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

Wang, Pengtao; Ma, Hongbin; Spitzenberger, Jeremy; Abu-Heiba, Ahmad; Nawaz, Kashif

doi:10.1016/j.enconman.2020.113761

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…Initially introduced in 1939, the notion that an ejector's entrainment ratio is influenced by the molecular weight of the primary and secondary fluids was demonstrated in [9]. In [10], an ejector heat pump was tested and analyzed. It was shown that the ejector performance was improved by using binary fluids (HFE7500 and water).…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Supersonic Binary Fluid Ejector Performance

Bukharin

Hassan

2023

Fluids

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Ejectors are simple mechanical devices with no moving parts which convert the pressure energy of a motive fluid to kinetic energy and generate suction of the secondary fluid. The ability to recover waste heat, to operate using solar power and the ability to use geothermal energy make ejector-based systems attractive in different industrial applications. The main challenge of ejector-based refrigeration systems is their relatively low coefficient of performance (COP). In order to increase the ejector performance, two chemically distinct fluids can be used in the refrigeration cycle. It is suggested that a higher molecular mass be used for the motive fluid to improve the entrainment ratio of the binary fluid ejector (BFE) and thus the system COP. Inert gas combinations of argon–helium and krypton–air are studied in this paper using computational fluid dynamics (CFDs) and experimental measurements. All CFD cases were axisymmetric and the appropriate turbulence model was selected based on experimental validation. Specifically, the entrainment ratio and the static pressure along the ejector wall were measured to validate the CFD predictions. It was found that the molar entrainment ratio was significantly higher in argon–helium compared to krypton–air. The static pressure measurements along the wall, in addition, exhibited good agreement with the results obtained via computational fluid dynamics (CFDs).

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Supersonic Binary Fluid Ejector Performance

Bukharin

Hassan

2023

Fluids

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“…The results showed that the heating coefficient of performance (COP) of the cycle, and so on, outperformed others. Wang et al [ 10 ] presented a gas-fired air-to-water ejector heat pump. The system performance was improved with a high entrainment ratio.…”

Section: Introductionmentioning

confidence: 99%

Effect of Back Pressure on Performances and Key Geometries of the Second Stage in a Highly Coupled Two-Stage Ejector

Yan

Shu

Wang

2022

Entropy

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In this paper, for a highly coupled two-stage ejector-based cooling cycle, the optimization of primary nozzle length and angle of the second-stage ejector under varied primary nozzle diameters of the second stage was conducted first. Next, the evaluation for the influence of variable back pressure on ER of the two-stage ejector was performed. Last, the identification of the effect of the variable back pressure on the key geometries of the two-stage ejector was carried out. The results revealed that: (1) with the increase of the nozzle diameter at the second stage, the ER of both stages decreased with the increases of the length and angle of the converging section of the second-stage primary nozzle; (2) the pressure lift ratio range of the second-stage ejector in the critical mode gradually increased with the increase of the nozzle diameter of the second-stage; (3) when the pressure lift ratio increased from 102% to 106%, the peak ER of the second-stage decreased, and the influence of the area ratio and nozzle exit position of the second-stage ejector on its ER was reduced; (4) with the increase of nozzle diameter of the second-stage, the influence of area ratio and nozzle exit position of the second-stage on the second-stage performance decreased; and (5) the optimal AR of the second stage decreased but the optimal nozzle exit position of the second stage kept constant with the pressure lift ratio of the two-stage ejector.

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“…For the features of simple design, energy-saving and high efficiency, low manufacturing cost, and reliable operation performance [3], it is widely used in various fields of thermal production [4], and provides good prospects for some low-grade waste heat [5]. It can build an efficient and lower energy consumption system [6] and provide a low-temperature environment [7].…”

Section: Introductionmentioning

confidence: 99%

A visual mass transfer study in the ejector considering phase change for multi-effect distillation with thermal vapour compression (MED-TVC) desalination system

et al. 2022

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

Cited by 14 publications

References 31 publications

Numerical and Experimental Investigation of Supersonic Binary Fluid Ejector Performance

Numerical and Experimental Investigation of Supersonic Binary Fluid Ejector Performance

Effect of Back Pressure on Performances and Key Geometries of the Second Stage in a Highly Coupled Two-Stage Ejector

A visual mass transfer study in the ejector considering phase change for multi-effect distillation with thermal vapour compression (MED-TVC) desalination system

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