22.Energy Conversion by John G. Webster (Editor)

By John G. Webster (Editor)

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Supplying consumers with required flows at necessary pressures by this means involves certain restrictions on the pressure variations in the collector–distributor due to uneven consumption. At the branching points of the consumers’ supply ducts to the collector–distributor, the pressure must be higher than a value p2min determined by the pressure required for pneumatic equipment and the losses accompanying compressed air flow along the distribution ducts. Collector–distributor supply points will be at a lower pressure than the value p1max set at the buffer reservoir discharge valve in the ecompressor station.

Thus, the dc machine is able to drive other mechanically coupled machines such as pumps or elevators. So, both motor and generator operation are two modes of the same machine, depending on the direction of power flow. The sliding brush–commutator mechanical contact (3) and the mechanically sensitive commutator itself put electrical and speed limitations to dc machines. Furthermore, brush wear under normal operation conditions, along with carbon dust production, requires maintenance such as changing the brushes that are too short and cleaning the machines to avoid electrical flashover within the windings due to the electrically conducting carbon dust layers.

Fig. 6. Adiabatic storage of compressed air. connected to the compressor station (6) by a compressed air supply duct (7), and to the main network by a distribution line (8). Both ducts are dimensioned to suit the average consumption. Water is supplied to the hydrochamber by a supply duct (9). A hydraulic connection (11) exists between the pneumochamber and the hydrochamber, made up of metal ducts, with mining workings forming a hydraulic arrester in the lower part (12). All ducts are fitted with shutoff valves (14), permitting the hydropneumatic accumulator to be isolated for inspection and maintenance as necessary.

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