Possible accuracy issue when calculating dew point temp from dry bulb temp and RH.

[DanielHTRC]

Describe the bug

While double checking dew point results from psychrolib against other sources I found them to be between 2 and 4 degrees higher than all other sources at lower RH. at 100% RH the values are correctly the given dtemp.

I'm usure is this deviation is due to an older version of ASHREA calculation or if there is an error in the package function itself but wanted to bring this up.

To Reproduce

(R)

library (psychrolib)

SetUnitSystem("IP")
test_psychrolib <- GetTDewPointFromRelHum(0, 0.10)

print(test_psychrolib)
[1] -40.10981

Expected behavior

Result was expected to be between -44.2 and -42.123 based on the range of results from 7 other sources.

Desktop (please complete the following information):

Windows

platform x86_64-w64-mingw32
arch x86_64
os mingw32
crt ucrt
system x86_64, mingw32
status
major 4
minor 4.1
year 2024
month 06
day 14
svn rev 86737
language R
version.string R version 4.4.1 (2024-06-14 ucrt)
nickname Race for Your Life