Journal ArticleDOI
Preliminary Design of a Centrifugal Turbine for Organic Rankine Cycle Applications
TLDR
In this article, a critical evaluation of the feasibility of multistage transonic centrifugal turbines for ORC systems is presented, and a two-step design procedure, specifically oriented to ORC turbines, is developed.Abstract:
Organic rankine cycles (ORC) are renowned to be attractive energy conversion systems for the thermal energy sources in the small-to-medium power range. A critical component in the ORC technology is the turbo-expander; the difficulties involved in the accurate thermodynamic modeling of organic fluids and, especially, the complex gasdynamic phenomena that are commonly found in ORC turbines may result in relatively low efficiency and in performance reduction at partial loads. In this perspective, a relevant path of development can be outlined in the evaluation of nonconventional turbine architectures, such as the radial-outward or centrifugal turbine. In the present work, a critical evaluation of the feasibility of multistage transonic centrifugal turbines for ORC systems is presented. To support this study, a two-step design procedure, specifically oriented to ORC turbines, was developed. The methodology includes a 1D mean-line code coupled to an external optimizer to perform a preliminary design of the machine. The selected configurations are then verified with a CFD (computational fluid dynamics)-based throughflow solver, able to deal with any flow regime and to treat fluids described by arbitrary equations of state. The overall procedure is applied to the design of two different turbines of the same target power of about 1 MW, the former representing a transonic six-stage turbine and the latter a supersonic three-stage turbine. The two machines are characterized by very different shape and comparable performances. The results are extensively discussed in terms of both overall data and detailed flow fields.read more
Citations
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Journal ArticleDOI
Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review
TL;DR: In this paper, the state-of-the-art of the organic rankine cycle (ORC) technology for small-scale power plants is presented from a technical and economic perspective.
Journal ArticleDOI
Three-dimensional off-design numerical analysis of an organic Rankine cycle radial-inflow turbine
Emilie Sauret,YuanTong Gu +1 more
TL;DR: In this article, the authors present preliminary 3D numerical simulations of a high-density radial-inflow ORC turbine in sensible geothermal conditions, using the refrigerant R143a as the high density working fluid.
Journal ArticleDOI
Expansion devices for organic Rankine cycle (ORC) using in low temperature heat recovery: A review
TL;DR: The review of expansion devices for organic Rankine cycle (ORC) systems was presented and it is expected that the review presented here can summarize what was done before and will provide the investigator with the knowledge and ideas about how to choose and improve the performance of Expansion devices for ORC systems.
Journal ArticleDOI
Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines
TL;DR: In this article, the optimal working fluid selection for organic Rankine cycle recovering heat from heavy-duty internal combustion engines is addressed, which includes both pure fluids, including recently synthesized refrigerants, and binary mixtures.
Journal ArticleDOI
Preliminary design and off-design performance analysis of an Organic Rankine Cycle radial-inflow turbine based on mathematic method and CFD method
TL;DR: In this paper, the authors carried out the full design process of the R134a radial-inflow ORC turbine and performed a turbine model based on 1D analysis for several operating conditions including off-design conditions.
References
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Book
Fluid mechanics, thermodynamics of turbomachinery
TL;DR: The Fluid Mechanics and Thermodynamics of Turbomachines (FLMTH) as discussed by the authors is a classic text in the field of turbomachines, which has been used as a core text in both undergraduate and graduate level courses.
Book
The design of high-efficiency turbomachinery and gas turbines
TL;DR: In this article, the authors present a reference record created on 2005-11-18, modified on 2016-08-08, using the reference record from the Reference Record Reference Record.
Journal ArticleDOI
Performance Estimation of Axial Flow Turbines
H. R. M. Craig,H. J. A. Cox +1 more
TL;DR: In this article, a comprehensive method of estimating the performance of axial flow steam and gas turbines is presented, based on analysis of linear cascade tests on blading, on a number of turbine test results, and on air tests of model casings.
Journal ArticleDOI
Stator/rotor interaction in a transonic turbine
TL;DR: In this paper, the stator/rotor interaction in a highly loaded transonic first turbine stage is analyzed using time-incline d computational planes to allow the analysis of cases in which the ratio of stator and rotor pitches is not equal to unity or the ratios of two small integers.
Journal ArticleDOI
Candidate radial-inflow turbines and high-density working fluids for geothermal power systems
Emilie Sauret,Andrew Rowlands +1 more
TL;DR: In this paper, the authors present the rationale for the use of radial-inflow turbines for ORC applications and the preliminary design of several radialinflow machines based on a number of promising ORC systems that use five different working fluids.
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