The hunt for nonflammable refrigerant blends to replace R-134a
| Autor: | Gregory T. Linteris, Ian H. Bell, Mark O. McLinden, Piotr A. Domanski |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Flammable liquid
Mechanical Engineering 0211 other engineering and technologies Thermodynamics 02 engineering and technology Building and Construction Coefficient of performance Article Refrigerant chemistry.chemical_compound 020401 chemical engineering chemistry ASHRAE 90.1 Environmental science 021108 energy 0204 chemical engineering Ternary operation Condenser (heat transfer) Evaporator Flammability |
| Zdroj: | Int J Refrig |
| ISSN: | 0140-7007 |
| DOI: | 10.1016/j.ijrefrig.2019.05.035 |
| Popis: | We investigated refrigerant blends as possible low GWP (global warming potential) alternatives for R-134a in an air-conditioning application. We carried out an extensive screening of the binary, ternary, and four-component blends possible among a list of 13 pure refrigerants comprising four hydrofluoroolefins (HFOs), eight hydrofluorocarbons (HFCs), and carbon dioxide. The screening was based on a simplified cycle model, but with the inclusion of pressure drops in the evaporator and condenser. The metrics for the evaluation were nonflammability, low GWP, high COP (coefficient of performance), and a volumetric capacity similar to the R-134a baseline system. While no mixture was ideal in all regards, we identified 16 binary and ternary blends that were nonflammable (based on a new estimation method) and with COP and capacity similar to the R-134a baseline; the tradeoff, however, was a reduction in GWP of, at most, 54% compared to R-134a. An additional seven blends that were estimated to be “marginally flammable” (ASHRAE Standard 34 classification of A2L) were identified with GWP reductions of as much as 99%. These 23 “best” blends were then simulated in a more detailed cycle model. |
| Databáze: | OpenAIRE |
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