High-pressure water as the driving fluid in an ejector refrigeration system

Butterworth, M.D.; Sheer, T. J.

doi:10.1016/j.applthermaleng.2005.07.011

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…In the pulsed movement of the piston ("water plug"), the kinetic energy is directly converted into the compressed gas. In other words, Flügel-Cunningham's mechanism assumes that the process of mixing in a liquid-gas ejector involves simultaneous compression and acceleration of the compressed gas stream so that single bubbles are driven into the drive liquid region [121]. In addition, this model is the most similar to the mechanisms caused by steam condensation and it is necessary to take into account the phenomena associated with diffusion and phase transitions caused by external and internal configuring forces, i.e., D + P, respectively [109][110][111].…”

Section: Mixing and Condensation Process For The Spray-ejector Condensermentioning

confidence: 99%

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

et al. 2022

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Reduction of greenhouse gases emissions is a key challenge for the power generation industry, requiring the implementation of new designs and methods of electricity generation. This article presents a design solution for a novel thermodynamic cycle with two new devices—namely, a wet combustion chamber and a spray-ejector condenser. In the proposed cycle, high temperature occurs in the combustion chamber because of fuel combustion by pure oxygen. As a consequence of the chemical reaction and open water cooling, a mixture of H2O and CO2 is produced. The resulting working medium expands in one turbine that combines the advantages of gas turbines (high turbine inlet temperatures) and steam turbines (full expansion to vacuum). Moreover, the main purpose of the spray-ejector condenser is the simultaneous condensation of water vapour and compression of CO2 from condensing pressure to about 1 bar. The efficiency of the proposed cycle has been estimated at 37.78%. COM-GAS software has been used for computational flow mechanics simulations. The calculation considers the drop in efficiency due to air separation unit, carbon capture, and spray-ejector condenser processes. The advantage of the proposed cycle is its compactness that can be achieved by replacing the largest equipment in the steam unit. The authors make reference to a steam generator, a conventional steam condenser, and the steam-gas turbine. Instead of classical heat exchanger equipment, the authors propose non-standard devices, such as a wet combustion chamber and spray-ejector condenser.

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Section: Mixing and Condensation Process For The Spray-ejector Condensermentioning

confidence: 99%

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

et al. 2022

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“…The outlet flow chamber serves to mimic a process vessel or drain tank, such as that found in Butterworth and Sheer. 28 It also serves to direct the outgoing flow into a jet collector within the acoustic chamber.…”

Section: Ejector Geometrymentioning

confidence: 99%

An experimental investigation of the use of an outlet silencer to quiet ejectors

Desmarais

Rocha

2020

International Journal of Aeroacoustics

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Ejectors are simple fluid movers and mixers used in a range of industries; however, the attractiveness of their simplicity can be offset by high levels of noise generation. This work experimentally investigates the use of a silencer affixed to the outlet of a subsonic air–air ejector as a means of quieting the ejector. An emphasis is placed on finding a silencer design which has a minimal impact on the mass flow rate exhausting from the ejector (pumping performance). This paper discusses the results of 10 different silencer designs, tested in an attempt to further understand noise generation mechanisms and to find a practical method to reduce the noise of ejectors. It is found that the placement of a perforated cone at the mid-length of the silencer is the only solution tested which provides a significant acoustic advantage with only a small drop in pumping performance. Other solutions tested provide either no acoustic advantage or have too great of a reduction in pumping performance. It is found that the size and shape of the ejector can be designed in such a way to reduce the overlap of natural modes and thus the overall noise levels of the ejector caused by high levels of resonance. The use of acoustic foam to dampen acoustic natural modes proves that the natural modes of the ejector are a significant contributor to the overall noise levels.

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“…The extensive data are available in literature on the characteristics, calculation techniques, application spheres, design and arrangement of processes in vapor-jet apparatuses and vacuum-generating apparatuses [4,5]. But only scarce information can be found on application of jet apparatuses to high-pressure gas pumping.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of liquid-jet high-pressure booster compressors

Михеев

Davletshin

Mikheev

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. There are almost no experimental data on the head-capacity curves for liquid-jet compressors with the inlet gas pressure of liquid-jet apparatus more than 1 MPa. Meanwhile, this range is important for many engineering applications in which relatively low compressor ratio is required for the pumping of gas under high pressure. This is mostly the case when gas circulation is to be provided in a closed or almost closed circuit. A head-capacity curve of a liquid-jet apparatus has been estimated experimentally for the air pumping at up to 2.5 MPa by a water jet. To obtain this curve, a new original technique has been submitted and verified which is based on an inverse unsteady problem of gas pumping and allows derivation of the whole curve instead of one operating point, which is the case for conventional methods. The experiments have demonstrated that the relative head of the liquid-jet compressor grows with the apparatus inlet air pressure in the middle part of the curve.

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High-pressure water as the driving fluid in an ejector refrigeration system

Cited by 13 publications

References 2 publications

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

An experimental investigation of the use of an outlet silencer to quiet ejectors

Efficiency of liquid-jet high-pressure booster compressors

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