Analysis Of Homogeneous Charge Compression Ignition Hcci Engines For Cogeneration Applications
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Analysis Of Homogeneous Charge Compression Ignition Hcci Engines For Cogeneration Applications
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Author : G. Reistad
language : en
Publisher:
Release Date : 2004
Analysis Of Homogeneous Charge Compression Ignition Hcci Engines For Cogeneration Applications written by G. Reistad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
This paper presents an evaluation of the applicability of Homogeneous Charge Compression Ignition Engines (HCCI) for small-scale cogeneration (less than 1 MWe) in comparison to five previously analyzed prime movers. The five comparator prime movers include stoichiometric spark-ignited (SI) engines, lean burn SI engines, diesel engines, microturbines and fuel cells. The investigated option, HCCI engines, is a relatively new type of engine that has some fundamental differences with respect to other prime movers. Here, the prime movers are compared by calculating electric and heating efficiency, fuel consumption, nitrogen oxide (NOx) emissions and capital and fuel cost. Two cases are analyzed. In Case 1, the cogeneration facility requires combined power and heating. In Case 2, the requirement is for power and chilling. The results show that the HCCI engines closely approach the very high fuel utilization efficiency of diesel engines without the high emissions of NOx and the expensive diesel fuel. HCCI engines offer a new alternative for cogeneration that provides a unique combination of low cost, high efficiency, low emissions and flexibility in operating temperatures that can be optimally tuned for cogeneration systems. HCCI engines are the most efficient technology that meets the oncoming 2007 CARB NOx standards for cogeneration engines. The HCCI engine appears to be a good option for cogeneration systems and merits more detailed analysis and experimental demonstration.
Proceedings Of The Fall Technical Conference Of The Asme Internal Combustion Engine Division
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Author : American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference
language : en
Publisher:
Release Date : 2005
Proceedings Of The Fall Technical Conference Of The Asme Internal Combustion Engine Division written by American Society of Mechanical Engineers. Internal Combustion Engine Division. Technical Conference and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Internal combustion engines categories.
Proceedings Of The Asme Advanced Energy Systems Division
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Author : American Society of Mechanical Engineers. Advanced Energy Systems Division
language : en
Publisher:
Release Date : 2005
Proceedings Of The Asme Advanced Energy Systems Division written by American Society of Mechanical Engineers. Advanced Energy Systems Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Heat pumps categories.
Teri Information Digest On Energy And Environment
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Author :
language : en
Publisher:
Release Date : 2006
Teri Information Digest On Energy And Environment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Power resources categories.
Low Cost High Efficiency Ultra Low Nox Arice Solution Using Hcci Combustion
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Author :
language : en
Publisher:
Release Date : 2010
Low Cost High Efficiency Ultra Low Nox Arice Solution Using Hcci Combustion written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Internal combustion engines categories.
Biomass In Small Scale Energy Applications
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Author : Mateusz Szubel
language : en
Publisher: CRC Press
Release Date : 2019-10-08
Biomass In Small Scale Energy Applications written by Mateusz Szubel and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-08 with Science categories.
Biomass in Small-Scale Energy Applications: Theory and Practice presents the current trends in the development of selected biomass-based technologies for distributed energy generation. It describes the methodology, experimental results, and computer simulations with a focus on pilot systems and devices crucial in multiple applications with related environmental/economic issues. It describes which stages of design, development, and application of advanced biomass-based energy devices are critical in order for a given technology to be successful. It includes both technical/practical information and theoretical background related to combustion kinetics, thermodynamics in energy systems, and properties of selected types of biomass, as well as case studies.
Smart Technologies For Energy Environment And Sustainable Development Vol 2
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Author : Mohan Lal Kolhe
language : en
Publisher: Springer Nature
Release Date : 2022-02-17
Smart Technologies For Energy Environment And Sustainable Development Vol 2 written by Mohan Lal Kolhe and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-17 with Technology & Engineering categories.
This book contains select proceedings of the International Conference on Smart Technologies for Energy, Environment, and Sustainable Development (ICSTEESD 2020). The book is broadly divided into the themes of energy, environment, and sustainable development; and discusses the significance and solicitations of intelligent technologies in the domain of energy and environmental systems engineering. Topics covered in this book include sustainable energy systems including renewable technologies, energy efficiency, techno-economics of energy system and policies, integrated energy system planning, environmental management, energy efficient buildings and communities, sustainable transportation, smart manufacturing processes, etc. The book will be a valuable reference for young researchers, professionals, and policy makers working in the areas of energy, environment and sustainable development.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Chemistry categories.
