Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved]
This work investigates a vapour injection scroll compressor integrated in a heat pump using the refrigerant R1234ze(E). The water-to-water heat pump was tested under a wide temperature range at the evaporator and condenser sides. The test results revealed that the performance is significantly reduce...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
F1000 Research Ltd
2022-11-01
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| Series: | Open Research Europe |
| Subjects: | |
| Online Access: | https://open-research-europe.ec.europa.eu/articles/2-49/v2 |
| _version_ | 1811300619675238400 |
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| author | George Meramveliotakis Sotirios Karellas George Kosmadakis |
| author_facet | George Meramveliotakis Sotirios Karellas George Kosmadakis |
| author_sort | George Meramveliotakis |
| collection | DOAJ |
| description | This work investigates a vapour injection scroll compressor integrated in a heat pump using the refrigerant R1234ze(E). The water-to-water heat pump was tested under a wide temperature range at the evaporator and condenser sides. The test results revealed that the performance is significantly reduced for lifts of over 30 K with the coefficient of performance being even below 2 and the maximum 2nd law efficiency was just 28%. In order to enlighten the reasons behind such significant compressor underperformance, a semi-empirical model has been extended to include vapour injection, and a new improved modelling approach for the suction pressure drop was developed and implemented considering both the turbulent and laminar inlet flow regimes. Once the accuracy of the developed semi-empirical model was verified, the model was then adjusted to account for the R1234ze(E) operation, by fine-tuning its parameters based on the test data. The main loss mechanism identified is the high suction pressure drop, due to the high friction factor, with the inlet refrigerant flow possibly being laminar instead of turbulent. This resulted in a significant reduction of the mass flow rate and volumetric efficiency, while the standard model for suction pressure drop was not able to capture this effect. |
| first_indexed | 2024-04-13T06:54:59Z |
| format | Article |
| id | doaj.art-702bc57f247d443e9af48736af4ebce0 |
| institution | Directory Open Access Journal |
| issn | 2732-5121 |
| language | English |
| last_indexed | 2024-04-13T06:54:59Z |
| publishDate | 2022-11-01 |
| publisher | F1000 Research Ltd |
| record_format | Article |
| series | Open Research Europe |
| spelling | doaj.art-702bc57f247d443e9af48736af4ebce02022-12-22T02:57:17ZengF1000 Research LtdOpen Research Europe2732-51212022-11-01216569Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved]George Meramveliotakis0Sotirios Karellas1George Kosmadakis2https://orcid.org/0000-0002-3671-8693Thermal Hydraulics and Multiphase Flow Laboratory, National Center for Scientific Research Demokritos, Agia Paraskevi, 15341, GreeceLaboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, Athens, 15780, GreeceThermal Hydraulics and Multiphase Flow Laboratory, National Center for Scientific Research Demokritos, Agia Paraskevi, 15341, GreeceThis work investigates a vapour injection scroll compressor integrated in a heat pump using the refrigerant R1234ze(E). The water-to-water heat pump was tested under a wide temperature range at the evaporator and condenser sides. The test results revealed that the performance is significantly reduced for lifts of over 30 K with the coefficient of performance being even below 2 and the maximum 2nd law efficiency was just 28%. In order to enlighten the reasons behind such significant compressor underperformance, a semi-empirical model has been extended to include vapour injection, and a new improved modelling approach for the suction pressure drop was developed and implemented considering both the turbulent and laminar inlet flow regimes. Once the accuracy of the developed semi-empirical model was verified, the model was then adjusted to account for the R1234ze(E) operation, by fine-tuning its parameters based on the test data. The main loss mechanism identified is the high suction pressure drop, due to the high friction factor, with the inlet refrigerant flow possibly being laminar instead of turbulent. This resulted in a significant reduction of the mass flow rate and volumetric efficiency, while the standard model for suction pressure drop was not able to capture this effect.https://open-research-europe.ec.europa.eu/articles/2-49/v2scroll compressor HFO refrigerant R1234ze(E) semi-empirical model suction pressure drop vapour injectioneng |
| spellingShingle | George Meramveliotakis Sotirios Karellas George Kosmadakis Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] Open Research Europe scroll compressor HFO refrigerant R1234ze(E) semi-empirical model suction pressure drop vapour injection eng |
| title | Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] |
| title_full | Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] |
| title_fullStr | Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] |
| title_full_unstemmed | Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] |
| title_short | Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E) [version 2; peer review: 2 approved] |
| title_sort | identifying the performance and losses of a scroll compressor with vapour injection and r1234ze e version 2 peer review 2 approved |
| topic | scroll compressor HFO refrigerant R1234ze(E) semi-empirical model suction pressure drop vapour injection eng |
| url | https://open-research-europe.ec.europa.eu/articles/2-49/v2 |
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