A saturated liquid density equation for refrigerants

An accurate, generalized orthobaric density equation is proposed for refrigerants R-11, R-12, R-13, R-14, R-22, R-23, R-32, R-123, R-123a, R-124, R-134a, R-141b, R-142b, R-143, R-143a and R-152a. The fitting parameter for the new equation has been obtained from experimental saturated liquid densities. The triple point density, while observable, is unknown for the substances in this work and also must be obtained from the fit of the data. The density equation is based on a combination of asymptotic behavior in the critical region and the rule of rectilinear diameters. This equation describes the entire saturated liquid density curve within the estimated accuracy of the experimental measurements. Although a saturated vapor equation would also result from the current analysis, we do not address the vapor in this paper. (C) 1997 Elsevier Science B.V.