Numerical study of the pressure drop phenomena in wound woven wire matrix of a Stirling regenerator

Costa, S.; Barrutia, Harritz; Esnaola, J.A.; Tutar, Mustafa

doi:10.1016/j.enconman.2012.10.014

Cited by 95 publications

(38 citation statements)

References 15 publications

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“…The authors verify experimentally the heat exchange and the pressure drop inside wowed matrix regenerators under oscillating flow conditions and, consequently, formulate a full set of empirical correlations. Later, Costa et al confirm these correlations by numerical means [17]. Recently, Cheng and Yang [18] analyze the effects of the geometrical parameters on the shaft work for alpha, beta and gamma engine configurations.…”

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confidence: 65%

Experimental and numerical study of a micro-cogeneration Stirling unit under diverse conditions of the working fluid

et al. 2015

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In the scenario of micro-cogeneration (or micro Combined Heat and Power, micro-CHP), Stirling units are a promising technology for residential applications because of high total efficiencies, favorable ratios of thermal to electrical powers and lower emissions compared to reciprocating engines and micro gas turbines. 1 The present work covers the experimental and numerical analyses of a natural gas-fired commercial unit capable of generating 8 kW of hot water (up to 15 kW with an auxiliary burner) and 1 kW of electricity. Although featuring in general a low electrical efficiency, these micro-cogeneration units are able to recover heat with a high thermal efficiency, thus qualifying positively in terms of primary energy savings. Moreover, the thermal-to-electrical power ratios of 8-to-1 (and 15-to-1 with the additional burner) are well suited for covering simultaneously the thermal and electrical loads of typical residences in continental climates. ☆This article is based on a short proceedings paper in Energy Procedia Volume 161 (2014). It has been substantially modified and extended, and has been subject to the normal peer review and revision process of the journal. This paper is included in the Special Issue of ICAE2014 edited by Prof. J Yan, Prof. DJ Lee, Prof. SK Chou, and Prof. U Desideri. AbstractMicro-cogeneration Stirling units are promising for residential applications because of high total efficiencies, favorable ratios of thermal to electrical powers and low CO as well as NO x emissions. This work focuses on the experimental and the numerical analysis of a commercial unit generating 8 kW of hot water (up to 15 kW with an auxiliary burner) and 1 kW of electricity burning natural gas. In the experimental campaign, the initial pressure of the working fluid is changed in a range from 9 to 24 bar g -20 bar g being the nominal value -while the inlet temperature of the water loop and its mass flow rate are kept at the nominal conditions of, respectively, 50 °C and 0.194 kg/s.The experimental results indicate clearly that the initial pressure of the working fluid -Nitrogen -affects strongly the net electrical power output and efficiency. The best performance for the output and efficiency of 943 W and 9.6%(based on the higher heating value of the burnt natural gas) are achieved at 22 bar g . On the other hand, the thermal power trend indicates a maximum value of 8420 W at the working pressure of 24 bar g , which corresponds to a thermal efficiency of 84.7% (again based on higher heating value). Measurements are coupled to a detailed model based on a modification of the work by Urieli and Berchowitz. Thanks to the tuning with the experimental results, the numerical model allows investigating the profiles of the main thermodynamic parameters and heat losses during the cycle, as well as estimating those physical properties that are not directly measurable. The major losses turn to be the wall parasitic heat conduction from heater to cooler and the non-unitary effectiveness of the regenerator.

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confidence: 65%

Experimental and numerical study of a micro-cogeneration Stirling unit under diverse conditions of the working fluid

et al. 2015

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“…Numerous research available in literature have been carried out on pressure drop in regenerator. A range of friction factor formulas for regenerator is summarized in Table …”

Section: Thermodynamic Modelsmentioning

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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“…He concluded that a regenerator piston having a square mesh gives 20% more work and 10% more efficiency than the GPU3 engine. To reduce the cost of the regenerator, Costa et al [19] used wound woven wire regenerators matrix instead of woven wire screen stacked regenerator. They conducted a numerical study assuming laminar flow at low Reynolds number to determine the friction factor correlation for wound woven wire regenerators matrix.…”

Section: Introductionmentioning

confidence: 99%

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

Hachem

Gheith²,

Aloui³

et al. 2015

Energy Conversion and Management

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Numerical study of the pressure drop phenomena in wound woven wire matrix of a Stirling regenerator

Cited by 95 publications

References 15 publications

Experimental and numerical study of a micro-cogeneration Stirling unit under diverse conditions of the working fluid

Experimental and numerical study of a micro-cogeneration Stirling unit under diverse conditions of the working fluid

A comprehensive review on modeling and performance optimization of Stirling engine

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

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