Design of an Expander for Internal Power Recovery in Cryogenic Cooling Plants

Giovannelli, Ambra; Archilei, Erika Maria

doi:10.1016/j.egypro.2015.12.016

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Although several researchers tried to address this challenging technical aspect [26][27][28], the uncertainty related to the application of global models in the design process of ORC turbines leads to more detailed procedures which involve a preliminary layout setup (1-D and 2-D models at the mean line) and then, the utilization of fully 3-D numerical analyses. With respect to small ORC radial turbomachines, previous applications of such design methodology are reported in Giovannelli et al [29,30].…”

Section: Turbine Design Methodologymentioning

confidence: 99%

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Two-Stage Radial Turbine for a Small Waste Heat Recovery Organic Rankine Cycle (ORC) Plant

2020

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Looking at the waste heat potential made available by industry, it can be noted that there are many sectors where small scale (< 100 kWe) organic Rankine cycle (ORC) plants could be applied to improve the energy efficiency. Such plants are quite challenging from the techno-economic point of view: the temperature of the primary heat source poses a low cutoff to the system thermodynamic efficiency. Therefore, high-performance components are needed, but, at the same time, they have to be at low cost as possible to assure a reasonable payback time. In this paper, the design of a two-stage radial in-flow turbine for small ORC industrial plants is presented. Compared to commonly applied mono-stage expanders (both volumetric and dynamic), this novel turbine enables plants to exploit higher pressure ratios than conventional plants. Thus, the theoretical limit to the cycle efficiency is enhanced with undoubted benefits on the overall ORC plant performance. The design process involved 1D/2D models as well as 3D Computational Fluid Dynamic ones. After the design of the preliminary configuration, sensitivity analyses were carried out varying the most relevant geometric parameters for design performance improvement. Thereafter, the stages were both analyzed in off-design conditions giving their performance maps. Moreover, a stage stacking procedure was applied to obtain the overall turbine behavior.

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Section: Turbine Design Methodologymentioning

confidence: 99%

“…13, 1054 5 of 18respect to small ORC radial turbomachines, previous applications of such design methodology are reported in Giovannelli et al[29,30].…”

mentioning

confidence: 99%

Two-Stage Radial Turbine for a Small Waste Heat Recovery Organic Rankine Cycle (ORC) Plant

2020

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Internal Power Recovery Systems for Cryogenic Cooling Plants: Secondary Compressor Development

2016

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Refrigeration systems consume a relevant amount of electrical power worldwide. For this reason, in the last decades, several energy saving techniques have been proposed to reduce the power demand of such plants. The present paper deals with the development of an innovative internal power recovery system for industrial cryogenic cooling plants. Such an innovative system consists in a Compressor-Expander Group (CEG) for internal power recovery. In particular, the paper is focused on the development of the CEG compressor, which has to pre-compress the refrigerant main flow before the fluid enters the main compressor. The machine has been re-designed, modifying a centrifugal compressor for automotive turbocharging. To verify the performance and suggest improvements, a numerical fluid dynamic model has been set up and the commercial Ansys-CFX software has been utilized to perform steady-state 3D simulations. Expected performance of the secondary compressor are presented and discussed in this paper

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Development of turbomachines for renewable energy systems and energy-saving applications

Giovannelli

2018

Energy Procedia

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Design of an Expander for Internal Power Recovery in Cryogenic Cooling Plants

Cited by 4 publications

References 5 publications

Two-Stage Radial Turbine for a Small Waste Heat Recovery Organic Rankine Cycle (ORC) Plant

Two-Stage Radial Turbine for a Small Waste Heat Recovery Organic Rankine Cycle (ORC) Plant

Internal Power Recovery Systems for Cryogenic Cooling Plants: Secondary Compressor Development

Development of turbomachines for renewable energy systems and energy-saving applications

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