The invention relates to a device for converting wind energy into another form of energy comprising a plurality of propellers having equidirectional shafts, being arranged in a matrix and driving associated energy converters. The invention generally proposes to design a device of the kind set forth in a manner such that the occupation density is at least 0.4 propellers per square meter. By this st...

A continuously manufactured profile having maximum curvature and chord with a constant torsion and a constant section, can be reshaped to obtain the required curvature, the required chord and the required correction on the position angle by modification of a relatively small part of the tail of the profile. This discovery enables mass production and stocking of profile to be mounted as blades on a...

The static inverter with an output frequency of between 100 and 1000 Hz supplies energy to the motor. The pump wheel is bladed, and is of the Francis (RTM) or propellor type. It is driven by the motor at high specific speed. - The inverter, the electric motor and the pump wheel are all incorporated within the pump housing. A pressure thrust transmitter is fitted alongside the pump wheel to control...

The water pump works with relatively low effect but against considerable manometric head. The AC motor receives current from a static inverter with an output frequency of between 100 and 1000 Hz. A probe monitors cavitation occurrence and, if necessary, can produce a signal to the inverter to lower its output frequency. It comprises a pressure thrust transmitter alongside the pump wheel. In the un...

Processes for improving or maintaining the performance of particulate and other types of water- treatment solids, especially particulate ion exchange resins, filter membranes and media, and adsorbents, which have become or are liable to be fouled with organic contaminants, micro-organisms, and waste products thereof comprise treating these solids with non-ionic surfactant and bio-dispersant which ...