Review of recent developments in advanced ejector technology

Elbel, Stefan; Lawrence, Neal

doi:10.1016/j.ijrefrig.2015.10.031

Cited by 242 publications

(87 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall efficiency of the compressor is also adjusted as a linear relation with the compression ratio, as detailed by Equation (6), in this case fitted from experimental data of a semi-hermetic compressor [26].…”

Section: Calculation Models and Assumptionsmentioning

confidence: 99%

“…Regarding new components, the CO 2 expander concept is still under maturation, few experimental works were found in the literature, such as the experimental tests with a rotary vane expander of Jia et al [4] and with a two-rolling piston expander of Hu et al [5]. However, great progress was achieved in the last decade regarding the ejector technology; it was already implemented in many plants all over the world, where the energy improvements were experimentally demonstrated [6]. Now, research on ejector technology is focused on achieving adaptable ejectors to all the operation range of the plants, such as the multi-ejector concept of Hafner et al [7] or the adjustable ejector concept of Lawrence and Elbel [8], among others.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

Nebot‐Andrés¹,

Llopis²,

Sánchez³

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

Abstract:A recent trend to spread the use of CO 2 refrigeration cycles in warm regions of the world is to combine a CO 2 cycle with another one using a high performance refrigerant. Two alternatives are being considered: cascade and mechanical subcooling systems. Both respond to a similar configuration of the refrigeration cycle, they being based on the use of two compressors and same number of heat exchangers. However, the compressor, heat exchanger sizes and energy performance differ a lot between them. This work, using experimental relations for CO 2 and R1234yf semi-hermetic compressors analyzes in depth both alternatives under the warm climate of Spain. In general, it was concluded that the CO 2 refrigeration solution with mechanical subcooling would cover all the conditions with high overall energy efficiency, thus it being recommended for further extension of the CO 2 refrigeration applications.

show abstract

Section: Calculation Models and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

Nebot‐Andrés¹,

Llopis²,

Sánchez³

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Ejector refrigeration cycle (EJC) utilizes such low temperature heat energy to generate cooling process [3][4][5]. Several advantages over vapor compression refrigeration systems are for example, no moving parts, little maintenance, long lifespan, and high reliability [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of a Hybrid Compressor and Ejector Refrigeration System for Automotive Air Conditioning Application

Keerlatiyadatanapat¹,

Sriveerakul²,

Suvarnakuta³

et al. 2017

View full text Add to dashboard Cite

Abstract. In this research, performance of a hybrid compressor and ejector refrigeration system for automotive air conditioning application was investigated theoretically and experimentally. Mathematical modeling integrated the 1-dimensional analysis of ejector with the thermodynamic analysis of the hybrid compressor and ejector refrigeration system via EES (Engineering Equation Solver) software was proposed. Also an experimental rig of the hybrid compressor and ejector refrigeration system for automotive air conditioning application was built. This hybrid system has a rated cooling capacity of 3.5 kW. Refrigerant R134a and R141b were used for mechanical vapor compression sub system and the ejector sub system, respectively. The operating conditions are chosen accordingly as, generator temperature between 100 °C and 120 °C, condenser temperature between 30 °C and 40 °C, and evaporator temperature between 0 °C and 10 °C. Theoretical results of the ejector's entrainment ratio (Rm) and COP of the system with variations on operating conditions were compared with the experiment values. From the results, mathematical modeling seems to provide error in COP prediction up to 15.5% when compared with experimental values. Fortunately, modification of the mathematical modeling by applying the computational fluid dynamics (CFD) technique provides less error about 5.5%. It's also found that the COP of the hybrid system can be increased by 10-20% compared to a simple stage ejector refrigeration cycle (EJC). Moreover, estimated power consumption of the automotive air conditioning system can be approximately reduced 20% under the conventional vapor compression cycle.

show abstract

“…The chemical characteristic of carbon-dioxide ensures safety of work for the environment as well as the refrigeration unit staff. A numerous investigations were collected into comprehensive review by Elbel and Lawrence (2016). The described study provides a wide scope of COP increments according to the work recovery as a result of ejector implementation.…”

Section: Introductionmentioning

confidence: 99%

Parallel Work of CO₂ Ejectors Installed in a Multi-Ejector Module of Refrigeration System

Bodys

Palacz

Haida

et al. 2016

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract.A performance analysis on of fixed ejectors installed in a multi-ejector module in a CO2 refrigeration system is presented in this study. The serial and the parallel work of four fixed-geometry units that compose the multi-ejector pack was carried out. The executed numerical simulations were performed with the use of validated Homogeneous Equilibrium Model (HEM). The computational tool ejectorPL for typical transcritical parameters at the motive nozzle were used in all the tests. A wide range of the operating conditions for supermarket applications in three different European climate zones were taken into consideration. The obtained results present the high and stable performance of all the ejectors in the multi-ejector pack.

show abstract

Review of recent developments in advanced ejector technology

Cited by 242 publications

References 44 publications

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

Experimental and Theoretical Investigation of a Hybrid Compressor and Ejector Refrigeration System for Automotive Air Conditioning Application

Parallel Work of CO₂ Ejectors Installed in a Multi-Ejector Module of Refrigeration System

Contact Info

Product

Resources

About

Review of recent developments in advanced ejector technology

Cited by 242 publications

References 44 publications

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis

Experimental and Theoretical Investigation of a Hybrid Compressor and Ejector Refrigeration System for Automotive Air Conditioning Application

Parallel Work of CO2 Ejectors Installed in a Multi-Ejector Module of Refrigeration System

Contact Info

Product

Resources

About

Parallel Work of CO₂ Ejectors Installed in a Multi-Ejector Module of Refrigeration System