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Energies 2021, 14, 8238 24 of 25 References gc hx i is e MN nom r SL SN VEJ1 w Superscript gc HP IN LP OUT Greek α φ φ φp ηvol ηcomp ρ ρ Gas-cooler Heat exchanger Internal Isentropic External Motive nozzle Nominal condition Refrigerant Saturated liquid Suction nozzle Vapour ejector 1 tested in Banasiak et al. 2015 Wall Gas-cooler High pressure side Inlet Low pressure side Outlet Heat transfer coefficient [Wm−2K−1] Air relative humidity [%] Ejector entrainment ratio [-] Brazed plate heat exchanger’s surface enlargement ratio [-] Volumetric efficiency [-] Overall compression efficiency [-] Density [kgm−3] Mean density [kgm−3] 1. European Commision. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions- A Renovation Wave for Europe-Greening Our Buildings, Creating Jobs, Improving Lives, COM(2020) 662 Final; European Commision: Brussels, Belgium, 2020. 2. Kavvadias, K.; Jiménez-Navarro, J.P.; Thomassen, G. Decarbonising the EU Heating Sector-Integration of the Power and Heating Sector; JRC114758 JRC Technical Report; JRC Publications Repository: Brussels, Belgium, 2019. 3. Heinz, A.; Martin, K.; Rieberer, R.; Kotenko, O. Experimental analysis and simulation of an integrated CO2 heat pump for low-heating-energy buildings. In Proceedings of the 9th IIR Gustav Lorentzen Conference, Sydney, Australia, 12–14 April 2010. 4. Lorentzen, G. Revival of Carbon Dioxide as a Refrigerant. Int. J. Refrig. 1994, 17, 292–301. [CrossRef] 5. Nekså, P.; Rekstad, H.; Zakeri, G.R.; Schiefloe, P.A. CO2-heat pump water heater: Characteristics, system design and experimental results. Int. J. Refrig. 1998, 21, 172–179. [CrossRef] 6. Minetto, S. Theoretical and experimental analysis of a CO2 heat pump for domestic hot water. Int. J. Refrig. 2011, 34, 742–751. [CrossRef] 7. Lorentzen, G. Throttling, the Internal Haemorrhage of the Refrigeration Process; Institute of Refrigeration at the Institute of Marine Engineers: London, UK, 1984. 8. Li, D.; Groll, E.A. Transcritical CO2 refrigeration cycle with ejector-expansion device. Int. J. Refrig. 2005, 28, 766–773. [CrossRef] 9. Elbel, S.; Hrnjak, P. Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation. Int. J. Refrig. 2008, 31, 411–422. [CrossRef] 10. Minetto, S.; Brignoli, R.; Banasiak, K.; Hafner, A.; Zilio, C. Performance assessment of an off-the-shelf R744 heat pump equipped with an ejector. Appl. Therm. Eng. 2013, 59, 568–575. [CrossRef] 11. Gullo, P.; Hafner, A.; Banasiak, K.; Minetto, S.; Kriezi, E. Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments. Energies 2019, 12, 406. [CrossRef] 12. Sarkar, J.; Bhattacharyya, S.; Gopal, M.R. Simulation of a transcritical CO2 heat pump cycle for simultaneous cooling and heating applications. Int. J. Refrig. 2006, 29, 735–743. [CrossRef] 13. Minetto, S.; Cecchinato, L.; Brignoli, R.; Marinetti, S.; Rossetti, A. Water-side reversible CO2 heat pump for residential application. Int. J. Refrig. 2016, 63, 237–250. [CrossRef] 14. Styles, D.; Schönberger, H.; Galvez Martos, J.L. Best Environmental Management Practice in the Tourism Sector; EUR 26022 EN; European Union: Brussels, Belgium, 2017. [CrossRef]PDF Image | Dynamic Modelling and Validation of an Air-to-Water Reversible R744
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