Overall, the ejector is as an expander converting pressure energy into useful work combined with a compressor or with a pump, still being a simple static device with no moving parts. Refrigeration cycle with ejector for second step compression mark j. How multi ejectors work working principle co2 refrigeration. B to c instead of b to c refrigeration cycle with ejector system refrigeration cycle without ejector. The use of the liquid ejector enables the operation of the evaporator in a flooded mode and recirculates the r744 liquid phase, which improves the energy efficiency of the refrigeration system. Transcritical co 2 refrigeration cycle with ejector expansion device daqing li, eckhard a. The performance of the ejector 3 is considerably affected by pressure recovery in the mixing section inside the ejector. The system consists of a pump, boiler, turbine, ejector, condenser, expansion valve, and evaporator. This energy was previously wasted as vortices in the expansion valve. Solar thermal refrigeration systems based on ejector compression technology are thriving because of its.
Pdf on feb 1, 2016, weixiong chen and others published theoretical analysis of ejector refrigeration system performance under overall modes find, read. In order to compare the performance of the ejector expansion refrigeration cycle with the standard vaporcompression cycle, simulations of the two cycles were. Alluding to the fundamental ejector refrigeration cycle in figure 2, the ejector refrigeration framework is made out of two sub cycles, the power sub cycle and the refrigeration sub cycle. Ejector or jet pump refrigeration is a thermally driven technology that has been used for. Thermodynamic analysis of transcritical co2 ejector. Ejector cycle ejecs ejector works as a selfdriving pump drive.
The refrigerator unit based on electrically driven vapor compression technology consumes high energy, associated with high cost and loss of ecosystem. Since last two decades, considerable research effort has been conducted to investigate the influence these parameters. Pdf on jan 1, 2008, stefan elbel and others published ejector. Pdf study of an ejector refrigeration cycle implemented in. Bergander1, dariusz butrymowicz2, kamil smierciew2, jaroslaw karwacki2 1magnetic development, inc. The ejector cycle subsystem employs the following major components. Although the ejector refrigeration cycle has a low cop, the use of waste heat as a heatdriven energy incurs a lower operational cost compared with vapor compression refrigeration system. Introduction refrigeration and airconditioning systems are widely used in airhandling and cooling applications. In the past, ejectors have mostly been used in two different cycles for refrigeration purposes. Cfd simulation of ejector in steam jet refrigeration. This paper presents a numerical investigation of an r744 liquid ejector applied to a supermarket refrigeration system. Herrick laboratories, west lafayette, in 479071077, usa.
A high efficiency ejector refrigeration system a thesis. The new configuration of a transcritical co2 ejector expansion refrigeration cycle combined with a dedicated mechanical subcooling cycle ems is proposed. On the basis of the previous discussion, it can be seen that for solardriven ejector refrigeration technology, including singlestage ejector systems, multistage ejector systems and hybrid systems can be regarded as an alternative way for conventional solar air conditioning. In the connection between the evaporator and the ejector the cold vapour may receive. R404a, r410a, r407c, r423a, r500, r502 and r507c a numerical computation is carried out for finding cop, second law. His setup allowed producing a refrigeration effect by utilizing lowgrade energy. Cers vapor compressionejector refrigeration system eers ejector expansion refrigeration system mers multicomponents ejector refrigeration system ters transcritical ejector refrigeration system greek letters. Effect of operational parameters on a novel combined cycle. The vital component, which decides the effective operation of the ejector expansion refrigeration system, is the ejector. Mazzelli and milazzo conducted both numerical and experimental analyses of a heat source driven supersonic ejector chiller using r245fa as the working fluid. As it is generally known, in the erc the conventional mechanical compressor is replaced with a pump with very low electric power consumption and an ejector.
Pdf theoretical study of ejector refrigeration system with working. Application of the ejector with internal cooling in the ejector refrigeration cycle increases its efficiency. Effect of operational parameters on a novel combined cycle of. Evaluation of solarassisted absorption refrigeration cycle. Design and analysis of ejector refrigeration system using r. Evaluation of solarassisted absorption refrigeration cycle by using a multiejector springerlink. An ejector is an important component of a refrigeration system that is used as a replacement for a compressor. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Next step in the development of the ejector technology for refrigeration is a liquid ejector. Pdf in this paper, simulation program is developed on based of one dimensional mathematical modal to analysis the performance ejector refrigeration. The aim of this paper is to study in detail the irreversibilities in the steam.
Compared with other type of systems, steam jet refrigeration system has many advantages such as structural simplicity, high reliability, easy to. In this study, a novel vaporcompression refrigeration cycle with mechanical subcooling using an ejector is proposed to improve the performance of a conventional singlestage vaporcompression. Jul 16, 2018 how multi ejectors work in c02 refrigeration system. The principal functionality of a common ejector refrigerant cycle is described in the following literature elbel06. In the connection between the evaporator and the ejector the cold vapour may receive some heat in the slhx from point 20 to point 21. An object diagram of the modied ejector refrigeration cycle is shown in gure 1. Referring to the basic ejector refrigeration cycle in figure 1, the system consists of two loops, the power loop and the refrigeration loop. Improved system performance will reduce energy consumption as well as reduce co2 emissions. Ejectors or steam jet coolers use heat rather than electricalmechanical energy to entrain and compress low temperature refrigerant. Modelling of ejector refrigeration system and its application.
