Dart threadwheel skimmer build

[smjtkj]

<a href=showthread.php?s=&postid=8391269#post8391269 target=_blank>Originally posted</a> by zapata41
well what were the best numbers pulled from the tiny might and watt draw. i dont havea problem building a diffuser, i have in there right now for the air stones anyhow. as the skimmer sits you cant see but an inch or so into the chamber and there are bubbles all the way down to the bottom 1" of the chamber.

maybe i should just stick with it as it is

The best air draw with a pump was a little under 90 scfm and 70
for the rest of the time after the hailea air pump took a fall. It used 94 watts between both the air pump and th tiny might.

 

[zapata41]

what is the conversion for scfm to lpm

thanks

Tim

 

[smjtkj]

Well 68 liters per minute is equal to 2.4 scfm. I can't seem to find the conversion right now. That is from a alita al-60 pump spec sheet.

 

[zapata41]

and your pump is pulling 70-90scfm or scfh
Tim

 

[spazz]

the conversion is.... 28.31 liters to the cubic foot. there is 7.48 gallons to the cubic foot.
these are aprox. conversion numbers to work with.

 

[smjtkj]

Right now the dart is pulling 120 scfh with no assistance. Your air pump is pushing somewhere around 150 scfh.

 

[smjtkj]

<a href=showthread.php?s=&postid=8391609#post8391609 target=_blank>Originally posted</a> by spazz
the conversion is.... 28.31 liters to the cubic foot. there is 7.48 gallons to the cubic foot.
these are aprox. conversion numbers to work with.

Thanks Scott, I couldn't find that conversion. What you think about the dart pulling over 120 scfh without the air pump?

 

[zapata41]

ok now the next ?

what type of o-rings are you using

 

[smjtkj]

I am using the orange silicone orings from Mcmaster Carr.

 

[smjtkj]

Here is a little updated skimmate pic from 1 pm today.

This is about a days worth of skimmate!

 

[spazz]

<a href=showthread.php?s=&postid=8391628#post8391628 target=_blank>Originally posted</a> by smjtkj
Thanks Scott, I couldn't find that conversion. What you think about the dart pulling over 120 scfh without the air pump?

thats not bad at all. but on a taller body you would have a problem getting that much air into the skimmer. this is whay tis best to supercharge taller skimmers. if that skimmer was 5 ft tall you would never get that kings of air to watt ratio. good work there guy. right now that skimmer is about the most effecient skimmer you can find. you are less than 1 watt per cubic foot of air to the skimmer. the bubble kings are 1.5 watts per cubic foot. the dart needle wheels run about 1.23 watts per cubic foot of air with an air poump and 150-160 schf of air. so you are getting some good results from this design. now you need to see how long it will last with out getting clogged up and not running right.

 

[spazz]

you should have ahd a taller riser tube so you donrt have to have the water level so low.

 

[jnarowe]

Hey Scott, I am running the Alita 100 (120W) and supposedly 100 ltr/min of air. What would the watts per cubic foot be?

 

[ChemE]

<a href=showthread.php?s=&postid=8391711#post8391711 target=_blank>Originally posted</a> by jnarowe
Hey Scott, I am running the Alita 100 (120W) and supposedly 100 ltr/min of air. What would the watts per cubic foot be?

100 L/min with 120 watts is 0.566336933 watts per cubic foot.

 

[smjtkj]

<a href=showthread.php?s=&postid=8391710#post8391710 target=_blank>Originally posted</a> by spazz
you should have ahd a taller riser tube so you donrt have to have the water level so low.

Yeah, I didn't realize that I would need more than an 8 inch tall 6 inch diameter riser.

 

[Roland Jacques]

<a href=showthread.php?s=&postid=8391711#post8391711 target=_blank>Originally posted</a> by jnarowe
Hey Scott, I am running the Alita 100 (120W) and supposedly 100 ltr/min of air. What would the watts per cubic foot be?

Why is your air "supposedly" 100 LPM??? aren't you using a flow meter?

 

[zapata41]

looking around at orings and on mcmaster i only find silicone with a durometer shore of 70 which is pretty hard . also are you ordering them on the roll and cutting and superglueing them to size or ordering them premade

Thanks

Tim

 

[jnarowe]

<a href=showthread.php?s=&postid=8391773#post8391773 target=_blank>Originally posted</a> by ChemE
100 L/min with 120 watts is 0.566336933 watts per cubic foot.

That's not bad right? Seems fairly efficient. Can you reply with your equations to arrive at that? I am confused by a couple posts and how that is determined. From what I am reading, the Alita 100 delivers 3.54 scfm?

Roland wrote: Why is your air "supposedly" 100 LPM??? aren't you using a flow meter?

:lol: No. What the hell for? I don't really care what it is, as long as my skimmer works well and I have not acheived the geekdom levels of so many here on RC.

It is supposedly 100ltr/min. because that is what the air pump is called; the Alita 100. Based on some comments in this thread, it appears that it may actually be a bit higher than that.

 

[mavgi]

zapata41

you said you build now skimmer. if you can try long neck, with this material you pull a lot of air but if you want small bubble without to increase the watt of the pump you want more long neck. if you can test it without to build the cup yet i think you will get better performance.

 

[mavgi]

<a href=showthread.php?s=&postid=8391675#post8391675 target=_blank>Originally posted</a> by smjtkj
Here is a little updated skimmate pic from 1 pm today.

This is about a days worth of skimmate!

look nice mike can you show your air pipe because i think you can make the bubble more small without to increase to much the watt