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| Thread ID: 93977 | 2008-10-09 00:44:00 | Whatever happened to the NZ Wind generator business | John W (523) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 710901 | 2008-10-09 00:44:00 | This firm hit the news a few years back, using a Ground Based Wind turbine, sitting in the throat of a giant bell mouth velocity stack. For all the world youd think the idea was to kind of RAM the air into the oriface to drive the turbine, but the design relied on the pressure differential as the air passed from the smaller to the larger opening, creating a suction and increasing its power output. Naturally Ive forgotten the name of the business, I recall is it beng based in the NI somewhere. Thanks John in Mosgiel. |
John W (523) | ||
| 710902 | 2008-10-09 01:46:00 | You cant increase its power output you cant make enrgy There are 3 things at play Temperature of air Pressure of air Velocity of air You can change pressure and velocity with convergent or divergent ducts temp will go up and down but when ever you change them there is a small loss. A turbine can use both speed of the air like impact on the blades or air pressure on the aerofoil of the blade to extract the power. |
prefect (6291) | ||
| 710903 | 2008-10-09 01:53:00 | John I saw a doco a few months back on wind generation in cities. They are a bit like the wind generators we have in several parts of NZ except smaller and use the updraft in the City Streets. They create almost no noise unlike our big blade ones and point downwards towards the streets and mounted on high buildings. Sounds like they would be good in the bigger cities where they would be more needed. I spent last week in Mosgiel, no tall buildings there suitable, but Nellies was just as good as I remember it (food wise of course):-) |
Bantu (52) | ||
| 710904 | 2008-10-09 03:04:00 | Like I said at the start, whats happened to the company, has it gone out of business or still plugging away, that all Im after really, someone to come up with the name, so I can go further. :-) |
John W (523) | ||
| 710905 | 2008-10-09 04:24:00 | sounds like what they have in Aussie. thermal rise turbine ?? sun heats the ground, hot air rises up through the stack pushing the blades. apparently effective if you have heaps of heat (ie desert). | tweak'e (69) | ||
| 710906 | 2008-10-09 04:59:00 | You cant increase its power output you cant make enrgy There are 3 things at play Temperature of air Pressure of air Velocity of air You can change pressure and velocity with convergent or divergent ducts temp will go up and down but when ever you change them there is a small loss. A turbine can use both speed of the air like impact on the blades or air pressure on the aerofoil of the blade to extract the power. But if you put it on a conveyor belt that moves at EXACTLY the same speed..... :D |
johcar (6283) | ||
| 710907 | 2008-10-09 05:13:00 | That could fly . . . | R2x1 (4628) | ||
| 710908 | 2008-10-09 07:25:00 | You cant increase its power output you cant make enrgy There are 3 things at play Temperature of air Pressure of air Velocity of air You can change pressure and velocity with convergent or divergent ducts temp will go up and down but when ever you change them there is a small loss. A turbine can use both speed of the air like impact on the blades or air pressure on the aerofoil of the blade to extract the power. That is a rather too simplistic or puristic stance which doesn't take all factors into account. A ducted turbine or fan can increase blading efficiency/reduce blade losses by advantageously modifying the air speed relative to the blade speed, also increase air flow, and hence extract more power from the air stream, or, in the case of a ducted fan, produce more thrust. A quick Google shows quite a lot of work on ducted turbines, then of course ducted fans have been around for yonks, especially relating to aircaft engines. www.google.co.nz The NZ firm is probably Vortec Energy Ltd, here is a paper on the topic: www.ipenz.org.nz |
Terry Porritt (14) | ||
| 710909 | 2008-10-09 18:07:00 | That is a rather too simplistic or puristic stance which doesn't take all factors into account. A ducted turbine or fan can increase blading efficiency/reduce blade losses by advantageously modifying the air speed relative to the blade speed, also increase air flow, and hence extract more power from the air stream, or, in the case of a ducted fan, produce more thrust. A quick Google shows quite a lot of work on ducted turbines, then of course ducted fans have been around for yonks, especially relating to aircraft engines. www.google.co.nz The NZ firm is probably Vortec Energy Ltd, here is a paper on the topic: www.ipenz.org.nz Good to see you answered the mans question Ter. I see you couldn't resist the temptation to tell us how things work,we are all subject to vanity,so not to worry. |
Cicero (40) | ||
| 710910 | 2008-10-10 05:06:00 | Thanks, Vortec Energy Ltd was the name of the firm I was after. :-) John. |
John W (523) | ||
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