@inproceedings{PoojitganontBergKingkoetal., author = {Poojitganont, Thanapol and Berg, Heinz Peter and Kingko, Chirdchai and Bun-Athuek, Natthaphon and Watjatrakul, Boonchai}, title = {One-Dimensional Thermodynamic Cycle Analysis of Micro Gas Turbine (MGT) for Small Power Plant}, series = {The International Conference on Science and Technology, 2015}, booktitle = {The International Conference on Science and Technology, 2015}, publisher = {IEEE}, address = {New York}, doi = {10.1109/TICST.2015.7369342}, pages = {64 -- 69}, abstract = {The energy demands worldwide and especially in developing countries are significantly increased, whereas the numbers of electricity supply are not enlarged at Together with the decentralized ideal of the forthcoming power plants, the 100kW micro gas turbine (MGT) could be one of the solutions for the future. Based on the multi development project for small power plants, the 1D simulation of the overall system with MATLAB has been performed to utilize as an analysis tool for optimizing the thermodynamic cycle of the system. At the beginning the code has been validated with the commercial program for power plant simulation, called EBSILON Professional. The result shows that they are compatible in the same direction. The next part illustrates the comparing result of the efficiency on the whole system, when turbine inlet temperature has changed. The results show that higher turbine inlet temperature provides also higher global efficiency. However, the minimum efficiencies, which are obtained on each specific turbine inlet temperature, are not corresponded at the same pressure ratio. In the latter section, the effect of fuel types is also considered on the output efficiency. The results show that to maintain the output efficiency on each fixed turbine inlet temperature the fuel mass flow rate has to be increased in reciprocal to their lower heating values. However, in the lower range of their mass flow rate the increment of efficiency is not proportional to the addition of fuel.}, language = {en} } @misc{PoojitganontSinchaiWatjatrakuletal., author = {Poojitganont, Thanapol and Sinchai, J. and Watjatrakul, Boonchai and Berg, Heinz Peter}, title = {Numerical Investigation of In-chamber Flow inside a Wankel Rotary Engine}, series = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, journal = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, editor = {Prukvilailert, Monchai}, edition = {1. Auflage}, publisher = {IOP Publishing/IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/501/1/012043}, pages = {326 -- 333}, abstract = {In this paper the in-house technique mesh moving function based on AVL-FIRE has been developed as a simulation tool to investigate the in-chamber flow phenomena of the Wankel rotary engine. The meshes from the starting rotor position at 165° BTDC until the ending rotor position at top dead center (TDC) have been created and connected together. The numerical simulations between an intake stroke and the end of a compression stroke have been successively performed. The results are validated with the selected publication on various engine speeds, at 675 rpm and 1170 rpm. In parallel three refinements of meshes have been carried out, in order to optimize the suitable meshes' elements for the calculation of this engine type. In addition, the turbulence models, which are standard k-ε and Large Eddy Simulations (LES), have been varied for detailed investigation of their predictive capabilities. The simulation results show that the flow phenomena are well corresponding to the experimental data in both engine speeds, especially with the LES. It could be also identified that the LES model performs better on predicting the flow field both in directions and characteristics. Moreover, there is no evidently difference on the results between the medium (c.a. 100,000 elements) and fine (c.a. 1,000,000 elements) meshes comparing to the experimental results.}, language = {en} } @misc{PoojitganontAntoshkivWatjatrakuletal., author = {Poojitganont, Thanapol and Antoshkiv, Oleksiy and Watjatrakul, Boonchai and Berg, Heinz Peter}, title = {Efficiency and Emission Simulations of Hydrogen-Fuel City Buses}, series = {IOP Conference Series: Materials Science and Engineering}, journal = {IOP Conference Series: Materials Science and Engineering}, editor = {Ashton, Anete}, edition = {1. Auflage}, publisher = {IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/886/1/012025}, pages = {1 -- 8}, abstract = {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.}, language = {en} }