Control And Robustness Analysis Of Homogeneous Charge Compression Ignition Using Exhaust Recompression
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Author : Hsien-Hsin Liao
language : en
Publisher: Stanford University
Release Date : 2011
Control And Robustness Analysis Of Homogeneous Charge Compression Ignition Using Exhaust Recompression written by Hsien-Hsin Liao and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
There has been an enormous global research effort to alleviate the current and projected environmental consequences incurred by internal combustion (IC) engines, the dominant propulsion systems in ground vehicles. Two technologies have the potential to improve the efficiency and emissions of IC engines in the near future: variable valve actuation (VVA) and homogeneous charge compression ignition (HCCI). IC engines equipped with VVA systems are proven to show better performance by adjusting the valve lift and timing appropriately. An electro-hydraulic valve system (EHVS) is a type of VVA system that possesses full flexibility, i.e., the ability to change the valve lift and timing independently and continuously, making it an ideal rapid prototyping tool in a research environment. Unfortunately, an EHVS typically shows a significant response time delay that limits the achievable closed-loop bandwidth and, as a result, shows poor tracking performance. In this thesis, a control framework that includes system identification, feedback control design, and repetitive control design is presented. The combined control law shows excellent performance with a root-mean-square tracking error below 40 [Mu]m over a maximum valve lift of 4 mm. A stability analysis is also provided to show that the mean tracking error converges to zero asymptotically with the combined control law. HCCI, the other technology presented in this thesis, is a combustion strategy initiated by compressing a homogeneous air-fuel mixture to auto-ignition, therefore, ignition occurs at multiple points inside the cylinder without noticeable flame propagation. The result is rapid combustion with low peak in-cylinder temperature, which gives HCCI improved efficiency and reduces NOx formation. To initiate HCCI with a typical compression ratio, the sensible energy of the mixture needs to be high compared to a spark ignited (SI) strategy. One approach to achieve this, called recompression HCCI, is by closing the exhaust valve early to trap a portion of the exhaust gas in the cylinder. Unlike a SI or Diesel strategy, HCCI lacks an explicit combustion trigger, as autoignition is governed by chemical kinetics. Therefore, the thermo-chemical conditions of the air-fuel mixture need to be carefully controlled for HCCI to occur at the desired timing. Compounding this challenge in recompression HCCI is the re-utilization of the exhaust gas which creates cycle-to-cycle coupling. Furthermore, the coupling characteristics can change drastically around different operating points, making combustion timing control difficult across a wide range of conditions. In this thesis, a graphical analysis examines the in-cylinder temperature dynamics of recompression HCCI and reveals three qualitative types of temperature dynamics. With this insight, a switching linear model is formulated by combining three linear models: one for each of the three types of temperature dynamics. A switching controller that is composed of three local linear feedback controllers can then be designed based on the switching model. This switching model/control formulation is tested on an experimental HCCI testbed and shows good performance in controlling the combustion timing across a wide range. A semi-definite program is formulated to find a Lyapunov function for the switching model/control framework and shows that it is stable. As HCCI is dictated by the in-cylinder thermo-chemical conditions, there are further concerns about the robustness of HCCI, i.e., the boundedness of the thermo-chemical conditions with uncertainty existing in the ambient conditions and in the engine's own characteristics due to aging. To assess HCCI's robustness, this thesis presents a linear parameter varying (LPV) model that captures the dynamics of recompression HCCI and possesses an elegant model structure that is more amenable to analysis. Based on this model, a recursive algorithm using convex optimization is formulated to generate analytical statements about the boundedness of the in-cylinder thermo-chemical conditions. The bounds generated by the algorithm are also shown to relate well to the data from the experimental testbed.
Evaluation Of Technical Feasibility Of Homogeneous Charge Compression Ignition Hcci Engine Fueled With Hydrogen Natural Gas And Dme
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Author :
language : en
Publisher:
Release Date : 2013
Evaluation Of Technical Feasibility Of Homogeneous Charge Compression Ignition Hcci Engine Fueled With Hydrogen Natural Gas And Dme written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.