Results of an experimental study of an advanced jet-pump refrigerator operating with R245fa

Eames, I.; Ablwaifa, Ali E.; Petrenko, V.O.

doi:10.1016/j.applthermaleng.2006.12.009

Cited by 108 publications

(47 citation statements)

References 6 publications

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“…Yan et al [13] investigated the optimum area ratios of the nozzle/mixing chamber and operating conditions with an experimental setup. Eames et al [14] confirmed that the nozzle exit position (NXP) and primary nozzle geometry had a strong influence on the entrainment performance. Varga et al [15] and Rusly et al [16] also observed that the position of the nozzle was an important design parameter, and the nozzle exit position affected the critical back pressure considerably.…”

Section: Introductionmentioning

confidence: 75%

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Yin

et al. 2016

Applied Sciences

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Abstract:To reduce dust generated from drilling processes, a reverse circulation drilling method based on a supersonic nozzle is proposed. The suction performance is evaluated by the entrainment ratio. A series of preliminary laboratory experiments based on orthogonal experimental design were conducted to test the suction performance and reveal the main factors. Computational fluid dynamics (CFD) were conducted to thoroughly understand the interaction mechanism of the flows. The Schlieren technique was further carried out to reveal the flow characteristic of the nozzle. The results show that the supersonic nozzle can significantly improve the reverse circulation effect. A high entrainment ratio up to 0.76 was achieved, which implied strong suction performance. The CFD results agreed well with experimental data with a maximum difference of 17%. This work presents the great potential for supersonic nozzles and reverse circulation in dust control, which is significant to protect the envrionment and people's health.

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Section: Introductionmentioning

confidence: 75%

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Yin

et al. 2016

Applied Sciences

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“…R245fa as working fluid in the low-temperature solar power rankine cycle system is feasible and the performance is acceptable [4]. Eames's experiment [5] results demonstrate that low-grade heat can be used to drive efficient jet-pump refrigeration systems, using R245fa as their working fluid, for high temperature applications, such as air conditioning.…”

Section: Introductionmentioning

confidence: 97%

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

Liu¹,

Huo²,

Liu³

et al. 2015

ENG

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Numerical simulation on R245fa condensation inside an inner diameter of 8 mm horizontal tube is researched in this paper. The effect of variation in velocity, condensation temperature and superheat of inlet steam and variation in cooling water temperature on heat transfer coefficient are investigated as a parametric study. Condensation process of steam has been successfully modeled by applying a user defined function (UDF) added to the commercial computational fluid dynamics (CFD) package. By analyzing the corresponding condensate contours and the curves of local heat transfer coefficient, the relationships between condensation heat transfer coefficient and various parameters of R245fa inside horizontal tube are obtained. It shows that the heat transfer coefficient increases by the increase in velocity, condensation temperature and superheat of inlet steam and the decrease in cooling water temperature. The errors between the heat transfer coefficient of simulation result and model of Wang and Shah are within ±30%. The parametric study will provide the basis for designing efficient heat exchangers of R245fa.

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“…The effect of operating conditions on the performance of the ejector is relatively well established when compared with the geometrical effects (Ruangtrakoon et al 2013;Varga et al 2009;Sankarlal & Mani, 2005). The most influencing geometrical parameters over the performance of ejector are the area ratio (ratio of the area between constant area mixing chamber to primary nozzle throat), the primary nozzle exit position, the convergent angle of the constant pressure mixing section, and the length of constant area mixing section (Eames et al 2007;Jia & Wenjian, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…This waste energy can be effectively used for cogeneration purpose and to drive an Ejector Refrigeration System [ERS]. The simpler construction, robust design, low capital and maintenance costs and the use of eco-friendly refrigerants are the major advantages of this system (Eames et al 2007;Cizungu et al 2001;Ameur et al 2015). Also, it can substantially reduce electricity consumption for refrigeration and air conditioning applications since the only element which consumes electric power in the cycle is a liquid refrigerant pump.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Studies of a Steam Ejector on the Effect of Nozzle Exit Position and Suction Chamber Angle to Fluid Flow and System Performance

Ramesh¹,

Sekhar²

2017

JAFM

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Nozzle exit position [NXP] plays a vital role in the performance of the ejector, but its values are specified in a range for the required operating condition. In this study instead of the range of values, a specific value, named as entrainment diameter is developed and its effect on the performance of the ejector is studied for several combinations of suction chamber angle using numerical method. The effect of the condenser and boiler pressures on the performance of the ejector are also studied to ensure the off-design operating conditions. The entrainment diameter of an ejector is derived analytically by solving one dimensional compressible fluid flow equations using MATLAB. To study the effect of entrainment diameter on the performance of the ejector, CFD technique is employed. Analytical and numerical results are validated with experimental data available in the previous studies. For 7 kW refrigeration capacity, it is inferred that the suction chamber angle of 18° and the corresponding entrainment diameter 90.8 mm with the NXP of 23.62 mm yield the maximum entrainment ratio. The study predicts that the performance of the ejector is highly influenced by the pressure increment at the exit of the nozzle, while the suction chamber angle is between 12° to 21°.

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Results of an experimental study of an advanced jet-pump refrigerator operating with R245fa

Cited by 108 publications

References 6 publications

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

Analytical and Numerical Studies of a Steam Ejector on the Effect of Nozzle Exit Position and Suction Chamber Angle to Fluid Flow and System Performance

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