ON ISENTROPIC CHANGES OF ALTERNATIVE REFRIGERANTS (R-123, R-134A, R-500, R-503)

This work deals with the real-gas isentropic exponents k(p,nu),k(nu,T) k(p,T). These have been calculated for the alternative refrigerants R- 123 and R-134a (i.e. the leading proposed replacements for CFC-11 and CFC-12, respectively), as well as for the azeotropic blends R-500 (73. 8 wt% R-12 + 26.2 wt% R-152a) and R-503 (40.1 wt% R-23 + 59.9 wt% R-13 ). Analytical relations, arithmetic values and comparisons are given f or a wide range of state conditions. The results should be useful in r efrigeration applications. Copyright (C) 1996 Elsevier Science Ltd.