Results 11 to 20 of about 5,224,047 (250)

Tricortical versus bicortical anchorage in a double-screw tandem skeletal expander and a single-screw maxillary anchorage rapid palatal expander: A finite element analysis [PDF]

Korean Journal of Orthodontics
This study aims to employ finite element method (FEM) analysis to compare the differences between bicortical and tricortical anchorage of the posterior miniscrews in a single-screw miniscrew-assisted rapid palatal expansion (MARPE) and a double-screw tandem skeletal expander (TSE) under open and closed suture conditions.A cone beam computed tomography ...
Luca Brucculeri, Federica Pellitteri, Alfredo Salvatore Monterossi, Emanuele Paoletto, Giuliano Maino, Luca Lombardo   +5 more
core   +6 more sources

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

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

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

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

Fault diagnosis of ORC expanders using a multiscale residual network with convolutional block attention [PDF]

Scientific Reports
Expanders in organic Rankine cycle systems serve as critical energy-conversion components in low-grade waste heat recovery installations, yet their reliable operation is threatened by faults such as bearing defects, rotor imbalance, and blade cracking ...
Jing Li, Zexu Gao
doaj   +2 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

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

Experimental and numerical analysis of an oil-flooded air screw expander [PDF]

, 2021
This article describes the results of a project whose task is to research and develop a screw expander through the inversion of a screw compressor.
Rendlova Zdenka, Richter Lukas, Marco Taschek, Michal Volf, Richter, Lukáš, Lukas Richter, Zdenka Rendlova, Vit Linhart, Rendlová, Zdeňka, Taschek Marco, Planicka Stanislav, Seeger Jan, Pelikan Martin, Linhart Vit, Taschek, Marco, Linhart, Vít, Martin Pelikan, Seeger, Jan, Plánička, Stanislav, Jan Seeger, Pelikán, Martin, Stanislav Planicka, Volf Michal, Volf, Michal   +23 more
core   +2 more sources

Experimental Study on Heat Loss of a Single Screw Expander for an Organic Rankine Cycle System

Frontiers in Energy Research, 2020
For displacement expanders, the irreversible losses include leakage, friction, heat dissipation, and flow resistance. Currently, the research on the heat loss of expanders is scarce, especially with regards to experimental studies.
Wei Wang, Wei Wang, Li-li Shen, Li-li Shen, Ru-meng Chen, Ru-meng Chen, Yu-ting Wu, Yu-ting Wu, Chong-fang Ma, Chong-fang Ma   +9 more
doaj   +1 more source