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A low-order hybrid model, which can present the transient behaviors of evaporators, is proposed in this paper. The model is derived from the fundamental conversation of energy and mass of the working fluid flowing though the evaporator, while its geometrical dimensions, thermodynamic coefficients that can be considered as constants and some variables that keep small variety during the operation (such...
In this study, Computational Fluid Dynamics (CFD) technique is employed to investigate the effects of two important ejector geometry parameters: the primary Nozzle Exit Position (NXP) and the mixing section converging angle θ, on its performance. A CFD model is firstly established and calibrated by actual experimental data, and then used to create 95 different ejector geometries and tested under different...
Existing ejector models are either very complex nonlinear ones with coupled equations or empirical correlations suitable for particular ejector geometries and operation conditions, resulting in difficulties for real time applications. Therefore, it is practically important to develop a simple, yet accurate ejector engineering model that will yield better real time control and optimization of ejector...
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