Thermodynamic Modelling of an Ejector with Compressible Flow by a One-Dimensional Approach

Antonio, Yveline Marnier; PÉRILHON, Christelle; Descombes, Georges; Chacoux, Claude

doi:10.3390/e14040599

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…Our analysis is based on the integral method [6].This method is based on a one-dimensional model of the isentropic flow of ideal gases. It considers the characteristics of the driving and induced fluids at the mixing chamber inlet and the characteristics of the mixture at the mixing chamber exit.…”

Section: Working Methodsmentioning

confidence: 99%

Simulation and comparison of combined ejector-absorption and single effect absorption refrigeration systems

2020

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Refrigeration by absorption is gaining more and more importance nowadays especially in applications where the source of energy used in the generator is renewable. However the major problem of this type of refrigeration lies in the COP, which seems to be weaker than compression machines. The use of an ejector is one of the means that can help overcome this problem. In this work, we are interested in the ammonia-water absorption cycle comprising a gas-gas ejector interposed between the generator and the condenser. We suppose that adding a flash tank between the condenser and the evaporator could help improve the entrainment ratio of the ejector. Simulations using the Hysys software are performed in order to look for the optimal conditions for the work of this machine and to make a comparison in terms of performance with single effect cycles. Results showed a significant improvement in the COP and proved therefore that it has better performance than single effect cycles.

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Section: Working Methodsmentioning

confidence: 99%

Simulation and comparison of combined ejector-absorption and single effect absorption refrigeration systems

2020

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“…liquid utilization and working expense is limited. Numerous variables influence fly ejector execution, including the liquid sub-atomic weight, feed temperature, blending tube length, spout position, throat measurement, thought process speed, Reynolds number, pressure proportion, and explicit heat proportion [6][7][8][9].…”

Section: Revised Revised Manuscript Received On January 15 2020mentioning

confidence: 99%

Performance Optimization of Ejector using Computation Fluid Dynamics

Prabhahar,

Prakash,

Valiyangal

et al. 2020

IJRTE

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Ejector is a device used for carry low pressure fluids with no mechanical force, high pressure flow. This contains the main nozzle, chamber for suction, chamber for mixing and diffu ser.It is used in vaccum pumps, condensers, steam refrigeration, Because of its simple structure, gas mixing, pneumatic transport (no moving parts) and reliable operation. It is also used in pumps for lifting slurries and waste material containing solids from tanks and sumps. Due to their simplicity and high reliability, however, jet ejectors are widely used in industries with low efficie ncy. The project's goal is to optimize the efficiency of jet ejectors for each operating condition.Consequently, the primary fluid consumption and operating cost is minimized. A commercial computational fluid dynamics tool would be used to analyse the flow characteristics inside the ejector geometry. The results of the CFD simulation could be used to understand the effect of fluid velocity and pressure ratio on the ejector performance. The analysis would also be carried out by varying the primary and secondary nozzle dimensions. Performance of ejectors under various operating conditions is generally obtained through an experimental testing of prototype or scaled ejectors. The availability of performance parameters for such ejectors is limited, and experimental testing can be cost prohibitive.

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“…The method used, known as the "integral" or "thermodynamic model", is based on the model of the one-dimensional isentropic flow of ideal gases. [7] Continuity Equation: q3 = q1 + q2…”

Section: Ejector Modellingmentioning

confidence: 99%

COP enhancement and comparison of different absorption cooling systems

2020

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The absorption refrigeration machines represent a good alternative to compression refrigeration machines but the major problem of this type of refrigeration lies in the COP, which seems to be less efficient. Several researches are carried out to improve the performances of these machines such as the combination with the technology of the ejectors. In this work, we are interested in the three ammonia-water absorption cycles: Single effect absorption, Ejector-absorption and Combined ejector-flash tank absorption cycles. A gas-gas ejector would be installed between the generator and the condenser. We suppose that adding a flash tank between the condenser and the evaporator could help improve the entrainment ratio of the ejector. We used simulations in order to compare the performances of these three different cycles. The simulation results demonstrate that the combined ejector-flash tank absorption cycle performs better than others.

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Thermodynamic Modelling of an Ejector with Compressible Flow by a One-Dimensional Approach

Cited by 17 publications

References 6 publications

Simulation and comparison of combined ejector-absorption and single effect absorption refrigeration systems

Simulation and comparison of combined ejector-absorption and single effect absorption refrigeration systems

Performance Optimization of Ejector using Computation Fluid Dynamics

COP enhancement and comparison of different absorption cooling systems

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