FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3003661007> ?p ?o ?g. }

• W3003661007 abstract "This Ph.D. thesis presents a study of scroll compressors with vapor-injection (SCVI) for heat pumps operating in cold climates or in high-temperature water heating applications. To do so, firstly, an SCVI was experimentally compared with a two-stage reciprocating compressor (TSRC) working with R-407C under extreme conditions. The comparison was made in terms of compressor efficiencies, capacity, COP, and seasonal COP, both for heating and cooling modes. The results give a general idea about the application range of the studied compressors and the differences in the compressors' performance. Nevertheless, several restrictions in the compressors' characterization and the cycle analysis were identified. This motivated us to deepen in the study of the two-stage compression cycle and its components. The next step was performing a theoretical analysis of two-stage compression cycles for heating applications, where the intermediate pressure and the injection ratio were identified as the most influential system parameters on the COP. The intermediate pressure was optimized for two vapor-injection configurations (flash tank and economizer) using several refrigerants. Based on the optimization results, a correlation was proposed that allows obtaining the optimal intermediate pressure of the cycle, considering the influence of the subcooling at the condenser outlet. In addition, a theoretical analysis of the influence of the design of the system components on the COP of the cycle was performed. Once the thermodynamic analysis of the two-stage cycle was carried out, the study was deepened at the component level. The most critical factor in the system is the compressor performance. Hence, the next step was evaluating the influence of several compression systems with vapor-injection on the COP. Three compressor technologies were taken into account, an SCVI, a TSRC and a two-stage scroll compressor (TSSC). These compressor technologies were characterized and modeled in order to study their performance. To do so, a new methodology to characterize SCVI was proposed. This methodology allows evaluating the compressor performance independently of the injection mechanism used in the cycle. A linear correlation was identified between the refrigerant injection ratio and the intermediate compression ratio. This correlation is used to determine the injection mass flow as a function of the intermediate pressure. Then, a semi-empirical model of scroll compressors and a methodology to extend the model for scroll compressors with vapor-injection was proposed. The models were adjusted and validated using experimental data from four scroll compressors working with R-290 and an SCVI compressor working with R-407C. Finally, an SCVI was compared with two two-stage compressors, a TSSC, and a TSRC, working in extreme conditions. The displacement ratio of the two-stage compressors was optimized. Results show that, at the nominal operating conditions (Te=-15 °C, Tc=50 °C), the optimal displacement ratio of the TSSC is 0.58, and of the TSRC is 0.57. The TSSC achieves 6% larger COP than the SCVI and 11.7% larger COP than the TSRC. Under a wide range of operating conditions, the SCVI presents a better efficiency and COP for pressure ratios below 5. For higher-pressure ratios, the TSSC presents better performance and achieves lower discharge temperature. It is concluded that the SCVI is an easy solution to implement from the point of view of machining, which allows extending the working map of the single-stage compressors. However, the results show that the two-stage compression technology gets further improve the COP of the cycle and the capacity, with a greater reduction of the discharge temperature operating under extreme conditions." @default.
• W3003661007 created "2020-02-07" @default.
• W3003661007 creator A5012057818 @default.
• W3003661007 creator A5082560180 @default.
• W3003661007 date "2019-05-14" @default.
• W3003661007 modified "2023-10-16" @default.
• W3003661007 title "Study of scroll compressors with vapor-injection for heat pumps operating in cold climates or in high-temperature water heating applications" @default.
• W3003661007 doi "https://doi.org/10.4995/thesis/10251/120473" @default.
• W3003661007 hasPublicationYear "2019" @default.
• W3003661007 type Work @default.
• W3003661007 sameAs 3003661007 @default.
• W3003661007 citedByCount "0" @default.
• W3003661007 crossrefType "dissertation" @default.
• W3003661007 hasAuthorship W3003661007A5012057818 @default.
• W3003661007 hasAuthorship W3003661007A5082560180 @default.
• W3003661007 hasBestOaLocation W30036610071 @default.
• W3003661007 hasConcept C107706546 @default.
• W3003661007 hasConcept C115139850 @default.
• W3003661007 hasConcept C116915560 @default.
• W3003661007 hasConcept C120665830 @default.
