Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid
In this study, performance of a 50 kW organic Rankine cycle (ORC) with internal heat exchanger (IHE) having R245fa/R152a zeotropic refrigerant with various compositions was investigated. The IHE could reduce heat rate at the ORC evaporator and better cycle efficiency could be obtained. The zeotropic...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-09-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X15300101 |
| _version_ | 1831764426515021824 |
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| author | Thoranis Deethayat Tanongkiat Kiatsiriroat Chakkraphan Thawonngamyingsakul |
| author_facet | Thoranis Deethayat Tanongkiat Kiatsiriroat Chakkraphan Thawonngamyingsakul |
| author_sort | Thoranis Deethayat |
| collection | DOAJ |
| description | In this study, performance of a 50 kW organic Rankine cycle (ORC) with internal heat exchanger (IHE) having R245fa/R152a zeotropic refrigerant with various compositions was investigated. The IHE could reduce heat rate at the ORC evaporator and better cycle efficiency could be obtained. The zeotropic mixture could reduce the irreversibilities during the heat exchanges at the ORC evaporator and the ORC condenser due to its gliding temperature; thus the cycle working temperatures came closer to the temperatures of the heat source and the heat sink. In this paper, effects of evaporating temperature, mass fraction of R152a and effectiveness of internal heat exchanger on the ORC performances for the first law and the second law of thermodynamics were considered. The simulated results showed that reduction of R245fa composition could reduce the irreversibilities at the evaporator and the condenser. The suitable composition of R245fa was around 80% mass fraction and below this the irreversibilities were nearly steady. Higher evaporating temperature and higher internal heat exchanger effectiveness also increased the first law and second law efficiencies. A set of correlations to estimate the first and the second law efficiencies with the mass fraction of R245fa, the internal heat exchanger effectiveness and the evaporating temperature were also developed. |
| first_indexed | 2024-12-22T05:43:47Z |
| format | Article |
| id | doaj.art-53c9178fb33044fa8f62885baae5cbb3 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-22T05:43:47Z |
| publishDate | 2015-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-53c9178fb33044fa8f62885baae5cbb32022-12-21T18:37:06ZengElsevierCase Studies in Thermal Engineering2214-157X2015-09-016C15516110.1016/j.csite.2015.09.003Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluidThoranis Deethayat0Tanongkiat Kiatsiriroat1Chakkraphan Thawonngamyingsakul2Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, ThailandDepartment of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, ThailandDepartment of Mechanical Engineering, Faculty of Engineering, Rajamangala University of Technology Lanna Tak, Tak 63000, ThailandIn this study, performance of a 50 kW organic Rankine cycle (ORC) with internal heat exchanger (IHE) having R245fa/R152a zeotropic refrigerant with various compositions was investigated. The IHE could reduce heat rate at the ORC evaporator and better cycle efficiency could be obtained. The zeotropic mixture could reduce the irreversibilities during the heat exchanges at the ORC evaporator and the ORC condenser due to its gliding temperature; thus the cycle working temperatures came closer to the temperatures of the heat source and the heat sink. In this paper, effects of evaporating temperature, mass fraction of R152a and effectiveness of internal heat exchanger on the ORC performances for the first law and the second law of thermodynamics were considered. The simulated results showed that reduction of R245fa composition could reduce the irreversibilities at the evaporator and the condenser. The suitable composition of R245fa was around 80% mass fraction and below this the irreversibilities were nearly steady. Higher evaporating temperature and higher internal heat exchanger effectiveness also increased the first law and second law efficiencies. A set of correlations to estimate the first and the second law efficiencies with the mass fraction of R245fa, the internal heat exchanger effectiveness and the evaporating temperature were also developed.http://www.sciencedirect.com/science/article/pii/S2214157X15300101Organic Rankine cycleInternal heat exchangerThermal performanceZeotropic refrigerant |
| spellingShingle | Thoranis Deethayat Tanongkiat Kiatsiriroat Chakkraphan Thawonngamyingsakul Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid Case Studies in Thermal Engineering Organic Rankine cycle Internal heat exchanger Thermal performance Zeotropic refrigerant |
| title | Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid |
| title_full | Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid |
| title_fullStr | Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid |
| title_full_unstemmed | Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid |
| title_short | Performance analysis of an organic Rankine cycle with internal heat exchanger having zeotropic working fluid |
| title_sort | performance analysis of an organic rankine cycle with internal heat exchanger having zeotropic working fluid |
| topic | Organic Rankine cycle Internal heat exchanger Thermal performance Zeotropic refrigerant |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X15300101 |
| work_keys_str_mv | AT thoranisdeethayat performanceanalysisofanorganicrankinecyclewithinternalheatexchangerhavingzeotropicworkingfluid AT tanongkiatkiatsiriroat performanceanalysisofanorganicrankinecyclewithinternalheatexchangerhavingzeotropicworkingfluid AT chakkraphanthawonngamyingsakul performanceanalysisofanorganicrankinecyclewithinternalheatexchangerhavingzeotropicworkingfluid |