How much heat a pump adds to water

ambient · 06-01-2002, 10:28 AM

Well for a little test last night, i hooked up my system with just the rad, res, and pump (I don't have a block yet.) And for those of you who thought more flow bigger pump is better, hmm.... it adds A LOT of heat to the water. Here is what I found

All temps were taken with dd5

setup is danner mag 5 rated 500gph @ 0 foot head.
4x4x6 underground electrical box for res, w/ probe mounted in it.
Black Ice Extreme w/ sunon 86cfm 120mm shrouded @ 12v.
1/2" vinyl
bout 3 quarts of tap filled system with about 1 cup anti freeze.

ambient 24c - 23c
pump left on over night without rad fan on water temp = 38c this morning.
with rad fan on 25c

scythe · 06-01-2002, 11:23 AM

i know even without a submerged pump you still get your water heated , when i was testing for leaks in my system after about an hour or two i could feel the radiator was kinda hot from the water.

FRAGN'STIEN · 06-01-2002, 12:50 PM

So whats better? Submerged or inline? I know that the pump heats the water when submerged but wouldn't the pump be cooled by the water also. And doesn't the water get heated traveling through an inline pump?

ambient · 06-01-2002, 01:03 PM

Quote:

So whats better? Submerged or inline? I know that the pump heats the water when submerged but wouldn't the pump be cooled by the water also. And doesn't the water get heated traveling through an inline pump?

I really don't know. I think both will give about the same results or the pump being submerged would be a little hotter. I also have a vantec 80mm 27cfm 21dba fan blowing directly on the pump. Oh yeah my setup is hybrid. The pump runs inline.

ambient · 06-01-2002, 01:05 PM

also forgot to mention, there is no computer in the case. I have an AT psu that i'm using to power the fans and the dd5.

Brad · 06-01-2002, 06:59 PM

you have to bear in mind you had no fan on your rad which is fairly unrealistic. put your fan on, then see what the temps are

ambient · 06-02-2002, 12:12 AM

not to be an @$$ but

Quote:

ambient 24c - 23c
pump left on over night without rad fan on water temp = 38c this morning.
with rad fan on 25c

The point of the post was to show how much heat was added to the water by the pump. Of course once I get a block and my system setup, I will be running it with the rad fan on.

Brad · 06-02-2002, 12:28 AM

hehe, I did see that, I was just pointing out I felt it was unrealistic.

ambient · 06-02-2002, 12:45 AM

yeah it was totally unrealistic. I was just curious and I haven't bought a block yet. So I hooked it up with just the rad, pump, and res to see how well the blx would fair.

Cyco-Dude · 06-02-2002, 12:47 AM

methinks on most setups, when run w/o a rad fan on, the water will get quite warm unless you're using a weak pump. even the lower GPH Ehiem would probably heat it up good (although probably not as much as the higher GPH models...)

redleader · 06-02-2002, 01:12 AM

Quote:

The point of the post was to show how much heat was added to the water by the pump. Of course once I get a block and my system setup, I will be running it with the rad fan on.

Also not to be an ass but then you shouldn't have used a rad, then we could have calculated the effect of the pump on the coolant. All we know now is that the coolant is heated to some extend by the pump.

ambient · 06-02-2002, 01:20 AM

Quote:

All we know now is that the coolant is heated to some extend by the pump.

that was the point.

Nordic · 06-02-2002, 05:54 AM

I tried leaving my setup over night for leak testing before I first installed it and the water temp was about 5 degrees C above ambient in the morning, but the Eheim 1048 ain't a 500 gph pump.. 600 l/h corresponds to 120-130 gph ? (I feel sorry for those not using the metric system

)

With the fan on and the system installed in the case, I only had at most one degree above ambient. It's time to replace my puny rad soon and this issue will be even more moot.

bigben2k · 06-02-2002, 09:52 AM

Quote:

Originally posted by FRAGN'STIEN
So whats better? Submerged or inline? I know that the pump heats the water when submerged but wouldn't the pump be cooled by the water also. And doesn't the water get heated traveling through an inline pump?

It's not so much a matter of cooling the pump, as it is about getting a pump that doesn't require the extra cooling.

An Eheim will work very well, submerged or not.

A submerged pump will dissipate ALL of its heat in the water.

Some numbers...
I've seen written that the Eheim 1048 (in-line) will dissipate 7W of heat in the water (true???). Either way, the point is that if you're trying to cool a 70W CPU, then you just degraded the performance by 10%. It's a reality, and there isn't much we can do about it, except by staying away from submerged pumps.

