Analysis of the possibility of using R718 for a heat pump of a heating system based on a liquid-vapor ejector

Sharapov, Serhii; Husiev, Danylo; Панченко, Віталій Олександрович; Козін, Віктор Миколайович; Baha, Vadym

doi:10.15587/1729-4061.2020.217274

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The authors of [9] propose to use a liquid-vapor ejector as part of a vacuum unit operating on the principle of jet thermocompression. This principle implies that the working jet of steam is formed directly in the nozzle of the active flow and does not require an additional source of boiler steam, as for steam-jet ejectors.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Sharapov

Yevtushenko

Панченко

et al. 2022

EEJET

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This paper considers the possibility of using liquid-vapor ejectors in condensing units of steam turbines. This unit is designed for pumping out a steam-air mixture from a steam turbine condenser, in which the process occurs at a pressure lower than atmospheric. In the traditional scheme, this is provided by a two-stage steam-jet ejector unit. The proposed scheme involves the use of a single-stage liquid-vapor ejector and its possible pre-vacuum mode of operation in conjunction with a liquid-ring vacuum pump. A working process of the liquid-vapor ejector does not require the supply of working steam from the outside since its generation occurs in the active nozzle of the liquid-vapor ejector. A description of the traditional scheme and the proposed options is given, which are different both in the scheme solution and in the operating parameters. The object of this study is a liquid-vapor ejector, which is used in the condensing system of a steam turbine. Thermodynamic calculation of the proposed circuit solutions was carried out. As a result, the necessary mode parameters of the schemes were determined. To assess the feasibility of using a liquid-vapor ejector in the condensation systems of steam turbines, an exergy analysis was performed. The proposed scheme makes it possible to increase efficiency by 2.3 times, and when used with a liquid-ring vacuum pump – by 2.44 times. To assess the economic efficiency of the modernization of the condensing system, thermoeconomic analysis was performed. The use of the proposed scheme makes it possible to reduce the cost of generating boiler steam and reduce the cost of the resulting product of the steam turbine unit by about 51 %. The estimated cost of a unit of the amount of boiler steam consumed per ton of product and the unit cost of steam were established.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Sharapov

Yevtushenko

Панченко

et al. 2022

EEJET

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“…In addition, an approach for multidimensional modeling two-phase ejector flow was proposed in [7]. An analysis of the possibility of using water as a refrigerant for a heat pump based on a liquid-vapor ejector was provided in [8].…”

Section: Introductionmentioning

confidence: 99%

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

et al. 2022

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The article investigated the flow of boiling streams through a nozzle with an oblique cut. Due to this flow organization, deviation from the nozzle axis at the vortex chamber inlet occurred. The study of flow modeling in the inlet section was carried out. The flow design and the calculation scheme of the vortex liquid–steam jet apparatus were proposed. Analytical expressions between the main operating parameters were obtained according to the developed mathematical model. A recommended oblique-cut angle for the active-flow nozzle was evaluated considering the transition through the first critical section based on the tangential velocity flow model. Validation of the mathematical model in the inlet section of the vortex chamber was provided based on the comparison with available experimental data. Flow visualization in the inlet section of the vortex chamber was obtained. The assumption of uneven flow distribution was confirmed experimentally. Overall, the boiling liquid flow was implemented in the active flow nozzle. The obtained scientific and practical results help to determine geometric parameters and physical characteristics of the vortex-type liquid–steam jet apparatus at the design stage. The obtained results were implemented to modernize vacuum units based on vortex type liquid–steam jet apparatuses.

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Increasing Boiling Fluid Flowing Efficiency from Motive Nozzles of Two-Phase Ejectors

Sharapov

Chekh

Husiev

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The article contains the possibility of increasing boiling fluid flowing efficiency from expanding channels. This process takes place in the motive flow nozzle of a liquid-vapor ejector, working on the principle of thermal stream compression. Efficiency increasing by profiling the diffuser part of the nozzle. Modern industry uses nozzles, which are like de Laval nozzles, with straight walls of the diffusers. The authors suggest paying closer attention to profiling these nozzles, which might increase their efficiency and improve their gas-dynamic characteristics. For comparison, we choose a channel of a traditional form (with straight walls of the diffuser) and a channel of parabolic shape. The article contains a mathematical model to calculate the process of flowing the boiling fluid from the authors-designed channels – the peculiarities of this model that appear after changing the geometry of its streaming part. We obtain comparative analysis calculation results based on the mathematical model and the Ansys CFX workflow model. As a result of numerical calculation using the authors mathematical model and modelling in the Ansys CFX software package, it concludes that the parabolic shape of the diffuser is the most favourable. In the boiling process, the liquid central core is boiling at the optimum distance from the nozzle throat, and the flow of a stable vapor structure with the required pressure value for each regime forming at the outlet.

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Analysis of the possibility of using R718 for a heat pump of a heating system based on a liquid-vapor ejector

Cited by 5 publications

References 3 publications

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

Increasing Boiling Fluid Flowing Efficiency from Motive Nozzles of Two-Phase Ejectors

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