The thermodynamic limit of extractable kinetic energy buoyancy engine
In this work, consideration is given to the thermodynamic limit of the kinetic energy extractable from the ascending or descending motion of a buoyancy engine for use in the contraction or expansion of its own chamber. From the laws of thermodynamics, a simple expression for thermodynamic efficiency...
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| Format: | article |
| Publication Date: | 2023 |
| Country: | España |
| Institution: | Universitat Politècnica de Catalunya (UPC) |
| Repository: | UPCommons. Portal del coneixement obert de la UPC |
| Language: | English |
| OAI Identifier: | oai:upcommons.upc.edu:2117/393156 |
| Online Access: | https://hdl.handle.net/2117/393156 https://dx.doi.org/10.1016/j.apenergy.2023.121741 |
| Access Level: | Open access |
| Keyword: | Energy conversion Autonomous underwater vehicles Thermodynamics Buoyancy engine Autonomous Underwater Vehicle Thermodynamic laws Conversió d'energia Vehicles submergibles autònoms Termodinàmica Àrees temàtiques de la UPC::Física::Termodinàmica |
| Summary: | In this work, consideration is given to the thermodynamic limit of the kinetic energy extractable from the ascending or descending motion of a buoyancy engine for use in the contraction or expansion of its own chamber. From the laws of thermodynamics, a simple expression for thermodynamic efficiency was derived. It is shown that contrary to what might be expected, the efficiency is not dependent on the drag coefficient and then on the specific shape of the body but rather only on the normalized Reynolds number Re/Ret, where Ret is the terminal Reynolds number. The maximum efficiency was found to be ˜40%when the contraction or expansion takes placeat ˜85% of the terminal velocity |
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