Investigation of thermo-physical fluid properties effect on binary fluid ejector performance

Hassan, Mouhammad El; Assoum, Hassan; Bukharin, Nikolay; Abed-Meraïm, Kamel; Sakout, Anas

doi:10.1016/j.egyr.2019.11.076

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…Several studies showed that the ejector configuration strongly affects the performance of an ejector refrigeration system [3,[8][9][10][11][12]. It was also found that when two chemically distinct fluids are used in the forward and reverse Rankine cycles of an ejector refrigeration system, the system COP can be enhanced [4,13]. It is important to note that the enhancement of the ejector performance also depends on the proper selection of the binary fluids with an optimal set of thermo-physical properties for each application.…”

Section: Introductionmentioning

confidence: 99%

Numerical Characterization of the Flow Dynamics and COP Estimation of a Binary Fluid Ejector Ground Source Heat Pump Cooling System

Hassan

2022

Fluids

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Ejector-based refrigeration systems can make direct use of many forms of thermal energy, such as solar thermal, waste heat, biogas, or natural gas. The present paper describes the estimation of the thermal coefficient of performance (COP) of a binary fluid ejector ground source heat pump (BFE GSHP) cooling system. A method for fluid selection was defined based on the favorable thermo-physical properties of the working fluids. A short list of fluid pairs were selected based on their favorable properties for the BFE GSHP cooling system. Computational Fluid Dynamics (CFD) investigation was conducted for the selected fluid pairs and a suitable ejector geometry is proposed for the high compression ratios encountered in the GSHP applications. The mixing between primary and secondary fluids was investigated using physical analysis of the CFD results. The effect of the fluids’ thermo-physical properties on the system performance was also discussed.

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Section: Introductionmentioning

confidence: 99%

Numerical Characterization of the Flow Dynamics and COP Estimation of a Binary Fluid Ejector Ground Source Heat Pump Cooling System

Hassan

2022

Fluids

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“…In addition to a proper fluid selection, the mixing between the primary and secondary fluids, and thus the entrainment ratio, is one of the most critical parameters that affect the supersonic ejector's performance [1][2][3][4][5][6][7]. A good understanding of the mixing mechanism, and thus the entrainment, is of high interest for the proper choice of ejector geometry according to the fluids' properties and the system operating conditions [4,5,8].…”

Section: Introductionmentioning

confidence: 99%

“…and thus the entrainment ratio and ejector performance. It should be noted that the ejector geometry should be optimized for each set of operating conditions [19,20] and working fluid combination [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that there is a need to improve the ejector performance in order to make ejector-based refrigeration systems economically viable [14,21,22]. It was found that the use of two chemically distinct fluids in the forward and reverse Rankine cycles of an ejector refrigeration system could enhance the thermal COP [1,3,6,10]. El Hassan et al [3] found that the entrainment ratio, and thus the ejector performance, decreased with an increase in the molecular mass of the primary fluid.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the use of two chemically distinct fluids in the forward and reverse Rankine cycles of an ejector refrigeration system could enhance the thermal COP [1,3,6,10]. El Hassan et al [3] found that the entrainment ratio, and thus the ejector performance, decreased with an increase in the molecular mass of the primary fluid. However, the entrainment ratio increased with the molecular mass of the secondary fluid.…”

Section: Introductionmentioning

confidence: 99%

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System COP of Ejector-Based Ground-Source Heat Pumps

Hassan

2022

Energies

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Compared to mechanical compressors, ejector-based refrigeration systems can make direct use of many forms of thermal energy, including waste heat, solar thermal, or biogases. It is known that SE systems have a lower thermal efficiency compared to mechanical compressors because of their lower performance at high compression ratios. In the present work, binary fluid ejector heat pumps with high efficiency are presented based on a proper selection of the binary fluids and the ejector geometry for specific operating conditions of a ground-source heat pump cooling system (GSHP). The existing literature on ejector-based refrigeration systems considers the thermal COP and does not account for many energy losses across the system. In the present paper, the system COP of an ejector-based GSHP that accounts for all energy exchange processes is determined. A method for the calculation of the work done by the boiler feed pump, the refrigeration expansion valve, and the ground loop circulation pump is presented. The influence of the condenser temperature on the entrainment process and the system COP is also discussed. The estimated overall system COP for the three top-ranked binary fluid candidates under various operating conditions was found to range from 1.55 to 3.06.

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Thermal performance of an absorption-assisted two-stage ejector air-to-water heat pump

Wang

Spitzenberger

et al. 2021

Energy Conversion and Management

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Investigation of thermo-physical fluid properties effect on binary fluid ejector performance

Cited by 9 publications

References 5 publications

Numerical Characterization of the Flow Dynamics and COP Estimation of a Binary Fluid Ejector Ground Source Heat Pump Cooling System

Numerical Characterization of the Flow Dynamics and COP Estimation of a Binary Fluid Ejector Ground Source Heat Pump Cooling System

System COP of Ejector-Based Ground-Source Heat Pumps

Thermal performance of an absorption-assisted two-stage ejector air-to-water heat pump

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