Investigation of the Effect of the Primary Nozzle Throat Diameter on the Evaporator Performance of an Ejector Expansion Refrigeration Cycle

Seçkin, Candeniz

doi:10.18186/journal-of-thermal-engineering.408659

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…The ejector solar air conditioner is a very effective solution in rural areas and in desert industrial complexes because it has simple assembly and it has an acceptable performance [15,29,30], that's why this system is considered the most attractive than conventional compression technology because it is less expensive [31][32][33][34].…”

Section: Figure 1 Illustrative Schematization Of a Typical Ejectormentioning

confidence: 99%

Performance Analysis of a Solar-Driven Ejector Air Conditioning System Under El-Oued Climatic Conditions, Algeria

Ghodbane

Hussein

2021

Journal of Thermal Engineering

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In order to understand the behavior and to determine the effective operational parameters of a solar-driven ejector air conditioning system at low or medium temperature, a dynamic model depends on the principles of conservation, the momentum mass and energy is developed. For this purpose, the thermodynamic characteristics of the liquid and vapor refrigerant were identified using the Engineering Equation Solver (EES) software. Linear Fresnel solar reflector has been used as a tool to convert solar energy into thermal energy. Water (R718) was used as a refrigerant. The operational conditions for the studied solar-driven ejector air conditioning system are as follows: evaporator temperature "T e =283.15 K", condenser temperature "T c =305.15 K", and generator temperature "T g = 373.15 K". The performance of the ejector air conditioning system was compared as a function of the operating parameters of the subsystem. The average value of thermal efficiency of the Fresnel linear concentrator has reached 31.60 %, the drive ratio "ω" is 0.4934, the performance value of the ejector air conditioning subsystem "COPejc" is 60.664 % and the average value of the thermal performance of the machine "STR" has touched 19.17 %. The results obtained through this scientific subject are stimulating and encouraging, where this technique can be used for air conditioning in desert areas in southern Algeria, where fossil energy (petroleum, gas, etc.) is extracted and produced in various types.

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Section: Figure 1 Illustrative Schematization Of a Typical Ejectormentioning

confidence: 99%

Performance Analysis of a Solar-Driven Ejector Air Conditioning System Under El-Oued Climatic Conditions, Algeria

Ghodbane

Hussein

2021

Journal of Thermal Engineering

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“…Seckin [61] used an empirical method to study the effect of constant pressure twophase ejector primary nozzle throat diameter, on the ejector expansion refrigeration cycle using R134a as the refrigerant. At condenser temperatures of 50, 60 and 70 • C and evaporator temperatures of 0 • C, nozzle throat diameter, condenser temperature and entrainment ratio are affected.…”

Section: Nozzlementioning

confidence: 99%

A Review on Process and Practices in Operation and Design Modification of Ejectors

Koirala

Zhu

et al. 2021

Fluids

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This work reviews the current operational condition and activities on design modification for different applications of ejectors. Ejectors being a simple mechanical system capable of performing multiple fluid related functions (vacuum generation, pumping, mixing, condensing and heat exchanging), have been an essential part of several industrial processes. Two areas have been emphasized; internal flow and application-based modifications in components of ejectors. The geometry and inlet flow conditions were found to be the prime influencing factor of its performance. The objective and application-based modifications were performed on the primary nozzle, secondary nozzle, mixing chamber, throat and diffuser. The resultant performance was found to be dependent on operational condition and fluid type. This emphasizes the requirement of application-based design selection of the technology. In addition, the flow dynamics of condensing, non-condensing, particle and slurry flow has been studied based on available literatures. The one-point final objective is to identify the usability of primary water jet ejectors for active vapor transport and condensation, to replace vacuum pump and condenser in compact domestic water desalination system.

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“…Active control techniques are instrumental, such as suction [10] and blowing [1,4,5,11], and reactive in the form of rotating cylinders [12]. The various studies on the flow through nozzle and diffuser are available in the literature [19][20][21].…”

Section: Figure 1 Suddenly Expanded Flow Field [1]mentioning

confidence: 99%

An Investigation of Effect of Control Jets Location and Blowing Pressure Ratio to Control Base Pressure in Suddenly Expanded Flows

Pathan

Dabeer

Khan

2020

Journal of Thermal Engineering

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The drag force is an essential factor in any projectile, from road vehicles to rocket or aircraft. The total drag includes skin friction drag, wave drag, and base drag. The base drag is the drag due to low pressure in the base region of the projectile. In the case of suddenly expanded flows, due to the sudden expansion of flow from the nozzle into the enlarged duct, the low pressure is created in the base region of the enlarged tube, which results in base drag and hence overall thrust reduced. In this paper, Computational Fluid Dynamic (CFD) analysis is used to analyze the effect of secondary air blowing jets called control jets to control base pressure in the base region of suddenly enlarged duct. These control jets are placed at different Pitch Circle Diameters (PCD) on the base face of the enlarged pipe. The objective of this work is to increase the base pressure up to atmospheric pressure and hence reduces the base drag. Mach number 3.0 is considered for analysis. The CFD analysis is done for different combinations of Area Ratios (AR) (2, 5 and 8), Nozzle Pressure Ratios (NPR) (2, 5 and 8), and PCD (d1, d2, and d3).Further analysis is done for different air blowing pressure ratios (BPR) to optimize air blowing pressure. The analysis results are plotted for different area ratios, nozzle pressure ratios, and PCD of control jets. By observing results, it can be concluded that the base pressure is strongly influenced by AR, NPR, and PCD of control jets. The air blowing pressure should be optimum to save energy, and the optimum values can be selected from the results.

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Investigation of the Effect of the Primary Nozzle Throat Diameter on the Evaporator Performance of an Ejector Expansion Refrigeration Cycle

Cited by 11 publications

References 28 publications

Performance Analysis of a Solar-Driven Ejector Air Conditioning System Under El-Oued Climatic Conditions, Algeria

Performance Analysis of a Solar-Driven Ejector Air Conditioning System Under El-Oued Climatic Conditions, Algeria

A Review on Process and Practices in Operation and Design Modification of Ejectors

An Investigation of Effect of Control Jets Location and Blowing Pressure Ratio to Control Base Pressure in Suddenly Expanded Flows

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