DESIGN, OPTIMIZATION AND EXPERIMENTAL INVESTIGATION OF VARIOUS SMALL-SCALE ORC EXPANDERS IN A BIOMASS COGENERATION PLANT

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00385576" target="_blank" >RIV/68407700:21220/25:00385576 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21720/25:00385576

Výsledek na webu

<a href="https://lutpub.lut.fi/bitstream/handle/10024/170511/ORC2025_proceedings_public.pdf?sequence=1&isAllowed=y" target="_blank" >https://lutpub.lut.fi/bitstream/handle/10024/170511/ORC2025_proceedings_public.pdf?sequence=1&isAllowed=y</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

DESIGN, OPTIMIZATION AND EXPERIMENTAL INVESTIGATION OF VARIOUS SMALL-SCALE ORC EXPANDERS IN A BIOMASS COGENERATION PLANT

Popis výsledku v původním jazyce

This paper presents the design, optimization, and experimental investigation of three small-scale ORC expanders — one rotary vane expander and two turbines (a single-stage axial impulse turbine and a radial re-entry turbine called Elektra) — developed for an operational biomass-fired CHP unit. All expanders were tested in a 120 kWth woodchip-fired ORC plant at CTU UCEEB. The rotary vane expander demonstrated broad operational flexibility, moderate efficiency sensitivity to boundary conditions, and over 10,000 hours of run time, though it requires periodic maintenance. The Elektra turbine, designed as a low-rpm standard generator alternative using in-house 1D meanline modeling and CFD optimization, achieved around 34.8% efficiency at 3,000 rpm. The axial impulse turbine, optimized via genetic algorithms, reached over 61% efficiency and 7 kW output at 14,000 rpm. Techno-economic analysis showed that the rotary vane expander achieved the lowest specific plant costs, while the axial turbine delivered the highest efficiency at increased cost. The Elektra turbine, despite its low capital cost, exhibited limited performance and the highest plant-specific costs. Experimental results validated the design tools and provided comparative insight into expander suitability for small-scale CHP applications.

Název v anglickém jazyce

DESIGN, OPTIMIZATION AND EXPERIMENTAL INVESTIGATION OF VARIOUS SMALL-SCALE ORC EXPANDERS IN A BIOMASS COGENERATION PLANT

Popis výsledku anglicky

This paper presents the design, optimization, and experimental investigation of three small-scale ORC expanders — one rotary vane expander and two turbines (a single-stage axial impulse turbine and a radial re-entry turbine called Elektra) — developed for an operational biomass-fired CHP unit. All expanders were tested in a 120 kWth woodchip-fired ORC plant at CTU UCEEB. The rotary vane expander demonstrated broad operational flexibility, moderate efficiency sensitivity to boundary conditions, and over 10,000 hours of run time, though it requires periodic maintenance. The Elektra turbine, designed as a low-rpm standard generator alternative using in-house 1D meanline modeling and CFD optimization, achieved around 34.8% efficiency at 3,000 rpm. The axial impulse turbine, optimized via genetic algorithms, reached over 61% efficiency and 7 kW output at 14,000 rpm. Techno-economic analysis showed that the rotary vane expander achieved the lowest specific plant costs, while the axial turbine delivered the highest efficiency at increased cost. The Elektra turbine, despite its low capital cost, exhibited limited performance and the highest plant-specific costs. Experimental results validated the design tools and provided comparative insight into expander suitability for small-scale CHP applications.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/TO01000160" target="_blank" >TO01000160: Optimised expanders for small-scale distributed energy systems</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 8th International Seminar on ORC Power Systems

ISBN

978-952-412-288-7

ISSN

2243-3376

e-ISSN

2243-3376

Počet stran výsledku

10

Strana od-do

92-101

Název nakladatele

LUT Scientific and Expertise Publications

Místo vydání

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Místo konání akce

Lappeenranta

Datum konání akce

9. 9. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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