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

Giovannelli, Ambra

doi:10.1016/j.egypro.2018.10.069

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…The preliminary design for the power-block components was developed using the procedure described in. 29 After determining possible system layouts, both the rotational speed and the preliminary configuration of all components (eg, radial/axial machines, number of stages for each component) were selected according to similarity rules. However, this selection was not definitive.…”

Section: Design Methodologymentioning

confidence: 99%

Design of power‐blocks for medium‐scale supercritical carbon dioxide plants

et al. 2020

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For power production, the emerging technologies of supercritical carbon dioxide (S-CO 2) cycles show potential advantages if compared to conventional plants. The current bottleneck in exploiting such cycles is the development of novel components such as turbomachines and heat-exchangers. This paper focuses on the layout arrangement and machinery design of a novel powerblock for a 10 to 15 MW supercritical carbon dioxide plant. The applied design procedure involves 0D and 1D models implemented using an in-house Fortran code, and 3D computational fluid dynamics (CFD) analyses using ANSYS-CFX. Novel configurations of the power block were designed, starting with the same primary thermal source. At nominal conditions, expected overall output powers from 13.2 to 16.2 MW were found. Finally, some qualitative considerations were included in the discussion to compare the analysed arrangements.

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Section: Design Methodologymentioning

confidence: 99%

Design of power‐blocks for medium‐scale supercritical carbon dioxide plants

et al. 2020

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“…Unconventional WFs, as ORC fluids, pose several concerns for the turbomachinery design process [24]. For instance, R123 shows a higher specific volume increase through the expansion than conventional gases (e.g., air, exhausted gases).…”

Section: Turbine Design Methodologymentioning

confidence: 99%

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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“…Other specific feature of existing hydropower plants lies in the practical use of turbines with rotating blades [5] - [7]. To increase generated power, such blades are often made with large radial dimensions.…”

Section: Introductionmentioning

confidence: 99%

Conveyor-Type Small Hydropower Plant for Shallow River Waters

Beresnevich

Cerpinska

Irbe

et al. 2023

ETR

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This paper deals with the development of a small conveyor-type hydropower plant intended for operation in shallow river waters without construction of a dam. The proposed design offers a closed-shaped flattened conveyor equipped with flat-shaped blades. The conveyor is oriented perpendicular to the fluid flow. Several identical flat blades interacting with fluid flow are mounted on conveyor belt and move together with the belt in one straight line direction. Then after turning in the reversing mechanism, blades move in the opposite direction. The conveyor system has a built-in energy generator which drive shaft is connected with one of the reversing ends of the plant. Conveyor belt system dynamics analysis is performed on the base of equivalent model with one degree of freedom. The interaction of a moving conveyor flat blade in translation motion with fluid flow is studied by computer simulation with program Mathcad using a superposition principle. In accordance with this approach, a fast-chaotic motion of fluid particles (Brownian motion) is separated from the slow-directed flow motion, with the given average velocity. Optimization of system parameters (blade orientation angle to fluid flow, interaction constants of the braking generator) is performed, using a generated power as criterion. Simulation results confirm the serviceability and operational efficiency of the proposed hydropower plant in shallow river waters.

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

Cited by 9 publications

References 10 publications

Design of power‐blocks for medium‐scale supercritical carbon dioxide plants

Design of power‐blocks for medium‐scale supercritical carbon dioxide plants

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

Conveyor-Type Small Hydropower Plant for Shallow River Waters

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