Quiet One Pumps?

[neonblingbling]

I am getting my feet wet in the water cooling scene (ahaha, what a great pun :-/ ), and wanted to know about this pump:

Quiet One Pumps (http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=9849&Ne=40000&R=7947&Nao=9&N=2004+113041). I was originally looking at the Eheim 1250. 320 gph, max head of 6.5 feet, and is rated at 28 watts. $65 at that place. On the other hand, there is the Quiet One 1200. 296 gph, max head of 6.1 feet, and is rated at 25.5. $25!! Sure, there is less pressure and water flow, but I see less watts.... In my mind, less watts = less energy consumed = less heat and maybe noise. Is it true? :D

[Icedfire]

that amount of heat created by a pump and that is transfered into the water is like .1 C so pump heat should not play any factor in buying a pump

and my .02 cents get a D4... or a mcp 650

[litening]

If you're looking for a cheap, powerful pump, there is also the via aqua 1300. It is rated at 370 GPH and has over 6 feet of head. You can get one at drsfostersmith.com for just over $20.

[Graystar]

In my mind, less watts = less energy consumed = less heat and maybe noise. Is it true? It *CAN* be true, but it's not automatic. You have to research the specs on noise and pump efficiency to see if it's true for the particular pump you are considering.

IT has been my experience that none of the sub $40 aquarium pumps have been able to hold their own against the $70+ pumps. They're noisier and they leak and fail where the better pumps don't. If an exception exist, it hasn't shown up here. That includes the Quiet One.

[Vengance_01]

I would recomend the Dtek C-System 750 pump. plugs into a fan header, preforms just like a Via Aqua 1300 and is only 35$ :D

[gungeek]

Do a search on quiet one pumps. You'll find a thread or 3 where several of us did, but no longer, use them. I'd advise something different unless a noisy pump is OK with you. Spend $10 more and get a mag3 or one of the new CSP750 pumps. Even though I have a 1250, I'm not sure I'd recommend it unless you have space for a large pump. Putting one inside a normal computer case is a challenge; there are better options.

[Cyrix_2k]

that amount of heat created by a pump and that is transfered into the water is like .1 C so pump heat should not play any factor in buying a pump

and my .02 cents get a D4... or a mcp 650
Lets see... My MCP600 which is rated @ 9w (draws more like 12w) dumps 9w of heat into the water according to Cathar... Now it's pretty rare for a proc. to dump 100w of heat into the water so we're talking ~10% of the heat being dumped into the water is due to pump heat in MY loop... Start playing with cheap pump and that 9w quickly becomes 20-30w! That's a significant amount extra heat that must be dissapated in addition to CPU heat.

BTW, pressure (head) is more important than flow in PC Water-cooling with high-resistance blocks like the WW.

[Icedfire]

Cyrix i encourage you to read this article http://www.overclockers.com/articles1088/

here is quote from the bottom of that page

Assuming the pump dumps about 50 watts of heat into the water and the flow rate is 1 gallon/minute (gpm - very reasonable assumptions):

Water has a thermal capacity of 4186J/Kg-C at 22ºC and a density of about 1g/mL

With a flow rate of 1 gpm, that's ~3.75 liters/minute (lpm).

3.75 lpm / 60 seconds= 0.0625 liters or kilograms through the waterblocks per second.

4186 * 0.0625 = 261.625 W/C

So that's 1ºC warmer for every 261 watts; but only 50 watts of heat are present, so:

50 / 261.625 = 0.19ºC

Ergo there is a 0.19ºC difference in water temperature between the inlet and outlet of the pump. This does not mean the water is only 0.19ºC warmer than air - that is an entirely different calculation.

And that's with 50 watts. If you're running a smaller pump, such as the D4, you're looking at about 15 watts.

[neonblingbling]

Thanks so far. I guess I'm not gonna get that for my friend...

Anyways, I'm thinking of designing a water cooling system for him. Gonna make pretty much everything from scratch (as scratch as you can get.... but I'm not making a pump :p ). I was sort of into aquariums before, so looking at pumps isn't too new for me.

I want to beable to cool mainly his CPU, but possibly also the GPU and hard drives. His computer is on a desk, and I was thinking of putting the radiator, and resevor on the ground. Since those two main things would be on the ground, I would have to put the pump down there too.

I am currently trying to design the waterblocks. I am aiming to lower the pressure on it, so I want it to be the same amount of GPH as the pipe.... so more math for me... yay.

[Cyrix_2k]

Cyrix i encourage you to read this article http://www.overclockers.com/articles1088/

here is quote from the bottom of that page
But I never said anything about water temps did I... Remember the CPU doesn't MIGHT heat the water up by ~.5c, but now you're adding an extra ~.1c on... Yeah, that's a big increase percentage wise...

[weapon]

there are really two different Quiet One pumps - there are Pentair Aquatics Quiet One pumps and then there are Rainbow Lifeguard Quiet One pumps. Pentair Aquatics bought Rainbow and promptly ditched the original design of the Quiet One for the new less expensive design.

the RLQO, as opposed to the PAQO, has a bit of a price tag ($100-$150 if you can still find them) but it also moves one helluva lot of water (1140gph at 0' head, 600gph or so at 9 ft of head) and it is built like a stainless steel brick - more than 3/4 of the pump is metal. The RLQO is the pump I use in my main system and I can't really think of another I'd trade it out for unless I just didn't have the space for it. It uses an isolated wet-rotor design that helps prevent heat dump into the coolant and it is likely the quietest pump I have never heard. :D

[Icedfire]

cyrix i m insterested in knowing how you figured out that the cpu only adds ~.5c to the water

[Cyrix_2k]

cyrix i m insterested in knowing how you figured out that the cpu only adds ~.5c to the water
I doubled the heat in the equation you posted above... Instead of 50w, I used 100w so it would heat the water by .38C each pass.