Optimization of a dual free piston Stirling engine

Boucher, Julien; Lanzetta, François; Nika, Philippe

doi:10.1016/j.applthermaleng.2006.10.021

Cited by 55 publications

(21 citation statements)

References 6 publications

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“…The free-piston Stirling concept was introduced by Beal in 1969 [11]. In recent years, it has drawn worldwide attentions due to the urgent need for renewable energy technologies [12][13][14][15][16][17][18]. In the 1980s, several duplex Stirling machines were developed by Sunpower Inc. and while experimental results demonstrated their feasibility, detailed parameters of these machines and quantitative results were not presented [19][20][21].…”

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confidence: 99%

Parameter sensitivity analysis of duplex Stirling coolers

Luo

Dai

et al. 2017

Applied Energy

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Duplex Stirling coolers are external heat-driven regenerative machines that obtain cooling power with high efficiency and reliability. Although the technology is promising, little progress has been reported since they were invented. This paper examines the influence of system parameters on the cooling performance of a duplex Stirling cooler. The study showed that the system was sensitive to a number of parameters, as slight changes in these parameters resulted in the cooling performance deviating significantly from the design. In practice, deviation of system parameters from the design is inevitable. Therefore, actual systems often produce unexpected performance, and this is likely the main obstacle to utilizing such a system in practical applications. To overcome this disadvantage, two methods were proposed to allow the power piston to move with a constant displacement, which may allow for duplex Stirling coolers to become a more widely used cooling system. A new

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confidence: 99%

Parameter sensitivity analysis of duplex Stirling coolers

Luo

Dai

et al. 2017

Applied Energy

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“…The results from the piston displacement at steady state were compared to the experimental results from a prototype and showed a good agreement, with an error of 3%. Optimization was conducted on a dual FPSE designed for use as a micro-CHP (Combined Heat and Power) system for heat and power generation by Boucher et al [8]; a theoretical study of the dynamic characteristics of the engine connected to a linear alternator was presented, and the working gas non-linear effects and electromagnetic forces were considered in the simulation. Mikalsen and Roskilly [9] presented an investigation into a spark ignited free piston engine generator using computational fluid dynamics (CFD) and compared the output to a conventional engine.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance of Heat Exchangers in a Free Piston Stirling Engine

Sowale

Kolios

2018

Energies

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There is an increasing request in energy recovery systems that are more efficient, environmentally friendly and economical. The free piston Stirling engine has been investigated due to its structural simplicity and high efficiency, coupled with its cogeneration ability. This study presents the numerical investigation of quasi-steady model of a gamma type free piston Stirling engine (FPSE), including the thermodynamic analysis of the heat exchangers. Advanced thermodynamic models are employed to derive the initial set of operational parameters of the FPSE due to the coupling of the piston's (displacer and piston) dynamics and the working process. The proximity effect of the heater and cooler on the regenerator effectiveness in relation to the heat losses, output power, net work and thermal efficiency of the FPSE are also observed and presented in this study. It can be observed that at temperatures of 541.3 • C and 49.8 • C of the heater and cooler, respectively, with heater volume of 0.004 m 3 , regenerator volume of 0.003 m 3 and cooler volume of 0.005 m 3 , the FPSE produced an output performance of 996.7 W with a thermal efficiency of 23% at a frequency of 30 Hz. This approach can be employed to design effective high performance FPSE due to their complexity and also predict a satisfactory performance.

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“…Kinematic engines use kinematic drive mechanisms to regulate the volume variations in the working spaces. Free Piston machines use gas pressure variations in the cycle to control the movement of the displacer piston [13][14][15]. These engines were pioneered in the 1960's by William Beale and offer their own set of advantages, particularly in relation to reduction of friction losses in the drive.…”

Section: Stirling Engines -State Of the Art And Limitationsmentioning

confidence: 99%