APPLICATION OF NONLINEAR-REGRESSION IN THE DEVELOPMENT OF A WIDE-RANGE FORMULATION FOR HCFC-22

An equation of state has been developed for HCFC-22 for temperatures f rom the triple point (115.73 K) to 550 K, at pressures up to 60 MPa. B ased on comparisons between experimental data and calculated propertie s, the accuracy of the wide-range equation of state is +/- 0.1% in den sity, +/- 0.3% in speed of sound, and +/- 1.0% in isobaric heat capaci ty, except in the critical region. Nonlinear fitting techniques were u sed to fit a liquid equation of state based on P-rho-T, speed of sound , and isobaric heat capacity data. Properties calculated from the liqu id equation of state were then used to expand the range of validity of the wide range equation of state for HCFC-22.