Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 57, Issue -, Pages 265-276Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2015.05.016
Keywords
Multi-ejector; Expansion work recovery; R744; Discharge pressure control
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A multi-ejector expansion pack, intended as a substitute for a standard high-pressure electronic expansion valve (HPV), was designed, manufactured and experimentally investigated. Four different ejector cartridges were sized to enable a discrete opening characteristic with a binary profile for a parallel-compression R744 system. The system is rated for 70 kW at a 35 degrees C gas cooler outlet temperature and a -3 degrees C evaporation temperature. High values of ejector efficiency, exceeding 0.3 over a broad operation range, were recorded for all four of the cartridges tested under vapour compression conditions. The applicability of the multi-ejector pack as a main flashing device was verified experimentally. Similar profiles of the discharge pressure control error were recorded for both alternative options: expansion purely in the HPV vs. HPV-assisted expansion in the multi-ejector pack. (C) 2015 Elsevier Ltd and IIR. All rights reserved.
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