TY - GEN A1 - Berg, Heinz Peter A1 - Himmelberg, Axel A1 - Poojitganont, Thanapol T1 - Hybrid Turbo Compound Fan Engine an Eco-Efficient Propulsion System for Aviation T2 - Materials Science and Engineering : Thai Society of Mechanical Engineering, the 10th International Conference on Mechanical Engineering (TSME-ICOME2019) 10-13 December 2019, Pattaya, Thailand N2 - The path to electric propulsion systems depends on the development of powerful, compact and very light energy storage system with a high storage density. In order to create an environment-friendly intermediate solution in the medium term, especially for aircraft engines of medium power classes, it makes sense to use an innovative, electrically parallel hybrid unit based on rotary engines and electric boosters for start and climb phases as a propulsion system. An aero-engine application, based on the HSD concept (HSD = hybrid super-drive – hybrid Wankel rotary engine) for different hybrid-parallel propulsion systems is presented. In this article, the introduced technology is based on a currently produced family of multi-component Wankel rotary engines. The proposed HSD concept uses a chamber volume of 650ccm per rotor. The projected power range (0.8 to 1.36 MW) is covered by an innovative hybrid electric parallel turbo compound concept together with 2x4 rotary engine units. A novel, airbearing turbo engine with integrated electric drive is used as a turbocharger for charging the rotary engine. For the aero-engine technology, the counter-rotating fan (CRF) concept shown as an example for an aircraft technolo¬gy carrier (light jet) leads to a further increase in the efficiency of a complete system. KW - rotary engine, hybrid combustion engine, aero-engine, air bearing, counter rotating fan, electric flight Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012010 U6 - https://doi.org/10.1088/1757-899X/886/1/012010 SN - 1757-899X VL - 2020 PB - IOP Science CY - Bristol ET - 1. Auflage ER - TY - GEN A1 - Dückershoff, Roland A1 - Berg, Heinz Peter A1 - Himmelberg, Axel A1 - Lehmann, Mario A1 - Kleissl, Marko ED - Ashton, Anete T1 - Influence on the Electrical Efficiency of a Hybrid MGT-SOFC-System by μ-fogging in a-Two-Staged Compressor System T2 - IOP Conference Series: Materials Science and Engineering N2 - Hybrid combinations of solid oxide fuel cell and recuperated micro gas turbines can convert the chemical energy of hydrocarbon-based fuels in electrical energy with high electrical efficiency. With an integrated and improved cycle management, more than 70% of the energy content of the fuel could be converted. Therefore, the systems are highly suitable for the Power-To-Gas conversion. In particular, a pressure charging of the SOFC fuel cell leads to an increase in stack performance. By a downstream turbo set, after residual fuels are intentionally oxidized with an afterburner, additional electrical energy can be gained from the expansion of the hot exhaust gas stream and the overall efficiency can be increased. In order to increase the electrical efficiency of the system, it is proposed, to ensure the required compression of the process air in particular by a-two-staged turbo compressor with an intermediate cooling system. By thus achievable reduction of the dissipation of the compressor and by targeted condensation of finest drops in front of the second compressor stage affected by intermediate cooling, an increase in efficiency of the system is possible. This is achieved by targeted cooling of the process air behind a low pressure compression, so that it is saturated over 100% relative air humidity. As a result, a slightly supersaturated airflow is available for the second compressor stage, which enters the compressor after heat removal via an intermediate cooling having a small number of microdroplets. Therefore, the condensed water evaporates again by the heat of compression in the second stage and the compressed flow ultimately enters the recuperation at a lower temperature than during normal compression. Thus, more heat can be recovered within the recuperation system. Therefore, the electrical energy of the system can be produced having higher efficiency, because the heat dissipation of the overall system decreases. In this article it is presented, how such a process is thermodynamically modelled and how a technical realization can be built after optimization by simulations. Finally, in this study, the process-influencing factors are analyzed to show the highest possible electrical yield of such a system. KW - Micro Gasturbine, Hybrid, SOFC Fuel Cell, Fogging, Efficiency Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012041 U6 - https://doi.org/10.1088/1757-899X/886/1/012041 SN - 1757-899X SP - 1 EP - 8 PB - IOP Science CY - Bristol ET - 1. Auflage ER - TY - GEN A1 - Poojitganont, Thanapol A1 - Antoshkiv, Oleksiy A1 - Watjatrakul, Boonchai A1 - Berg, Heinz Peter ED - Ashton, Anete T1 - Efficiency and Emission Simulations of Hydrogen-Fuel City Buses T2 - IOP Conference Series: Materials Science and Engineering N2 - In this study, the AVL Cruise is implemented to simulate driving parameters including the driving path, the power loss on engine accessories, the gear-shifting scheme and the engine's fuel cut-off strategy influencing the bus fuel efficiency and emission. The Mercedes Conecto LF city bus using a diesel engine with Standardised On-Road Test Cycles was firstly simulated and compared with available literature. The application of hydrogen fuel was then examined and its result was compared with the diesel fuel on the specific fuel consumption. In addition, the driving cycles in Bangkok were simulated. The results show the pattern on both driving cycles with different fuel are similar, however, the fuel consumption of H2 is significantly less than in the case of Diesel. Moreover, it is also evident that the SORT driving cycle cannot represent the heavy traffic of Bangkok. KW - Efficiency, Emission Simulations, Hydrogen-Fuel, Driving Cycles, AVL Cruise Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012025 U6 - https://doi.org/10.1088/1757-899X/886/1/012025 SN - 1757-899X SP - 1 EP - 8 PB - IOP Science CY - Bristol ET - 1. Auflage ER -