Volumetric expanders for low grade heat and waste heat recovery applications

Imran, Muhammad; Usman, Muhammad; Park, Byung Sik; Lee, Dong Hoon

doi:10.1016/j.rser.2015.12.139

Cited by 218 publications

(99 citation statements)

References 98 publications

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“…A detailed explanation of the available mathematical models goes beyond the scope of this work. For an in-depth analysis, the interested readers can refer to the work of Imran et al [17] who reviewed the published mathematical models for the design of volumetric expanders.…”

Section: Expander Selectionmentioning

confidence: 99%

“…The reason for this is mainly related to very high rotational speeds leading to bearing failures. Imran et al [17] suggest that their high rotational speed and their cost are the reasons for which radial inflow turbines are not suitable for power ratings below 50 kW. Qiu et al [86] state that turbine expanders are used for power outputs greater than 50 kW, because the efficiency substantially drops below this value.…”

Section: Expander Selectionmentioning

confidence: 99%

“…According to Imran et al [17], scroll expanders represent the best choice when the power output of the system is in the range of 1-25 kW. These expanders show higher performance when the expansion is slightly wet and the volumetric ratio between the inlet and the outlet sections of the machine is limited (see Figure 8).…”

Section: Orc Plants Of 1-20 Kwmentioning

confidence: 99%

“…Among the expanders available, radial and screw represent the most recurrent choices. The major drawback of radial turbines is represented by their high rotational speeds in the power range of 20-70 kW, while that of screw expanders is represented by their high leakage losses (which are proportional to the size of the machine) [17].…”

Section: Orc Plants Of 20-70 Kwmentioning

confidence: 99%

“…Turbo expanders generally offer higher efficiencies at the cost of a more complex technology, while volumetric expanders are less expensive, but also have reduced performance. Imran et al [17] provided a comprehensive review of volumetric expanders for low-grade heat recovery. Manfrida and Fiaschi [18] compared the performance of volumetric and turbo expanders suitable for small-scale ORC.…”

Section: Introductionmentioning

confidence: 99%

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Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

et al. 2017

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Abstract:The Organic Rankine Cycle (ORC) is widely considered as a promising technology to produce electrical power output from low-grade thermal sources. In the last decade, several power plants have been installed worldwide in the MW range. However, despite its market potential, the commercialization of ORC power plants in the kW range did not reach a high level of maturity, for several reasons. Firstly, the specific price is still too high to offer an attractive payback period, and secondly, potential costumers for small-scale ORCs are typically SMEs (Small-Medium Enterprises), generally less aware of the potential savings this technology could lead to. When it comes to small-scale plants, additional design issues arise that still limit the widespread availability of the technology. This review paper presents the state of the art of the technology, from a technical and economic perspective. Working fluid selection and expander design are illustrated in detail, as they represent the bottleneck of the ORC technology for small-scale power production. In addition, a European market analysis is presented, which constitutes a useful instrument to understand the future evolution of the technology.

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Section: Expander Selectionmentioning

confidence: 99%

Section: Expander Selectionmentioning

confidence: 99%

Section: Orc Plants Of 1-20 Kwmentioning

confidence: 99%

Section: Orc Plants Of 20-70 Kwmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

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Self‐Reaction Effect‐Boosted Liquid Thermocell Based on Ethanol‐Aqueous Biphasic System

Liu,

Wang,

Fang

et al. 2023

Adv Materials Technologies

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Low‐grade heat (<100 °C) energy sources possess considerable untapped potential for sustainable power generation. Liquid thermocells (LTCs) represent an innovative solution to convert low‐grade heat into electricity. The performance of LTCs relies on the combined effects of the Seebeck coefficient (Se), electrical conductivity (σeff), and thermal conductivity (κeff). While previous studies have predominantly focused on enhancing Se and σeff, κeff has received limited attention. Therefore, in this study, an electrochemically active biphasic liquid thermocell (EAB‐LTC) composed of ferrocene (Fc) and in an ethanol‐aqueous biphasic system is proposed. The self‐reaction of the redox couple enhances Se, while the biphasic nature of the system suppresses thermal convection, resulting in reduced κeff. Compared to the conventional single‐phase LTC utilizing / , the Se is increased by nearly threefold, accompanied by a more than threefold enhancement in output power. The application of the EAB‐LTC module is successfully demonstrated in powering electronic devices, thereby establishing a novel pathway for advancing high‐performance LTCs and presenting a promising approach toward achieving carbon neutrality.

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Analysis of a novel rotating disk cylinder engine concept for power generation

Roux

Swanepoel

2018

Int J Energy Res

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Summary A new type of engine concept is proposed, namely a rotating disk cylinder engine. Unique secondary rotors with grooves act as guide vanes for a working fluid to power a main rotor with multiple cylindrical pistons. Currently, no literature exists on the proposed device and the modelling thereof. The aim of this paper is to determine the dynamic and thermodynamic behaviour of the machine so that recommendations can be made for further research work. A transient as well as a steady‐state thermodynamic model is developed for an adiabatic expansion process using first and second law analysis with air as ideal gas. The model is compared with experimental results of a piston engine driven by compressed air. Results show that the secondary rotor's angle of rotation is not a linear function of the main rotor's angle of rotation, which suggests a limitation in terms of operating speed. Furthermore, for constant power, the efficiency increases as the inlet pressure and speed decrease, while for constant efficiency, the power increases as the inlet pressure and speed increase. Results show the advantage of using three secondary rotors as it drastically decreases the pressure requirement for a constant torque output. The speed and inlet pressure of the device is, however, limited by the mass and material properties of the rotors as well as the effects of leakage. These limitations have not been considered in this initial analysis of the device and are recommended for future work.

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Volumetric expanders for low grade heat and waste heat recovery applications

Cited by 218 publications

References 98 publications

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review

Self‐Reaction Effect‐Boosted Liquid Thermocell Based on Ethanol‐Aqueous Biphasic System

Analysis of a novel rotating disk cylinder engine concept for power generation

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