Thermodynamic Analysis of a Multi-Ejector, CO

G. Boccardi, F. Botticella, G. Lillo, R. Mastrullo, A.W. Mauro, R. Trinchieri

Research output: Contribution to conferencePaper

10 Citations (Scopus)


Nowadays, air conditioning systems for residential and office buildings, contribute largely to the energy consumptions and to the direct and indirect emissions of greenhouse gases. Carbon dioxide (CO2) could be an interesting option to replace traditional HFCs in space heating applications, due to its environmentally friendly characteristics: zero ODP and extremely low GWP, but, in order to spread its use, improvements in performances are needed. In fact, CO2 requires transcritical cycles with high expansion losses. The use of an ejector can reduce these losses and improve the performances up to 30% (depending on the performances of the ejector itself and on the operating conditions). In the a/c applications, characterized by variable operating conditions, multi-ejector systems could be used, where some ejectors work in parallel, in different combination, varying the operating conditions. Currently, a project of DTE-PCU-SPCT Department of ENEA and Industrial Engineering Department of Federico II University of Naples, is in progress, in order to evaluate experimentally the effect of several ejectors geometries on the global performance of a CO2 heat pump working with a transcritical cycle. As a part of this project, a complete heat pump system for production of hot water for sanitary use and for space heating is tested to investigate the effect of the ejector size on the balancing of the global performance of the whole system.
Original languageEnglish
Publication statusPublished - 1 Nov 2016
Event71st Conference of the Italian Thermal Machines Engineering Association, ATI 2016 - Torino, Italy
Duration: 1 Nov 2016 → …


Conference71st Conference of the Italian Thermal Machines Engineering Association, ATI 2016
Period1/11/16 → …


All Science Journal Classification (ASJC) codes

  • Energy(all)

Cite this

Boccardi, G., Botticella, F., Lillo, G., Mastrullo, R., Mauro, A. W., & Trinchieri, R. (2016). Thermodynamic Analysis of a Multi-Ejector, CO. Paper presented at 71st Conference of the Italian Thermal Machines Engineering Association, ATI 2016, Torino, Italy.