One-Dimensional Modelling of a Trilateral Flash Cycle System with Two-Phase Twin-Screw Expanders for Industrial Low-Grade Heat to Power Conversion

Bianchi, Giuseppe; Marchionni, Matteo; Kennedy, Stuart; Miller, Jeremy; Tassou, S.A.

doi:10.3390/designs3030041

Cited by 3 publications

(1 citation statement)

References 17 publications

(24 reference statements)

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“…to name a few. In the realm of twin screw machines, single and multi-phase screw expanders have been modeled and validated with GT-SUITE [6,7]. However, to the authors' knowledge, this is the first study modeling the thermodynamics in a twin screw pump with the GT-SUITE solver.…”

Section: D Thermodynamic Chamber Modelmentioning

confidence: 99%

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Ramchandran¹,

Rane²,

Kovačević³

et al. 2022

SAE Int. J. Passeng. Veh. Syst.

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Electrification has become less of a catchphrase and increasingly commonplace when discussing today's locomotives. Engineers developing thermal management strategies (both component suppliers and system-level analysts) must be armed with effective tools to design and analyze essential components such as coolant pumps and study their behavior in an actual system. This study focuses on the analysis of twin screw pumps for cooling battery packs in hybrid and battery electric vehicles via three different approaches -experimental measurements, a one-dimensional (1D) thermodynamic chamber model, and a three-dimensional (3D) computational fluid dynamics (CFD) model. Experimental measurements are conducted to quantify the coolant's volume flow rate and the shaft power consumption over a range of operating speeds and pump discharge pressures. While these measurements provide some insight into the overall internal leakages and pumping efficiencies, more comprehensive tests at a higher cost are required to fully understand the detailed thermodynamic processes occurring within the pump. Two computational modeling approaches are presented and extensively validated against these measurements. The 1D chamber model demonstrates a good agreement of all measured quantities at a very low computational cost. It also provides useful information regarding the relative importance of the various leakage paths along with the working processes and pressure pulsations. This makes it an effective tool to quickly analyze operating conditions where test data may not be available and iterate towards improved designs via parametric analysis. 3D CFD yields very good agreement compared to the measured results and provides a more complete picture with greater spatial accuracy that is sacrificed in the 1D approach. However, this is available at a significantly higher computational cost. A combination of both methodologies can guide engineers in designing screw pumps for optimal performance.

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Section: D Thermodynamic Chamber Modelmentioning

confidence: 99%

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Ramchandran¹,

Rane²,

Kovačević³

et al. 2022

SAE Int. J. Passeng. Veh. Syst.

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Numerical investigations of an opposed rotary piston expander for the purpose of the applications to a small-scale Rankine cycle

Gao

Tian

et al. 2021

Applied Thermal Engineering

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A Thermodynamic Chamber Modelling Approach for Oil Free and Oil Injected Twin Screw Compressors

Ramchandran

Harrison

2021

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

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As computational modelling becomes an increasingly reliable and key component in accelerating the design process for twin screw machines, the goals for engineers now include developing faster running and physically accurate component models to optimize machine performance and efficiency, minimize internal leakage, reduce unwanted noise and pulsations, and properly size bearing supports in the machine. Accurately capturing these aspects via physical models helps in analyzing operating points that were not tested as well as in understanding how the machine will perform in a surrounding system. Thereafter, engineers can find an optimal design in a timely manner for the fastest speed to market as well as reduce physical testing to keep development costs low. This paper presents the use of a multi-physics modelling platform - GT-SUITE - in conjunction with SCORG – a well-established tool for the design and analysis of twin screw machines – to explore meeting the aforementioned goals. Two case studies are presented for a 3/5 oil free air compressor and a 4/5 oil injected air compressor. Comparisons to the mass flow rates of the gas and oil, temperatures, indicated power and the instantaneous chamber pressure vs rotation angle were made against test data available from the Centre for Compressor Technology at City University. The sensitivity of oil injection timing on the discharge temperature and power is shown and an optimum timing was found. The validated chamber models may be integrated into a system as well as used for further optimization to improve the original compressor performance.

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One-Dimensional Modelling of a Trilateral Flash Cycle System with Two-Phase Twin-Screw Expanders for Industrial Low-Grade Heat to Power Conversion

Cited by 3 publications

References 17 publications

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Numerical investigations of an opposed rotary piston expander for the purpose of the applications to a small-scale Rankine cycle

A Thermodynamic Chamber Modelling Approach for Oil Free and Oil Injected Twin Screw Compressors

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