Numerical characterization of a γ-Stirling engine considering losses and interaction between functioning parameters

Hachem, Houda; Gheith, Ramla; Aloui, Fethi; Nasrallah, Sassi Ben

doi:10.1016/j.enconman.2015.02.065

Cited by 32 publications

(25 citation statements)

References 22 publications

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“…Based on previous energetic analyses described in the literature [27,28], two exergetic models of a Stirling and of an Ericsson engine were established. The global energetic and exergetic performances of both engines were evaluated.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the influence of initial filling pressure, engine speed, cooling water flow rates and heating temperature on the engine performances (brake power and efficiency) has been highlighted. More recently, Hachem et al [27] presented a global energetic modelling of the same Stirling engine. They showed that the engine rotation speed have an optimum value that guarantees the best Stirling engine performances.…”

Section: Geometries and Working Conditionsmentioning

confidence: 99%

“…When considering the control volume presented in Figure 3, with entering energy fluxes assumed positive, the energy balance equation on the hot air engine is written as follows: The hypotheses of the energetic models described by Hachem et al [27] for the Stirling engine and by Creyx et al [28] for the Ericsson engine are assumed. In this modelling, the working air is considered perfect.…”

Section: Energy Balance On the Hot Air Enginesmentioning

confidence: 99%

See 2 more Smart Citations

Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine

Hachem

Creyx

Gheith

et al. 2015

Entropy

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Abstract:In this paper, a comparison of exergetic models between two hot air engines (a Gamma type Stirling prototype having a maximum output mechanical power of 500 W and an Ericsson hot air engine with a maximum power of 300 W) is made. Referring to previous energetic analyses, exergetic models are set up in order to quantify the exergy destruction and efficiencies in each type of engine. The repartition of the exergy fluxes in each part of the two engines are determined and represented in Sankey diagrams, using dimensionless exergy fluxes. The results show a similar proportion in both engines of destroyed exergy compared to the exergy flux from the hot source. The compression cylinders generate the highest exergy destruction, whereas the expansion cylinders generate the lowest one. The regenerator of the Stirling engine increases the exergy resource at the inlet of the expansion cylinder, which might be also set up in the Ericsson engine, using a preheater between the exhaust air and the compressed air transferred to the hot heat exchanger. OPEN ACCESSEntropy 2015, 17 7332

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Section: Discussionmentioning

confidence: 99%

Section: Geometries and Working Conditionsmentioning

confidence: 99%

Section: Energy Balance On the Hot Air Enginesmentioning

confidence: 99%

See 1 more Smart Citation

Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine

Hachem

Creyx

Gheith

et al. 2015

Entropy

Self Cite

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“…1. It should be noted that the regenerator element can be removed from the FPSE components, but the existence of the regenerator will undoubtedly enhance the thermal efficiency (from now on efficiency) of these types of engines [26]. FPSEs are designed according to the Stirling cycle.…”

Section: Free-piston Stirling Engines (Fpses)mentioning

confidence: 99%

Higher order modeling of a free-piston Stirling engine: analysis and experiment

Zare

Shourangiz-Haghighi

2018

Int J Energy Environ Eng

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This paper focuses on higher order modeling and design of the free-piston Stirling engine (FPSE) based on Ant Colony Optimization (ACO). First, the governing thermodynamics and dynamical equations of the engine have been derived. Then, the design parameters of the engine are selected taking into account the finite heat transfer coefficient (resulting in a fifth-order model) and pressure drop (resulting in a sixth-order model) in the dynamical system and the corresponding differential equations are derived in detail. In the following, the mentioned methods and their performance in modeling the FPSE dynamics are investigated. The simulated results show that the effect of the pressure drop on the places of the closed-loop poles of the system is not significant, while the heat transfer coefficient has a considerable effect on the engine dynamics. Accordingly, a fifth-order model along with ACO algorithm is proposed to justify the FPSE behavior. To validate the presented modeling scheme, the prototype engine SUTECH-SR-1 was experimented. It is found that the values of parameters obtained from the proposed design method are close to those of the experiment. Besides, the presented higher order model predicts the engine behavior with an acceptable accuracy through which the validity of the design technique is affirmed. Initial pressure of working gas (Pa) P w Power generation (J/s) P Nonlinear pressure (Pa) R Ideal gas constant J kgVolume of expansion space m

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“…They presented thermodynamic optimization of the Ross Yoke engine based on a numerical model integrating the internal and external irreversibility. Hachem et al [9] extended the Urieli quasi-steady model by adding thermal and mechanical losses to analyze the effect of heat exchanger efficiency on the performance of a gamma-type Stirling engine. The obtained results demonstrated that, for a high initial filling pressure, the brake power is more sensitive to the rotational speed as well as the hot end temperature.…”

Section: Introductionmentioning

confidence: 99%

From Beale Number to Pole Placement Design of a Free Piston Stirling Engine

Zare

Omidvar

2017

Archive of Mechanical Engineering

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In this paper, pole placement-based design and analysis of a free piston Stirling engine (FPSE) is presented and compared to the well-defined Beale number design technique. First, dynamic and thermodynamic equations governing the engine system are extracted. Then, linear dynamics of the free piston Stirling engine are studied using dynamic systems theory tools such as root locus. Accordingly, the effects of variations of design parameters such as mass of pistons, stiffness of springs, and frictional damping on the locations of dominant closed-loop poles are investigated. The design procedure is thus conducted to place the dominant poles of the dynamic system at desired locations on the s-plane so that the unstable dynamics, which is the required criterion for energy generation, is achieved. Next, the closed-loop poles are selected based on a desired frequency so that a periodical system is found. Consequently, the design parameters, including mass and spring stiffness for both power and displacer pistons, are obtained. Finally, the engine power is calculated through the proposed control-based analysis and the result is compared to those of the experimental work and the Beale number approach. The outcomes of this work clearly reveal the effectiveness of the control-based design technique of FPSEs compared to the well-known approaches such as Beale number.

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Numerical characterization of a γ-Stirling engine considering losses and interaction between functioning parameters

Cited by 32 publications

References 22 publications

Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine

Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine

Higher order modeling of a free-piston Stirling engine: analysis and experiment

From Beale Number to Pole Placement Design of a Free Piston Stirling Engine

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