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Numerical and experimental investigation of the influence of generating pressure on the performance of a one-phase ejector installed within an R245fa refrigeration cycle
•The experiments were used to study the ejector refrigeration system.•The generating pressure impact on the system performance was investigated.•Moving average filtering method removed the periodic disturbance from the signals.•The model of ejector was developed and validated with filtered experimen...
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Published in: | Applied thermal engineering 2019-07, Vol.157, p.113654, Article 113654 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •The experiments were used to study the ejector refrigeration system.•The generating pressure impact on the system performance was investigated.•Moving average filtering method removed the periodic disturbance from the signals.•The model of ejector was developed and validated with filtered experimental data.•The existence of optimum generating pressure was shown and justified.
The highest compression ratio (Cr) of an ejector refrigeration system could guarantee the high efficiency for such systems. The present paper studied the impact of generating pressure on Cr for the ejector installed in an ERS. Signal processing techniques were applied to analyse the acquired signals of an R245fa ejector refrigeration system and revealed the existence of periodic noise in the experimental data. The Moving average filtering method eliminated the periodic noise from the signals and improved the experimental precision. Then, the influence of the generating pressure on the ejector’s performance was studied using the filtered experimental data, for different condenser temperatures ranging from 20 to 24 °C. It was observed that there is an optimum value of the generating pressure that simultaneously maximizes the ejector Cr and minimizes the suction pressure. The developed 1-D thermodynamic model of the ejector showed that the ejector operates in the subcritical mode when the generating pressure is below the Cr optimum point, while operates in critical mode at or above this optimum generating pressure. |
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ISSN: | 1359-4311 1873-5606 |
DOI: | 10.1016/j.applthermaleng.2019.04.064 |