The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Jurgen Ringler - One of the best experts on this subject based on the ideXlab platform.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Abstract Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine. Knowledge of the dynamic response of the employed heat exchangers plays an important role in performance prediction and control system design of the steam cycle. Hence, a dynamic model of the exhaust gas heat exchanger employing the moving-boundary principle was developed and is presented in this paper. The model describes both design operation and the heat-up procedure of the component. For achieving high model accuracy in the resulting broad range of operating conditions, new approaches for modelling wall temperature distribution and zone switching were developed. Simulations of stationary operating points as well as the response to typical disturbances of the system’s input variables are in good agreement with test bench measurements. The model is used to develop a control system for dynamic operation on the test bench. Further studies of the operating characteristics reveal varying dynamic behaviour depending on the heat flow rate from exhaust gas to working fluid as well as coupling of evaporation pressure and outlet steam temperature.
Tilmann Abbe Horst - One of the best experts on this subject based on the ideXlab platform.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Abstract Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine. Knowledge of the dynamic response of the employed heat exchangers plays an important role in performance prediction and control system design of the steam cycle. Hence, a dynamic model of the exhaust gas heat exchanger employing the moving-boundary principle was developed and is presented in this paper. The model describes both design operation and the heat-up procedure of the component. For achieving high model accuracy in the resulting broad range of operating conditions, new approaches for modelling wall temperature distribution and zone switching were developed. Simulations of stationary operating points as well as the response to typical disturbances of the system’s input variables are in good agreement with test bench measurements. The model is used to develop a control system for dynamic operation on the test bench. Further studies of the operating characteristics reveal varying dynamic behaviour depending on the heat flow rate from exhaust gas to working fluid as well as coupling of evaporation pressure and outlet steam temperature.
Marco Seifert - One of the best experts on this subject based on the ideXlab platform.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Abstract Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine. Knowledge of the dynamic response of the employed heat exchangers plays an important role in performance prediction and control system design of the steam cycle. Hence, a dynamic model of the exhaust gas heat exchanger employing the moving-boundary principle was developed and is presented in this paper. The model describes both design operation and the heat-up procedure of the component. For achieving high model accuracy in the resulting broad range of operating conditions, new approaches for modelling wall temperature distribution and zone switching were developed. Simulations of stationary operating points as well as the response to typical disturbances of the system’s input variables are in good agreement with test bench measurements. The model is used to develop a control system for dynamic operation on the test bench. Further studies of the operating characteristics reveal varying dynamic behaviour depending on the heat flow rate from exhaust gas to working fluid as well as coupling of evaporation pressure and outlet steam temperature.
Hermannsebastian Rottengruber - One of the best experts on this subject based on the ideXlab platform.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine.
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dynamic heat exchanger model for performance prediction and control system design of automotive waste heat recovery systems
Applied Energy, 2013Co-Authors: Tilmann Abbe Horst, Hermannsebastian Rottengruber, Marco Seifert, Jurgen RinglerAbstract:Abstract Waste heat recovery by means of a Rankine Cycle is a promising approach for achieving significant reductions in fuel consumption and, as a result, exhaust emissions of Passenger Car Engines. This approach is already well established in industrial applications such as gas and steam power plants or ship propulsion systems. While these systems are mainly designed for stationary operation, the behaviour in highly dynamic operating conditions becomes more important when the principle is transferred to a Passenger Car Engine. Knowledge of the dynamic response of the employed heat exchangers plays an important role in performance prediction and control system design of the steam cycle. Hence, a dynamic model of the exhaust gas heat exchanger employing the moving-boundary principle was developed and is presented in this paper. The model describes both design operation and the heat-up procedure of the component. For achieving high model accuracy in the resulting broad range of operating conditions, new approaches for modelling wall temperature distribution and zone switching were developed. Simulations of stationary operating points as well as the response to typical disturbances of the system’s input variables are in good agreement with test bench measurements. The model is used to develop a control system for dynamic operation on the test bench. Further studies of the operating characteristics reveal varying dynamic behaviour depending on the heat flow rate from exhaust gas to working fluid as well as coupling of evaporation pressure and outlet steam temperature.
Mihai P Dinca - One of the best experts on this subject based on the ideXlab platform.
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lean mixture operation of a Passenger Car gasoline Engine ignited by passively q switched nd yag cr 4 yag laser spark plugs
European Quantum Electronics Conference, 2019Co-Authors: N Pavel, Niculae Boicea, Adrian Birtas, Radu Chiriac, Florin Draghici, Gabriela Croitoru, Mihai P DincaAbstract:Increasing human concern on the environment impact of the present internal combustion Engines motivates the research for methods, techniques or even new concepts and technical solutions that could improve the Engines performances. A promising technique for reduction of both fuel consumption and exhaust gas emissions in automotive Engines is the operation by laser ignition (LI) [1]. For the first time, LI was used by Dale et al. in 1978 to run a one-cylinder ASTM-CFR Engine [2] whereas LI of a four-cylinder Ford Mondeo Engine was first achieved by Mullet et al. in 2008 [3]. More recently, based on development of compact laser spark plugs (LSP), similar to classical spark plugs (CSP), LI was successfully applied to operate real vehicles, by T. Taira et al. in 2013 [4] and by our research teams in 2015–2017 [5,6]. The results proved increased Engine combustion stability [4,5] under LI in comparison with CSP ignition. However, there are still few experimental data, while investigations were done mainly at stoichiometric λ∼1 air-fuel mixture; furthermore, even fewer results are available regarding the exhaust emissions. In this work we report on LI of a four-stroke, four-cylinder, multipoint fuel injection gasoline Passenger Car Engine that was operated at lean air-fuel mixtures using LI with high-peak power, passively Q-switched Nd:YAG/Cr4+:YAG LSP compact devices.
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on the improvement by laser ignition of the performances of a Passenger Car gasoline Engine
Optics Express, 2019Co-Authors: N Pavel, Adrian Birtas, Radu Chiriac, F Draghici, Mihai P DincaAbstract:Laser ignition was used to operate a four-stroke, four-cylinder, multipoint fuel injection gasoline Passenger Car Engine, replacing the Engine classical ignition device. The laser ignition system was compactly built with diode end-pumped Nd:YAG/Cr4+:YAG composite ceramics, each laser spark plug delivering pulses at 1.06 μm with 4 mJ energy and 0.8 ns duration at variable repetition rate, in accordance with the Engine speed. The Engine was operated at constant speed–constant load condition of 2000 rpm–2 bar equivalent brake mean effective pressure, and different ignition timings, thus simulating city traffic situations. Two relative air-fuel ratios have been considered: λ~1 for the stoichiometric mixture operation and λ~1.25 for the lean mixture condition. Parameters indicating Engine performance, efficiency, combustion stability, and emissions have been measured and registered when groups of 500 consecutive cycles were acquired. The Engine brake power, brake specific fuel consumption, coefficient of variability for indicated mean effective pressure, initial and main combustion stage durations, as well as exhaust emissions like Carbon monoxide (CO) and total unburned hydroCarbons (THC) emphasized that significant improvements can be obtained for lean air-fuel mixture operation. Increases of the nitrogen oxides emission (NOx) were measured when laser ignition was used.