Analysis of the Thermodynamic Characteristics of a Hyper-Compressor through Numerical Simulation and Experimental Investigation

Yang, Lanlan; Jia, Xiaohan; Peng, Xueyuan

doi:10.3390/app13074478

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…7 However, the direct installation of sensors is sometimes restricted by complex geometric structures, ultrahigh pressure and flammable and explosive substances. A non-destructive method based on force-induced strain 8 has been employed as an alternative to monitor the rod load and calculate the dynamic pressure inside the working chamber through piston force analysis. Additionally, the pressure pulsation within pipelines can be calculated based on Hooke’s law and the pressure vessel theory by monitoring the outer surface stress of the pipelines.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Yang,

Zhou,

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The ethylene and vinyl acetate (VA) mixture must be compressed to a high pressure of over 100 MPa in a hyper-compressor system to initiate the polymerization. This paper presents a numerical and experimental investigation into the effects of VA concentration on the performance of a hyper-compressor. To this end, an equation of state in the form of Helmholtz free energy was developed to calculate the real thermodynamic properties of VA–ethylene mixture. The average absolute deviations of density and compressibility factor for VA-ethylene compared with experimental values were 1.82% and 1.46%, respectively. Additionally, a three-dimensional (3D) computational fluid dynamics (CFD) model was constructed considering real-fluid thermodynamics, incorporating the motion of the central valve and upstream and downstream pressure pulsations. The predicted [Formula: see text] diagram and pressure pulsation were compared with experimental data to validate the accuracy of the 3D-CFD model. The results demonstrated that a higher VA weight fraction results in a shorter expansion and compression phase; higher indicated power, suction, and discharge losses; and greater pressure fluctuation. The increment of power loss during the discharge process accounted for 73.27% of the indicated power growth 35.96 kW as the VA weight fraction increased from 0% to 40%. The increment of pressure pulsation in the suction and discharge pipe were mainly attributed to high-frequency pulsations above 10 orders and low-frequency pulsations below 10 orders, respectively.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Yang,

Zhou,

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

show abstract

“…The HP is widely used in heating and cooling systems for buildings and production processes [2], [3], [4]. Energy saving and energy efficiency are achieved through the use of low-quality heat sources (LHP), including RES (wastewater, water bodies, atmospheric air) [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Concentric Heat Pump with Improved Energy Performance

Saule,

Rashit,

Stoyanov

et al. 2023

TEM Journal

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This paper investigates the energy characteristics of the concentric heat pump. The heat exchanger of the evaporator of the "pipe in pipe" type, through the inner copper tube of which the refrigerant circulates, and inside the outer pipe - the coolant, is placed in a spiral around the compressor, cooling it and at the same time absorbing the heat released by it. The new design improves technical and economic performance. Experimental results were carried out, which confirm the possibility of maintaining the compressor temperature (80-90°C), increasing the heat output and conversion coefficient (COP) by an average of 10-15%. The proposed technical solution makes it possible to improve the energy efficiency of the concentric heat pump due to the absorption of the excess heat from the evaporator in the general heat flow and to reduce the emissions of CO2.

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Analyses of gas pulsation characteristics in the discharge pipeline of a hyper compressor

Xiao,

Geng

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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For the analysis of gas pulsation characteristics in the pipeline systems of low density polyethylene (LDPE) hyper compressors, a time-domain calculation method for compressor pipeline gas pulsation based on real gas properties is proposed. First the thermophysical property tables are prepared with gas state parameters as independent and dependent variables. Then one-dimensional unsteady flow equations and characteristic equations for pipeline flow are established based on real gas properties. After setting pipeline parameters and boundary conditions, the flow equations are discretized using a two-step method at the inner points of the pipeline. The characteristic equations are discretized using the trapezoidal integration method at the boundary points. Thus, the time-domain solving of pulsating flow field in the pipeline is realized. A self-developed numerical code was used to conduct the time-domain calculation and analysis of gas pulsation in the discharge pipeline of a two-stage hyper compressor. The calculated pressure pulsation curves based on real gas properties are in good agreement with experimental data, with a maximum difference lower than 4% of the local average pressure, which is smaller than the difference between the results calculated based on the plane wave theory and the measured data. The analysis of gas pulsation characteristics shows that the pressure pulsation in the main pipeline is mainly contributed by the fundamental and second harmonics. The pressure pulsation in the safety valve branch is higher than that in the main pipeline, and the harmonic components falling into the acoustic resonance frequency range of this branch have significant amplitudes. The acoustic resonance frequency of the branch pipeline is not affected by the main pipeline. Pressure pulsation varies with changes in rotational speed and back pressure, and the pulsation level is more significantly affected by rotational speed compared to back pressure. The renovation scheme of connecting the safety valve branch and expansion tube in series can effectively reduce the pressure pulsation levels of the main pipeline and branch pipeline.

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Analysis of the Thermodynamic Characteristics of a Hyper-Compressor through Numerical Simulation and Experimental Investigation

Cited by 4 publications

References 28 publications

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Performance analysis of a hyper-compressor for vinyl acetate and ethylene mixture using real-fluid properties

Investigation of the Concentric Heat Pump with Improved Energy Performance

Analyses of gas pulsation characteristics in the discharge pipeline of a hyper compressor

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