Investigation of an ejector powered double-effect absorption/recompression refrigeration cycle

Sioud, Doniazed; Bourouis, Mahmoud; Bellagi, A.

doi:10.1016/j.ijrefrig.2018.11.042

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…The default input parameters used to model the system are shown in Table 5. 30,34,51 The thermodynamic properties of state points of the system based on the input data are presented in Table 6.…”

Section: Modeling Resultsmentioning

confidence: 99%

“…The vaporized working fluid (refrigerant) (10) enters the absorber, where it is absorbed by the strong absorbent solution (6). Lastly, the weak absorbent solution (1) is returned to the high‐temperature generator via the pumps 16,34 …”

Section: System Configurationmentioning

confidence: 99%

“…The fundamental thermodynamic equations, including the mass and energy balance calculations, are written as follows the system units, and all analyses are performed in engineering equation solver (EES) software. To simplify the thermodynamic model, the following assumptions are made 34 : Cycle simulation is performed in steady‐state and steady‐flow conditions. The kinetic and potential energy changes in the components are ignored. The pressure drop and heat loss in all processes have been neglected. The process of expansion valves in the real cycle is assumed to be isenthalpic. The refrigerant at the condenser outlet is a saturated liquid. The refrigerant at the evaporator output is a saturated vapor. The outlet solutions from the absorber and the generators are at equilibrium 33 …”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…Lastly, the weak absorbent solution (1) is returned to the high-temperature generator via the pumps. 16,34…”

Section: System Configurationmentioning

confidence: 99%

See 3 more Smart Citations

Sensitivity analysis of avoidable and unavoidable exergy destructions in a parallel double‐effect LiBr–water absorption cooling system

Zendehnam

Pourfayaz

2022

Energy Science & Engineering

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A parametric study has been carried out based on advanced exergy assessment for a parallel double‐effect LiBr–water absorption chiller. The advanced exergy method provides the real potential of the equipment for improvement in the system by recognizing the avoidable irreversibilities. The sensitivity analysis of various parts of the exergy destruction (endogenous avoidable, endogenous unavoidable, exogenous avoidable, and exogenous unavoidable) in system components and the overall performance (coefficient of performance, exergy efficiency, and modified exergy efficiency) of the system has been done to identify the actual potential of different components of the system to improve the overall performance of the system relative to operational parameters. Operational parameters include the heat source temperature, heat sink temperature, and the difference between the absorption and condensation temperature. The results showed that by modifying and improving the performance of components, 18.5% of the total exergy destruction of the system could be reduced. The modified exergy efficiency reduces sharply (nearly 40%) with the rising heat sink temperature. The endogenous exergy destruction increases in all system components except the condenser and evaporator by the heat source temperature increase. With the increase in the heat sink temperature, the avoidable part of the total exergy destruction in the system increases due to the significant rise in the avoidable exogenous exergy destruction in the components, and the unavoidable endogenous exergy destruction decreases (more than 200%) in the absorber. Increasing the condensation temperature reduces the unavoidable endogenous exergy destruction in the components except for the low‐temperature heat exchanger.

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Section: Modeling Resultsmentioning

confidence: 99%

Section: System Configurationmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…Lastly, the weak absorbent solution (1) is returned to the high-temperature generator via the pumps. 16,34…”

Section: System Configurationmentioning

confidence: 99%

See 2 more Smart Citations

Sensitivity analysis of avoidable and unavoidable exergy destructions in a parallel double‐effect LiBr–water absorption cooling system

Zendehnam

Pourfayaz

2022

Energy Science & Engineering

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“…The of the proposed refrigeration 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-effect cycle. Another configuration was studied with an ejector coupled to vapor generator [21][22][23]. This 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.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hybrid Ejector Absorption Cooling System

Sioud

Bellagi

2019

Journal of Engineering

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In this paper, a hybrid ejector single-effect lithium-bromide water cycle is theoretically investigated. The system is a conventional single-effect cycle activated by an external steam-ejector loop. A mathematical model of the whole system is developed. Simulations are carried out to study the effect of the major parameters of the hybrid cycle on its performances and in comparison with the conventional cycle. The 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. The effect 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 specific range of the operating parameters. Outside this range, the hybrid system behaves similar to a conventional cycle. Inside this range, the COP increases, reaches a maximum, and then decreases and rejoins the behavior of the basic cycle. The maximum COP, which can be as large as that of a conventional double-effect cycle, about 1, is obtained at lower temperatures than in the case of single-effect cycles.

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Proposal of a double ejector-two flash tank absorption refrigeration cycle: Energy, exergy and thermoeconomic evaluation

Dhahi Gharir,

Farshi

2023

Case Studies in Thermal Engineering

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Investigation of an ejector powered double-effect absorption/recompression refrigeration cycle

Cited by 14 publications

References 23 publications

Sensitivity analysis of avoidable and unavoidable exergy destructions in a parallel double‐effect LiBr–water absorption cooling system

Sensitivity analysis of avoidable and unavoidable exergy destructions in a parallel double‐effect LiBr–water absorption cooling system

Analysis of Hybrid Ejector Absorption Cooling System

Proposal of a double ejector-two flash tank absorption refrigeration cycle: Energy, exergy and thermoeconomic evaluation

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