Internal volume ratio optimization and performance analysis for single-screw expander in small-scale middle temperature ORC system

Wu, Yuting; Guo, Zhiyu; Lei, Biao; Song, Lili; Zhi, Ruiping

doi:10.1016/j.energy.2019.07.129

Cited by 30 publications

(11 citation statements)

References 39 publications

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“…Optimizing the built-in volume ratio is also important to improve the expander performance by reducing under-expansion or over-expansion losses [148,149]. Wu et al [150] concluded that the optimal built-in volume ratio was not the bigger the better when SSE worked at high pressure ratio condition, because suction pressure loss also increased with the increase of built-in volume ratio. The [104] further presented that adopting slide valves can effectively improve the power output of the SSE and the net power output of the ORC system.…”

Section: Orc Systemmentioning

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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Section: Orc Systemmentioning

confidence: 99%

A Review of Recent Research and Application Progress in Screw Machines

Wang

Liu

et al. 2022

Machines

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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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“…High-pressure gas, superheated steam, saturated steam, gas-liquid two-phase fluid, and heat fluid can all be used as the working fluid in SSE (Wang et al, 2011). The key laboratory where the authors work has conducted a lot of theoretical and experimental researches on the structure of single screw, including the influence of intake pressure (He et al, 2013), gap adjustment (Wang W. et al, 2013), and rotational speed (Li et al, 2018) on the performance of SSE, working fluid selection for ORC using SSE (Zhang et al, 2019), and the performance analysis of an SSE integrated into an ORC (Lei et al, 2016;Wu et al, 2019). In this paper, based on the feasibility of SSE technology, two redesigned KCS 34 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 ammonia-lean solution.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander

Zhang

2021

Front. Energy Res.

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In order to recover the energy loss due to the throttling in the path of ammonia-lean solution in the Kalina Cycle System (KCS) 34, two redesigned cycles, in which single-screw expanders that can perform two-phase expansion are used to replace the throttle valve, are proposed in this paper. The results show that the thermal efficiency and net work of two redesigned cycles are higher than those of the original KCS 34. With the concentration increase of ammonia-water mixture, the work produced by the single-screw expander B in two redesigned cycles gradually decreases, and the difference between the work produced in two redesigned cycles also gradually decreases. The original KCS 34 and two redesigned cycles have high exergy efficiency. The highest cycle exergy efficiency of 56.59% can be obtained in the II-redesigned cycle when the evaporation pressure is 3.0 MPa and ammonia-water concentration is 0.75.

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Internal volume ratio optimization and performance analysis for single-screw expander in small-scale middle temperature ORC system

Cited by 30 publications

References 39 publications

A Review of Recent Research and Application Progress in Screw Machines

A Review of Recent Research and Application Progress in Screw Machines

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

Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander

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