TAN Yingying, WANG Lin, BAI Depo, et al. Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation[J]. CIESC Journal, 2016, (S2): 107-112.
TAN Yingying, WANG Lin, BAI Depo, et al. Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation[J]. CIESC Journal, 2016, (S2): 107-112.DOI: 10.11949/j.issn.0438-1157.20161422.
Theoretical analyses on auto-cascade ejector refrigeration cycle with one-step dephlegmation and two-step dephlegmation were performed to discuss the influence of mixed refrigerant composition
condensing temperature and refrigeration temperature on the cycle performance using zeotropic mixture refrigerant R23/R134a.The results show that when the mass fraction of the low boiling point component in the mixed refrigerant increases
the ejector pressure ratios decrease and the cycle COP increases
when condensing temperature increases
the ejector pressure ratios increase and COP decreases significantly
and when evaporating temperature increases
the ejector pressure ratios decrease
and the cycle COP increases.Under the same working conditions
COP of two-step dephlegmation cycle is greater than that of one-step dephlegmation cycle.Two-step dephlegmation cycle can obtain lower refrigeration temperature at -15℃ under the pressure ratio of ejector is about 1.8.