Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles

Fiaschi, Daniele; Manfrida, Giampaolo; Maraschiello, Francesco

doi:10.1016/j.apenergy.2012.02.033

Cited by 136 publications

(57 citation statements)

References 12 publications

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“…Głównym tematem badań różnego typu ekspanderów jest poprawa ich sprawności. Prace w tym zakresie są prowadzone zarówno na drodze badań eksperymentalnych [3][4][5] jak i obliczeń numerycznych [6][7][8]. Prace nad ekspanderami są prowadzone również w IMP PAN w Gdańsku.…”

Section: Wprowadzenieunclassified

Design and experimental investigation of the cogenerative domestic micro power plant with ORC system

Żywica¹,

Kiciński²,

Kaczmarczyk³

et al. 2015

Mechanik

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Section: Wprowadzenieunclassified

Design and experimental investigation of the cogenerative domestic micro power plant with ORC system

Żywica¹,

Kiciński²,

Kaczmarczyk³

et al. 2015

Mechanik

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“…Models for the design of turbines are available in the literature. Rahbar et al [98] and Fiaschi et al [99] proposed detailed models for radial turbines. Palumbo et al [100] published the mathematical model of a radial outflow turbine.…”

Section: Expander Selectionmentioning

confidence: 99%

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

et al. 2017

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Abstract:The Organic Rankine Cycle (ORC) is widely considered as a promising technology to produce electrical power output from low-grade thermal sources. In the last decade, several power plants have been installed worldwide in the MW range. However, despite its market potential, the commercialization of ORC power plants in the kW range did not reach a high level of maturity, for several reasons. Firstly, the specific price is still too high to offer an attractive payback period, and secondly, potential costumers for small-scale ORCs are typically SMEs (Small-Medium Enterprises), generally less aware of the potential savings this technology could lead to. When it comes to small-scale plants, additional design issues arise that still limit the widespread availability of the technology. This review paper presents the state of the art of the technology, from a technical and economic perspective. Working fluid selection and expander design are illustrated in detail, as they represent the bottleneck of the ORC technology for small-scale power production. In addition, a European market analysis is presented, which constitutes a useful instrument to understand the future evolution of the technology.

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“…Dolz et al [13] propose that the pre-design of turbomachinery must take real gas equations of state into consideration, because the specific energy deviation between real gas and perfect gas can be as large as 100%, which may lead to total wrong turbine preliminary design result. Fiaschi et al [19,20] propose an accurate 0-D model to design low size radial ORC turbines. Different methods for the design of radial turbines were screened, with special attention paid to the estimation of losses.…”

Section: Introductionmentioning

confidence: 99%

“…As the organic fluid properties are totally different from air, these researches are mainly divided into two technical routes. One route focuses on forward design, including preliminary design of geometry parameters and aerodynamic design of blade profiles [12][13][14][15][16][17][18][19][20][21]. Dolz et al [13] propose that the pre-design of turbomachinery must take real gas equations of state into consideration, because the specific energy deviation between real gas and perfect gas can be as large as 100%, which may lead to total wrong turbine preliminary design result.…”

Section: Introductionmentioning

confidence: 99%

Similarity Theory Based Radial Turbine Performance and Loss Mechanism Comparison between R245fa and Air for Heavy-Duty Diesel Engine Organic Rankine Cycles

Zhang

Zhuge

Zhang

et al. 2017

Entropy

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Organic Rankine Cycles using radial turbines as expanders are considered as one of the most efficient technologies to convert heavy-duty diesel engine waste heat into useful work. Turbine similarity design based on the existing air turbine profiles is time saving. Due to totally different thermodynamic properties between organic fluids and air, its influence on turbine performance and loss mechanisms need to be analyzed. This paper numerically simulated a radial turbine under similar conditions between R245fa and air, and compared the differences of the turbine performance and loss mechanisms. Larger specific heat ratio of air leads to air turbine operating at higher pressure ratios. As R245fa gas constant is only about one-fifth of air gas constant, reduced rotating speeds of R245fa turbine are only 0.4-fold of those of air turbine, and reduced mass flow rates are about twice of those of air turbine. When using R245fa as working fluid, the nozzle shock wave losses decrease but rotor suction surface separation vortex losses increase, and eventually leads that isentropic efficiencies of R245fa turbine in the commonly used velocity ratio range from 0.5 to 0.9 are 3%-4% lower than those of air turbine.

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Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles

Cited by 136 publications

References 12 publications

Design and experimental investigation of the cogenerative domestic micro power plant with ORC system

Design and experimental investigation of the cogenerative domestic micro power plant with ORC system

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

Similarity Theory Based Radial Turbine Performance and Loss Mechanism Comparison between R245fa and Air for Heavy-Duty Diesel Engine Organic Rankine Cycles

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