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P_LIBR
P_LiBr returns the vapor pressure [psia or kPa] over a solution of lithium bromide and water as a function of temperature and mass percent lithium bromide. The function will accept and return values in English Units if the unit specification (first parameter) is 'Eng' and it SI if the unit specification is 'SI'.
The correlation used here is taken from the 1989 ASHRAE Handbook of Fundamentals.
The correlation is applicable for 45<=X<=75 and 40 F<T<350 C.
Example: P=P_LiBr('SI' or 'Eng', T, X)