Research Article Analysis of Hybrid Ejector Absorption Cooling System Doniazed Sioud and Ahmed Bellagi Department of Energy Engineering, Ecole Nationale d’Ing´ enieurs de Monastir (ENIM), University of Monastir, Tunisia Correspondence should be addressed to Doniazed Sioud; siouddoniazed@gmail.com Received 17 July 2018; Revised 25 February 2019; Accepted 17 March 2019; Published 2 September 2019 Academic Editor: Oronzio Manca Copyright © 2019 Doniazed Sioud and Ahmed Bellagi. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In this paper, a hybrid ejector single-efect lithium-bromide water cycle is theoretically investigated. Te system is a conventional single-efect cycle activated by an external steam-ejector loop. A mathematical model of the whole system is developed. Simulations are carried out to study the efect of the major parameters of the hybrid cycle on its performances and in comparison with the conventional cycle. Te ejector performance is also investigated. Results show that the entrainment ratio rises with steam pressure and condenser temperature, while it decreases with increasing generator temperature. Te efect of the evaporator temperature on ejector performance is negligible. It is shown also that the hybrid cycle exhibits better performances than the corresponding basic cycle. However, the performance improvement is limited to a specifc range of the operating parameters. Outside this range, the hybrid system behaves similar to a conventional cycle. Inside this range, the  increases, reaches a maximum, and then decreases and rejoins the behavior of the basic cycle. Te maximum , which can be as large as that of a conventional double-efect cycle, about 1, is obtained at lower temperatures than in the case of single-efect cycles. 1. Introduction Cooling and air conditioning are essential for small scale and large industrial process applications. While systems applying the vapor-compression technique use environmental harmful refrigerants (FCC, FCHC, etc.), absorption technique for production of cold is based on environment friendly working fuids, namely, aqueous lithium bromide solutions with water as refrigerant or water-ammonia mixtures with ammonia as refrigerant. Tis technique however sufers from low perfor- mances. Tat is the reason why new hybrid and combined confgurations are proposed, implying the integration of new components, particularly ejectors, in order to enhance the performances. Various confgurations incorporating ejectors were stud- ied. Exhaustive review of the literature on this subject can be found in Besagni et al. [1, 2]. Elaborated CFD-models of ejectors developed to evaluate the ejector performances in both on-design and of-design conditions have been also pub- lished [3]. Combined cycles were investigated with ejector set at the absorber inlet [4–9].  of such cycles are reported to be higher by about 2–4% than that of conventional cycles. Principally, investigations indicate that  of the combined confguration are greater or equal to that of single-efect cycles, but reached at lower generator temperatures. Other confgurations are discussed where the ejector is located at the condenser inlet of single-efect systems [10–14]. Teoretical investigations confrm the improvement of the performances in comparison with basic single-efect cycles. Experimental studies [15] show that this combined cycle is 30- 60% more performant than conventional absorption cycles and almost reaches the  of double-efect systems. Besides modifying confgurations, adding a fash tank between ejec- tor and evaporator was also proposed [16, 17]. Ejector improved double-efect absorption system was also investigated [18–20]. Te  of the proposed refrigera- tion scheme was found to increase with the temperature of the heat source until this temperature reaches 150 ∘ C. Beyond that value, the new cycle worked as a conventional double-efect cycle. Another confguration was studied with an ejector cou- pled to vapor generator [21–23]. Tis procedure is intended to enhance the concentration process by compressing the vapor produced from the lithium bromide solution in order to reheat the solution from which it came. Results showed that  of the new cycle increases especially with the heat source temperature. Hindawi Journal of Engineering Volume 2019, Article ID 1862917, 13 pages https://doi.org/10.1155/2019/1862917