THERMODYNAMIC PROPERTIES OF DIFFERENT REFRIGERANTS
BY TIM MCDOWELL (1993)


This subroutine calculates the thermodynamic properties of
many different refrigerants.  The refrigerant options are
R11, R12, R13, R14, R22, R114, R134a, R500, R502, and
ammonia (R717).  The units used can be either English or
SI, and the temperatures used are either Fahrenheit or 
Celcius.

Different variabless within the program allows it to calculate
numerous properties.  The newest refrigerant to be included
in this subroutine is ammonia