On the other hand, if you use a very small submerged pump (probably because you have a space restriction), then it'll do very well.

An alternative to eliminate this factor, would be to run an air vacuum to circulate the water, but that's complicated and more likely to be very big.

06-01-2002, 10:28 AM	#1
ambient Cooling Savant Join Date: Jan 2002 Location: Planet Earth Posts: 312	How much heat a pump adds to water Well for a little test last night, i hooked up my system with just the rad, res, and pump (I don't have a block yet.) And for those of you who thought more flow bigger pump is better, hmm.... it adds A LOT of heat to the water. Here is what I found All temps were taken with dd5 setup is danner mag 5 rated 500gph @ 0 foot head. 4x4x6 underground electrical box for res, w/ probe mounted in it. Black Ice Extreme w/ sunon 86cfm 120mm shrouded @ 12v. 1/2" vinyl bout 3 quarts of tap filled system with about 1 cup anti freeze. ambient 24c - 23c pump left on over night without rad fan on water temp = 38c this morning. with rad fan on 25c __________________ water cooled 1.4 tbird @ 1580 143x11 vcore 1.88 vio 3.55

06-01-2002, 11:23 AM	#2
scythe Cooling Neophyte Join Date: Feb 2002 Location: fp , michigan Posts: 76	i know even without a submerged pump you still get your water heated , when i was testing for leaks in my system after about an hour or two i could feel the radiator was kinda hot from the water. __________________ ...[-_-]... +-{ i }-+ ....[][].....

06-01-2002, 12:50 PM	#3
FRAGN'STIEN Cooling Savant Join Date: May 2002 Location: Rathdrum, ID Posts: 380	So whats better? Submerged or inline? I know that the pump heats the water when submerged but wouldn't the pump be cooled by the water also. And doesn't the water get heated traveling through an inline pump? __________________ This space for rent

06-01-2002, 01:05 PM	#5
ambient Cooling Savant Join Date: Jan 2002 Location: Planet Earth Posts: 312	also forgot to mention, there is no computer in the case. I have an AT psu that i'm using to power the fans and the dd5. __________________ water cooled 1.4 tbird @ 1580 143x11 vcore 1.88 vio 3.55

06-01-2002, 06:59 PM	#6
Brad Thermophile Join Date: Oct 2001 Location: Nuu Zeeelin Posts: 3,175	you have to bear in mind you had no fan on your rad which is fairly unrealistic. put your fan on, then see what the temps are __________________ 2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans 2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water

06-02-2002, 12:28 AM	#8
Brad Thermophile Join Date: Oct 2001 Location: Nuu Zeeelin Posts: 3,175	hehe, I did see that, I was just pointing out I felt it was unrealistic. __________________ 2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans 2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water

06-02-2002, 12:45 AM	#9
ambient Cooling Savant Join Date: Jan 2002 Location: Planet Earth Posts: 312	yeah it was totally unrealistic. I was just curious and I haven't bought a block yet. So I hooked it up with just the rad, pump, and res to see how well the blx would fair. __________________ water cooled 1.4 tbird @ 1580 143x11 vcore 1.88 vio 3.55

06-02-2002, 12:47 AM	#10
Cyco-Dude Cooling Savant Join Date: Feb 2002 Location: Dayton, Ohio Posts: 836	methinks on most setups, when run w/o a rad fan on, the water will get quite warm unless you're using a weak pump. even the lower GPH Ehiem would probably heat it up good (although probably not as much as the higher GPH models...)

06-02-2002, 05:54 AM	#13
Nordic Cooling Neophyte Join Date: Mar 2001 Location: Umeå, Sweden Posts: 98	I tried leaving my setup over night for leak testing before I first installed it and the water temp was about 5 degrees C above ambient in the morning, but the Eheim 1048 ain't a 500 gph pump.. 600 l/h corresponds to 120-130 gph ? (I feel sorry for those not using the metric system ) With the fan on and the system installed in the case, I only had at most one degree above ambient. It's time to replace my puny rad soon and this issue will be even more moot. __________________ Pump:Eheim 1048, Radiator:LPD radiator 100x150x20mm, CPU block:DD Maze-2, GPU block: DD GPU block, Chipset block:Zalman NB32 AMD XP 1500+, EpoX 8K7A, PoV GF3Ti200 Pic of my YY-cube

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