Results 11 to 20 of about 753 (248)

Non-symmetric approach to single-screw expander and compressor modeling [PDF]

IOP Conference Series: Materials Science and Engineering, 2017
Single-screw type volumetric machines are employed both as compressors in refrigeration systems and, more recently, as expanders in organic Rankine cycle (ORC) applications. The single-screw machine is characterized by having a central grooved rotor and two mating toothed starwheels that isolate the working chambers.
Ziviani, Davide, Groll, Eckhard A., Braun, James E., Horton, W. Travis, De Paepe, Michel, van den Broek, Martijn   +5 more
openaire   +3 more sources

Numerical analysis of oil injection effects in a single screw expander

IOP Conference Series: Materials Science and Engineering, 2018
The pursuit of higher efficiency for compression and micro-power generation systems has pushed the researchers to an in-depth analysis of positive displacement machines. Single-screw machines, among the others, are gaining attention in the Organic Rankine Cycle (ORC) systems as expanders, thanks to their extended maintenance intervals and compactness ...
Randi S., Suman A., Casari N., Pinelli M., Ziviani D.   +4 more
openaire   +3 more sources

Different Numerical Approaches for the Analysis of a Single Screw Expander

Energy Procedia, 2016
Abstract Positive displacement machines (e.g. scroll, twin screw, reciprocating, etc.) are proven to be suitable as expanders for organic Rankine cycle (ORC) applications, especially in the medium to low power range. However, in order to increase their performance, detailed simulation models are required to optimize the design and reduce the internal
SUMAN, Alessio, Ziviani, Davide, GABRIELLONI, Jacopo, PINELLI, Michele, De Paepe, Michel, Van Den Broek, Martijn   +5 more
openaire   +3 more sources

Mechanistic model of an oil-flooded single-screw expander [PDF]

, 2016
The power generated from Organic Rankine Cycles (ORCs) is directly related to the performance of the expander used, which in many cases it is adapted from the original compressor. The efficiency of positive displacement expanders depends on several aspects such as internal volume ratio and pressure ratio (under- and over-expansion), leakages, non ...
Ziviani, Davide, Bell, Ian H., De Paepe, Michel, van den Broek, Martijn   +3 more
openaire   +3 more sources

Low-order models of a single-screw expander for organic Rankine cycle applications [PDF]

IOP Conference Series: Materials Science and Engineering, 2015
Screw-type volumetric expanders have been demonstrated to be a suitable technology for organic Rankine cycle (ORC) systems because of higher overall effectiveness and good part-load behaviour over other positive displacement machines. An 11 kWe single-screw expander (SSE) adapted from an air compressor has been tested in an ORC test-rig operating with ...
Ziviani, Davide, Desideri, Adriano, Lemort, Vincent, De Paepe, Michel, Van Den Broek, Martijn   +4 more
openaire   +3 more sources

Waste Heat Recovery from Diesel Engine Exhaust Using a Single-Screw Expander Organic Rankine Cycle System: Experimental Investigation of Exergy Destruction [PDF]

Energies, 2020
The organic Rankine cycle is a mature small-scale power generation technology for harnessing low- to mid-temperature heat sources. However, the low efficiency of the cycle still hinders its widespread implementation.
Yeqiang Zhang, Biao Lei, Zubair Masaud, Muhammad Imran, Yuting Wu, Jinping Liu, Xiaoding Qin, Hafiz Ali Muhammad   +7 more
doaj   +2 more sources

Employing a Single-Screw Expander in an Organic Rankine Cycle with Liquid Flooded Expansion and Internal Regeneration [PDF]

Energy Procedia, 2017
Abstract Positive displacement expanders are proven to be cost-effective in the low to medium power range for Organic Rankine Cycle (ORC) systems. Among the different types of volumetric expanders, the screw-type presents a favorable combination of relatively high internal volume ratio (up to 7) and isentropic efficiency (up to 80%) with respect to ...
Ziviani, Davide, Gusev, Sergei, Schuessler, Stefan, Achaichia, Abdennacer, Braun, James E., Groll, Eckhard A., De Paepe, Michel, van den Broek, Martijn   +7 more
core   +4 more sources

Efficiency of osseodensification versus screw expansion technique for augmentation of narrow alveolar ridges: A comparative clinical study

Journal of Baghdad College of Dentistry
Background: Alveolar ridge expansion is proposed when the alveolar crest thickness is ≤5 mm. The screw expansion technique has been utilized for many years to expand narrow alveolar ridges.
Nawfal H Tofan , Ali HA Al-Hussaini , Nazih S Mustafa   +2 more
doaj   +3 more sources

Theoretical and experimental characterization of single-screw expanders for ORC applications

, 2017
Medium to low grade waste heat recovery from industrial processes is of particular interest to address both environmental concerns and the need of more efficient thermal systems. Organic Rankine cycles (ORCs) have been demonstrated to be a viable solution to convert waste heat into valuable electric power.
Ziviani, Davide
openaire   +2 more sources

Numerical Study On The Internal Irreversible Flow Loss of Single Screw Expanders [PDF]

, 2021
Abstract As a type of positive displacement expander, single screw expander (SSEs) can be widely applied in the energy storage systems and waste heat recovery field. The irreversible losses (such as leakage, flow, heat transfer, intake and exhaust pressure loss…) have great influence on the expander performance.
Lili Shen, Yuting Wu, Wei Wang, Biao Lei, Wei Duan, Ruiping Zhi   +5 more
openaire   +1 more source