Obamot wrote:What I don't understand is how to engage the rotation, which is already not easy to do even in windy valley bottoms (like in Valais where most of the time the simple wind turbines are stopped) j I have the impression that the viscosity of the water must slow down the start).
It certainly slows down but using a Savonius rotor does not pose a problem: it is the best solution from all points of view:
1. the Savonius rotor has the advantage of spinning much earlier,
2. should only be put on low altitude 4-8m,
3. be best suited in the city as they take advantage of disturbed winds and regardless of direction)
4. allow the tank to be placed on the ground or better buried and insulated.
Details of the advantage of the Savonius and even better if coupled asynchronously to a Darrieus H rotor: an asynchronous Darrieus H rotor (placed higher) to achieve this
to increase the yield by 20 to 30%.
(see
http://www.retrouversonnord.be/HYBRIDE- ... RRIEUS.pdf).
Now the cost, I had inquired about medium-depth geothermal energy — which suddenly works guaranteed all year round, to the point that the Swiss are in the process of mapping their subsoil to exploit the deposit — it is “only” around 20 € to go down to -000 m where the required temperature reigns 400 days / year
The problem of deep geothermal energy is above all ground movements, especially in the plains due to climate change; moreover in Belgium there are old galleries of mines and which make the ground move. This then leads to the highly costly breakage of the vertical collectors.
I have a horizontal geothermal heat pump whose COP (coefficient of performance) is a little below that of vertical geothermal energy (moreover extremely expensive and therefore the amortization is then done over a much longer period).
NB The thermal wind turbine judiciously reinforces any heat pump (see file) and this is also part of my project
At medium altitude (there's a thread that talks about it) you don't even need to drill to have domestic hot water all year round… thermal solar panels in an insulated box are enough.
There are very few concrete cases here in Belgium of heat pumps in vertical geothermal energy because of the risks and the cost
On the other hand, I like the idea for its concept. Perhaps we can recall the yield figures and other one-year production forecasts?
PERFORMANCE (excerpts from the file):
«
Renewable energy production is almost entirely devoted to generating electricity. Yet the energy we use
the most is in the form of heat, which can only be produced indirectly by photovoltaic panels or wind turbines with a fairly low yield. »
(see
https://solar.lowtechmagazine.com/fr/20 ... dmill.html)
BETTER YIELD (LESS LOSSES)
Without the (penalizing) intermediary of electricity production to generate heat,
there are therefore significantly fewer losses.
Indeed, “…converting wind or solar energy directly into heat (or mechanical energy) can be more efficient than when an energy conversion takes place.
This means that fewer solar or wind energy converters
is needed and therefore less space and resources – to provide a given amount of heat. (Added green coloring)
"[...]
heat-producing wind turbines prove to be the most efficient in decentralized installations, dedicated to supplying heat to an off-grid household or ideally a village, a small town, or even an industrial area. »
«
In 2013, a study on a prototype produced similar results,
and estimated system efficiency at 91% »
(see
http://www.bulipi-eee.tuiasi.ro/archive ... 4_2013.pdf)
Furthermore, "
By comparing these data with the heat needs of a new, high-performance 120 m² building heated to modern comfort standards, they came to the conclusion that a heat-producing wind turbine could cover 40 to 75% of annual heat needs. heating (fluctuating according to the level of energy performance of the building) »
(see
https://solar.lowtechmagazine.com/fr/20 ... dmill.html)