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Effect of an Internal Heat Exchanger on the Performances of a Double Evaporator Ejector Refrigeration Cycle

Fluid Dynamics & Materials Processing 2023年第5期19卷 1115-1128页

作者： Rachedi Khadraoui Latra Boumaraf philippe haberschill Mechanical Engineering Department Badji Mokhtar UniversityAnnabaAlgeria Center for Thermal Sciences of Lyon INSAVilleurbanneFrance

A theoretical investigation is presented about a double evaporator ejector refrigeration cycle(DEERC).Special attention is paid to take into account the influence of the sub-cooling and superheating effects induced by an internal heat exchanger(IHX).The ejector is introduced into the baseline cycle in order to mitigate the throttling process losses and increase the compressor suction ***,the IHX has the structure of a concentric counter-flow type heat exchanger and is intentionally used to ensure that the fluid at the compressor inlet is *** assess accurately the influence of the IHX on the DEERC performance,a mathematical model is derived in the frame of the dominant one-dimensional theory for *** model also accounts for the friction effect in the ejector mixing *** equations of this model are solved using an Engineering Equation Solver(EES)for different *** are:R134a as baseline fluid and other environment friendly refrigerants used for comparison,namely,R1234yf,R1234ze,R600,R600a,R290,R717 and *** simulation results show that the DEERC with an IHX can achieve COP(the coefficient of performance)improvements from 5.2 until 10%.

关键词： Refrigeration cycle double evaporator ejector IHX performance improvement environment-friendlyrefrigerants

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Modeling and Parametric Study of the Heat Transfer Inside a Lithium Bromide Flow Confined by Wire Screen

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Journal of Energy and Power Engineering 2015年第5期9卷 417-425页

作者： Herbert Obame Mve Romuald Rulliere philippe haberschill Peugeot Societe Anonyme Peugeot Citrogn Centre Technique de Velizy Velizy Villacoublay Cedex 78943 France Centre National de la Recherche Scientifique Institut National des Sciences Appliquees de Lyon Centre d'Energetique et de Thermique de Lyon Villeurbanne Cedex 69621 France

The present study deals with the numerical analysis of heat transfer inside a lithium bromide-water solution flowing down between finely meshed plastic wire screens. These screens confine the flow through capillary action while allowing the water vapour transfer inside an innovative absorber technology. The complex menisci shape formed on the confinement grid level, where the surface tension forces are of first importance, are reconstructed by a volume-of-fluid model. A continuum surface force model is used to account for the surface tension force. A static contact angle is used to define the wall adhesion. A new algorithm, consisting to set an unique constant temperature at the liquid/vapour interface and to determine the evolution of heat transfer characteristics over the simulation domain, has been implemented and validated by analytical solution. A parametric study has been conducted to determine the effect of the geometry, the contact angle and the shape of the wire on the heat transfer.

关键词：传热特性溴化锂约束建模筛网流量表面张力几何形状毛细管作用

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