Free piston Stirling engines: A review

Zare, Shahryar; Tavakolpour-Saleh, A.R.

doi:10.1002/er.4533

Cited by 79 publications

(42 citation statements)

References 62 publications

(136 reference statements)

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“…Other relevant technologies that have been developed include the Kalina or air‐bottoming cycle and carbon dioxide‐based power cycles . For small‐scale kilowatt‐range power requirements, Stirling engines and small ORC systems are currently under development and approaching the application phase. However, the vast majority of waste thermal energy sources are widely dispersed and at relatively low temperatures (below 100 °C) or are most suitable for micro‐scale exploitation in the milliwatt to 1 kW range.…”

Section: Introductionmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Section: Introductionmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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“…Generally, the application of FPSE is limited to the aerospace industry. A detailed review thoroughly discussing the working, applications, and utilization of FPSEs is recently carried out by Zare and Tavakolpour‐Saleh . Readers interested in the FPSEs are suggested to refer to the aforementioned reference.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on modeling and performance optimization of Stirling engine

et al. 2020

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Summary Modeling with optimization has become a ubiquitous practice in the field of Stirling engine. A plethora of studies in the literature is dedicated in developing a feasible optimized model that can precisely predict the performance of Stirling engine. Hence, the purpose of this article is to compile and expansively review the thermodynamic models and optimization efforts made in pursuit of performance enhancement of the Stirling engine. An extensive range of models available in the literature is painstakingly discussed. Likewise, a wide variety of available optimization techniques spanning from conventional experimental and univariate methods to more complex multiobjective optimization approach are critically reviewed. A comparative analysis of the models is carried out based on the accuracy of their predictability of the performance of Stirling engines. Results obtained from the models are validated through the experimental data of the GPU‐3 Stirling engine prototype. Several optimization techniques are investigated based on the effective and efficient optimization of operating and geometric parameters of the Stirling engine. The review concluded that the Comprehensive Polytropic Model of Stirling engine (CPMS) demonstrated better accuracy in comparison with other models. In addition, the multiobjective particle swarm optimization (MOPSO) technique was found to be effective and computationally efficient.

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“…In addition, the long and narrow cylinders of the multicylinder engine open new possibilities for thermal coupling to solar collectors. However, many other free‐piston configurations with different geometry and applications exist …”

Section: Introductionmentioning

confidence: 99%

A new duplex Stirling engine concept for solar‐powered cooling

Daoud

Friedrich

2020

Int J Energy Res

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The global cooling demand is one of the fastest growing energy demands and is putting a strain on the electricity infrastructure. Solar-powered cooling could provide most of the cooling demand due to the coincidence of the cooling demand and the solar irradiance. In particular, the solar-powered Stirling-cycle cooler has low maintenance requirement, high theoretical efficiency, and use of environmentally friendly gases. However, Stirling-cycle coolers are expensive due to high driving temperatures, complex heat exchangers, and expensive solar tracking so that they have so far only been successful at high-temperature difference applications. This study introduces a novel directly coupled solar Stirling cooler for which the hot engine cylinders are deployed inside evacuated tube collectors. The machine uses air as working fluid, and its driving mechanism is based on the free-piston, balanced compound technology that was patented by Finkelstein. A second-order mathematical model is used to investigate the performance of the machine for different cylinder arrangements, gas leakage rates, chilling temperatures, and solar irradiance. In addition, the regenerators are optimised to maximise the cold production. It is shown that mechanical frictions can be reduced to 20% by selecting an appropriate cylinder arrangement. The solar cooler achieves a maximum cold production rate of 367.5 W/m 2 without using external heat exchangers at load temperature of 7 C, which is comparable with photovoltaic powered coolers.In addition, the machine is relatively simple, has safe and quiet operation, uses ambient air as working gas, and is able to produce a wide range of chilling including sub-zero temperatures without changing the working gas. The direct thermal coupling of the Stirling cooler to evacuated tube collectors significantly reduces the complexity of the machine and removes intermediate heat transfer steps which reduce the performance. Thus, the suggested cooling technology has great potential for solar refrigeration, especially for low power and near ambient cooling.

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Free piston Stirling engines: A review

Cited by 79 publications

References 62 publications

Energy Applications of Magnetocaloric Materials

Energy Applications of Magnetocaloric Materials

A comprehensive review on modeling and performance optimization of Stirling engine

A new duplex Stirling engine concept for solar‐powered cooling

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