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For fluctuating levels of available thermal energy, positive displacement machine has difficulty in adjusting the mass flowrate.
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Positive displacement machines (e.g. scroll, twin screw, reciprocating, etc).
In the first stage the design of piston hybrid displacement machines is proposed.
The paper presents two new rotational displacement machines designed for use in compressors, pumps and motors.
Fluids processed by the machinery involved in ORC cycles undergo several transformations among which the expansion in positive displacement machines.
External gear pumps are typically used as positive displacement machines that are capable of developing high pressures while operating at low suction pressures in hydraulic systems.
The modelling of positive displacement machines has to deal with the complexity of solving the flow through the unit in presence of simultaneous macro and micro-motions of the moving parts.
In recent years, computational fluid dynamics (CFD) has been applied for the design and analysis of positive displacement machines (both compressors and expanders) with numerous challenges due to the dynamics of the expansion (or compression) process and deforming working chambers.
In recent years, computational fluid dynamics (CFD) has been applied for the design and analysis of positive displacement machines (both compressors and expanders) with numerous challenges due to the dynamics of the compression (or expansion) process and deforming working chambers.
The limitation of the developed methodologies to be applied directly to positive displacement machines with more complex meshing such as that of single-screw has been highlighted in literature.
Positive displacement machines are the most suitable devices for small-scale waste heat to power conversion units based on an Organic Rankine Cycle (ORC) due to their capabilities of handling small mass flow rates and high pressure ratios.
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