Results 31 to 40 of about 3,788 (266)

Non-symmetric approach to single-screw expander and compressor modeling

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   +2 more sources

Optimisation of two-stage screw expanders for waste heat recovery applications [PDF]

, 2015
It has previously been shown that the use of two-phase screw expanders in power generation cycles can achieve an increase in the utilisation of available energy from a low temperature heat source when compared with more conventional single-phase turbines.
Read, M. G., Smith, I. K., Stosic, N.
core   +1 more source

Performance evaluation of a novel single-screw compressor and expander design

IOP Conference Series: Materials Science and Engineering, 2019
Abstract Single-screw machines have seen significant development and improvement over the last decades and they are currently employed as both compressors and expanders in several applications. The correct functioning of the machine heavily relies on the meshing between the gate rotors and the central rotor which is directly linked to ...
Davide Ziviani, Patrick J. Goeghegan, Eckhard A. Groll   +2 more
openaire   +1 more source

Comparison of organic rankine cycle systems under varying conditions using turbine and twin-screw expanders [PDF]

, 2016
A multi-variable optimization program has been developed to investigate the performance of Organic Rankine Cycles (ORCs) for low temperature heat recovery applications using both turbine and twin-screw expanders when account is taken of performance ...
Ahmed Kovacevic, Ian Smith, Matthew Read, Nikola Stosic, Read, Read, Roetzel, Sakun, Smith, Smith, Smith, Smith   +11 more
core   +1 more source

Mechanistic model of an oil-flooded single-screw expander

, 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   +2 more sources

Multi-objective optimization of a novel reversible High-Temperature Heat Pump-Organic Rankine Cycle (HTHP-ORC) for industrial low-grade waste heat recovery [PDF]

, 2019
Nowadays, a high amount of industrial thermal energy is still lost due to the lack of competitive solutions for energy revalorization. Facing this challenge, this paper presents a novel technology, based on a reversible High-Temperature Heat Pump (HTHP ...
Amat-Albuixech, Marta, Mateu-Royo, Carlos, Moles, Fran, Mota-Babiloni, Adrián, Navarro-Esbrí, Joaquín, Peris, Bernardo   +5 more
core   +1 more source

Economic Analysis of Organic Rankine Cycle Using R123 and R245fa as Working Fluids and a Demonstration Project Report

Applied Sciences, 2019
The organic Rankine cycle (ORC) is a popular technology used in waste heat recovery and low-grade heat utilization, which are two important measures to solve the problems brought by the energy crisis.
Xinxin Zhang, Min Cao, Xiaoyu Yang, Hang Guo, Jingfu Wang   +4 more
doaj   +1 more source

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   +2 more sources

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

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   +2 more sources

Experimental study of predictive control strategies for optimal operation of organic rankine cycle systems [PDF]

, 2015
In this paper the performance of Model Predictive Control (MPC) and PID based strategies to optimally recover waste heat using Organic Rankine Cycle (ORC) technology is investigated.
Hernandez Naranjo, Jairo Andres, Desideri, Adriano, Ionescu, Clara-Mihaela, Quoilin, Sylvain, Lemort, Vincent, De Keyser, Robain   +5 more
core   +2 more sources