Positive displacement expanders for Organic Rankine Cycle systems

Lemort, Vincent; Legros, Arnaud

doi:10.1016/b978-0-08-100510-1.00012-0

Cited by 35 publications

(28 citation statements)

References 17 publications

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“…The conventional ORC-VCC system introduced in Section 2 implemented with some modifications to improve its performance. The integration of the ORC with the VCC system has the feature of providing electrical power F I G U R E 1 0 A, Principle of scroll expander, 88 B, principle of twin-screw expander, 89 C, principle of rotary-vane expander 90 [Colour figure can be viewed at wileyonlinelibrary.com] when cooling is not demand. Moreover, the ORC can be integrated with other refrigeration systems to recover the waste heat to enhance the overall performance of the system.…”

Section: Integration Of Orc With Other Refrigeration Cyclesmentioning

confidence: 99%

Review of innovative approaches of thermo‐mechanical refrigeration systems using low grade heat

2020

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Cooling and refrigeration systems consume around 17% of the worldwide electricity. Enhancing the performance of these systems, using renewable energy resources and waste heat recovered from industrial processes, will lead to reduced fossil fuel consumption. Improvements of these systems using ecofriendly working fluids are of equal importance. Both options contribute to the minimization of the emissions of greenhouse gases and ozone depletion substances. In this paper, a detailed and comprehensive review of the innovative and improvement approaches of the thermo-mechanical refrigeration (TMR)

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Section: Integration Of Orc With Other Refrigeration Cyclesmentioning

confidence: 99%

Review of innovative approaches of thermo‐mechanical refrigeration systems using low grade heat

2020

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“…In order to mitigate these issues, working fluids with good lubricant properties are preferred. Oil-free expanders have also been developed and the lubrication for their bearings is done by the application of grease [12]. Figure 6 adapted from [13] presents the under-and over-expansion losses.…”

Section: Volumetric Expandersmentioning

confidence: 99%

“…If a very hightemperature working fluid is passing through it, the expansion of vanes might cause them to stick and the machine will cease its operation. This limits the use of vane expanders for high-temperature applications [12].…”

Section: Rotary Vane Expandersmentioning

confidence: 99%

Expanders for Organic Rankine Cycle Technology

Alshammari¹,

Usman²,

Pesyridis³

2018

Organic Rankine Cycle Technology for Heat Recovery

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The overall power conversion efficiency of organic Rankine cycle (ORC) systems is highly sensitive to the isentropic efficiency of expansion machines. No expansion machine type is universally ideal as every machine has its own advantages and disadvantages and is suitable for a comparatively narrow range of operations of the highest efficiency. Therefore, an optimum selection of an expansion machine type is important for a financially viable ORC implementation. This chapter presents the mode of operation, technical feasibility, and challenges in the application of turbo-expanders (radial inflow, radial outflow, and axial machines) and volumetric expansion machines (scroll, screw, piston, and vane) for use in ORC systems. It can be concluded that different machines are suitable for a different range of power output in commercial applications. In general, volumetric machines are suitable for 50 kWe and below but turbomachines are more suitable for power outputs higher than 50 kWe.

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“…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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Positive displacement expanders for Organic Rankine Cycle systems

Cited by 35 publications

References 17 publications

Review of innovative approaches of thermo‐mechanical refrigeration systems using low grade heat

Review of innovative approaches of thermo‐mechanical refrigeration systems using low grade heat

Expanders for Organic Rankine Cycle Technology

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

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