Possibilities, Limits, and Tradeoffs for Refrigerants in the Vapor Compression Cycle
Mark O. McLinden, Andrei F. Kazakov, J S. Brown, Piotr A. Domanski, Jae H. Heo
We explore the possibilities for refrigerants having low global warming potential (GWP) using two distinct, but complimentary, approaches. In the first approach, we evaluate the effect of a refrigerants fundamental thermodynamic parameters on its performance in the simple vapor compression cycle and several variations on the basic cycle; this defines the limits of what is thermodynamically possible for a refrigerant. The analysis employs evolutionary algorithms, and it identifies the critical temperature and ideal-gas heat capacity as the most significant fluid parameters. There is a fundamental tradeoff between high efficiency and high volumetric capacity for the vapor compression cycle. Performance differences between refrigerants in the simple cycle can be reduced by proper cycle modifications. In the second approach, we examine more than 56 000 chemical compounds from a public domain database of chemical structures. A subset of about 1200 candidate fluids is identified by applying screening criteria to estimates for GWP, flammability, stability, toxicity, and critical temperature. The fluids with critical temperatures below 400 K (i.e., those which could be used in current equipment with minor modifications), are dominated by halogenated olefins. Additional chemical families, including ethers and cyclic compounds, are represented among the fluids having critical temperatures above 400 K.
October 29-30, 2012
2012 ASHRAE/NIST Refrigerants Conference
Gaithersburg, MD October 29-30, 2012
, Kazakov, A.
, Brown, J.
, Domanski, P.
and Heo, J.
Possibilities, Limits, and Tradeoffs for Refrigerants in the Vapor Compression Cycle, ASHRAE Transactions, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=912227
(Accessed December 2, 2023)