Ge, in advances in solar heating and cooling, 2016. The use of the liquid ejector enables the operation of the evaporator in a flooded mode and recirculates the r744 liquid phase, which improves the energy efficiency of the refrigeration. Current advances in ejector modeling, experimentation and. Analysis of a solarassisted ejector cooling system for. When the vaporcompression refrigeration cycle hit the market, it dominated up to present day, sending the erc concept on the backburner of the scientific. Geometric parameter optimization of ejector expansion refrigeration cycle with natural refrigerants article in international journal of energy research 341. Use of an ejector as expansion device is one of the alternative way. This work is part of an effort to develop the ejector expansion refrigeration cycle, a device which increases performance of a standard vapor compression cycle by replacing the throttling valve with a workproducing ejector. Ejector refrigeration an overview sciencedirect topics. Enhancement of co2 refrigeration cycle using an ejector.
For this investigation, the common ejector refrigeration cycle was modied. This suction acts as a pump to circulate the refrigerant in the air conditioning cycle. Geometric parameter optimization of ejector expansion. A cfd model to simulate twophase flow in refrigerant ejectors is described. Us3277660a multiplephase ejector refrigeration system. A recent paper by besagni 11, gives a concise rundown of last twoyear achievements in areas of ejector based refrigeration, power conversion and chemical processes, with future research and development perspectives. In an ejector refrigeration cycle, the ejector and a pump are used instead of a compressor in a vapourcompression system for producing a cooling power. Recently, solar thermal energy emerges as a key research area and introducing it in refrigerator application has happened extremely fast.
In their present state of development they have a much lower cop than vapour compression systems but offer advantages of simplicity and no moving parts. On the basis of the developments and achievements considered for centrifugal compressors and twophase ejectors, a novel water r718 refrigeration cycle with a singlestage centrifugal compressor and twophase ejectors is proposed and characteristics of these new types of compact centrifugal compressorejector water chillers are estimated. Multiplephase ejector refrigeration system download pdf info publication number us3277660a. A kalina cycle is coupled to an ejector refrigeration cycle to generate power and refrigeration outputs, simultaneously. Since steam was widely available at that time, the socalled steam jet refrigeration systems became popular in airconditioning of large buildings and. Solardriven refrigeration systems with focus on the. Ejector refrigeration systems description of technology ejector or jet pump refrigeration is a thermally driven technology that has been used for cooling applications for many years.
International refrigeration and air conditioning conference at purdue, july 1619, 2012 experimental study of an ejector refrigeration system christopher reddick1, yves mercadier2, mohamed ouzzane3 1,2the university of sherbrooke, department of mechanical engineering, 2500, boul. A twostage decompression ejector includes a variable throttle mechanism having a first throttle passage for decompressing a fluid and a valve body for changing a throttle passage area of the first throttle passage, a nozzle having therein a second throttle passage for further decompressing the fluid decompressed by the variable throttle mechanism, and a suction portion for drawing a fluid by. Nowadays, the thermal driven refrigeration system, especially with lowtemperature heat source became more and more popular. Hence, modeling of flow which may be two phase two fluid as in ejector absorber cycle or. Design and analysis of ejector refrigeration system using. Additionally, in order to explore the operating characteristics of merc cycle and exhibits its energy saving potential, comparative research among the modi. The operation of the ejection cycle using lowtemperature heat source can be considered as very attractive and the ejection cycles becomes truly competitive in comparison with the absorption refrigeration systems. A simple solar driven ejector refrigeration system is presented in figure 1. The use of an ejector as a refrigerant expander purdue epubs. Numerical investigation of a refrigeration ejector. Conventional compression refrigeration systems used in automobiles as airconditioning system directly consume high grade mechanical energy of engine. Until now, there are several studies conducted to with different configuration of ejector vapour refrigeration cycle evrc. The major improvement proposed hereby is a second step compression by an ejector device. Today, heating, cooling and refrigeration systems onboard ships are based on mechanical vapour compression.
It is shown that excess heat from naturally hot water in a hot spring resort can still be used for cooling using the ejector refrigeration system. Ejector expansion refrigeration cycles eerc as well as the related. B to c instead of b to c refrigeration cycle with ejector system refrigeration cycle without ejector system. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. The ejector was first developed in 1901 1 for removing air. Background of ejector applications in refrigeration cycles vapor compression refrigeration systems typically utilize expansion valves or other throttling devices to lower the. Paper open access related content applications of jet. Transcritical co refrigeration cycle with ejectorexpansion. International refrigeration and air conditioning conference at purdue, july 1215, 2010 refrigeration cycle with ejector for second step compression mark j. Pdf theoretical analysis of ejector refrigeration system. The ejector expansion refrigeration cycle is a modified vapor compression cycle in which a two phase ejector is used to recover a portion of the work otherwise lost in the expansion valve.
