Performance analysis of the ejector-expansion refrigeration cycle using zeotropic mixtures
2015 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 57, 197-207 p., 3043Article in journal (Refereed) Published
Abstract To evaluate the performance of the ejector-expansion refrigeration cycle (EERC) using zeotropic mixtures, a numerical study is conducted. A constant-pressure two-phase ejector model for zeotropic mixtures is established. The effects of both the fluid composition and the working conditions are investigated. Mixture R134a/R143a is selected as the working and the simulation results reveal that, the cycle COP increases first and then decreases as MF<inf>t</inf> (the mass fraction of R134a) increases in the researched condition. The COP gets a maximum value of 4.18 with MF<inf>t</inf> of 0.9 and yields a minimum value of 3.66 with MF<inf>t</inf> of 0.5. With mixture 0.9/0.1, the COP improvement reaches a maximum value of 10.47%. This improvement rises at high condensing temperature or low evaporating temperature. The exergy analysis shows that the compressor and ejector contribute the most exergy destruction, and the cycle exergy efficiency achieves a maximum value with MF<inf>t</inf> of 0.7.
Place, publisher, year, edition, pages
2015. Vol. 57, 197-207 p., 3043
Ejector-expansion refrigeration cycle, Two-phase, Zeotropic mixtures, Ejectors (pumps), Exergy, Expansion, Mixtures, Condensing temperature, Evaporating temperature, Exergy destructions, Exergy efficiencies, Expansion refrigeration, Performance analysis, Two phase, Zeotropic mixture, Refrigeration
IdentifiersURN: urn:nbn:se:kth:diva-175024DOI: 10.1016/j.ijrefrig.2015.05.006ISI: 000361908200019ScopusID: 2-s2.0-84937435789OAI: oai:DiVA.org:kth-175024DiVA: diva2:875196
QC 201511302015-11-302015-10-092015-11-30Bibliographically approved