TY - JOUR
T1 - Étude expérimentale des stratégies et méthodes de régulation pour le fonctionnement hors conception du cycle à éjecteur diphasique transcritique au R744
AU - Lawrence, Neal
AU - Elbel, Stefan
N1 - Funding Information:
The research presented in this paper was part of the Ph.D. work of Neal Lawrence, which was funded through the Air Conditioning and Refrigeration Center (ACRC) at the University of Illinois at Urbana-Champaign . The authors would like to thank the member companies of the ACRC for their support.
Publisher Copyright:
© 2019 Elsevier Ltd and IIR
PY - 2019/10
Y1 - 2019/10
N2 - Numerous recent studies have demonstrated the significant opportunity to enhance vapor-compression cycle COP by integration of a two-phase ejector, especially for transcritical CO2 cycles. However, this significant improvement in performance relies on proper control of the ejector cycle. This paper investigates different methods for controlling the high-side pressure of a transcritical CO2 ejector cycle. The use of an ejector with an adjustable motive nozzle throat area as well as a simple expansion valve in series or parallel with a fixed-geometry ejector to actively control high-side pressure are investigated over a range of conditions. Additionally, proper control of evaporator flow rate, which is often overlooked in studies addressing ejector cycle control, for different conditions is also investigated. Ejector cycle control is investigated over a range of capacities and ambient temperatures in order to see the performance penalties to a transcritical CO2 ejector cycle when it is not controlled properly.
AB - Numerous recent studies have demonstrated the significant opportunity to enhance vapor-compression cycle COP by integration of a two-phase ejector, especially for transcritical CO2 cycles. However, this significant improvement in performance relies on proper control of the ejector cycle. This paper investigates different methods for controlling the high-side pressure of a transcritical CO2 ejector cycle. The use of an ejector with an adjustable motive nozzle throat area as well as a simple expansion valve in series or parallel with a fixed-geometry ejector to actively control high-side pressure are investigated over a range of conditions. Additionally, proper control of evaporator flow rate, which is often overlooked in studies addressing ejector cycle control, for different conditions is also investigated. Ejector cycle control is investigated over a range of capacities and ambient temperatures in order to see the performance penalties to a transcritical CO2 ejector cycle when it is not controlled properly.
KW - Adjustable ejector
KW - Cycle optimization
KW - Ejector
KW - Evaporator performance
KW - Expansion work recovery
UR - http://www.scopus.com/inward/record.url?scp=85068533056&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068533056&partnerID=8YFLogxK
U2 - 10.1016/j.ijrefrig.2019.04.020
DO - 10.1016/j.ijrefrig.2019.04.020
M3 - Article
AN - SCOPUS:85068533056
SN - 0140-7007
VL - 106
SP - 570
EP - 582
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
ER -