• W3003661007 hasConcept C121332964 @default.
• W3003661007 hasConcept C127413603 @default.
• W3003661007 hasConcept C131097465 @default.
• W3003661007 hasConcept C13119800 @default.
• W3003661007 hasConcept C137076967 @default.
• W3003661007 hasConcept C164915370 @default.
• W3003661007 hasConcept C199499590 @default.
• W3003661007 hasConcept C2776461528 @default.
• W3003661007 hasConcept C2777825279 @default.
• W3003661007 hasConcept C2780934509 @default.
• W3003661007 hasConcept C2982854487 @default.
• W3003661007 hasConcept C36570524 @default.
• W3003661007 hasConcept C41004858 @default.
• W3003661007 hasConcept C50517652 @default.
• W3003661007 hasConcept C5395353 @default.
• W3003661007 hasConcept C78519656 @default.
• W3003661007 hasConcept C96261405 @default.
• W3003661007 hasConcept C97355855 @default.
• W3003661007 hasConceptScore W3003661007C107706546 @default.
• W3003661007 hasConceptScore W3003661007C115139850 @default.
• W3003661007 hasConceptScore W3003661007C116915560 @default.
• W3003661007 hasConceptScore W3003661007C120665830 @default.
• W3003661007 hasConceptScore W3003661007C121332964 @default.
• W3003661007 hasConceptScore W3003661007C127413603 @default.
• W3003661007 hasConceptScore W3003661007C131097465 @default.
• W3003661007 hasConceptScore W3003661007C13119800 @default.
• W3003661007 hasConceptScore W3003661007C137076967 @default.
• W3003661007 hasConceptScore W3003661007C164915370 @default.
• W3003661007 hasConceptScore W3003661007C199499590 @default.
• W3003661007 hasConceptScore W3003661007C2776461528 @default.
• W3003661007 hasConceptScore W3003661007C2777825279 @default.
• W3003661007 hasConceptScore W3003661007C2780934509 @default.
• W3003661007 hasConceptScore W3003661007C2982854487 @default.
• W3003661007 hasConceptScore W3003661007C36570524 @default.
• W3003661007 hasConceptScore W3003661007C41004858 @default.
• W3003661007 hasConceptScore W3003661007C50517652 @default.
• W3003661007 hasConceptScore W3003661007C5395353 @default.
• W3003661007 hasConceptScore W3003661007C78519656 @default.
• W3003661007 hasConceptScore W3003661007C96261405 @default.
• W3003661007 hasConceptScore W3003661007C97355855 @default.
• W3003661007 hasLocation W30036610071 @default.
• W3003661007 hasOpenAccess W3003661007 @default.
• W3003661007 hasPrimaryLocation W30036610071 @default.
• W3003661007 hasRelatedWork W1492640469 @default.
• W3003661007 hasRelatedWork W1553180155 @default.
• W3003661007 hasRelatedWork W1553243411 @default.
• W3003661007 hasRelatedWork W1578639066 @default.
• W3003661007 hasRelatedWork W1985581295 @default.
• W3003661007 hasRelatedWork W2093178033 @default.
• W3003661007 hasRelatedWork W2144427542 @default.
• W3003661007 hasRelatedWork W2232686259 @default.
• W3003661007 hasRelatedWork W2569337208 @default.
• W3003661007 hasRelatedWork W2596297960 @default.
• W3003661007 hasRelatedWork W2751433008 @default.
• W3003661007 hasRelatedWork W2790482285 @default.
• W3003661007 hasRelatedWork W2903513061 @default.
• W3003661007 hasRelatedWork W2936306600 @default.
• W3003661007 hasRelatedWork W2954942793 @default.
• W3003661007 hasRelatedWork W2971516924 @default.
• W3003661007 hasRelatedWork W3040505393 @default.
• W3003661007 hasRelatedWork W3176692032 @default.
• W3003661007 hasRelatedWork W3214701481 @default.
• W3003661007 hasRelatedWork W34037636 @default.
• W3003661007 isParatext "false" @default.
• W3003661007 isRetracted "false" @default.
• W3003661007 magId "3003661007" @default.
• W3003661007 workType "dissertation" @default.