Green Building Bible, Fourth Edition |
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Posted By: Yanntoe1 or 2kw per hour1 or 2 kW. Watts are already a rate (joules/second). Actually, for microhydro 1 or 2 kW is quite a lot. The nice thing about hydro, though, is that it tends to run 24 hours a day so even a few hundred watts adds up to quite a significant contribution.
Posted By: Ed DaviesTry the Navitron forum - there are a few people on there with plenty of experience of micro hydro.
Posted By: SteamyTeaDo a quick calculation first.
MGH
Where M = mass flow rate (kg/s)
G = gravity (10 m/s^2)
H = height (m)
Then work on 15% of that because of the environmental rules about the amount of water you are allowed to use (not the full rules, but good enough to see that it may be worthwhile or not).
You can establish the mass flow rate by creating a cross sectional area profile of the stream, then measuring the flow at different points (just use floats and a stop watch).
Posted By: Yanntoean average depth of, say, 100ml in dry weather100 mm, not millilitres?
400kW per monthThat'd be 400 kWh/month, I assume, so about 550 watts. I've no idea what your hot water requirements are but the usual rule of thumb people quote is 3 kWh/person/day so 125 W/person. For 3 people approx 1 kW total.
Posted By: djhI went looking for Steamy's 15% figure but couldn't find itIt was 12 years ago I had to do a module in it. But seem to remember that you had to leave 85% of the flow at the 95% quartile (so when it is almost dry. But it was a while back).
Posted By: SteamyTeaJust go to the gauging station uphill of your property.Is it likely there'd be such a thing for a beck of this size?
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