Impact of Major Leakages on Characteristics of a Rotary Vane Expander for ORC

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F17%3A00316365" target="_blank" >RIV/68407700:21220/17:00316365 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21720/17:00316365

Výsledek na webu

<a href="https://doi.org/10.1016/j.egypro.2017.09.249" target="_blank" >https://doi.org/10.1016/j.egypro.2017.09.249</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.egypro.2017.09.249" target="_blank" >10.1016/j.egypro.2017.09.249</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Impact of Major Leakages on Characteristics of a Rotary Vane Expander for ORC

Popis výsledku v původním jazyce

Volumetric expanders are used for low to medium power output ORC applications. For low power output ORCs (< 10 kW), rotary vane expanders represent a suitable choice. Their isentropic efficiency is often reported as the most important or even the only metrics for comparison. Such approach however neglects the effect of leakages within the expander on the rest of the cycle, especially on the evaporator pressure. Filling factor of rotary vane expanders may be affected, among other leakages, by delayed closure of working chamber. This work describes a semi-empirical model with two different leakages – lumped leakage area between inlet and outlet and leakage between working chambers due to delayed contact of vane and stator. Primary purpose of the model is to demonstrate the effect of the delayed chamber closure. This is identified as a necessary parameter for modeling of the rotary vane expanders, compared to only single lumped leakage area for the other expander types. Results of the model for several case scenarios are presented, showing an impact of these leakages on an overall cycle performance, isentropic efficiency and filling factor. It is demonstrated that isentropic efficiency of the rotary vane expander might not be always sufficient to compare vane expanders or their modifications even within a same ORC. Lastly the model conclusions are preliminarily checked with our experimental data.

Název v anglickém jazyce

Impact of Major Leakages on Characteristics of a Rotary Vane Expander for ORC

Popis výsledku anglicky

Volumetric expanders are used for low to medium power output ORC applications. For low power output ORCs (< 10 kW), rotary vane expanders represent a suitable choice. Their isentropic efficiency is often reported as the most important or even the only metrics for comparison. Such approach however neglects the effect of leakages within the expander on the rest of the cycle, especially on the evaporator pressure. Filling factor of rotary vane expanders may be affected, among other leakages, by delayed closure of working chamber. This work describes a semi-empirical model with two different leakages – lumped leakage area between inlet and outlet and leakage between working chambers due to delayed contact of vane and stator. Primary purpose of the model is to demonstrate the effect of the delayed chamber closure. This is identified as a necessary parameter for modeling of the rotary vane expanders, compared to only single lumped leakage area for the other expander types. Results of the model for several case scenarios are presented, showing an impact of these leakages on an overall cycle performance, isentropic efficiency and filling factor. It is demonstrated that isentropic efficiency of the rotary vane expander might not be always sufficient to compare vane expanders or their modifications even within a same ORC. Lastly the model conclusions are preliminarily checked with our experimental data.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/LO1605" target="_blank" >LO1605: Univerzitní centrum energeticky efektivních budov – Fáze udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

Energy Procedia - 4th International Seminar on ORC Power Systems

ISBN

—

ISSN

1876-6102

e-ISSN

—

Počet stran výsledku

8

Strana od-do

387-394

Název nakladatele

Elsevier Ltd

Místo vydání

Oxford

Místo konání akce

Milano

Datum konání akce

13. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000411758800050