Asian Phoenix Resources PowerPal MHG-500HH Handbuch für Gebrauch und Pflege - Seite 7

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When installing the penstock, try to keep it as straight as possible and avoid sharp turns

or angles. To do this, part of the hillslope may need excavating while in other places the

penstock may need supporting with poles etc. Steeper terrain has advantages over more

gentle terrain as cost is reduced by the use of a shorter penstock.

The forebay, or water holding tank at the top of the penstock can be as simple as a deep

part of a flowing stream or power conduit. It is a good idea to give some permanence to

this structure so that a constant water source is available and so the top of the penstock is

always submerged. A small dam is the best method and need only be 1 meter high. The

top of the penstock is typically placed not at the bottom but some way up the dam wall so

that the bottom of the dam acts as a sink for rotting leaf litter, deposited sand and mud

etc. This sink may need periodic cleaning out. Another good idea is to cover the end of

the penstock with a piece of wire mesh (debris screen) to keep leaves etc. from flowing in

and clogging the turbine. See Appendix A for the ideal forebay design.

The penstock is shown by the black line A-

B. In the first diagram (A) the penstock

follows the stream. This may lead to

unnecessary length and cost. In diagram B,

the most direct route is selected to reduce

length and cost. Diagram C shows the best

alternative where a side channel or 'power

conduit' is cut into the side of the hill. This

carries the water to a point as close to

above the turbine as possible and best

reduces the length of penstock required.

The power conduit roughly follows the

hill's contour and need only be a simple

ditch say 30cm x 30cm in section.

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