Fan Mini-Review: High Speed Battle Ensues (cover your ears)

[Utnorris]

Funny about the the Sans being hard to find. I just counted how many I have on hand, 41x 120's and 42x 80's. I guess I will have to post some for sale. I know it's a little off topic, but does charging $10 a piece sound reasonable? I need to sleeve them still, so it will be probably a week before I have them ready. Anyone interested?
Thanks,
Utnorris

[Utnorris]

So I have a couple, .

Utnorris

[WhiteFireDragon]

vapor, are there any tests on different fans (with same rmp) and water temp? san aces have huge dead spots in the middle so even though it can move a lot of air quietly, it might not be as efficient on rads since air wont get evenly distributed throughout the whole rad

[Utnorris]

I think during the second fan review the fans were compared on the radiators also as far as CFM. Its in the sticky on the first page.
Thanks,
Utnorris

[Vapor]

Okay...deadspots...been meaning to go into more indepth than I have in the past. (1, 2, 3a, 3b, 3c).

Here's a few minutes work with a bit more detail....but it's still all 'worst case scenario' (that doesn't actually happen since the airflow diffuses and evens out when the fan is separated from the fins even a little).

Below are the three images I made and used in Photoshop's analysis tool to measure the area of the blue sections.

The green lines are used to separate the 12 channels of airflow a PA series radiator has (has 11 waterflow channels (IIRC) that act as partitions to the airflow).

40mm deadspot:


50mm deadspot:


60mm deadspot:


No deadspot:


Graph plotting the percentages of airflow through the 12 channels. None are all that far from 'ideal' (and this is worst case scenario).



EDIT: because the graph isn't 100% clear...I'll put some numbers behind it.

Here's a listing of what % of airflow the center half of the radiator gets (outer quarters are 100% - whatever I list).
40mm deadspot: 54.86%
50mm deadspot: 51.56%
60mm deadspot: 46.79%
No deadspot: 59.74%
Ideal: 50%

Here's a listing of what % of airflow the center third of the radiator gets (outer thirds are 100 - whatever I list).
40mm deadspot: 33.46%
50mm deadspot: 30.79%
60mm deadspot: 28.79%
No deadspot: 40.72%
Ideal: 33.33%


Note, again, these are worst case scenarios...real-life distribution of airflow tends away from listed and toward ideal.

[Vapor]

I think during the second fan review the fans were compared on the radiators also as far as CFM. Its in the sticky on the first page.
Thanks,
Utnorris

They are in the mini-reviews of Roundup 3 too

[Utnorris]

I have 12 Sans running in my w/c setup, 4 on each rad in a push/pull setup and they are move a lot of air through the MCR220's. That's at 5 volts too.
I think these fans are the best, of course I have only used stock fans and Silenz fans in the past, so I really don't have reference to work with, just what I have read on here.

Utnorris

[Martinm210]

Okay...deadspots...been meaning to go into more indepth than I have in the past. (1, 2, 3a, 3b, 3c).

Here's a few minutes work with a bit more detail....but it's still all 'worst case scenario' (that doesn't actually happen since the airflow diffuses and evens out when the fan is separated from the fins even a little).

Below are the three images I made and used in Photoshop's analysis tool to measure the area of the blue sections.

The green lines are used to separate the 12 channels of airflow a PA series radiator has (has 11 waterflow channels (IIRC) that act as partitions to the airflow).

40mm deadspot:


50mm deadspot:


60mm deadspot:


No deadspot:


Graph plotting the percentages of airflow through the 12 channels. None are all that far from 'ideal' (and this is worst case scenario).



EDIT: because the graph isn't 100% clear...I'll put some numbers behind it.

Here's a listing of what % of airflow the center half of the radiator gets (outer quarters are 100% - whatever I list).
40mm deadspot: 54.86%
50mm deadspot: 51.56%
60mm deadspot: 46.79%
No deadspot: 59.74%
Ideal: 50%

Here's a listing of what % of airflow the center third of the radiator gets (outer thirds are 100 - whatever I list).
40mm deadspot: 33.46%
50mm deadspot: 30.79%
60mm deadspot: 28.79%
No deadspot: 40.72%
Ideal: 33.33%


Note, again, these are worst case scenarios...real-life distribution of airflow tends away from listed and toward ideal.

That's awesome, so I assume this is in push, have you done something similar to measure the distribution in pull on the suction side?

It appears that it's fairly uniform even without a shroud and why pull is generally better

[Vapor]

Haven't done any measurement of airflow....this is just shapes and theory at this point.

The way it is...it's a theoretical situation of a push fan flush against the radiator surface with even airflow over the blades (a.k.a., the worst case scenario ). The further you move the fan back, the more diffuse the airflow is (good thing--will tend more toward the ideal line). Also, pull does tend to diffuse the airflow even quicker I'd imagine since the air isn't being moved out in a specific direction, it's taken in from any direction.

[Martinm210]

Haven't done any measurement of airflow....this is just shapes and theory at this point.

The way it is...it's a theoretical situation of a push fan flush against the radiator surface with even airflow over the blades (a.k.a., the worst case scenario ). The further you move the fan back, the more diffuse the airflow is (good thing--will tend more toward the ideal line). Also, pull does tend to diffuse the airflow even quicker I'd imagine since the air isn't being moved out in a specific direction, it's taken in from any direction.

Ahh, I thought you built some sort of shroud to the air flow. I was thinking about using my ultra sensetive manometer and try and measure pressure or negative pressure instead.

[Giannis86]

Funny about the the Sans being hard to find. I just counted how many I have on hand, 41x 120's and 42x 80's. I guess I will have to post some for sale. I know it's a little off topic, but does charging $10 a piece sound reasonable? I need to sleeve them still, so it will be probably a week before I have them ready. Anyone interested?
Thanks,
Utnorris

may i ask why on earth you even have 40 of those fans?
anyway if they are so hard to find im sure you could get something more for them..

[Utnorris]

may i ask why on earth you even have 40 of those fans?
anyway if they are so hard to find im sure you could get something more for them..

I have collected them over the last year or so, never know when you could use a good fan .

As far as the price, they are used and I just didn't feel right selling them for more to members on this site, especially since so many on here have helped me out so much. Anyway, I started a thread in the "For Sale" section.

Thanks,
Utnorris

[Vapor]

Ahh, I thought you built some sort of shroud to the air flow.

I have not...though that is certainly an awesome idea to empirically test this. I figure you're more in position to do that, however...considering the number of radiators you have and the various shrouding people are imploring you to test

I'll do it, but it's gonna be with an MCR only (which means very little aftermarket shrouding)

[Utnorris]

By the way, if any of the "regular" reviewers/testers (i.e. Martin, Vapor, etc)would like a couple to help in their testing let me know. I wouldn't have a problem donating a few to Mad science.
Thanks,
Utnorris

[nettwerk2006]

I'd be interested in seeing the results of the Delta GFB1212VHW fan.

[Vapor]

Tested that in my first review last spring

http://www.xtremesystems.org/forums/...d.php?t=137832

(and thanks for the offer Utnorris, but I've already got a small army ...maybe Martin would like to try them give them a whirl)

[Utnorris]

Yes, but do you have any 80mm San Denki's? Eh? Yeah baby!!




Seriously, the offer is out there to any of the regular mad scientists.
Utnorris

[Vapor]

I have one

[Utnorris]

[septim]

utnorris what are those denkis attached to, the ones inside the box...

[Utnorris]

Those are the 80's and they are attached to a bracket that holds them. It looks like they could be modified to act like a shroud. I will take a couple of pictures and post them for you.

Utnorris