Design methodology for radial turbo expanders in mobile organic Rankine cycle applications
| Autor: | A. Gonzalez Hernandez, Ricardo Martinez-Botas, Aaron Costall, Peter Newton |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Technology
Engineering Chemical Turbo expander Rankine cycle Engineering Energy & Fuels Combined cycle Radial turbine Mechanical engineering Management Monitoring Policy and Law WASTE HEAT-RECOVERY Turbine 09 Engineering Automotive engineering law.invention Energy(all) law THERMODYNAMIC ANALYSIS Waste heat Bottoming cycles Waste heat recovery 14 Economics Civil and Structural Engineering Mobile organic Rankine cycle Organic Rankine cycle Science & Technology Energy business.industry Mechanical Engineering Turboexpander Building and Construction General Energy WORKING FLUIDS Working fluid business Toluene |
| Zdroj: | Applied Energy. 157:729-743 |
| ISSN: | 0306-2619 |
| DOI: | 10.1016/j.apenergy.2015.02.072 |
| Popis: | Future vehicles for clean transport will require new powertrain technologies to further reduce CO 2 emissions. Mobile organic Rankine cycle systems target the recovery of waste heat in internal combustion engines, with the exhaust system identified as a prime source. This article presents a design methodology and working fluid selection for radial turbo expanders in a heavy-duty off-road diesel engine application. Siloxanes and Toluene are explored as the candidate working fluids, with the latter identified as the preferred option, before describing three radial turbine designs in detail. A small 15.5 kW turbine design leads to impractical blade geometry, but a medium 34.1 kW turbine, designed for minimum power, is predicted to achieve an isentropic efficiency of 51.5% at a rotational speed of 91.7 k min - 1 . A similar 45.6 kW turbine designed for maximum efficiency yields 56.1% at 71.5 k min - 1 . This emphasizes the main design trade-off – efficiency decreases and rotational speed increases as the power requirement falls – but shows reasonable radial turbine efficiencies and thus practical turbo expanders for mobile organic Rankine cycle applications are realizable, even considering the compromised flow geometry and high speeds imposed at such small scales. |
| Databáze: | OpenAIRE |
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