Low-GWP Refrigerants; Options and Issues

Published

April 11, 2018

Author(s)

Piotr A. Domanski, Riccardo Brignoli, J S. Brown, Andrei F. Kazakov, Mark O. McLinden

Abstract

This research explored the possibilities for refrigerants having low global warming potential (GWP) with a particular focus on high-pressure applications. The search for suitable refrigerants relied on screening of a comprehensive database using filters of environmental acceptance, chemical stability in the system, low toxicity, coefficient of performance (COP), volumetric capacity (Qvol), and flammability. Among different screening steps, the performance potential (COP and Qvol) of the candidate fluids was assessed using a simulation model that included both thermodynamic and transport properties, and heat exchangers with optimized refrigerant circuitry. The study showed that the low-GWP refrigerant options are very limited, particularly for fluids with volumetric capacities similar to those of R-410A and R-404A. The identified fluids with good COP and low toxicity are at least mildly flammable. Accepting the thermodynamic argument that viable refrigerants are restricted to small molecules, it is out contention that the screened database contained all suitable candidates and our screening process yielded a list of the 'best' low-GWP fluids. Refrigerant blends allow for tradeoffs between COP, volumetric capacity, flammability, and GWP. The probability of finding "ideal", better-performing low-GWP fluids is minimal.

Proceedings Title

Int. Conference on Cryogenics and Refrigeration 2018, April. 12-14, 2018, Shanghai.

Conference Dates

April 12-14, 2018

Conference Location

Shanghai, CN

Pub Type

Conferences

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Keywords

Air conditioning, coefficient of performance, refrigeration, thermophysical properties, working fluids

Citation

Domanski, P. , Brignoli, R. , Brown, J. , Kazakov, A. and McLinden, M. (2018), Low-GWP Refrigerants; Options and Issues, Int. Conference on Cryogenics and Refrigeration 2018, April. 12-14, 2018, Shanghai., Shanghai, CN, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925044 (Accessed September 8, 2024)