Experimental modeling of a lubricated, open drive scroll expander for micro-scale organic Rankine cycle systems

Moradi, Ramin; Villarini, Mauro; Cioccolanti, Luca

doi:10.1016/j.applthermaleng.2021.116784

Cited by 21 publications

(9 citation statements)

References 49 publications

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“…The results showed that a volumetric efficiency of approximately 80% was achieved and this value was not influenced by rotational speed. Kohsokabe et al [55] built a scroll expander prototype with a volume ratio of 2 and an inlet volume of 2800mm 3 .…”

Section: Scroll Expandermentioning

confidence: 99%

“…Organic Rankine cycle (ORC) is a popular thermodynamic power cycle to recover low-tomedium heat resources. Compared with the traditional Rankine steam power cycle, the organic working fluids evaporate at lower temperatures and condensate at positive gauge pressures at ambient temperatures [3]. Although ORC becomes a mature and reliable technology for medium-large scale (~10MW) power cycles, at small/micro scale the technology still faces challenges such as poor reliability and relatively low efficiency.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

Tian

Pekris

2022

Applied Thermal Engineering

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Section: Scroll Expandermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

Tian

Pekris

2022

Applied Thermal Engineering

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“…Ramin Moradi et al 18 conducted an experimental research on low-grade thermal power generation of scroll expander on micro ORC system test bench with R134a as the working fluid. The results show that the model can accurately predict the performance of expander under different operating conditions.…”

Section: Combinedmentioning

confidence: 99%

A review of the research status of scroll expander

Wei

Hua

Yuan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to solve the problem of energy crisis and take the road of sustainable development, the development of renewable energy and recycling of low-grade waste heat have attracted more and more attention. As a new type of volumetric energy conversion device, scroll expander is wi dely used in Organic Rankine Cycle (ORC) waste heat recovery, because of its advantages such as small size and so on. Scroll profile is one of the main factors affecting scroll expander performance. Compared with the traditional constant section scroll profile with same suction volume, volume ratio and shell size, the new type of variable section scroll profile could reduce scroll tooth height, better mechanical properties and improve efficiency, therefore making it more suitable for working under complex operating conditions. In order to reduce the head invasion rate, airflow friction factor, the power loss at the air inlet, and improve the pneumatic power conversion efficiency, a new head correction method is proposed. Although R123, R134 and R245 are the most commonly used working medium in scroll fluid machinery, the selection of working medium in scroll expander is still a key problem. The overall performance of the scroll expander can be improved by designing different inlet shapes and positions or double-symmetrical exhaust ports. The radial leakage caused by axial clearance of scroll expander can be improved by developing new scroll profile to reduce the length of radial leakage line and optimizing the design of scroll top sealing mechanism. The tangential leakage caused by radial clearance can be improved by enhancing the manufacturing precision and installation accuracy of scroll plate and designing the radial variable mechanism. At present, fewer research has been carried out on the leakage of scroll expander. Therefore reducing the leakage loss to improve the performance of scroll expander is of great significance in the future research.

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“…Thus, besides the development of a robust and reliable control system [10], it is fundamental that the components of the recovery unit are properly chosen and designed to ensure operating flexibility [11]. The expander is certainly a key component from this point of view [12]. Specifically, its capability to properly operate outside of the design conditions is particularly appreciated, enabling the recovery unit to tackle the situations produced by a HRVG which operates with a thermal power significantly lower or greater than the design datum.…”

Section: Introduction 1small Scale Orc-based Power Unit For Waste Hea...mentioning

confidence: 99%

Feasibility Assessment of a Dual Intake-Port Scroll Expander Operating in an ORC-Based Power Unit

2022

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The main driver of research in the road transportation sector is almost certainly the development of technologies which allow for the reduction of CO2 emissions from internal combustion engines (ICEs). Wasted heat recovery (WHR) from the exhaust gases of ICEs based on organic rankine cycle (ORC) power units is one of the most promising technological solutions. However, several issues are raised when the recovery unit is scaled down to small applications, not to mention the fact that thermal sources are characterized by their intrinsically transient nature, as is the case with ICEs. In fact, this leads the ORC unit having to work frequently in off-design conditions. To successfully overcome this issue, the proper design and selection of the expanders are crucial. They are generally chosen from volumetric-type machines, thanks to their capacity to deal with time-varying thermo-fluid dynamic inlet properties. Among them, scroll machines represent one of the best solutions, despite them not yet being optimized as expanders, with them having been studied more as compressors. Dual-intake-port (DIP) technology is a novel solution used to enhance the performance of scroll machines. The effectiveness of this technology was assessed thanks to a comprehensive, experimentally-validated theoretical model of the scroll. It demonstrated that DIP technology can produce a 25% increase in mechanical power with respect to the baseline machine, without modifying the in–out pressure ratio. Maintaining a constant pressure difference across the expander at 5.6 bar, the power grew from 1131 W to 1410 W with the adoption of DIP technology. This power boost is lower than that achieved with a comparable DIP sliding rotary vane expander (SVRE) already studied by the authors, but the DIP Scroll achieved a higher efficiency (50–60%) when compared to the DIP SVRE case (40%).

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Experimental modeling of a lubricated, open drive scroll expander for micro-scale organic Rankine cycle systems

Cited by 21 publications

References 49 publications

A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

A review of the research status of scroll expander

Feasibility Assessment of a Dual Intake-Port Scroll Expander Operating in an ORC-Based Power Unit

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