Asian Phoenix Resources PowerPal MHG-500HH Panduan Petunjuk Penggunaan dan Perawatan - Halaman 6

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reduced. If it is larger then your power output will be increased. While increased power

output appears desirable, if the head is too large then the rotor will turn too fast and

reduce the life of the bearings. For heads less than 6 meters a MHG-200HH is the

recommended model and for heads greater than 6 meters the MHG-500HH is required.

Do not attempt to exceed the recommended head height.

The best way to measure the water flow is to take a piece of pipe the same diameter as

the penstock, insert it in the stream or dam where the flow is expected to come from, and

measure the flow from there.

In the diagram below, a short length of pipe (less than 1 meter) is buried into the side of a

small 'dam' using mud or improvised sandbags. The top end of the pipe is completely

submerged and part of the normal stream flow is diverted through the pipe. When this is

flowing smoothly, a bucket of known volume is quickly placed to collect this flow and

the time it takes to fill the bucket is recorded. The ideal bucket size would be 100 or 200

litres (half or a whole empty oil drum), but smaller buckets will work. Divide the volume

of the bucket (in litres) by the time it takes to fill the bucket (in seconds) to get the

approximate flow rate in litres per second.

SITE PREPARATION

Once the correct head and flow have been located then the length and position of the

penstock can be determined. While vertical head is important, the horizontal slope and

penstock length may vary.

A good way to reduce penstock length is shown in the following diagram.

PowerPal™ High Head