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Title Design of bottoming cycles : Using carbon dioxide as working fluid
Author Dahl, Johannes Skorpen
Supervisor Haglind, Fredrik (Thermal Energy Systems, Department of Mechanical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Tveitaskog, Kari Anne (Thermal Energy Systems, Department of Mechanical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2011
Abstract In an effort to find more environmental solutions for ship propulsion an old prime mover, the gas turbine, has been coming into focus once more. While not a study into the prime movers, this thesis is aimed at investigating several types of simple, closed carbon dioxide Rankine cycles for a secondary bottoming cycle in a combined gas and gas cycle arrangement. Through waste heat recovery from the gas turbine exhaust gas it’s possible to produce power from a heat source which would otherwise be spilled. As carbon dioxide has a very low critical temperature the investigated cycles are either transcritical or fully supercritical. These auxiliary cycles were optimized and compared with the more common steam cycles. The simulation tool Dynamic Network Analysis developed at DTU was used to obtain results. While results suggests that there are certain benefits to using carbon dioxide there are several conditions which first must be fulfilled. As technology is today the use of these cycles are limited. The traditional choice of steam cycle gives a better thermal efficiency while being a more well tried solution.
Imprint DTU Mechanical Engineering
Pages 51
Fulltext
Original PDF Master_thesis_Johannes_Dahl.pdf (1.02 MB)
Admin Creation date: 2011-10-06    Update date: 2011-10-06    Source: dtu    ID: 284870    Original MXD