Mirror Gas Turbines: A Newly Proposed Method of Exhaust Heat Recovery

Fujii, Shoichi; Kaneko, Ken‐ichi; Otani, Kiyoshi; Tsujikawa, Yoshiharu

doi:10.1115/1.1366324

Cited by 41 publications

(13 citation statements)

References 1 publication

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“…They found that a Brayton cycle with an IBC as a bottoming cycle had a thermal efficiency of over 60% for a turbine inlet temperature of 1500°C. Fuji et al [8] showed that the IBC could either replace a Rankine cycle as a bottoming cycle or could be used as an alternative to recuperation. Agnew et al [9] showed that overall efficiency could be improved with higher inverted cycle inlet pressures when used as a bottoming cycle.…”

Section: Figure 1: Inverted Brayton Cyclementioning

confidence: 99%

Experimental Investigation of an Inverted Brayton Cycle for Exhaust Gas Energy Recovery

Kennedy

Chen

Ceen

et al. 2018

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines

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Exhaust gases from an internal combustion engine (ICE) contain approximately 30% of the total energy released from combustion of the fuel. In order to improve fuel economy and reduce emissions, there are a number of technologies available to recover some of the otherwise wasted energy. The inverted Brayton cycle (IBC) is one such technology. The purpose of the study is to conduct a parametric experimental investigation of the IBC. Hot air from a turbocharger test facility is used. The system is sized to operate using the exhaust gases produced by a 2 litre turbocharged engine at motorway cruise conditions. A number of parameters are investigated that impact the performance of the system such as turbine inlet temperature, system pressure drop and compressor inlet temperature. The results confirm that the output power is strongly affected by the turbine inlet temperature and system pressure drop. The study also highlights the packaging and performance advantages of using a 3D printed heat exchanger to reject the excess heat. Due to rotordynamic issues, the speed of the system was limited to 80,000 rpm rather than the target 120,000 rpm. However, the results show that the system can generate a specific work of up to 17 kJ/kg at 80,000 rpm. At full speed it is estimated that the system can develop approximately 47 kJ/kg, which represents a thermal efficiency of approximately 5%.

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Section: Figure 1: Inverted Brayton Cyclementioning

confidence: 99%

Experimental Investigation of an Inverted Brayton Cycle for Exhaust Gas Energy Recovery

Kennedy

Chen

Ceen

et al. 2018

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines

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“…Así mismo, la búsqueda de alternativas para disminuir el trabajo de compresión conduce a aproximar un proceso de compresión a temperatura constante, utilizando dos o más compresores con enfriadores de tipo mecánico, evaporativo, etc. (Bassily, 2004;Fujii et al, 2001). Chen et al (2004), realizan el estudio de dos compresores con interenfriamiento variando la relación de presiones de compresión y por consiguiente la relación de presiones de enfriamiento, con el objetivo de suministrar el mínimo trabajo de compresión y mejorar la eficiencia térmica.…”

Section: Introductionunclassified

Relaciones de Presiones Óptimas de los Ciclos Complejos de las Turbinas de Gas

et al. 2009

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El objetivo de este trabajo es estudiar el comportamiento termodinámico de turbinas de gas complejas que incluyen varias etapas de compresión y enfriamiento, seguidas de dos o más secciones de combustión-expansión. Se obtienen los modelos matemáticos para determinar el trabajo, la eficiencia térmica y sus respectivas relaciones de presiones óptimas en función de las temperaturas de los gases a la entrada de la turbina y del aire a la entrada del compresor, de las eficiencias isentrópicas de compresión y de expansión y del número de etapas de compresión N C y expansión N T. Se presentan curvas paramétricas donde se muestran las relaciones de presiones óptimas para obtener el trabajo y la eficiencia térmica máxima, para cada uno de los casos analizados. Para las turbinas de gas complejas, las relaciones de presiones óptimas se encuentran en un rango aceptable, entre 8.1 y 23.1 para el trabajo máximo y de 17.4 a 32.2 para la eficiencia térmica máxima.

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“…Furthermore, the performance optimization of an endoreversible closed Braysson cycle with heat resistance losses in the hot-side and cold-side heat exchangers was performed by using finite-time thermodynamics (FTT) [4,5] in 2002. Fujii et al [6] studied a bottom cycle constructed from an expander followed by an intercooled compression processes (mirror arrangement) in 2001. They limited the bottom cycle expansion pressure to 0.25 bar to avoid a rapid increase in gas flow axial velocity.…”

Section: Introductionmentioning

confidence: 99%

Power and efficiency optimization for combined Brayton and two parallel inverse Brayton cycles. Part 1: Description and modelling

Chen

Zhang

Sun

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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A thermodynamic model for open combined Brayton and two parallel inverse Brayton cycles is established using finite-time thermodynamics in part A of the current paper. The flow processes of the working fluid with the pressure drops of the working fluid and the size constraints of the real power plant are modelled. There are 17 flow resistances encountered by the gas stream for the combined Brayton and two parallel inverse Brayton cycles. Six of these, the friction through the blades and vanes of the compressors and the turbines, are related to the isentropic efficiencies. The remaining flow resistances are always present because of the changes in flow cross-section at the compressor inlet of the top cycle, combustion inlet and outlet, turbine outlet of the top cycle, turbine outlets of the bottom cycle, heat exchanger inlets, and compressor inlets of the bottom cycle. These resistances control the air flowrate and the net power output. The relative pressure drops associated with the flow through various cross-sectional areas are derived as functions of the compressor inlet relative pressure drop of the top cycle. The analytical formulae about the relations between power output, thermal conversion efficiency, and the compressor pressure ratio of the top cycle are derived with the 17 pressure drop losses in the intake, compression, combustion, expansion, and flow process in the piping, the heat transfer loss to ambient, the irreversible compression and expansion losses in the compressors and the turbines, and the irreversible combustion loss in the combustion chamber. The performance of the model cycle is optimized by adjusting the compressor inlet pressure of the bottom cycles, the mass flowrate and the distribution of pressure losses along the flow path in part B of the current paper.

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Mirror Gas Turbines: A Newly Proposed Method of Exhaust Heat Recovery

Cited by 41 publications

References 1 publication

Experimental Investigation of an Inverted Brayton Cycle for Exhaust Gas Energy Recovery

Experimental Investigation of an Inverted Brayton Cycle for Exhaust Gas Energy Recovery

Relaciones de Presiones Óptimas de los Ciclos Complejos de las Turbinas de Gas

Power and efficiency optimization for combined Brayton and two parallel inverse Brayton cycles. Part 1: Description and modelling

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