its environment and is no longer gaining or losing moisture under specific temperature and relative humidity.
References
Simpson, W. T. (1998). Equilibrium moisture content of wood in outdoor locations in the United States and worldwide. Res. Note FPL-RN-0268. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory.
Hailwood, A. J., and Horrobin, S. (1946). Absorption of water by polymers: Analysis in terms of a simple model. Transactions of the Faraday Society 42, B084-B092. DOI:10.1039/TF946420B084
Examples
calcEMC_wood(20, 50)
#> [1] 9.271141
head(mydata) |> dplyr::mutate(EMC = calcEMC_wood(Temp, RH))
#> # A tibble: 6 × 6
#> Site Sensor Date Temp RH EMC
#> <chr> <chr> <dttm> <dbl> <dbl> <dbl>
#> 1 London Room 1 2024-01-01 00:00:00 21.8 36.8 7.20
#> 2 London Room 1 2024-01-01 00:15:00 21.8 36.7 7.19
#> 3 London Room 1 2024-01-01 00:29:59 21.8 36.6 7.17
#> 4 London Room 1 2024-01-01 00:44:59 21.7 36.6 7.17
#> 5 London Room 1 2024-01-01 00:59:59 21.7 36.5 7.16
#> 6 London Room 1 2024-01-01 01:14:59 21.7 36.2 7.11