does this pump have enough head to push through a 1/4 in system http://www.dtekcustoms.com/index.asp?PageAction=VIEWPROD&ProdID=148
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pump head for 1/4in system
- Thread starter cell_491
- Start date
Well that was what I thought as well until someone ran a little experiment with an Eheim pump that they put on the ground and ran a tube up to their 2nd story bedroon computer and it seemed to work just fine with 1/4" tubing. Koolance says that they can have an EXOS up to 10 feet above the computer and it will work just fine.
anyway, even if i have to prime the pump first thats no big deal because this is the only 12v pump with any hope of ever fitting inside my exos casing. Its gonna be a kickass mod because we all no that the worst thing about an exos is its horrible flow rate
http://www.swiftnets.com/products/mcp350.asp
Can buy it from www.swiftnets.com
Or can buy it from DangerDen:
http://www.dangerdenstore.com/product.php?productid=135&cat=4&page=1
Can buy it from www.swiftnets.com
Or can buy it from DangerDen:
http://www.dangerdenstore.com/product.php?productid=135&cat=4&page=1
thewhiteguy
Supreme [H]ardness
- Joined
- Jun 17, 2002
- Messages
- 4,551
1/4"? The pump is the least of your worries ... I recommend seeing a doctor to get your brain checked out.
wtiger said:
Torque isn't particulary important in an engine either IF you are already moving. You need torque to accelerate. The same thing is true in a typical water cooled computer closed system because the water isn't being sucked out of a barrel and pushed up into the air. It is being pushed to the top of a circuit where gravity and flow push it back to the pump which pre-loads the pump and allows it to much more easily pump that short distance again and then the cycle repeats itself.
So while pump head gives some numbers to compare other pumps with, it doesn't mean a lot.
Top Nurse said:Torque isn't particulary important in an engine either IF you are already moving. You need torque to accelerate. The same thing is true in a typical water cooled computer closed system because the water isn't being sucked out of a barrel and pushed up into the air. It is being pushed to the top of a circuit where gravity and flow push it back to the pump which pre-loads the pump and allows it to much more easily pump that short distance again and then the cycle repeats itself.
So while pump head gives some numbers to compare other pumps with, it doesn't mean a lot.
Yes - and while we're at it, we can just blithely discount that friction exists and build ourselves perpetual motion machines too I guess?
cell_491 said:
True - from a certain point of view.
Performance is linked to flow rate. The higher the flow rate, the higher the performance. The amount of difference that increased flow rates make gets lesser as flow rates go up.
The issue with 1/4" is that the tubing and fittings offer more resistance to flow. The pump has to work over 4x harder to push water through 1/2" tubing and fittings than it has to work to push the same flow rate through 1/2" tubing and fittings.
So while the flow rates can be equal, the 1/4" solution requires a far stronger pump to achieve the same effect.
Of course, if what you're really saying is that the performance difference between a 1/4" and a 1/2" system when using the same pump is irrelevant to you, then that's a different matter.
Top Nurse said:Well you do need a little torque to get the thing moving and continuing to go.
Basic torque/power equation:
Power = torque x rpm.
Whenever a pump is running, it is using all its mechanical power to sustain the flow rate at whatever the flow rate is, which is dictated by the level of back-pressure that the pump has to overcome at that flow-rate.
To say that torque is unimportant to a pump is, well, naive to put it politely. For the torque to be unimportant then the pump must also be drawing zero power.
Everytime I get in a conversation with you I feel like I am talking to my father or brothers who all happen to be engineers Are you by chance an engineer?
I bow to your superior knowledge in the mechanical sciences. My forte runs in human engineering so to speak. So I will ask you the same question I always end up asking my family. If all this is true how come these low flow devices work so good? My family tells me it shouldn't and when I press them on it they tell me that something is screwy and suggest I don't use what I have been sucessfully using.
So perhaps I am not explaining things right as I am a practical kind of gal. I don't want to get involved in too much as to the why's and where's. I just want the thing to work the way I want it to, which they do!
Are you by chance an engineer?I bow to your superior knowledge in the mechanical sciences. My forte runs in human engineering so to speak. So I will ask you the same question I always end up asking my family. If all this is true how come these low flow devices work so good? My family tells me it shouldn't and when I press them on it they tell me that something is screwy and suggest I don't use what I have been sucessfully using.
So perhaps I am not explaining things right as I am a practical kind of gal. I don't want to get involved in too much as to the why's and where's. I just want the thing to work the way I want it to, which they do!
Am not an engineer. Am actually a computer programmer, but did take advanced physics to 2nd yr university. Not that this helped me that much with water-cooling, other than to facilitate my understanding of it as I learned more about it over the last 4 years.
Sorry to do this to you, but:
1) Define low-flow
2) Define "work so good"
There is no such thing as a device that is optimised to work better at low flow than at higher flow, unless there is some degenerate flow regime happening - but such a circumstance would actually be denying that device the ability to reach its full potential.
When it comes to thermal convection heat transfer, there's no such thing as low flow working better than high flow. This is an utter fallacy, and this is what your family are referring to with their engineering hats on. They are, in fact, very correct.
The real question is this: what is "adequate" for one's needs?
Top Nurse said:
Sorry to do this to you, but:
1) Define low-flow
2) Define "work so good"
There is no such thing as a device that is optimised to work better at low flow than at higher flow, unless there is some degenerate flow regime happening - but such a circumstance would actually be denying that device the ability to reach its full potential.
When it comes to thermal convection heat transfer, there's no such thing as low flow working better than high flow. This is an utter fallacy, and this is what your family are referring to with their engineering hats on. They are, in fact, very correct.
The real question is this: what is "adequate" for one's needs?
Top Nurse said:If all this is true how come these low flow devices work so good? My family tells me it shouldn't and when I press them on it they tell me that something is screwy and suggest I don't use what I have been sucessfully using.
So perhaps I am not explaining things right as I am a practical kind of gal. I don't want to get involved in too much as to the why's and where's. I just want the thing to work the way I want it to, which they do!
Top Nurse, these "low flow" water cooling devices you refer to may be good at xx flow rate. But if you increase xx flow rate, they will perform better.
Note this graph from Procooling:
Graphy thingy
Every block tested does better with higher flow. But notice with some blocks, and perhaps all at higher and higher flow rates, there is a point of diminishing returns.
It all depends on what you consider acceptable, or as you termed it, "works so good."