Influence of inlet pressure and rotational speed on the performance of high pressure single screw expander prototype

Li, Guoqiang; Lei, Biao; Zhi, Ruiping; Zhao, Ying-Kun; Guo, Zhiyu; Liu, Guangyu; Ma, Chongfang

doi:10.1016/j.energy.2018.01.034

Cited by 24 publications

(9 citation statements)

References 27 publications

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“…The fluid in various states, such as steam at superheated state or at saturated state, gas at high pressure, fluid at gas-liquid two-phase, and heat fluid, can all be used in SSE as its working fluid [22]. The key laboratory where the authors work has rich experience in manufacturing and researching SSE [21][22][23][24][25][26]. Therefore, in this paper based on the feasibility of SSE technology, two redesigned KCS 34g systems in which SSE are used to replace the throttle valves, are proposed for recovering the energy loss due to throttling in the path of ammonialean solution.…”

Section: Introductionmentioning

confidence: 99%

Modification of Kalina cycle system 34g by replacing throttle valve with single-screw expander

Zhang

2022

THERM SCI

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Recovery of the energy loss caused by throttling plays an important role in improving the performance of a cycle. Based on the original Kalina Cycle System 34g, two redesigned cycles, which have different placement of single-screw expanders used to replace the throttle valve, are proposed in this paper. The thermodynamic performance of two redesigned cycles is analyzed and compared with the original Kalina Cycle System 34g. The results show that the thermodynamic performance of each redesigned cycle is better than that of the original Kalina Cycle System 34g and the I?-redesigned cycle performs best. At a low and moderate evaporation pressure, there is an optimal ammonia-water concentration and it increases with the increase of evaporation pressure. With the concentration increases of ammonia-water, the performance advantage of the redesigned cycle system over the original Kalina Cycle System 34g gradually decreases. When the ammonia-water concentration is much lower than the optimal concentration, the single-screw expander produces much work and plays a positive role in net work output of cycle system. The highest cycle exergy efficiency of 54.14% can be obtained in the II-redesigned cycle when the evaporation pressure is 3.0MPa and ammonia-water concentration is 0.85.

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Section: Introductionmentioning

confidence: 99%

Modification of Kalina cycle system 34g by replacing throttle valve with single-screw expander

Zhang

2022

THERM SCI

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“…Recent experimental studies on the SSE have been carried out based on the small-scale organic Rankine cycle system [4][5][6][7][8] and compressed air experimental system [9][10][11], the vast majority of which was analysis on the performance under different working conditions. Wang et al [12] investigated the effect of the pressure loss in the inlet and exhaust passages on the performance of SSEs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study On The Internal Irreversible Flow Loss of Single Screw Expanders

Song

Wei

et al. 2021

Preprint

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As a type of positive displacement expander, single screw expander (SSEs) can be widely applied in the energy storage systems and waste heat recovery field. The irreversible losses (such as leakage, flow, heat transfer, intake and exhaust pressure loss…) have great influence on the expander performance. However, irreversible flow loss in the expander is nearly impossible to investigate experimentally and theoretically. In this paper, a three-dimensional computational fluid dynamics (CFD) study of SSE using mesh deformation approach was presented. The CFD model was validated by the experimental results. Field distribution of pressure, temperature and velocity of SSE were carried out. An energy loss factor based on entropy production principle was used to measure the irreversible flow (including leakage) loss. The energy loss caused by direct dissipation and turbulent fluctuation dissipation was compared. The energy loss of different region was investigated. Results show that energy loss of the turbulent dissipation is far more than that of direct dissipation. The energy loss factor decreases from 0.547 to 0.221 when the rotation speed changes from 2000rpm to 4000rpm. The shaft efficiency increases from 39.8% to 52.1% with the internal volume ratio from 3 to 5.

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“…All these advantages have been attracting many researchers to carry out relevant study on design and application of single screw expander. The authors' research group has conducted a series of research works in the field of single screw expanders [23][24][25][26][27][28][29][30][31]. Normal and novel prototypes of single screw expanders have been experimentally studied [24,26,29].…”

Section: Introductionmentioning

confidence: 99%

“…The authors' research group has conducted a series of research works in the field of single screw expanders [23][24][25][26][27][28][29][30][31]. Normal and novel prototypes of single screw expanders have been experimentally studied [24,26,29]. The factors influencing the performance of a single screw expander have also been studied [26][27][28]30].…”

Section: Introductionmentioning

confidence: 99%

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Zeotropic Mixture Selection for an Organic Rankine Cycle Using a Single Screw Expander

Zhang

et al. 2020

Energies

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The organic Rankine cycle (ORC) is a popular and promising technology that has been widely studied and adopted in renewable and sustainable energy utilization and low-grade waste heat recovery. The use of zeotropic mixtures in ORC has been attracting more and more attention because of the possibility to match the temperature profile of the heat source by non-isothermal phase change, which reduces the irreversibility in the evaporator and the condenser. The selection of working fluid and expander is strongly interconnected. As a novel expander, a single screw expander was selected and used in this paper for efficient utilization of the wet zeotropic mixtures listed in REFPROP 9.1 in a low-temperature subcritical ORC system. Five indicators, namely net work, thermal efficiency, heat exchange load of condenser, temperature glide in evaporator, and temperature glide in condenser, were used to analyze the performance of an ORC system with wet and isentropic zeotropic mixtures as working fluids. The calculation and analysis results indicate that R441A with an expander outlet temperature of 320 K may be the suitable zeotropic mixture used for both open and close type heat source. R436B may be selected with an expander outlet temperature of 315 K. R432A may be selected with an expander outlet temperature from 295 K to 310 K.

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Influence of inlet pressure and rotational speed on the performance of high pressure single screw expander prototype

Cited by 24 publications

References 27 publications

Modification of Kalina cycle system 34g by replacing throttle valve with single-screw expander

Modification of Kalina cycle system 34g by replacing throttle valve with single-screw expander

Numerical Study On The Internal Irreversible Flow Loss of Single Screw Expanders

Zeotropic Mixture Selection for an Organic Rankine Cycle Using a Single Screw Expander

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