Ejectors on the cutting edge: The past, the present and the perspective

Besagni, Giorgio

doi:10.1016/j.energy.2018.12.214

Cited by 81 publications

(20 citation statements)

References 65 publications

(69 reference statements)

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“…Therefore, regarding time and costs, a 2D axisymmetric type was utilized in simulations. It is worth noting that a good agreement between simulation results for 2D and 3D modes has been reported in previous studies (Besagni, 2019).…”

Section: Cfd Simulationsupporting

confidence: 87%

A computational‐experimental investigation of thermal vapor compressor as an energy saving tool for the crystallization of sugar in a sugar processing plant

Fanaei

Nikbakht

Hassanpour

2021

J Food Process Engineering

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Energy saving in the food industry is of a great deal of importance. Thermal vapor compressors (TVCs) do not have moving parts which offer advantages including simplicity, low construction capital, and low maintenance costs. In this study, a TVC is designed, and simulated to recover waste vapor streams and reuse the recovered streams in the crystallization of sugar. Computational fluid dynamics is employed to simulate the flows. The effect of motive steam pressure on the entrainment ratio and compressor ratio is simulated. Thermodynamics parameters such as static pressure, temperature, velocity, Mach number, and mass ratios of motive steam and suction are assessed. As the flow is of jet flow type, the realizable k‐e turbulent model is used to model the turbulence. The results show that by applying the motive steam at a pressure of 28 bars (boiler outlet), the pressure and temperature of discharge vapor reach the values of 0.65 bar and 511 K, respectively. The average mass ratios of motive and suction flow at the output of the designed TVC diffuser are 0.59 and 0.41, respectively. As the crystallization pressure demand is 0.6 bar, the findings reveal that the discharged vapor from TVC has sufficient enthalpy to be consumed in the crystallization section, hence making the whole process more efficient. Practical application Equipping the crystallization section of the sugar factory with a thermal vapor compressor, beside the recovery of low‐pressure vapor with motive steam, can reduce energy consumption and play a key role in decreasing fossil pollution. Computational Fluid Dynamics is a validated tool in the simulation of the food processing phenomenon. In terms of TVC optimization, the results obtained from this research serve to designers and process managers to get a detailed perception of energy reduction scenarios and recovery of low enthalpy streams.

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Section: Cfd Simulationsupporting

confidence: 87%

A computational‐experimental investigation of thermal vapor compressor as an energy saving tool for the crystallization of sugar in a sugar processing plant

Fanaei

Nikbakht

Hassanpour

2021

J Food Process Engineering

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“…In this sense, the use of storage technologies, to decouple the demand-side form the supply side, should be further investigated [33]. Unfortunately, the large-scale deployment of ejector-based systems is hindered by the influence of the ejector operation on the performance of the integrated system [34]. To address this, extensive effort towards novel design, optimisation and operation strategies is needed [35].…”

Section: Refrigeration and Air Conditioningmentioning

confidence: 99%

Overview and outlook of research and innovation in energy systems with carbon dioxide as the working fluid

Bianchi

Besagni

Tassou

et al. 2021

Applied Thermal Engineering

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Carbon dioxide (CO 2 , R744) is a natural working fluid with interesting thermophysical properties that have stimulated strong attention by the academic and industrial communities for a broad range of energy applications. The technology readiness level of CO 2 -based energy systems is very diverse due to the increasing consideration that the fluid has been receiving since the 1990s. Hence, the state of the art in CO 2 energy research spans from fundamental thermofluid and chemistry science to commercial system innovations. After a brief compendium on ongoing activities, this paper proposes a roadmap for CO 2 energy research with reference to the cooling, heating and power sectors. The key knowledge gaps and the main challenges at system and component levels are critically discussed. Pathways to advance the understanding and the technological maturity of CO 2 energy systems are also outlined.

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“…This provides motivation to develop a new technology to control the motive nozzle restrictiveness". Despite the wide number of review works on two-phase ejectors (Elbel, 2011;Sarkar, 2012;Sumeru et al, 2012;Chen et al, 2013;Besagni et al, 2016;Elbel and Lawrence, 2016;Tashtoush et al, 2019;Besagni, 2019;Aidoun et al, 2019;Ringstad et al, 2019), their crucial role in steering society towards sustainability (Elbel, 2011;Sarkar, 2012;Sumeru et al, 2012) and the key importance of their capacity control mechanism to achieve this target (Sumeru et al, 2012), no review work is currently available targeting the capacity control mechanism of these devices, to the best of the authors' knowledge. Therefore, the goal of the present investigation is to fill this knowledge gap by thoroughly reviewing the current status on capacity control mechanisms for two-phase ejectors.…”

Section: Introductionmentioning

confidence: 99%

A review on current status of capacity control techniques for two-phase ejectors

Gullo

Kærn

Haida

et al. 2020

International Journal of Refrigeration

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The adoption of highly efficient vapour-compression refrigeration, air conditioning and heat pump (RACHP) systems is compulsory to achieve a low-carbon society. Expansion work recovery using a two-phase ejector is widely recognized as one of the most promising measures to improve the energy efficiency of RACHP units. This holds true for all operation conditions provided that an effective capacity control technique is implemented. In this work a thorough critical review on the current status of the presently available capacity control techniques for two-phase ejectors was carried out. In addition, their pros and cons as well as the comparison of their performance were reported. It was concluded that two-phase ejectors can be properly capacity controlled in large-and medium-scale vapour-compression units. However, a suitable capacity control mechanism for small-scale vapour-compression solutions still requires a major breakthrough and is being intensively discussed among experts in the field.

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Ejectors on the cutting edge: The past, the present and the perspective

Cited by 81 publications

References 65 publications

A computational‐experimental investigation of thermal vapor compressor as an energy saving tool for the crystallization of sugar in a sugar processing plant

A computational‐experimental investigation of thermal vapor compressor as an energy saving tool for the crystallization of sugar in a sugar processing plant

Overview and outlook of research and innovation in energy systems with carbon dioxide as the working fluid

A review on current status of capacity control techniques for two-phase ejectors

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