Experimental study of a two-phase ejector for CO2 transcritical refrigeration system

• Autorzy: Haberschill Philippe , Nehdi Ezzeddine , Kairouani Lakdar , Elakhdar Mouna Abouda

Identyfikatory

DOI

10.24425/ather.2021.139660

• Języki publikacji: EN

Abstrakty

EN

The geometry and operating parameters have an important influence on the performance of ejectors. The improvement of the refrigeration cycle performance and the design of the ejectors for the compression energy recovery requires a detailed analysis of the internal ejector working characteristics and geometry. To this aim, an experimental investigation of an ejector refrigeration system is conducted to determine the effect of the most important ejector dimensions on ejector working characteristics and system performance. Different dimensions of ejector components are tested. The influence of the ejector’s geometrical parameters on the system performance was analysed. The experiments with respect to the variation of ejector geometry such as the motive nozzle throat diameter, the mixing chamber diameter and the distance between the motive nozzle and diffuser were carried out. There exist optimum design parameters in each test. The experimental results show that the performance (entrainment ratio and a compression ratio of the ejector) increases significantly with the position between the primary nozzle and the mixing chamber. A maximum entrainment ratio of 57.3% and a compression ratio of 1.26 were recorded for the different parameters studied. The results obtained are consistent with experimental results found in the literature.

Słowa kluczowe

EN

CO2; ejector; transcritical cycle

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2021
• Tom: Vol. 42, no 4
• Strony: 217--246
• Opis fizyczny: Bibliogr. 41 poz., rys.

Twórcy

autor

Haberschill Philippe

• University of Lyon, CNRS, INSA-Lyon, CETHIL UMR5008, F-69621, Villeurbanne, France

autor

Nehdi Ezzeddine

• Research Lab Energetic and Environment, National Engineering School of Tunis, Tunis El Manar University, Tunisia

autor

Kairouani Lakdar

• Research Lab Energetic and Environment, National Engineering School of Tunis, Tunis El Manar University, Tunisia

autor

Elakhdar Mouna Abouda

• Research Lab Energetic and Environment, National Engineering School of Tunis, Tunis El Manar University, Tunisia

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Uwagi

This work has been supported by the Centre for Energy and Thermal Sciences of the INSA of Lyon. All the gratitude and the recognition to the Centre for Energy and Thermal Sciences of the INSA of Lyon, who made available all the equipment necessary to carry out this experimental work.