Thermodynamic analysis of the ejector refrigeration cycle using the artificial neural network

Rashidi, Majid; Aghagoli, A.; Raoofi, R.

doi:10.1016/j.energy.2017.04.089

Cited by 54 publications

(17 citation statements)

References 37 publications

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“…Various LG heat harvesting technologies have been put forward continually [2][3][4][5]. Among all these feasible proposals, a class of thermally driven refrigerators, mainly including absorption refrigerator [6][7][8], adsorption refrigerator [9][10][11], and ejector refrigerator [12][13][14], are particularly attractive to researchers due to the fact that around 15% of the electricity generated worldwide is consumed by air-conditioning processes [15]. As the promising alternatives of traditional vapor compression refrigerator, thermally driven refrigerators possess the merits of fewer moving parts, low noise, high reliability, low operation cost, long lifetime, adaptability to a wide range of heat source temperatures, and the possibility of using environmentally-friendly refrigerants [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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In order to investigate the performance of a class of thermally driven refrigerators, usually driven by low-grade thermal energy, a generic thermodynamic model of three-heat-source refrigerator without involving any specific heat-transfer law is put forward by adopting low-dissipation assumptions. Based on the proposed model, the analytical expressions for the coefficient of performance (COP) and cooling power of the system are derived in terms of well-defined dissipation parameters and contact time durations between the system and heat reservoirs. One essential parameter accounting for the size ratio of the two coupled subsystems inside the overall system is introduced in light of the practical meaning of the reversible entropy change. With the help of the aforementioned parameter, the optimal relation between the COP and cooling power is obtained. The optimal operation region and optimal construction of the overall system are further determined for the first time. In addition, the influences of the dissipation and temporal symmetries are discussed in detail, according to which the upper and lower bounds of the COP at maximum cooling power are firstly obtained under two extreme situations. Experimental and simulated data from previous reported works are collected to illustrate the validity and practical significance of the proposed model and associated results. A limit case is presented to highlight the generality of the model.

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Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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“…Rashidi et al [15] analyzed the ejector refrigeration cycle using the artificial neural network. In this study, they described the results of the ejector refrigeration cycle using R600 as a working fluid.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance Analysis of Gas Liquefaction Cycles for Cryogenic Applications

Yılmaz¹

2018

Journal of Thermal Engineering

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In this paper presents an analysis of the thermodynamic cycles the most commonly used for the liquefaction of gases in order to evaluate and compare their performance under given working conditions and system component efficiencies. The cycles considered are simple Linde-Hampson cycle, precooled Linde-Hampson cycle, Claude cycle, and Kapitza cycle. First and second law relations are investigated for each cycle and performance parameters are evaluated. Thermodynamically performances criteria are compared of cycles with respect to the each other. Cycles are model in the computer environment and analyzed with Engineering Equation Solver (EES) software program. Cycles of the liquefaction fractions, coefficient of performances and second law of efficiencies are calculated for the liquefaction of different gases. Second law efficiencies are calculated as 13.4%, 21.8%, 62.9%, and 77.2% for simple Linde-Hampson cycle, pre-cooled Linde-Hampson cycle, Claude cycle, and Kapitza cycle, respectively. Claude and Kapitza cycles give better performance but simple and precooled Linde-Hampson cycle has the advantages of the simplicity of their setup. RESULTS AND DISCUSSIONGas liquefaction process is a heat rejection process from the gas between inlet state of the compressor and outlet state of the J-T valve. Due to this reason the refrigeration effect per unit mass of the liquefied gas l q are equal for all cycles. Hence, equation 1, 14 and 18 yield same results. The data obtained from Tables 1, 2, 4 and 5 represents performance parameters of the simple Linde-Hampson, precooled Linde-Hampson, Claude and Kapitza cycle for various fluids. The different gases have different performance parameters due to differences in their thermophysical properties.

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“…Moreover, in prime mover systems ejectors are used for gas removal (Fig.1 -part A) in the Ferrari 3 condenser of steam power plants [7], and in inverse cycles (refrigeration technology) they are proposed [8][9][10]. In aircrafts, ejectors can be used for increasing the propelling force, changing the jet direction, increasing auxiliary flow and for aircraft ventilation.…”

Section: Introductionmentioning

confidence: 99%

Validated ejector model for hybrid system applications

Ferrari

Pascenti

Massardo

2018

Energy

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The aim of this work is the presentation of a new model for ejector performance calculation using a commercial tool. Due to the critical issues in recirculation performance, special attention is devoted to applications in hybrid systems based on high temperature fuel cells. The theoretical activity is supported by an experimental rig able to operate tests on ejectors at different operative conditions, with a layout similar to the fuel cell anodic recirculation. The model validation, operated considering experimental data obtained with this rig, is essential to evaluate the tool performance for design and off-design calculations. This aspect is particularly critical due to important limitations in the recirculation ratio (especially for the anodic side), to avoid unacceptable operative conditions in the fuel cells.The results presented in this work were obtained with this validated model for an ejector applied on the anodic side of a Solid Oxide Fuel Cell (SOFC). A parametric analysis was carried out to show the effects of several parameters on the recirculation performance. The fully independent analysis of the influence of different properties (carried out with a specifically validated model) is an important innovative result for the application of such ejectors on high temperature fuel cells.

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Thermodynamic analysis of the ejector refrigeration cycle using the artificial neural network

Cited by 54 publications

References 37 publications

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Thermodynamic Performance Analysis of Gas Liquefaction Cycles for Cryogenic Applications

Validated ejector model for hybrid system applications

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