Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units
Banasiak, Krzysztof; Hafner, Armin; Kriezi, Ekaterini E.; Madsen, Kenneth B.; Birkelund, Michael; Fredslund, Kristian; Olsson, Rickard
Peer reviewed, Journal article
Accepted version
Permanent lenke
https://hdl.handle.net/11250/2653075Utgivelsesdato
2015Metadata
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- Publikasjoner fra CRIStin - SINTEF Energi [1596]
- SINTEF Energi [1710]
Originalversjon
International journal of refrigeration. 2015, 57 265-276. 10.1016/j.ijrefrig.2015.05.016Sammendrag
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 °C gas cooler outlet temperature and a -3 °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.