Development and experimental study on a single screw expander integrated into an Organic Rankine Cycle

Lei, Biao; Wang, Wei; Ma, Chongfang; Wang, Jingfu; Zhang, Lei; Li, Chuang; Zhao, Ying-Kun; Zhi, Ruiping

doi:10.1016/j.energy.2016.09.089

Cited by 67 publications

(23 citation statements)

References 32 publications

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“…Typically, low temperature harvesters are based on an Organic Rankine Cycle (ORC) [2,3,4,5] which employs refrigerant (e.g. HCFC-123) as a working fluid [6,7,8] in traditional high-speed turbines [9] and crankshaft-based piston expanders [10], and less popular screw [11] and scroll expanders [12]. Most ORC-based harvesters are macroscale systems which benefit from scaling laws that offer high manufacturing tolerances, less heat loss, and less pumping work.…”

Section: Introductionmentioning

confidence: 99%

Design and performance of a miniature free piston expander

Burugupally

Weiss

2019

Energy

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The availability of free thermal energy provide an opportunity for power generation at miniature length scales (millimeter). Though free piston based expanders at macro length scales (centimeter and above) are found to be suitable for heat energy harvesting, their implementation at miniature scales are plagued by significant parasitic losses, yielding low thermal efficiencies. Through physics-based models we investigate the behavior and performance of a miniature free piston expander that operates on an open cycle. Here, we explore the design space of the free piston expander with an objective to achieve an efficiency of at least 15%. Three observations are reported that contribute to higher efficiency operation: (1) a higher injection pressure;(2) an optimum nondimensionalized duration of injection time of 1.5; and (3) softer springs, lower loads, and heavier pistons. A sample calculation showed that a centimeter-sized expander can generate an output power of 2.24 W at 18% efficiency. We observe that both the performance parameters of the expander, namely efficiency and output power are sensitive to injection pressure of the working fluid compared to the time duration of the working fluid injection. Our study reveals that the miniature free piston expander is promising for low temperature waste-heat harvesting.

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Section: Introductionmentioning

confidence: 99%

Design and performance of a miniature free piston expander

Burugupally

Weiss

2019

Energy

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“…It includes turbo type and positive-displacement type. It has been mentioned that turbo type expander that are normally suitable for large scale ORC systems [19,22] but might not be favorable for small scale ORC units [23] and cannot be used as an expander for wet zeotropic mixture applications. If we screen positive-displacement expanders, such as rolling piston expander, scroll expander, and single screw expander, it can be found that the single screw expander is most suitable for wet zeotropic mixture application.…”

Section: Introductionmentioning

confidence: 99%

“…It has the common advantages of positive-displacement expander, such as relatively high efficiency, high pressure ratio, low rotational speed, and tolerance of two-phase fluids [22]. Compared with rolling piston expander and scroll expander, single screw expander has many other advantages, such as balanced load of the screw, long service life, high volumetric efficiency, good performances in partial load, low leakage, low noise, low vibration, and simple configuration [23]. All these advantages have been attracting many researchers to carry out relevant study on design and application of single screw expander.…”

Section: Introductionmentioning

confidence: 99%

“…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 factors influencing the performance of a single screw expander have also been studied [26][27][28]30]. The applications of single screw expanders in ORC and refrigeration systems have also been introduced [23,25,31]. Brief descriptions and analyses of these research works can be found in our previous paper [32].…”

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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Design and Optimization of a Waste Heat Recovery Organic Rankine Cycle System with a Steam–Water Dual Heat Source

Wang

Yuan

2023

Energy Tech

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The organic Rankine cycle (ORC) system in plants, powered by dual steam–water heat sources, has significant power generation potential and practical research value. Herein, the conditions of 700 kPa saturated steam and 650 kPa, 90 °C water heat source are considered. Four configurations of steam–water dual heat source waste heat recovery ORC systems are proposed. The independent parameters affecting the net output power of the system are obtained by developing a mathematical model and optimizing it using the particle swarm optimization method. The results show that the location of the pinch‐point temperature difference in various ORC loops and the allowable working pressure of the heat exchanger are determinants of independent parameters. The net output powers of the conventional dual‐loop ORC (CD‐ORC), single‐loop ORC (S‐ORC), split‐flow dual‐loop ORC (SFD‐ORC), and split‐flow triple‐loop ORC SFT‐ORC systems under the optimal design parameters are 2415.73, 2168.6, 2599.62, and 2716.75 kW, respectively. In addition, S‐ORC has the highest exergy efficiency of 55.17%. SFD‐ORC and SFT‐ORC have ≈48% exergy efficiency, and CD‐ORC has the lowest exergy efficiency of 45.33%.

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Development and experimental study on a single screw expander integrated into an Organic Rankine Cycle

Cited by 67 publications

References 32 publications

Design and performance of a miniature free piston expander

Design and performance of a miniature free piston expander

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

Design and Optimization of a Waste Heat Recovery Organic Rankine Cycle System with a Steam–Water Dual Heat Source

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