Research on Effects of Vapor Injection on Twin-screw Compressor Performance

Wu, Haowei; Lin, Kanlong; Huang, Hao; Xiong, Baoshun; Zhang, Beiyu; Xing, Ziwen

doi:10.1016/j.ijrefrig.2020.04.023

Cited by 26 publications

(9 citation statements)

References 23 publications

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“…Specifically, the 1 A′ parameter is related to the logarithmic part of Equation. (13) and is two orders of magnitude lower than the 0 A′ , which represents the constant part of the correlation with a value similar to the constant friction factor (K).…”

Section: Vapour Injection Semi-empirical Model Verification With R407cmentioning

confidence: 91%

“…As a result, the initial constant friction factor is replaced with the expression of Equation. (13), introducing an additional parameter to the model, and leading to 13 parameters in total. The verification of this approach will be presented in a next section.…”

Section: A Log 28257 Rementioning

confidence: 99%

“…(6), the refrigerant mass flow rate is identified at this time by applying an energy balance at the evaporator, similar to Εquation. (13). Moreover, by using the continuity equation (Equation .(3)) and once the evaporator and condenser mass flow rates are determined, the vapour injection mass flow is then calculated.…”

Section: Data Reductionmentioning

confidence: 99%

See 2 more Smart Citations

Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

Meramveliotakis¹,

Kosmadakis²,

Karellas³

2022

Open Res Europe

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This work investigates a vapour injection scroll compressor integrated in a heat pump using the refrigerant R1234ze(E). The water-to-water heat pump was tested under a wide temperature range at the evaporator and condenser sides. The test results revealed that the performance is significantly reduced for lifts of over 30 K with the coefficient of performance being even below 2 and the maximum 2nd law efficiency was just 28%. In order to enlighten the reasons behind such significant compressor underperformance, a semi-empirical model has been extended to include vapour injection, and a new improved modelling approach for the suction pressure drop was developed and implemented considering both the turbulent and laminar inlet flow regimes. Once the accuracy of the developed semi-empirical model was verified, the model was then adjusted to account for the R1234ze(E) operation, by fine-tuning its parameters based on the test data. The main loss mechanism identified is the high suction pressure drop, due to the high friction factor, with the inlet refrigerant flow possibly being laminar instead of turbulent. This resulted in a significant reduction of the mass flow rate and volumetric efficiency, while the standard model for suction pressure drop was not able to capture this effect.

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Section: Vapour Injection Semi-empirical Model Verification With R407cmentioning

confidence: 91%

Section: A Log 28257 Rementioning

confidence: 99%

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Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

Meramveliotakis¹,

Kosmadakis²,

Karellas³

2022

Open Res Europe

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“…The special rotor grid generator for rotary positive displacement machines, TwinMesh, also purposely contains the module for twin-screw machines, but can only be used in the CFD solver, ANSYS CFX. As a case, Wu et al [73,74] applied the TwinMesh to generate the rotor grid for a refrigeration TSC. Additionally, some common commercial software, such as Gambit [75] and STAR-CCM+ [76], can also be used to generate dynamic grids for twin-screw machines, but are hardly used owing to the inconvenience.…”

Section: Cfd Modelmentioning

confidence: 99%

A Review of Recent Research and Application Progress in Screw Machines

Wang

Liu

et al. 2022

Machines

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Screw machines, mainly including single-screw type and twin-screw type, have gone through significant development and improvement during the past decade. This paper reviews the relevant studies available in the open literature for acquiring insight into and to establish the state of the art of the research and application status of screw machines. The related research on different aspects, which would affect the performance and reliability of screw machines includes rotor profile and geometric characteristics, thermodynamic modelling, vibration and noise, lubrication and wear, control of capacity and built-in volume ratio, and liquid injection technology. In the aspect of thermodynamic modelling, the available methods, i.e., empirical or semi-empirical model, lump model, and 3D CFD model, adopted for the performance prediction and optimal design of screw machines are summarized. Then, the review covers the application status of screw machines in the fields of air compression and expansion, refrigeration and heat pump, organic Rankine cycle (ORC), and other popular applications, with an emphasis on the reported performance and progress in technologies of screw machines. Finally, conclusions and perspectives for future research in the area of screw machines are presented. The review provides readers with a good understanding of the research focus and progress in the field of screw machines.

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“…In order to visualize the distribution and the variation of temperature, pressure and streamlines during compression and obtain reasonable results, different types of compressors were analyzed with CFD method. [8][9][10] Farkas 11 studied the compression process of a rotary compressor using the unstructured grid and the structured grid respectively, and compared the two models. The simulation results are in good agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Investigation of suction pressure pulsation prediction of rotary compressor with total variation diminishing scheme and one-dimensional accumulator model

Zhang

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The suction pressure pulsation plays a significant role in rotary compressor performance, so employing gas dynamic model for simulation is critical for compressor performance prediction and structure design. Comparing with the conventional Lax-wendroff two-step (LW2) scheme which has been usually utilized with good behaviors of speed and stability, this paper adopted the total variation diminishing scheme with higher convergence speed and less dispersion. And the common zero-dimensional model for the accumulator is updated to a one-dimensional model achieving more accurate pressure results at the suction pipe inlet. The simulation results of instantaneous pressure are also compared with experimental measured data under different conditions. The Pearson Correlation Coefficient of simulated pressure curves are all higher than 0.9 and the relative errors of predicted performance are almost all less than 5%, which indicates better agreement on pressure pulsation simulation and performance prediction.

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Research on Effects of Vapor Injection on Twin-screw Compressor Performance

Cited by 26 publications

References 23 publications

Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

Identifying the performance and losses of a scroll compressor with vapour injection and R1234ze(E)

A Review of Recent Research and Application Progress in Screw Machines

Investigation of suction pressure pulsation prediction of rotary compressor with total variation diminishing scheme and one-dimensional accumulator model

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