A review of scroll expander geometries and their performance

Emhardt, Simon; Tian, Guohong; Chew, John W.

doi:10.1016/j.applthermaleng.2018.06.045

Cited by 58 publications

(31 citation statements)

References 78 publications

(84 reference statements)

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“…The higher number of scroll turns resulted in increased losses due to friction and internal leakages. A comprehensive review of scroll expander geometries and their impact on the performance was also provided by the authors [14].…”

Section: Introductionmentioning

confidence: 99%

“…However, variable wall thickness scroll expanders are not widely investigated and the effect on the expansion process is almost unknown since the research and development of these innovative expander designs is still in the early stages. No experimental research is available and all the literature can be narrowed down to theoretical studies [14].…”

Section: Introductionmentioning

confidence: 99%

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CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

Emhardt

Tian

Song

et al. 2020

Energy

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

Emhardt

Tian

Song

et al. 2020

Energy

Self Cite

View full text Add to dashboard Cite

“…It is worth noting here that research and development works on novel variable expansion ratio volumetric expanders are ongoing. The examples are scroll machines with injection ports [22][23][24], piston devices with controlled valves [25], and screw machines with sliding ports [26][27][28]. In contrast to turbo expanders, volumetric machines are able to operate under poor operating conditions (i.e., low working fluid flow rates and low pressures).…”

Section: Introductionmentioning

confidence: 99%

The Method of the Working Fluid Selection for Organic Rankine Cycle (ORC) Systems Employing Volumetric Expanders

Kolasiński

2020

Energies

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The working fluid selection is one of the most important issues faced when designing Organic Rankine Cycle (ORC) systems. The choice of working fluid is dictated by different criteria. The most important of them are safety of use, impact on the environment, and physical and chemical parameters. The type of ORC system in which the working fluid is to be used and the type of expander applied in this system is also affecting the working fluid selection. Nowadays, volumetric expanders are increasingly used in ORC systems. In the case of volumetric expanders, in addition to the aforementioned working fluid selection criteria, additional parameters are considered during the selecting of the working fluid, such as the range of operating pressures and geometric dimensions (determining the volume of working chambers) affecting the achieved power and efficiency of the expander. This article presents a method of selecting a working medium for ORC systems using volumetric expanders. This method is based on the dimensionless rating parameters applied for the comparative analysis of different working fluids. Dimensionless parameters were defined for selected thermal properties of the working fluids, namely thermal capacity, mean temperature of evaporation, mean temperature of condensation, pressure and volumetric expansion ratio, volumetric expandability, as well as the heat of preheating, vaporization, superheating, cooling, and liquefaction. Moreover, isentropic expansion work was considered as the rating parameter. In this article, in addition to the working fluid selection method, computational examples related to the selection of the working fluid for the ORC system fed by a heat source featuring specified temperatures are presented. The results of calculations of rating parameters and their comparison gave an outlook on the selection of appropriate working fluids.

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“…In the last decade, scroll compressors and other positive displacement machines (PDMs, e.g., piston, screw, and vane machines) have been operated as expanders in Organic Rankine Cycles (ORCs) to generate power from waste heat and renewable energies [1]. Compared to its alternatives, the scroll expander is generally characterized by higher pressure ratios and efficiency and by lower flow rates and rotational speeds [2]. On the other hand, one of the major drawbacks of this technology is the maximum working temperature (maximum temperature of 250 • C reported by Seher et al [3]): higher temperatures would increase excessively the thermal expansion of scroll spirals, leading to significant increments of internal leakages [4].…”

Section: Introductionmentioning

confidence: 99%

Structured Mesh Generation and Numerical Analysis of a Scroll Expander in an Open-Source Environment

et al. 2020

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The spread of the organic rankine cycle applications has driven researchers and companies to focus on the improvement of their performance. In small to medium-sized plants, the expander is the component that has typically attracted the most attention. One of the most used types of machine in this scenario is the scroll. Among the other methods, numerical analyses have been increasingly exploited for the investigation of the machine’s behaviour. Nonetheless, there are major challenges for the successful application of computational fluid dynamics (CFD) to scrolls. Specifically, the dynamic mesh treatment required to capture the movement of working chambers and the nature of the expanding fluids require special care. In this work, a mesh generator for scroll machines is presented. Given few inputs, the software described provides the mesh and the nodal positions required for the evolution of the motion in a predefined mesh motion approach. The mesh generator is developed ad hoc for the coupling with the open-source CFD suite OpenFOAM. A full analysis is then carried out on a reverse-engineered commercial machine, including the refrigerant properties calculations via CoolProp. It is demonstrated that the proposed methodology allows for a fast simulation and achieves a good agreement with respect to former analyses.

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A review of scroll expander geometries and their performance

Cited by 58 publications

References 78 publications

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

The Method of the Working Fluid Selection for Organic Rankine Cycle (ORC) Systems Employing Volumetric Expanders

Structured Mesh Generation and Numerical Analysis of a Scroll Expander in an Open-Source Environment

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