scholarly journals Utilization of residual heat in Diesel engines, CFD simulation of a thermoelectric generator

2017 ◽  
Vol 1 (15) ◽  
pp. 663-665
Author(s):  
L. Montoro ◽  
A. Massaguer ◽  
E. Massaguer ◽  
M. Comamala ◽  
R. Fernández ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Thermoelectric Generator ◽  
Cfd Simulation ◽  
Residual Heat

scholarly journals Design and Optimization of an Integrated Turbo-Generator and Thermoelectric Generator for Vehicle Exhaust Electrical Energy Recovery

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3134 ◽  
Author(s):  
Prasert Nonthakarn ◽  
Mongkol Ekpanyapong ◽  
Udomkiat Nontakaew ◽  
Erik Bohez
Keyword(s):  
Diesel Engines ◽  
High Performance ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Electrical Energy ◽  
Vehicle Exhaust ◽  
Gasoline Engines ◽  
Design And Optimization ◽  
Charging Station ◽  
Turbo Generator

The performance of turbo-generators significantly depends on the design of the power turbine. In addition, the thermoelectric generator can convert waste heat into another source of energy. This research aims to design and optimize an integrated turbo-generator and thermoelectric generator for diesel engines. The goal is to generate electricity from the vehicle exhaust gas. Electrical energy is derived from generators using the flow, pressure, and temperature of exhaust gases from combustion engines and heat-waste. In the case of turbo-generators and thermoelectric generators, the system automatically adjusts the power provided by an inverter. Typically, vehicle exhausts are discarded to the environment. Hence, the proposed conversion to electrical energy will reduce the alternator charging system. This work focuses on design optimization of a turbo-generator and thermoelectric generator for 2500 cc. diesel engines, due to their widespread usage. The concept, however, can also be applied to gasoline engines. Moreover, this model is designed for a hybrid vehicle. Charging during running will save time at the charging station. The optimization by variable van angles of 40°, 50°, 62°, 70°, and 80° shows that the best output power is 62°, which is identical to that calculated. The maximum power outputted from the designed prototype was 1262 watts when operating with an exhaust mass flow rate of 0.1024 kg/s at 3400 rpm (high performance of the engine). This research aims to reduce fuel consumption and reduce pollution from the exhaust, especially for hybrid vehicles.

Thermal analysis of a thermoelectric generator for light-duty diesel engines

2018 ◽  
Vol 226 ◽  
pp. 690-702 ◽  
Author(s):  
Pablo Fernández-Yañez ◽  
Octavio Armas ◽  
Azael Capetillo ◽  
Simón Martínez-Martínez
Keyword(s):  
Thermal Analysis ◽  
Diesel Engines ◽  
Thermoelectric Generator ◽  
Light Duty

Simulation Based Development of Combustion Concepts for Large Diesel Engines

2011 ◽  
Author(s):  
Michael Engelmayer ◽  
Andreas Wimmer ◽  
Gerhard Pirker ◽  
Bernhard Pemp ◽  
Gernot Hirschl
Keyword(s):  
Boundary Conditions ◽  
Combustion Chamber ◽  
Diesel Engines ◽  
Cfd Simulation ◽  
Simulation Models ◽  
Injection System ◽  
Single Cylinder ◽  
Development Methodology ◽  
Cycle Simulation ◽  
Engine Cycle

The development of low-emission combustion concepts for large Diesel engines requires a specially adapted methodology. In all phases of the development process, it is essential that appropriate tools are used so that an optimized solution can be found within a short time. This paper will describe the methodology used for developing combustion concepts for large Diesel engines. In general, the development of a combustion concept for Diesel engines comprises the definition of the system (e.g. combustion chamber geometry, injection system, EGR system and charging system) and the calibration of engine parameters (e.g. injection parameters, EGR rate, charge pressure, excess air ratio and valve timing) for an application and its emission scenario. In the present case, the main objective was to develop concepts for applications to comply with emissions standards according to EU Stage III B and US EPA Tier 4. To this end, the LEC has developed the LDM method (LEC Development Methodology). This method is based on the intensive interaction of simulation with experimental investigations on single-cylinder research engines. As part of this development methodology, 3D CFD simulation as well as 0D and 1D engine cycle calculation are employed. Another approach used to handle the complexity of the systems is Design of Experiments (DoE) for simulation and experimental work. While 3D CFD simulation is used to optimize the details of the combustion and pollutant formation processes in the combustion chamber, 0D and 1D engine cycle simulation is applied to select the concepts and to pre-optimize important engine parameters. One great advantage of 0D and 1D models is their short calculation time, which allows the investigation of a great amount of variations in parameters. In order to apply the methodology, it must be guaranteed that the results from tests on the single-cylinder engine (SCE) can be transferred to the multi-cylinder engine (MCE). Therefore, it is necessary that the boundary conditions of the SCE are comparable to those of the MCE. Not only the same thermal boundary conditions but also the same conditions at the beginning of the high-pressure cycle (charge composition, pressure and temperature) must be maintained. The SCE measurement results that are generated serve to verify and calibrate the simulation models and deliver the necessary boundary conditions for further simulations. All in all, the paper comprises an evaluation of the different simulation models used and the applied development methodology in order to optimize fuel consumption and to reduce the emissions of large Diesel engines.

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