The Controllability of Vapour Based Thermal Recovery Systems in Vehicles

Stobart, Richard; Hounsham, Sandra; Weerasinghe, Rohitha

doi:10.4271/2007-01-0270

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…There are several technologies for the recovery of the wasted energy of a combustion engine [2]. Rankine cycle systems show a good potential for the waste heat recovery of light-duty trucks [3][4][5][6][7] as well as passenger vehicles [8][9][10][11][12][13][14]. One of the promising solutions is the steam Rankine system [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

et al. 2012

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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 Engineering Equation Solver (EES) environment. The ambient and mechanical losses as well as internal leakage were taken into account by the model. By exploiting the expander manufacturer’s 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

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Section: Introductionmentioning

confidence: 99%

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

et al. 2012

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“…Two main types of expanders have been applied in Rankine cycle applications that are of two types: first one is the velocity type, such as axial turbines and radial-flow turbines; the other is positive displacement type, such as scroll expanders, screw expanders, piston expanders, and rotary vane expanders [15]. These expanders feed off a steam reservoir courtesy of heat recovery in a bottoming cycle [16,17].…”

Section: Waste Heat Recoverymentioning

confidence: 99%

Small Engines as Bottoming Cycle Steam Expanders for Internal Combustion Engines

Weerasinghe

Hounsham

2017

Journal of Combustion

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Heat recovery bottoming cycles for internal combustion engines have opened new avenues for research into small steam expanders (Stobart and Weerasinghe, 2006). Dependable data for small steam expanders will allow us to predict their suitability as bottoming cycle engines and the fuel economy achieved by using them as bottoming cycles. Present paper is based on results of experiments carried out on small scale Wankel and two-stroke reciprocating engines as air expanders and as steam expanders. A test facility developed at Sussex used for measurements is comprised of a torque, power and speed measurements, electronic actuation of valves, synchronized data acquisition of pressure, and temperatures of steam and inside of the engines for steam and internal combustion cycles. Results are presented for four engine modes, namely, reciprocating engine in uniflow steam expansion mode and air expansion mode and rotary Wankel engine in steam expansion mode and air expansion mode. The air tests will provide base data for friction and motoring effects whereas steam tests will tell how effective the engines will be in this mode. Results for power, torque, and p-V diagrams are compared to determine the change in performance from air expansion mode to steam expansion mode.

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“…A more generic overview of control issues for Rankine-based WHR systems in vehicles is given in [13]. The impact of architecture on control authority is underlined, as well as the potential of using certain physical variables, such as system pressure, as actuators to improve system efficiency or energy recovery.…”

Section: State Of the Artmentioning

confidence: 99%

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

Tona

Peralez

Sciarretta

2012

2012 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

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Abstract-Rankine-cycle waste heat recovery systems for automotive applications have been the focus of intensive research in recent years, as they seem to offer considerable potential for fuel consumption reduction. Because of the highly transient conditions they are subject to, control plays a fundamental role to enable viability and efficiency of those systems. Yet, surprising little research has been devoted to this topic. This paper illustrates the design of a practical supervision and control system for a pilot Rankine steam process for exhaust gas heat recovery from a spark-ignition engine. The proposed control strategy for power production focuses more on ensuring continuity of operation than on the pursuit of optimality. The resulting decentralized control system is implemented via two anti-wind up controllers with feedforward action.Performance has been assessed in simulation on a motorway driving cycle using real engine exhaust data. Despite very transient exhaust gas conditions, we show that the expander can produce power throughout the cycle, avoiding start-stop procedures, which would greatly reduce the global efficiency.

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The Controllability of Vapour Based Thermal Recovery Systems in Vehicles

Cited by 9 publications

References 6 publications

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application

Small Engines as Bottoming Cycle Steam Expanders for Internal Combustion Engines

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

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