Wooden Workshop

[eSCHEn]

Honestly Steve I would have my doubts unless you put in quite a few. They'll certainly stir things up a bit but ultimately computer fans aren't really that powerful, even the larger 120mm+ ones.

However, if they're costing you nowt and you've got a bit of time to tinker with them then I would give it a go. You've got nothing to lose

Usually the larger the blades the more air they shift which means they can spin slower and be more quiet.

When my place gets running I have a standard 5" bathroom fan. It moves a whooooor of air and is extremely quiet. Cost £15 brand new and runs from 240AC.

The fan on demand based on humidity / temperature is a good one. Honeywell do a simple sensor that'll do temp and humidity in one. Few quid IIRC.

Those 5" ones come with humidistats built in, for only a few quid more...

 

[cumbriasteve]

Hmmm, the price of them does not matter too much, it's the running costs I am considering, the way the weather has been this year it would be on for 6 months at a time I suspect.

I will have to get my calculator out and see what the consumption could be, if we use any more electric in this house I am going to have to put a direct line into Sellafield, good job it's just down the road

Those larger fans that Gaz mentions look good too.

 

[eSCHEn]

They're about 15 - 20W rated IIRC. So that's roughly two days non stop for one unit of electricity, however much that costs you.

12VDC system is a nice idea though, don't get me wrong. Opens up all sorts of control and feedback systems as well as free solar power as your demands will be small.

This is a nice unit to use: http://www.hobbytronics.co.uk/sensors/temp-pressure/rht03-humidity-temp-sensor

 

[gaz1]

theres one other point i will say dont have it blowing in unless you use a 4 fin inside the tube as dosnt blow enough ok for output end but not for input end

only aware of it due to a vid on youtube that was using it to blow oil burner with it

 

[addjunkie]

If your sucking in air or using ducting, suck throw a dessicant,

Even better a rotating dessicant wheel. Itll dry the air your circulating, and dryer air with a low rh will attract the moister

 

[gaz1]

here you are steve id new id find it after a bit

 

[cumbriasteve]

What a smart set up that is, think I need to study this small scale heating and ventilation a lot more.

Looks like my free fan supply will provide some fun and games when I have time to start experimenting

 

[Shox Dr]

Good find gaz, ive two of those im going to put inline to the windscreen vents in the truck. That baffle will make a bit difference

 

[gaz1]

if you was to use a reducer in doing so you would speed up the movement of air within the tube than the way they have used a block end with a small outlet

on free energy heres the one i posted earlier

just remember you cant create more or the same electric from the output

but these make it viable to move air without paying for it

 

[cumbriasteve]

This guy suggests the free energy videos are not what they seem:

 

[gaz1]

yeah i agree looks good but doesnt work however there is a coil type out there

on another note cold air being blown upwards through a tube to the highest point and along the shed and blown back down again via difuser will warm the air at its highest point however the effect of the air being blown can actually suck warm air in



sounds silly but we notice it via the wood burners but you also notice it on cars when theres a leak and it sucks air into the system

it also shows on pressure gauges

http://hyperphysics.phy-astr.gsu.edu/hbase/fluids/venturi.html

v2 is faster than v1

the venturi effect also means you can add air at v2 as it creates a suction at this point due to fast moving air