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Author Topic: An analogy  (Read 817 times)
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« on: May 31, 2017, 11:22:42 AM »

The original 4 wind turbines (c.2MW) at Carsington have gearboxes. They are stationary this morning. They were joined lately by 3 direct drive turbines (c.2MW) owned by local quarries. These 3 are all moving. This situation is typical in light winds and I've always assumed it to result from the greater friction in a gearbox. It seems analogous to PV and thermal systems where the PV produces some power in the lower light levels, whereas the evacuated tubes have to warm to deltaT above the temperature of the tank bottom before any heat is transferred. In poor light no heat transfer at all may take place.

2.45 kWp PV (Navitron supply), 40 evacuated tubes (Navitron supply), Clearview 650 log burner with back-boiler heating cottage and water, 2 off 50W border collies, 1 off 35W cat, 1 off 25W cat.
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An unpaid Navitron volunteer who lives off-grid.

« Reply #1 on: May 31, 2017, 01:52:56 PM »

Those analogies are interesting Stann,
                              There was a great discussion on here some years ago about the performance of a 5kw turbine and 2 x  2kw turbines. In a good stiff breeze the 5 kw Turbine outperformed the 2 x 2kw ones but in normal breezes under force 6, the 2 x 2kw turbines leapt ahead in the output stakes. Of course, on a good site on top of a hill, the 5kw should be the winner but i went for the 2 x 2kws because of that debate. Indeed, such analogies should be made more visible to potential buyers and installers.
It is analogies and information like this that make Navitron such a valuable forum.

An unpaid Navitron volunteer,who has been living off-grid,powered by wind and solar,each year better than the last one.
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