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Energies 2021, 14, 8238 23 of 25 Author Contributions: Conceptualization, A.R. and S.M. (Silvia Minetto); Data curation, G.T.; Formal analysis, P.A. and A.R.; Funding acquisition, S.M. (Sergio Marinetti) and S.M. (Silvia Minetto); Methodology, A.R. and S.M. (Silvia Minetto); Software, P.A.; Writing—original draft, P.A.; Writing— review & editing, S.M. (Sergio Marinetti), A.H. and K.B. All authors have read and agreed to the published version of the manuscript. Funding: The MultiPACK Project has received funding from the European Union’s Horizon 2020 research and innovation programme, under grant agreement No. 723137. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: Data available in a publicly accessible repository (https://dataverse. no/, (accessed on 10 October 2021)—Distributor name: NTNU Open Research Data). Acknowledgments: The experimental activity presented in this manuscript was carried out within the project MultiPACK. Conflicts of Interest: The authors declare no conflict of interest. Nomenclature AHX Heat exchange area [m2] Ac,tot Brazed-plate heat exchanger’s total cross sectional area [m2] Aop Expansion valve actual cross flow area [m2] Aop,MAX Expansion valve maximum cross flow area [m2] bp Brazed-plate heat exchanger’s distance between plates [m] BV Ball valve BPV Back pressure valve Cq Expansion valve flow coefficient [-] Di Internal diameter [m] Dh Hydraulic diameter [m] DHW Domestic hot water EEV Electronic expansion valve h Specific enthalpy [kJ kg−1 ] h Mean specific enthalpy [kJ kg−1 ] HLV Height of liquid-vapour interface [m] Inv Inverter IHX Internal heat exchanger Lpipe Equivalent pipe length [m] LPR Low pressure receiver m. Mass flow rate [kgs−1 ] n Compressor rotation speed [rpm] Ndisc Number of discretizations [-] p Pressure [bar] Pel Electric power input [W] . Q Heat flow rate [W] rLV Liquid volume percentage [%] T Temperature [◦ C] T Mean temperature [◦ C] Vd Compressor swept Subscript volume [m3 ] a/air Air convi Internal convective conve External convective DIFF Diffuser eva Evaporator exp ExperimentalPDF Image | Dynamic Modelling and Validation of an Air-to-Water Reversible R744
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