Impact of primary nozzle area ratio on the performance of ejector refrigeration system

Thongtip, Tongchana; Aphornratana, Satha

doi:10.1016/j.applthermaleng.2020.116523

Cited by 17 publications

(3 citation statements)

References 28 publications

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“…These parameters include the nozzle area ratio [38], the mixing area ratio [39], and the length-to-diameter ratio [40][41][42]. A greater mass ow rate is produced by a larger nozzle area ratio [43]. The ratio of the mixing area to the neck area is known as the mixing area ratio.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Kumar,

Subbarao

2024

Preprint

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This research experimentally compares the performance of two variable area ejectors designed based on the Constant Rate of Momentum Change (CRMC) approach and the Constant Rate of Kinetic Energy Change (CRKEC) approach. Ejector systems were designed for specific design and operating conditions to perform experiments. The pressure recovery ratio (PRR) and entrainment ratio (ω) at on-design operating conditions were compared using the experimental results. The study also optimized the entrainment ratio of both systems at off-design conditions. The results indicate that both variable-area ejectors based on CRMC and CRKEC have their own advantages and limitations in terms of performance and suitability for specific applications. CRMC ejectors provide higher entrainment ratios (0.512) and lower pressure recovery ratios (0.178), while CRKEC ejectors provide slightly higher pressure recovery ratios (0.18) and lower entrainment ratios (0.5) at on-design conditions. Furthermore, the study investigated the off-design impact of nozzle exit positions (NXPs) and the pressure of motive and secondary flows on the entrainment ratio of both ejectors.

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Section: Introductionmentioning

confidence: 99%

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Kumar,

Subbarao

2024

Preprint

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“…Another advantage of using steam as the working fluid over modern refrigerants is that the waste steam or steam tab from industrial boilers can be directly used to drive the ejector, while for the refrigerant, the heat exchanger is required to generate refrigerant vapor to operate the ejector. Thus, the practical use of the steam ejector refrigerator has been the main focus of several researchers [23][24][25][26][27]. The main aim is to improve the system COP or entrainment ratio.…”

Section: Introductionmentioning

confidence: 99%

“…This critical operating condition is determined by the common performance curves in which the entrainment ratio (Rm) or system COP versus the condenser saturation pressure is illustrated. Therefore, an ejector performance assessment is extensively discussed using the common performance curve as proposed by [16,17,24]. Their aims were to indicate the performance improvement via geometrical optimization.…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of an Optimal Performance Map of a Steam Ejector Refrigeration System

Sutthivirode

Thongtip

2022

Energies

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An experimental determination of optimal performance of a steam ejector refrigerator was proposed which aims to indicate the optimal performance under various heat source temperatures. A small-scale steam ejector refrigerator test bench was constructed to carry out the experiment and to determine the optimal performance map. Three primary nozzles with throat diameters of 1.4, 1.6, and 1.8 mm, were tested with an ejector throat diameter of 14.5 mm, providing the ejector area ratios of 107, 82, and 65, respectively. For a particular working condition, the boiler temperature was varied to determine the maximum COP which is recognized as the optimal operation. It was found that the secondary fluid stream is first choked at the optimal boiler temperature. This optimal point varied significantly with the evaporator temperature, condenser pressure, and ejector area ratios. It was found that this steam ejector refrigerator could be operated under the optimal boiler temperature between 102.5 and 117.5 °C depending on the ejector area ratio, evaporator temperature, and condenser pressure. The optimal performance map is beneficial to further control the heat source temperature so that the maximum COP is achieved.

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A comprehensive exploration of ejector design, operational factors, performance metrics, and practical applications

Kumar,

Yadav,

Kumar

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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Impact of primary nozzle area ratio on the performance of ejector refrigeration system

Cited by 17 publications

References 28 publications

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Experimental Determination of an Optimal Performance Map of a Steam Ejector Refrigeration System

A comprehensive exploration of ejector design, operational factors, performance metrics, and practical applications

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