Numerical investigation on vapor-liquid two-phase compression in the cylinder of rotary compressors

Lin, Jie; Lian, Yongsheng; Wu, Jiang

doi:10.1016/j.applthermaleng.2020.115022

Cited by 20 publications

(6 citation statements)

References 14 publications

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“…10 ). Both variations of the pressure and the liquid mass flow rate have two peaks, which is consistent with the experimental results in the literature 11 . In general, even with high initial liquid volume fraction, the maximum pressure in the cylinder during liquid compression process for the rotary is small and does not exceed 3 times the discharge pressure.…”

Section: Resultssupporting

confidence: 91%

“…10). Both variations of the pressure and the liquid mass flow rate have two peaks, which is consistent with the experimental results in the literature 11 .…”

Section: Effect Of Initial Liquid Volume Fraction On Two-phase Compre...supporting

confidence: 91%

“…Because the homogeneous flow model can’t well predict the peak pressure in cylinder during liquid compression process. Lin 11 proposed a novel two-phase mathematic model, which considers refrigerant phase change, kinetic energy and heat exchange between refrigerant and the wall, to predict the pressure jump in the cylinder under liquid compression conditions. Effects of rotation speed initial, gas fraction and refrigerant type on the liquid compression were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Simulation on two-phase refrigerant compression in the cylinder of rotary compressors using CFD method

Guo,

Lin,

2024

Sci Rep

Self Cite

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The two-phase compression process in the rotary compressor often occurs, such as defrosting and startup processes, which has a significant impact on the performance and reliability of air conditioning systems. In this paper, the CFD simulations predicting the two-phase refrigerant compression process in the compressor cylinder are conducted using the commercial software ANSYS Fluent. The dynamic mesh for the fluid domain and phase change model for the refrigerant are considered in the simulation. Effects of initial liquid volume fraction, refrigerant type and compressor type on the two-phase compression characteristics using R290 as refrigerant are carried out. Variations of the pressure, temperature, gas fraction distribution and evaporation rate in the cylinder are discussed. The results show that most liquid accumulates near the leakage gap and the bottom of the compression chamber during the two-phase compression process. The peak pressure during the two-phase compression decreases with the increase of the liquid volume fraction. The evaporation rate of R32 in the cylinder is much higher than that of R290. The maximum pressure of the reciprocating compressor is 2.26 times higher than that of the rotary compressor.

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Section: Resultssupporting

confidence: 91%

“…10). Both variations of the pressure and the liquid mass flow rate have two peaks, which is consistent with the experimental results in the literature 11 .…”

Section: Effect Of Initial Liquid Volume Fraction On Two-phase Compre...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulation on two-phase refrigerant compression in the cylinder of rotary compressors using CFD method

Guo,

Lin,

2024

Sci Rep

Self Cite

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“…Amongst the replacement refrigerants with low GWP, R290 was found to have the best performance [182] and in an investigation on two-phase compression in the event of liquid slugging [183], R290 also had the least detrimental effect on the compressor due to the large difference in its specific volume between the liquid and vapor phases. Extensive research on the performance of the rolling piston compressor with R290 was thus carried out, which included transient start-up investigations [93,94], and effects of component deformation [103] in lieu of the associated higher operating pressures.…”

Section: Refrigerantsmentioning

confidence: 99%

A Review on Sliding Vane and Rolling Piston Compressors

Ooi

2021

Machines

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Rotary compressors have been employed in heating and cooling for more than a century and are ubiquitous in daily life but there has not been any comprehensive record of their development and technological advances. This review paper attempts to provide a comprehensive account of the advances in R&D and design evolution of these rotary compressors since their inception, namely the sliding vane compressor, rolling piston compressor, and their design variants in open literature. This is to showcase the current state-of-the-art for these compressors so that researchers can use it as a basis for future work. Based on authors’ insight, inter-disciplinary research combined with advancements in ‘disruptive’ technology such as artificial intelligence and advancements in additive manufacturing might be a promising research direction to bring about improvements in rotary compressor performance to meet mankind’s growing needs for cooling and heating applications.

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“…20 At high IVFR, the fluid inhaled into the suction chamber contained liquid droplets that would enhance the heat transfer between the fluid and chamber walls. Nevertheless, as the quality of the two-phase fluid was close to 1 and the two-phase fluid was assumed to be homogeneous, the single-phase heat transfer coefficients between refrigerant and chamber walls 20,22,23 were adopted in our heat transfer model. The two-phase mixture properties were used for calculating the heat transfer coefficients.…”

Section: Mathematic Modelmentioning

confidence: 99%

Influence of two-phase suction injection on performances of the scroll refrigeration compressor with a high-temperature shell

Sun

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The two-phase suction injection can reduce the discharge temperature of scroll refrigeration compressors, which work under a high-pressure ratio. The heat transfer along the pipe axis from the shell affects the two-phase suction injection significantly for the compressor with a high-temperature shell. In this paper, the suction mixing and heat transfer model was developed to calculate the heat transfer along the pipe axis from the high-temperature compressor shell. Then the model was coupled with the two-phase compressor model to obtain the compressor performance under different suction injection volume flow rates. The compressor with two-phase suction injection was tested under different injection volume flow rates to validate the model. The results indicated that the discharge temperature decreased by 2 °C when the mass injection ratio increased by 1%. As the injection volume flow rates increased, the total mass flow rate increased due to the reduction of the specific volume of the suction fluid; the input work decreased because of the reduction of specific work and the improvement of the motor's electric efficiency. The cooling capacity decreased since the cooling capacity of the injection refrigerant was wasted for cooling the suction process and the compressor shell, especially at high injection volume flow rates. The coefficient of performance reached the maximum value at the injection volume flow rate of 0.015 m3·h−1 and became lower than the coefficient of performance without injection when the injection volume flow rate raised to 0.035 m3·h−1. Hence, the two-phase suction injection can reduce the discharge temperature efficiently at low injection volume flow rates with a slight improvement of coefficient of performance.

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Numerical investigation on vapor-liquid two-phase compression in the cylinder of rotary compressors

Cited by 20 publications

References 14 publications

Simulation on two-phase refrigerant compression in the cylinder of rotary compressors using CFD method

Simulation on two-phase refrigerant compression in the cylinder of rotary compressors using CFD method

A Review on Sliding Vane and Rolling Piston Compressors

Influence of two-phase suction injection on performances of the scroll refrigeration compressor with a high-temperature shell

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