Equation-of-State-Based Thermodynamic Charges for Nonazeotropic Refrigerant Mixtures

Published

January 1, 1985

Author(s)

Piotr A. Domanski, David Didion

Abstract

Application of a nonazeotropic mixture to a refrigeration machine offers a new degree of freedom in controlling machine performance by control of circulating mixture composition. Presenting possible thermodynamic cycles of such a machine operating with different mixture compositions requires developing appropriate thermodynamic charts with refrigerant mixture composition as a variable. This paper presents thermodynamic charts developed for a nonazeotropic mixture, R13B 1/R152a. The developed charts (pressure-enthalpy, temperature-entropy, and enthalpy composition), though for sake of clarity showing limited data, offer important insight for understanding vapor compression cycles for different compositions. An equation of state capable of describing both the liquid and vapor phases, property algorithms and iteration schemes used in determination ofthe nonazeotropic mixture thermodynamic properties have been explained.

Citation

ASHRAE Transactions

Volume

91

Issue

No. 1

Pub Type

Journals

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Keywords

refrigerants, mixtures, equations, themodynamics, enthalpy, entropy, machinery, algorithms, thermodynamic properies

Citation

Domanski, P. and Didion, D. (1985), Equation-of-State-Based Thermodynamic Charges for Nonazeotropic Refrigerant Mixtures, ASHRAE Transactions, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910741 (Accessed October 11, 2025)