Thermodynamic analysis and optimization of a jet ejector refrigeration cycle used to cool down the intake air in an IC engine. (July 2019)

• Record Type: Journal Article
• Authors: Galindo, J.; Dolz, V.; Tiseira, A.; Ponce-Mora, A.
• Is Part Of: International journal of refrigeration. Volume 103(2019)
• Page Start: 253
• Page End: 263
• Publication Date: 2019-07
• Subjects: Waste heat recovery -- Jet ejector refrigeration cycle -- Internal combustion engine -- Performance optimization -- Genetic algorithm; Récupération de chaleur perdue -- Cycle frigorifique à éjecteur à jet -- Moteur à combustion interne -- Optimisation des performances -- Algorithme génétique; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2019.04.019
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: Estimation of the feasibility of jet ejector cycle to cool down IC engine intake air. Analysis of the system response in off-design conditions. Ejection cycle optimization and cycle integration with light duty IC engine. Analysis of the numerical simulation of a jet ejector. Abstract: The present paper evaluates a jet ejector refrigeration system intended to cool down diesel engine intake below ambient conditions. Performance is assessed by means of 1D thermodynamic model of the cycle fed with ejector maps obtained with CFD code using R134a as working fluid. In the first study, no particular ejector geometry is fixed thus allowing the genetic algorithm to adapt the cycle to different engine conditions. Following this approach engine intake temperatures close to 0 ∘ C can be attained in those engine operating points in which exhaust thermal power is sufficient to drive the jet-ejector refrigeration system. In the second evaluation, ejection cycle configuration which provided best results for the most frequent operating point in a standard driving, designated as 2000 rpm and 50% load, is selected. With this particular configuration the rest of engine operating points are reassessed. In this study performance degradation is found away from the design point showing that ejector size is a limiting factor.