Energy Recovery Systems for Engines

Hounsham, Sandra; Stobart, Richard; Cooke, Adam; Childs, Peter

doi:10.4271/2008-01-0309

Cited by 24 publications

(9 citation statements)

References 5 publications

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“…During the following years similar research programs were performed by other research institutes and vehicle manufacturers. Recently, the solution of Rankine Cycle systems has increased its potential competitiveness in the market even more [4], [5]. This is a result of technical advancements in a series of critical components for the operation of such an installation (heat exchanger, condenser, expander) but also stems from the highly increased fuel prices.…”

Section: Us Department Of Energy (Doe) Was Conducted By Mack Trucks Amentioning

confidence: 99%

Comparative design study of a diesel exhaust gas heat exchanger for truck applications with conventional and state of the art heat transfer enhancements

Mavridou

Mavropoulos

Bouris

et al. 2010

Applied Thermal Engineering

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The exhaust gas of heavy duty diesel engines can provide an important heat source that may be used in a number of ways to provide additional power and improve overall engine efficiency. The sizing of a heat exchanger that can manage the heat load and still be of reasonable size and weight without excessive pressure drop is of significant importance especially for truck applications. This is the subject of the present work. To approach the problem, a total of five different configurations are investigated and a comparison of conventional and state of the art heat transfer enhancement technologies is included. Two groups of configurations are examined: a) a classical shell and tube heat exchanger using staggered cross flow tube bundles with smooth circular tubes, finned tubes and tubes with dimpled surfaces, and b) a cross flow plate heat exchanger, initially with finned surfaces on the exhaust gas side and then with 10 ppi and 40 ppi metal foam material substituting for the fins. Calculations were performed, using established heat exchanger design methodologies and recently published data from the literature to size the aforementioned configurations. The solutions provided reduce the overall heat exchanger size, with the plate and fin type consisting of plain fins presenting the minimum pressure drop (up to 98% reduction compared to the other configurations), and the 40 ppi metal foam being the most compact in terms of size and weight. Durability of the solutions is another issue which will be examined in a future investigation. However, coupling of the exhaust heat exchanger after a particulate trap appears to be the most promising solution to avoid clogging from soot accumulation.

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Section: Us Department Of Energy (Doe) Was Conducted By Mack Trucks Amentioning

confidence: 99%

Comparative design study of a diesel exhaust gas heat exchanger for truck applications with conventional and state of the art heat transfer enhancements

Mavridou

Mavropoulos

Bouris

et al. 2010

Applied Thermal Engineering

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“…However the increment of the bsfc of the new system (Rankine cycle and diesel engine) at a typical amount of 10% triggers automatically the need to reject increased amounts of heat to the environment through the low temperature reservoir system (condenser, engine radiator in the present case). Studies performed up to date by the authors [14] and other research groups [25][26][27]31] have demonstrated that when a Rankine cycle is coupled to an existing truck engine installation the use of a larger radiator, compared to the existing one, is necessary. The limitations for the dimensions of the radiator installed on a truck are clear and as a consequence the use of a second radiator appears a feasible solution to cover the increased heat rejection because of the bottoming cycle [32].…”

Section: General Descriptionmentioning

confidence: 99%

“…During the next years similar research programs were performed by other research institutes and vehicle manufacturers [22,23]. However, recently the solution of Rankine Cycle systems has increased its potential competitiveness in the market [24][25][26][27]. This is the result of technical advancements in a series of critical components for the operation of such an installation (heat exchanger, condenser, expander etc.…”

Section: General Descriptionmentioning

confidence: 99%

Potential for Improving HD Diesel Truck Engine Fuel Consumption Using Exhaust Heat Recovery Techniques

Hountalas¹,

Mavropoulos²

2010

New Trends in Technologies: Devices, Computer, Communication and Industrial Systems

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“…This is due to highly dynamic engine conditions, to interaction between the engine and the WHR system and to constraints, namely actuator limitations and safe operation. The control strategies dedicated to automotive applications are mostly based on a proportional-integral-derivative (PID) control type of approach [7][8][9][10][11][12]. However, this approach is most well established for single-input single-output systems.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of a Parallel Waste Heat Recovery System for Euro-VI Heavy-Duty Diesel Engines

et al. 2014

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This paper presents the modeling and control of a waste heat recovery system for a Euro-VI heavy-duty truck engine. The considered waste heat recovery system consists of two parallel evaporators with expander and pumps mechanically coupled to the engine crankshaft. Compared to previous work, the waste heat recovery system modeling is improved by including evaporator models that combine the finite difference modeling approach with a moving boundary one. Over a specific cycle, the steady-state and dynamic temperature prediction accuracy improved on average by 2% and 7%. From a control design perspective, the objective is to maximize the waste heat recovery system output power. However, for safe system operation, the vapor state needs to be maintained before the expander under highly dynamic engine disturbances. To achieve this, a switching model predictive control strategy is developed. The proposed control strategy performance is demonstrated using the high-fidelity waste heat recovery system model subject to measured disturbances from an Euro-VI heavy-duty diesel engine. Simulations are performed using a cold-start World Harmonized Transient cycle that covers typical urban, rural and highway driving conditions. The model predictive control strategy provides 15% more time in vapor and recovered thermal energy than a classical proportional-integral (PI) control strategy. In the case that the model is accurately known, the proposed control strategy performance can be improved by 10% in terms of time in vapor and recovered thermal energy. This is demonstrated with an offline nonlinear model predictive control strategy.Energies 2014, 7 6572

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Energy Recovery Systems for Engines

Cited by 24 publications

References 5 publications

Comparative design study of a diesel exhaust gas heat exchanger for truck applications with conventional and state of the art heat transfer enhancements

Comparative design study of a diesel exhaust gas heat exchanger for truck applications with conventional and state of the art heat transfer enhancements

Potential for Improving HD Diesel Truck Engine Fuel Consumption Using Exhaust Heat Recovery Techniques

Modeling and Control of a Parallel Waste Heat Recovery System for Euro-VI Heavy-Duty Diesel Engines

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