Evaluation of solar-assisted absorption refrigeration cycle by using a multi-ejector
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Evaluation of solar‑assisted absorption refrigeration cycle by using a multi‑ejector Ali Najah Al‑Shamani1 Received: 17 August 2019 / Accepted: 13 March 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The theoretical analysis for the absorption cooling system of the multi-ejectors flash tank has been investigated. In this research, the analysis of the energy balance is conducted to predict the possibility of improvement in the thermal loads components of the absorption cooling system with multi-ejectors -flash tank. The computer program of simulation has been used to assess the single, double and triple ejectors for the absorption cooling system performance by utilizing a solution of the water ammonia as a working liquid, which operated under stable conditions. The results indicate that the cycle with three ejectors has the lower generator and evaporator thermal loads than the other cycles. It is also showed that the generator load for a cycle using double ejectors is higher than other cycles, while the evaporator thermal load is found permanently less than the basic and single cycle and slightly higher than the cycle which has three ejectors. As well as the improvement in overall COPs of the combined cycle using double ejectors under different operating conditions is higher than that of the other combined cycles. It was found that the total COPs for the double ejector cycle are higher by ratios (9.2% and 5%) at higher and lower operation conditions, respectively, than the combined triple ejectors’ cycle. Keywords Components thermal loads · Cooling cycle · Cycle performance · Double and triple ejectors · Single-ejector flash tank absorption
Introduction The ejector that combined with the cycle which has a singlephase absorption demonstrated a possible cycle enhancement in the cycle’s COP [1]. It was demonstrated that COP’s is in the range of 0.86–1.04. The benefit of applying a cycle of ejector cooling is that it could be utilizing thermal energy at levels of temperature greater than 0.333 × 103 K [2]. Thermal energy at these levels of temperatures is obtainable from the absorption cooler absorber. The ejector application in the solar cooling system was rapidly increased by utilizing a various working liquids [3–6]. The main modifications were studied by adding ejectors with two phases which contain a fluid vapor separator (the liquid of flashing) in a single-phase or multi-phase pressure cycles and multiple evaporator cycles. Kornhauser [7] considered the first analyzer for the ejector expansion cooling
* Ali Najah Al‑Shamani [email protected]; [email protected] 1
Al-Furat Al-Awsat Technical University, Kufa 54003, Iraq
cycle by employing R12 as a radiator, and investigated that there is a development in the COP up to 21% during the standard cycle under standard conditions of operating. The kinetic energy has been used by the ejector, which was gotten from the flash gas for increasing the pressure of suction at the compressor [8]. Xu and Ma [9–11] according to those researchers who were u
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