Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions [PDF]
Energies, 2016 This paper fully describes the working principle of slide valves in single-screw expanders (SSEs). A geometric analysis of suction and volume ratio slide valves is presented to determine the relations between volume ratio, suction closure volume ...
Yuting Wu +7 more
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Improving the semi-empirical modelling of a single-screw expander for small organic Rankine cycles
Applied Energy, 2017 Abstract The common semi-empirical modelling adopted for positive-displacement rotary expanders is revised in this paper. Paying particular attention to the leakage flow rates, the mechanical losses at the shaft and the ambient heat losses by the proposal of a more physically sound modelling, this paper aims at improving the performance simulation of
A. Giuffrida
semanticscholar +5 more sources
Experimental Study on Heat Loss of Single Screw Expander
Zhileng xuebao, 2019 The performance of a single crew expander, which is among the most suitable types of expander in the organic Rankine cycle system, plays an important role in the system.
Chen Rumeng +4 more
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Different Numerical Approaches for the Analysis of a Single Screw Expander
Energy Procedia, 2016 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.
A. Suman +5 more
semanticscholar +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.
S. Randi +4 more
semanticscholar +3 more sources
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.
D. Ziviani +5 more
semanticscholar +3 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.
D. Ziviani +4 more
semanticscholar +3 more sources
Update on single-screw expander geometry model integrated into an open-source simulation tool
IOP Conference Series: Materials Science and Engineering, 2015 In this paper, a mechanistic steady-state model of a single-screw expander is described with emphasis on the geometric description. Insights into the calculation of the main parameters and the definition of the groove profile are provided.
D. Ziviani +3 more
semanticscholar +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 +5 more
openaire +1 more source
Comparison between single and cascaded organic Rankine cycle systems accounting for the effects of expansion volume ratio on expander performance [PDF]
, 2019 Compared to single-stage organic Rankine cycle (ORC) systems, cascaded ORC systems, in which a high-temperature topping cycle and low-temperature bottoming cycle are coupled together, could have advantages in terms of removing the potential for sub ...
A I Sayma +6 more
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