Numerical assessment of steam ejector efficiencies using CFD |
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Authors: | Szabolcs Varga Armando C Oliveira Bogdan Diaconu |
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Affiliation: | aNew Energy Technologies Unit, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4050-123 Porto, Portugal;bUniversity “Constantin Brancusi” of Tg-Jiu, Str. Republicii nr. 1, 210152 Tg-Jiu, Romania |
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Abstract: | Ejector efficiencies for the primary nozzle, suction, mixing and diffuser were determined for the first time, according to their definitions, using an axi-symmetric CFD model. Water was considered as working fluid and the operating conditions were selected in a range that would be suitable for an air-conditioner powered by solar thermal energy. Ejector performance was estimated for different nozzle throat to constant section area ratios. The results indicated the existence of an optimal ratio, depending on operating conditions. Ejector efficiencies were calculated for different operating conditions. It was found that while nozzle efficiency can be considered as constant, the efficiencies related to the suction, mixing and diffuser sections of the ejector depend on operating conditions. |
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Keywords: | Refrigeration system Ejector system Simulation Geometry Ejector Computational fluid Dynamics Calculation Performance EfficiencyMots clé s: Systè me frigorifique Systè me à é jecteur Simulation Gé omé trie É jecteur Dynamique numé rique des fluides Calcul Performance Rendement |
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