Seite - 1388 - in Book of Full Papers - Symposium Hydro Engineering

A not insubstantial side effect is that uninhibited operation is possible even in flood conditions, during which previous design models are required to shut down. Additionally, there is no risk of silt build up in the run off zone. The curved draft tube also results in space saving design outcomes at the construction stage. Surface area reduction of up to 20% can be put to efficient use in the field of environmental considerations, for example the upstream migration of fish. In a typical design configuration as a bay shaped power plant, with a combination of movable weir system, generously dimensioned ejector exhaust and laterally positioned inlet with turbine system, the entire river profile remains free for flood discharge. Fig. 30 Aerial photography of ejector plant Gaissulz / Ybbs [3] In addition to the classic measures of increasing energy yield at existing locations, such as increasing the dam height, underwater excavation, more efficient regulation and increasing the amount of full load, the use of ejectors should be considered as a way forward for the redevelopment of hydropower plants. This special technology, with patented construction details and special software for design calculation, can be offered by ZT-Fritsch GmbH, the company behind the research project and with many years of experience in hydropower design. 1388