By Baker, A. Clive
This publication describes how huge tides boost specifically areas and the way the power can be extracted via construction appropriate barrages
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Additional info for Tidal power
This effect can be seen as the flat-topped energy output curves in Fig. 2. 2 hou 11 12 1 AM 2 3 4 5 6 7 8 9 10 11 12 Fig. 3 Optimum operating cycle for Severn barrage as assessed in 1923 Optimising the turbines' starting head for maximum energy is the usual starting point. However, the value of the energy generated and supplied is not normally uniform throughout the day or even the week; energy generated during times of peak demand can have a value much higher than energy produced in the early hours of a weekend morning.
7 Runner for Vidalia scheme (Markham & Co) 46 Turbines and generators Fig. 8 Rock Island Project machines on non-tidal projects, means that this type is generally favoured for large tidal power schemes. There are other factors which are discussed below. Recently, the advent of epicyclic gearboxes rated at several megawatts at the torques appropriate to large bulb turbines has led to several machines being built which include an epicyclic gearbox within the bulb to increase the speed of the generator.
M. m. m. m. After allowing for the time that has to elapse between high water and the start of generation, there is a limited number of mid-range tides where advantage can sensibly be taken of these changes by pumping at high tide. This conclusion applies to the Severn estuary. Elsewhere, high water of spring tides will be concentrated around a different time of the day, so that tides which will allow advantage to be taken of tariff changes will lie in a different part of the spring-neap cycle.
Tidal power by Baker, A. Clive