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Wind turbines and chimney effect ventilation

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Wind Generation

Last Post by Mars 4 years ago

13 Posts

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NeilSondhi

(@neilsondhi)

Trusted Member Contributor

Joined: 5 years ago

Posts: 30

Topic starter 15/03/2021 10:32 am [#24]

Does anyone know why chimney effect ventilation is not used as an advantage to drive mini turbines at homes?

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Chris-in-Kemnay

(@chris-in-kemnay)

Estimable Member Member

Joined: 5 years ago

Posts: 52

20/03/2021 11:22 am

Good question. I always wondered the same about rain water and a down pipe, until i watched a Youtube video about it and designing a more efficient pelton wheel.

It seemed that on the video, if i remember correctly, the most they could generate was 5w without the wheel slowing down too much. I assume the same is the case with the chimney?

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Bob@Lochinver

(@boblochinver)

Reputable Member Member

Joined: 5 years ago

Posts: 109

20/03/2021 1:56 pm

@chris-in-kemnay I think i watched the same video about the rainwater driving the wheel at the bottom of the pipe. The bottom line appears to be that it just wasn’t worth the effort of setting it all up for what would be a very small return in watts 3 - 5 watts. I have a small slow running burn in my garden that I was thinking if i sorted it out it might be able to drive a hydro fan ? Its not deep unless theres been rain off the mountain but its always running and it has a few metres drop from the start to the leaving my property and going into he sea about 50 metres away. Now if i could get a 100 watts from that all the time it would be worth at least seeing it if would work. I can build heads of water into the burn if thats needed. So many ideas so little time haha

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Chris-in-Kemnay

(@chris-in-kemnay)

Estimable Member Member

Joined: 5 years ago

Posts: 52

20/03/2021 2:01 pm

I would so love some hydro power 🙂

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Bob@Lochinver

(@boblochinver)

Reputable Member Member

Joined: 5 years ago

Posts: 109

20/03/2021 2:49 pm

@chris-in-kemnay I’m going to have to find something that would work with small amount of flow i have, I’m thinking how can i work out the flow rate and what would be the best way to capture that energy

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Chris-in-Kemnay

(@chris-in-kemnay)

Estimable Member Member

Joined: 5 years ago

Posts: 52

20/03/2021 3:13 pm

I watched a building alaska programme. The guy ran his led lights in the house from a small hydro plant in a stream with almost no drop and no real speed of flow.. he captured the water meters away in a 50mm tube and narrowed it just before the turbine wheel which was enclosed inside the top of a 25 gallon drum . It looked very interesting.. the point was that you didn't need that much flow or drop the have enough momentum to power the wheel. The weight if water in the tube and the size of the opening just before the wheel increased the force of the water from a trickle upstream to a jet at the wheel.

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4516

20/03/2021 5:52 pm

@chris-in-kemnay, I'd love to learn more. We have a pond that's fed by other ponds and subterraneous water, and there's a fair amount of water that pours into it... I wonder how much power we could generate from that. I think I'll get some books and do some reading.

Staying on the subject of hydro, a few years ago we have afternoon tea at Pale Hall. The place was powered by (and still is) hydroelectricity on 1920. How cool is that? https://myhomefarm.co.uk/hydroelectricity-at-pale-hall

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NeilSondhi

(@neilsondhi)

Trusted Member Contributor

Joined: 5 years ago

Posts: 30

Topic starter 22/03/2021 8:38 am

I think I saw that on youtube as well, very interesting. I was thinking like the garden hose - the more you squeeze the higher pressure you can create. Let's say in a chemney we can get the same effect - sun light heating the walls creating pressure difference to drive air up. Not sure if this would be enough to drive the blades of a blower into rotation power even when there is no wind. Am I making any sense?

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Chris-in-Kemnay

(@chris-in-kemnay)

Estimable Member Member

Joined: 5 years ago

Posts: 52

22/03/2021 9:38 pm

I think the density of the water would drive the turbine more efficiently than the less dense and more compressible air. Talking about Hydro generation, did anyone see the news today? Nova energy and EV charging at Cullivoe pier in Yell Shetland, only 6 miles from where I grew up! there's a nice youTube video with an M3.. I'm not sure how long they charged for, but its only a 7kWh charger.

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

24/01/2022 5:18 pm

Hi Everyone,

You may be interested to know that at the moment wind is providing 3.6% of total generation and coal is providing 6.7%.

Please checkout the site detailed below.

https://grid.iamkate.com/

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Majordennisbloodnok

(@majordennisbloodnok)

Famed Member Moderator

Joined: 4 years ago

Posts: 1759

24/01/2022 6:04 pm

Another useful site is

https://www.carbonintensity.org.uk/

basically pulling the same data as the National Grid When to Plug In app. Slightly slower than IAmKate.com, but allows for regional analysis.

Right at the moment, where I am is currently only getting 0.7% from wind and is up at 64.4% from gas, leading to a grand sum total of 293gCO2/kWh which is pretty rubbish. Ho, hum....

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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Kev M

(@kev-m)

Noble Member Member

Joined: 5 years ago

Posts: 1276

24/01/2022 7:16 pm

Posted by: @derek-m

Hi Everyone,

You may be interested to know that at the moment wind is providing 3.6% of total generation and coal is providing 6.7%.

Please checkout the site detailed below.

https://grid.iamkate.com/

My area is 40% coal and 609g CO2/kWh 😮.

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