References of "Podevin, Pierre"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailReciprocating expander for an exhaust heat recovery Rankine cycle for a passenger car application
Glavatskaya, Yulia; Podevin, Pierre; Lemort, Vincent ULg et al

in Energies (2012)

Nowadays, on average, two thirds of the fuel energy consumed by an engine is wasted through the exhaust gases and the cooling liquid. The recovery of this energy would enable a substantial reduction in ... [more ▼]

Nowadays, on average, two thirds of the fuel energy consumed by an engine is wasted through the exhaust gases and the cooling liquid. The recovery of this energy would enable a substantial reduction in fuel consumption. One solution is to integrate a heat recovery system based on a steam Rankine cycle. The key component in such a system is the expander, which has a strong impact on the system’s performance. A survey of different expander technologies leads us to select the reciprocating expander as the most promising one for an automotive application. This paper therefore proposes a steady-state semi-empirical model of the expander device developed under the EES (Engineering Equation Solver) environment. The ambient and mechanical losses as well as internal leakage were taken into account by the model. By exploiting the expander manufacturer data, all the parameters of the expander model were identified. The model computes the mass flow rate, the power output delivered and the exhaust enthalpy of the steam. The maximum deviation between predictions and measurement data is 4.7 %. A performance study of the expander is carried out and shows that the isentropic efficiency is quite high and increases with the expander rotary speed. The mechanical efficiency depends on mechanical losses which are quite high, approximately 90%. The volumetric efficiency was also evaluated. [less ▲]

Detailed reference viewed: 124 (8 ULg)
Full Text
Peer Reviewed
See detailHEAT RECOVERY SYSTEMS FOR PASSENGERS VEHICLES
Glavatskaya, Yulia ULg; Olivier, Gérard; Shonda, Osoko et al

in Scientific Bulletin, Automotive series = Buletin Ştiinţific, Seria Autovehicule Rutiere (2011, November 02)

is wasted through the cooling liquid and the exhaust gases. Thus, it would be possible to convert this wasted heat in order to improve the engine overall efficiency and reduce the fuel consumption of the ... [more ▼]

is wasted through the cooling liquid and the exhaust gases. Thus, it would be possible to convert this wasted heat in order to improve the engine overall efficiency and reduce the fuel consumption of the vehicle. This shows the big interest in energy recovery systems. This paper presents the various systems enabling the recovery of this energy. A Rankine cycle, widely used in the industry, is of particular interest. The efficiency of energy conversion varies from 5 to 20 % depending of its conception (working fluid, architecture, coupling…). Moreover, the layout of the Rankine cycle integrated within a vehicle depends on the choice of the working fluid as well as the technologies of the components i.e. the expander, the evaporator, the condenser and the pump. Within this context, the issue regarding the mass and the size of the system has to be considered. Finally, we present several solutions of Rankine systems for passenger car application and show each advantage and limits. [less ▲]

Detailed reference viewed: 54 (4 ULg)
Full Text
Peer Reviewed
See detailExhaust Heat Recovery Rankine System for passenger cars: modelling and design
Glavatskaya, Yulia; Lemort, Vincent ULg; Podevin, Pierre et al

(2011, July)

Nowadays, in average, one third of the fuel energy consumed by an engine is wasted throughout the exhaust gases. The recovery of this amount of energy would enable a reduction of the fuel consumption. One ... [more ▼]

Nowadays, in average, one third of the fuel energy consumed by an engine is wasted throughout the exhaust gases. The recovery of this amount of energy would enable a reduction of the fuel consumption. One solution is to integrate an exhaust heat recovery system based on a Rankine cycle. The first and most crucial step in the design is the definition of its architecture, the definition of the rated operating conditions and the sizing of the different components whilst considering the heat recovery over customer driving cycles. This paper presents a steady-state model of a steam Rankine cycle built by interconnecting sub-models of the heat exchangers, the pump and the expander. All the models were developed under EES (Engineering Equation Solver) environment. The models of heat exchanger are developed using the ε-NTU method. A heat exchanger is subdivided into three zones, each of them being characterized by both the exhaust gases and water side pressure drop as well as heat transfer coefficient. The evaluation of the two-phase zone pressure drop and heat transfer with respect to the vapour quality was carried out. The model of rotary piston expander describes the evolution of the fluid through the device and was split into three global steps: pressure drop across the supply port, isentropic and expansion at constant volume, internal and external heat transfers. The overall simulation model is finally used to predict the performance of the heat recovery system as the operating conditions and geometrical characteristics of each component are modified. An optimal sizing of the system is proposed and the underlying methodology is discussed. The analysis of the results pointed out that the levels of high/low pressure and the amount of superheat are the main parameters that impact the performance of the cycle and the sizing of the components. [less ▲]

Detailed reference viewed: 193 (8 ULg)