White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova

Compared to single-stage organic Rankine cycle (ORC) systems, cascaded ORC systems, in which a high-temperature topping cycle and low-temperature bottoming cycle are coupled together, could have advantages in terms of removing the potential for sub-atmospheric condensation conditions and improvin...

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Main Author: M. A. Fedorova
Format: Article
Language:English
Published: Omsk State Technical University, Federal State Autonomous Educational Institution of Higher Education 2020-10-01
Series:Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение"
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Online Access:https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2020/%D0%A2.%204,%20%E2%84%96%203%20(%D0%90%D0%A0%D0%B8%D0%AD%D0%9C)/90-100%20%D0%A3%D0%B0%D0%B9%D1%82%20%D0%9C.%20%D0%A2.,%20%D0%A0%D0%B8%D0%B4%20%D0%9C.%20%D0%94%D0%B6.,%20%D0%A1%D0%B0%D0%B9%D0%BC%D0%B0%20A.%20%D0%98..pdf
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author M. A. Fedorova
author_facet M. A. Fedorova
author_sort M. A. Fedorova
collection DOAJ
description Compared to single-stage organic Rankine cycle (ORC) systems, cascaded ORC systems, in which a high-temperature topping cycle and low-temperature bottoming cycle are coupled together, could have advantages in terms of removing the potential for sub-atmospheric condensation conditions and improving expander performance as the expansion process is effectively divided across two stages. Moreover, reducing the expansion volume ratio could facilitate the use of volumetric expanders, such as twin-screw expanders, which, in turn, could facilitate two-phase expansion to be utilised in one, or both, of the cycles. The aim of this paper is to compare single-stage and cascaded ORC systems, accounting for the effect of the expander volume ratio on expander performance. To investigate this, thermodynamic models for single-stage and cascaded ORC systems are developed, which include variable efficiency expander models for both radial turbines and twin-screw expanders that can estimate the effect of the expansion volume ratio on the expander isentropic efficiency. Using this model, three different scenarios are compared for different temperature heat-source temperatures, namely: (i) single-stage ORC systems with vapour-phase expansion obtained using a turboexpander; (ii) single-stage ORC systems operating with a twin-screw expander, with the possibility for two-phase expansion; and (iii) cascaded cycles with either vapour- or two-phase expansion. The results from this comparison are used to identify applications where cascaded ORC systems could offer performance benefits
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institution Kabale University
issn 2588-0373
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publishDate 2020-10-01
publisher Omsk State Technical University, Federal State Autonomous Educational Institution of Higher Education
record_format Article
series Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение"
spelling doaj-art-21f6815a66f4421e9839a8753fa0a9b52025-02-02T01:50:06ZengOmsk State Technical University, Federal State Autonomous Educational Institution of Higher EducationОмский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение"2588-03732587-764X2020-10-01439010010.25206/2588-0373-2020-4-3-90-100White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. FedorovaM. A. Fedorova0https://orcid.org/0000-0002-0899-6303Omsk State Technical UniversityCompared to single-stage organic Rankine cycle (ORC) systems, cascaded ORC systems, in which a high-temperature topping cycle and low-temperature bottoming cycle are coupled together, could have advantages in terms of removing the potential for sub-atmospheric condensation conditions and improving expander performance as the expansion process is effectively divided across two stages. Moreover, reducing the expansion volume ratio could facilitate the use of volumetric expanders, such as twin-screw expanders, which, in turn, could facilitate two-phase expansion to be utilised in one, or both, of the cycles. The aim of this paper is to compare single-stage and cascaded ORC systems, accounting for the effect of the expander volume ratio on expander performance. To investigate this, thermodynamic models for single-stage and cascaded ORC systems are developed, which include variable efficiency expander models for both radial turbines and twin-screw expanders that can estimate the effect of the expansion volume ratio on the expander isentropic efficiency. Using this model, three different scenarios are compared for different temperature heat-source temperatures, namely: (i) single-stage ORC systems with vapour-phase expansion obtained using a turboexpander; (ii) single-stage ORC systems operating with a twin-screw expander, with the possibility for two-phase expansion; and (iii) cascaded cycles with either vapour- or two-phase expansion. The results from this comparison are used to identify applications where cascaded ORC systems could offer performance benefitshttps://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2020/%D0%A2.%204,%20%E2%84%96%203%20(%D0%90%D0%A0%D0%B8%D0%AD%D0%9C)/90-100%20%D0%A3%D0%B0%D0%B9%D1%82%20%D0%9C.%20%D0%A2.,%20%D0%A0%D0%B8%D0%B4%20%D0%9C.%20%D0%94%D0%B6.,%20%D0%A1%D0%B0%D0%B9%D0%BC%D0%B0%20A.%20%D0%98..pdfsingle-stage rankine cyclecascaded rankine cycleturboexpanderscrew expanderisentropic efficiency
spellingShingle M. A. Fedorova
White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение"
single-stage rankine cycle
cascaded rankine cycle
turboexpander
screw expander
isentropic efficiency
title White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
title_full White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
title_fullStr White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
title_full_unstemmed White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
title_short White M. T., Read M. G., Sayma A. I. Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance / trans. from Engl. M. A. Fedorova
title_sort white m t read m g sayma a i comparison between single and cascaded organic rankine cycle systems accounting for the effects of expansion volume ratio on expander performance trans from engl m a fedorova
topic single-stage rankine cycle
cascaded rankine cycle
turboexpander
screw expander
isentropic efficiency
url https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2020/%D0%A2.%204,%20%E2%84%96%203%20(%D0%90%D0%A0%D0%B8%D0%AD%D0%9C)/90-100%20%D0%A3%D0%B0%D0%B9%D1%82%20%D0%9C.%20%D0%A2.,%20%D0%A0%D0%B8%D0%B4%20%D0%9C.%20%D0%94%D0%B6.,%20%D0%A1%D0%B0%D0%B9%D0%BC%D0%B0%20A.%20%D0%98..pdf
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