Performance analysis of auxiliary entrainment ejector used in multi-evaporator refrigeration system

Li, Shengyu; Lü, Jun; Yan, Jia; Hu, Yafei

doi:10.1016/j.tsep.2022.101307

Cited by 5 publications

(2 citation statements)

References 62 publications

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“…One of the most important utilities for people’s daily lives is refrigeration systems. The vapor-compression refrigeration cycle (VCRC) is widely used in domestic and industrial sectors due to its higher Coefficient of Performance (COP) [ 1 , 2 , 3 ]. VCRCs have a share of about 30% of the total world energy consumption, and this ratio may increase due to refrigerant leakage [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Comparative Study of Vapor-Compression Refrigeration Cycle using Al2O3 Nanoparticle with Low-GWP Refrigerants

2022

Entropy

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Nanorefrigerant is a mixture of nanoparticles and pure refrigerant, which can increase heat transfer characteristics in refrigeration and air conditioning equipment. The performance of four different Al2O3 nanorefrigerants and their pure fluids (R600a, R134a, R1234yf, and R1233zd(E)) is analyzed in a vapor-compression refrigeration cycle. The enthalpy of a nanorefrigerant in the refrigeration cycle is calculated by using the prediction method based on the density of nanorefrigerant. A numerical model is established for the thermodynamic analysis, and the results show that adding nanoparticles to the pure refrigerant enhances heat transfer in heat exchangers, increases cooling capacity, reduces compressor power consumption, and finally improves the performance of the refrigeration system. The COP improvement of R1233zd(E) + Al2O3 nanorefrigerant is the highest, and the COP improvement of R134a + Al2O3 and R1234yf + Al2O3 are close to each other. When the mass fraction of Al2O3 nanoparticles increases to 0.30%, the COP of R1233zd(E) and R600a increases by more than 20%; the maximum exergy efficiency is 38.46% for R1233zd(E) + Al2O3, and the minimum exergy efficiency is 27.06% for pure R1234yf. The results provide a basis for the application of nanorefrigerants in the vapor compression refrigeration cycle.

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Section: Introductionmentioning

confidence: 99%

A Theoretical Comparative Study of Vapor-Compression Refrigeration Cycle using Al2O3 Nanoparticle with Low-GWP Refrigerants

2022

Entropy

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“…Thus, the novel research based on the heat-powered refrigeration machine is a main focus in this research field. Thus, several researchers have proposed the novel heatpowered refrigerator as supported by Mahmoudian et al [9], Eames et al [10], Li et al [11], Aidoun et al [12], and Fang et al [13].…”

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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Performance improvement potential of ejector-based dual-evaporator refrigeration system using photovoltaic modules and nano-refrigerant

Li,

Lu,

Xiao

et al. 2024

Applied Thermal Engineering

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Performance analysis of auxiliary entrainment ejector used in multi-evaporator refrigeration system

Cited by 5 publications

References 62 publications

A Theoretical Comparative Study of Vapor-Compression Refrigeration Cycle using Al2O3 Nanoparticle with Low-GWP Refrigerants

A Theoretical Comparative Study of Vapor-Compression Refrigeration Cycle using Al2O3 Nanoparticle with Low-GWP Refrigerants

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

Performance improvement potential of ejector-based dual-evaporator refrigeration system using photovoltaic modules and nano-refrigerant

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