Ejector refrigeration cycle is driven by the heat which is extracted from a hightemperaturepressure stream of kalina cycle working fluid since the energy content of this fluid stream is not directly utilized in power production in the kalina cycle. In this work, a theoretical study has been carried out to assess system and refrigeration efficiencies of a solarassisted ejector cycle using water as the operating fluid. In the power sub cycle, second rate warm, qb, is provided to evaporator or generator to vanish high weight fluid refrigerant process 12. Performance analysis of the ejectorvapor compression. Design and thermodynamic analysis of a steam ejector. From the evaporator, the fluid is brought back to the high pressure section of the system by the ejector. It was found that in terms of the refrigeration cycle, the system performance was always better with r4a than with hfos. Enhanced ejector refrigeration cycles powered by part 1. Refrigeration cycle with ejector system refrigeration cycle without ejector system t emper atur e pr essur e ejector basic cycle enthalpy 1 2 5 6 4 3 a d c a b d c benefits. A refrigeration cycle with ejector is a promising modification to improve the performance of conventional. When heat is freely available, an ejector refrigeration system is a viable alternative to conventional vapor compression cycle. Thermavant has unique expertise and experience in the design, fabrication and testing of thermallypowered ejector based chillers.
Performance comparison of ejector expansion refrigeration. Evaporation is the useful phase of the cycle as in any other refrigeration cycle. Referring to the basic ejector refrigeration cycle in figure 1, the system consists of two loops. Granted application number us11497,032 other versions us7320229b2 en inventor hiroshi oshitani. The advent of new component ejector into refrigeration system opened the new era of research. Ejector airconditioning or refrigeration system powered by lowgrade energy that can be. Performance analysis of ejector refrigeration system with.
Mar 21, 2020 it was found that the total cops for the double ejector cycle are higher by ratios 9. Ejectors in refrigeration an expressor musings on entropy. Thermodynamic analysis of steam ejector refrigeration cycle. Experimental study of an ejector refrigeration system. Pdf a thermodynamic analysis of ejector type vapour. Method of making copper ejectors for a refrigeration system. Exergy analysis of organic rankine cycle with ejector. Jun 10, 20 in the present project, a mathematical model is developed to design an ejector and to study the performance characteristics of a solardriven r22 ejector refrigeration system with a constant. Investigation of vapor ejectors in heat driven ejector refrigeration. Chunyuan zhu tianjin key laboratory of refrigeration technology, school of mechanical engineering. Groll school of mechanical engineering, purdue university, 1077 ray w. The solar driven ejector refrigeration cycle and its performance. Jul 23, 2019 a kalina cycle is coupled to an ejector refrigeration cycle to generate power and refrigeration outputs, simultaneously. Ejectors in refrigeration an expressor posted on august 4, 2015 by mcpletcher 3 comments having developed a degree of confidence with copper brazing, and reaching the potential limits of what can be learned, i have decided to move past my original work with the ebullator.
Design of an ejector cycle refrigeration system request pdf. Performance of ejector refrigeration cycle based on solar. A conventional refrigeration cycle uses expansion device between the condenser and the evaporator which has losses during the expansion process. Combined vapour compressionejector refrigeration system. The subcooled or supercritical expansion ejector cycle fig. Development and performance of an advanced ejector cooling. Nalysis the system considered in this study is an organic rankine cycle combined with an ejector refrigeration cycle and is shown schematically in fig.
In 1910, leblanc introduced a cycle having a vapor jet ejector. The above figure shows the objectives of refrigerators and heat pumps. Ejector refrigeration is one of the most promising technologies because of its relative simplicity and low initial cost. Cers vapor compression ejector refrigeration system eers ejector expansion refrigeration system mers multicomponents ejector refrigeration system ters transcritical ejector refrigeration system greek letters. The main different between the proposed cycle and the current ejector. In this video well be discussing how a multi ejector works in co2 transcritical refrigeration systems. Refrigeration cycle with twophase condensing ejector. The influence of the cycle parameters is analysed on the basis of the first and second law and the results indicated the components with the greater irreversibility.
They concluded that an ejector system is a feasible way of producing refrigeration with a low temperature heat source. How multi ejectors work in c02 refrigeration system. Jan 23, 2020 the refrigerator unit based on electrically driven vapor compression technology consumes high energy, associated with high cost and loss of ecosystem. Efficiency evaluation of the ejector cooling cycle using a.
This configuration represents a totally novel approach for improving the efficiency of the refrigeration cycle by means of twophase liquidvapor ejector. Design of an ejector cycle refrigeration system sciencedirect. Review of ejector design parameters and geometry for. Ejector refrigeration systems description of technology.
Making the case for co refrigeration in warm climates. A thermodynamic analysis on ejector refrigeration cycle erc, have been performed using ecofriendly refrigerants i. Refrigeration cycle with ejector for second step compression. The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. The effects of operating conditions, that is, temperatures and pressures, on ejector cooling cycle. Heymann and resnick 19647 extended the work of mizrahi et al.
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