Hitting the bounds of chemistry: Limits and tradeoffs for low-GWP refrigerants.

Published: August 19, 2015

Author(s)

Mark O. McLinden, J. Steven Brown, Andrei F. Kazakov, Piotr A. Domanski

Abstract

We explore the possibilities for low-GWP refrigerants through two approaches. First, we explore the performance of hypothetical refrigerants to define the limits of what is allowed by thermodynamics. In the second approach, we apply property estimation methods and screening parameters to identify best candidates from a database of 100 million chemicals. We find that the optimal thermodynamic characteristics are quite rare; additional fluids are eliminated because they are unstable or highly toxic. We then estimate the cycle performance (considering the basic cycle, economizer cycle, and a cycle with a liquid-line/suction-line heat exchanger) of the remaining candidates and apply efficiency as an additional screening criterion. The end result is not thousands of low-GWP candidates, but a handful, and even these present tradeoffs. We argue that these represent all the viable candidates for single-component, medium- and high-pressure refrigerants—in other words, we have hit the limits of what chemistry allows.
Conference Dates: August 17-22, 2015
Conference Location: Yokohama, -1
Conference Title: 24th International Congress of Refrigeration
Pub Type: Conferences

Keywords

refrigerants, global warming potential, vapor compression cycle, thermodynamics
Created August 19, 2015, Updated February 19, 2017