"Electrical energy in Europe for Compression Air Systems (CAS) in Industry accounts for almost 100 TWh. Including leakage and the incorrect use of compressed air, the potential in terms of energy saving, has been estimated to be 30%. Using optimised compressors, specifically conceived for energy saving could offer potential energy savings estimated at close to 10%, which would represent 50% of the European Energy saving goal by 2020 (“20-20-20” EU Directive) if CAS is considered as a specific sector.. . . . Sliding Vane Rotary Compressors (SVRC) show previously unforeseen potential in terms of energy saving due to some intrinsic features specifically related to the principles of the working conditions of the machine and which do not strictly apply to other types of rotary compressor.. . . . As we strive for energy savings and CO2 reduction the inherent efficiency advantages of these machines increases the importance of developing this SVRC technology,. . . . A complex reconstruction of the pressure inside a cell was carried out using multiple piezoelectric pressure transducers positioned within an existing commercial SVRC. The data obtained represented an innovation in the sector and thanks to comprehensive mathematical modeling previously developed by the Authors; the theoretical handling of the pressure measured allowed a detailed examination of the thermodynamic aspects of the closed volume compression phase.. . . . In this paper the Authors refine the mathematical modeling of a SVRC focusing on energy consumption:. . . . Main issues of this advancement are.. . a) Filling and emptying process of the cells made by a quasi-propagatory modeling, optimised for the discharge phase;. . b) Blade settings which are not radial, so the blade motion moves according to a given angular inclination respecting the geometrical constraints;. . c) A complete derivation of a new blade dynamics modeling was considered allowing a more precise value of energy lost due to friction to enhance the main SVRC design parameters.. . . . The model has been used in order to deal with:. . . . a) Maximisation of the air mass inducted by the machine, having fixed the stator and rotor geometry, as well as the inlet and exhaust ports. Leaving as free design parameters, the eccentricity, and the associated inclination of the blades (slots), taking into account the real slot and blade dimensions, and, so, the possible geometrical interferences;. . . . b) The optimisation of the specific power required to compress the air (W\/kg\/s), having fixed a downstream pressure in the line.. . . . A validation with actual experimental data is presented based on direct measurement of the indicated and mechanical power."
|Titolo:||ENERGY OPTIMISATION IN AIR COMPRESSION. THEORETICAL AND EXPERIMENTAL RESEARCH ACTIVITY ON SLIDING VANE ROTARY COMPRESSORS|
|Autori interni:||BIANCHI, GIUSEPPE|
DI BATTISTA, DAVIDE
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|