Thermodynamic Study on Blends of Hydrocarbons and Carbon Dioxide as Zeotropic Refrigerants
| Autor: | Yiannis A. Levendis, Hameed Metghalchi, Sai C. Yelishala, Reza Sadr, Ziyu Wang, Kumaran Kannaiyan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Materials science Renewable Energy Sustainability and the Environment 020209 energy Mechanical Engineering Zeotropic mixture Energy Engineering and Power Technology 02 engineering and technology Refrigerant 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Fuel Technology chemistry Chemical engineering Geochemistry and Petrology Carbon dioxide 0202 electrical engineering electronic engineering information engineering |
| Zdroj: | Journal of Energy Resources Technology. 142 |
| ISSN: | 1528-8994 0195-0738 |
| DOI: | 10.1115/1.4045930 |
| Popis: | Finding alternative refrigerants is of extreme importance to mitigate anthropogenic climate change. Among the next-generation refrigerants, hydrocarbons (HCs) are of technical interest because they are natural, efficient, have low global warming potential (GWP), and zero ozone depletion potential (ODP). However, their flammability impedes their widespread usage for fire-safety reasons. The present work investigated zeotropic mixtures of hydrocarbons with carbon dioxide (CO2) as refrigerants for a simple vapor-compression refrigeration cycle, since their flammability risks are lower than those of pure hydrocarbons. Refrigerants were selected utilizing various screening steps based on environmental effects (such as GWP, ODP, and toxicity), thermophysical properties (such as critical temperature, and boiling point), and mixture data availability. The thermodynamic analysis for these selected zeotropic mixtures was performed for a cycle with a constant temperature of energy (heat) transfer fluid in both the evaporator and the condenser/gas cooler. Subsequently, performance parameters like the coefficient of performance and volumetric refrigeration capacity were compared for each of these blends at different operating conditions, and thus, the most promising hydrocarbon mixtures with CO2 were identified. As a result, the following four hydrocarbons, individually blended with CO2, were favorable in performance: propylene, dimethyl ether, propane, and isobutane. Further analysis was performed to determine the non-dimensional exergy destruction by the various components of the cycle. |
| Databáze: | OpenAIRE |
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