Compressor efficiency with cylinder slenderness ratio of rotary compressor at various compression ratios

A novel rotating piston-type compressor is presented. The conventional rolling piston architecture was redesigned to allow oil-free operation. The spring activated vane was replaced by a directly driven swinging vane to provide constant contact to the rotating piston. The model of the compressor was implemented in the AMESim simulation platform. Experiments were conducted on prototypes and the data were evaluated based on the simulation results. Directly unobservable geometric dimensions were estimated by adjusting the mathematical model parameters to the measured thermodynamic state variables with the use of a multi-parametric genetic algorithm. The simple genetic algorithm proved fast and adequate solutions. According to the collected results, the oil-free rotating piston architecture is significantly more sensitive to the sealing clearances compared to the conventional oil lubricated rolling piston compressors. Therefore, the theoretically estimated performance can only be achieved with extremely small manufacturing tolerances, which has to be maintained during the operation.

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“…Therefore, at higher rotational speed the entrapped mass has less time to escape from the pressurized chamber. 29…”

Section: Resultsmentioning

confidence: 99%

Performance analysis of a novel oil-free rotary compressor

Farkas

Suda

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Other major dimensions, such as slenderness ratio (H/D), which is the ratio of the depth of cylinder to the diameter of cylinder, also affect the mechanical efficiency. Noh et al [4] conducted experiments and numerical analyses to improve compressor efficiency in low speed regions under various pressure conditions. Their results show the effect of cylinder slenderness ratio (H/D) is very sensitive at high compression ratio conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for Flow of Rolling Piston Type of Rotary Compressor

Hsu

Wong

et al. 2020

Energies

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In this numerical study, the temperature, pressure and flow structure inside the rotary compressor are obtained to analyze the work consumption and efficiency. The geometry of the compressor such as volume, inlet angle, and mass of reed valve are varied to look for optimal performance and design margin as the suggestions for manufacturing. The work done on refrigerant increases proportionally with the volume of the compressor. However, there is an optimal volume for efficiency. The design margin for inlet angle is determined. The best efficiency exists in a specific inlet angle. Larger mass of reed valve leads to the increase of input power due to the additional resistance from greater inertia, which causes a decrease of efficiency. The flow visualization by simulation diagnoses the potential factors, which may cause noise problem.

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“…efficiency to nearly 14%[16]. Noh et al examined how cylinder slenderness ratio affects rolling piston compressor performance and discovered that reducing this ratio increased volumetric efficiency by 6.3%, culminating in a total efficiency improvement of 3.7%[17]. Gu et al scrutinized vane tip gap height sensitivity and deduced that as the gap broadens (0.01-0.05 mm), isentropic efficiency declines by 18.26%[18].…”

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confidence: 99%

The Effect of the Isolator Size on the Efficiency of Rotary Piston Compressors

Savvakis,

Damianos,

Zoumpourlos

2023

GEET

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A hybrid renewable-hydrogen green energy system combines renewable energy sources with hydrogen production and storage technologies to create a sustainable and efficient energy system. One of the major components of such systems is compressors, which influence the system’s overall efficiency. Therefore, this research paper will study design modifications that improve the efficiency of these components. More precisely, this study examines the correlation between a concentric rotary piston compressor isolator size and efficiency. The objective is to determine the significance of size on the compressor’s performance. Two distinct mechanisms and operational designs employed in such compressors are investigated. Irrespective of the compressor design, it is revealed that the isolator’s diameter considerably impacts the pressure ratio of these rotary compressors. Specifically, the conclusion is that a larger isolator increases efficiency; a 35% larger RSP diameter results in a 145% increase in peak pressure for Mechanism 1. A 100% larger RSP diameter yields a 180% boost in peak pressure for Mechanism 2.

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Compressor efficiency with cylinder slenderness ratio of rotary compressor at various compression ratios

Cited by 17 publications

References 21 publications

Performance analysis of a novel oil-free rotary compressor

Performance analysis of a novel oil-free rotary compressor

Numerical Simulation for Flow of Rolling Piston Type of Rotary Compressor

The Effect of the Isolator Size on the Efficiency of Rotary Piston Compressors

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