Design optimization of small-scale ORC cycles for fluctuating heat source

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00361429" target="_blank" >RIV/68407700:21220/22:00361429 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3384/ecp192029" target="_blank" >https://doi.org/10.3384/ecp192029</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3384/ecp192029" target="_blank" >10.3384/ecp192029</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Design optimization of small-scale ORC cycles for fluctuating heat source

Popis výsledku v původním jazyce

Organic Rankine cycles (ORC) are efficient technologies for waste heat recovery (WHR)at low to mid temperatures. For the design of ORC power cycles, several thermodynamic parameters should be considered. A challenge related to small scale (<50 kW) ORC cycles is to define the optimal process given frequent variability in a heat source. Many relevant applications require robust ORC systems to perform under varying heat source loads. This is an area where the body of knowledge must be further developed.In this work, the design of small-scale ORC cycles with varying heat source conditions is addressed by means of system modelling, simulation, and optimization. A framework is presented that consists of multi-scale optimization for the design of small-scale ORC systems considering seasonal and hourly heat source variations. The framework is developed as a flexible tool allowing to include fit-for-purpose models of key elements of the cycle, such as expander and heat exchanger, to suitably simulate off-design performance.The optimization framework has been tested on a case study representing a woodchips-fired micro-cogeneration unitviaORC. The case study is representative of an existing unit operating at the Czech Technical University (CTU) in Prague. The results indicate that the tooldelivers an ORC design that has a 5 % larger accumulated power production with the hourly variation of the heat source duringoneyear than the original ORC solely optimized at the design heatsourcecondition.The optimal ORC system also showsa 33 % smaller nominalcapacityand size of heat exchangersthan the ORC at the reference design, indicating a potential reduction in the capital cost.

Název v anglickém jazyce

Design optimization of small-scale ORC cycles for fluctuating heat source

Popis výsledku anglicky

Organic Rankine cycles (ORC) are efficient technologies for waste heat recovery (WHR)at low to mid temperatures. For the design of ORC power cycles, several thermodynamic parameters should be considered. A challenge related to small scale (<50 kW) ORC cycles is to define the optimal process given frequent variability in a heat source. Many relevant applications require robust ORC systems to perform under varying heat source loads. This is an area where the body of knowledge must be further developed.In this work, the design of small-scale ORC cycles with varying heat source conditions is addressed by means of system modelling, simulation, and optimization. A framework is presented that consists of multi-scale optimization for the design of small-scale ORC systems considering seasonal and hourly heat source variations. The framework is developed as a flexible tool allowing to include fit-for-purpose models of key elements of the cycle, such as expander and heat exchanger, to suitably simulate off-design performance.The optimization framework has been tested on a case study representing a woodchips-fired micro-cogeneration unitviaORC. The case study is representative of an existing unit operating at the Czech Technical University (CTU) in Prague. The results indicate that the tooldelivers an ORC design that has a 5 % larger accumulated power production with the hourly variation of the heat source duringoneyear than the original ORC solely optimized at the design heatsourcecondition.The optimal ORC system also showsa 33 % smaller nominalcapacityand size of heat exchangersthan the ORC at the reference design, indicating a potential reduction in the capital cost.

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

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 63rd International Conference of Scandinavian Simulation Society

ISBN

978-91-7929-545-5

ISSN

1650-3686

e-ISSN

1650-3740

Počet stran výsledku

6

Strana od-do

204-209

Název nakladatele

Linköping University

Místo vydání

—

Místo konání akce

Trondheim

Datum konání akce

20. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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