heater core flow direction?

kibbles · 07-30-2003, 12:12 AM

Does it matter if I use the inlet as an outlet (and the outlet as an inlet) on a heater core? Is there a specific designed direction for flow?

bigben2k · 07-30-2003, 08:34 AM

No difference.

CoolROD · 08-01-2003, 10:20 PM

How about a single pass h/c with one tank at the top and another at the bottom. I am putting hot water into the bottom and out the top to help my system bleed. This seems backwards to me WRT natural convection...

bigben2k · 08-01-2003, 10:54 PM

Would you have *zero* airflow, or is there even a single fan at work here?

CoolROD · 08-01-2003, 11:12 PM

It's force cooled - 6" Comair Rotron @ 0-14 VDC w/ custom CNC'd shroud made of aluminum composite material (ACM).

I was talking about the heat gradient of water...If you put hot water into the bottom of the rad. and there is cooler water at the top does the water tend to rise and aid flow? :shrug:

edit: I was hoping you'd chime in...

bigben2k · 08-02-2003, 08:59 AM

Flow by convection is pretty slow: it's strictly based on the different densities of the water at different temps. With a pump, the flow is 100 times faster, and the result is that the temp diff is a couple of degrees, worst case.

You'll have to post a pic of the CNC'd shroud!

MadDogMe · 08-02-2003, 09:53 AM

I'd imagine the 'thermal rise' is a tad bit slower than what the pump is pushing up through the rad anyway (depending on pump of course!)

...

CoolROD · 08-05-2003, 11:40 PM

Thanks for Asking

-Here it is:

http://home.triad.rr.com/rodrunner/Watercooled%20PC.htm

(the site and PC are a work in progress)

Blackeagle · 08-06-2003, 05:43 PM

I don't think you are going to hurt for air flow with that beast of a fan.

How many CFM would you estimate you are getting with it?

BTW, Very nice shroud!

CoolROD · 08-06-2003, 09:43 PM

Thanks! My web page and my HTML experience will have a 1-day anniversary soon.

NOTE: Not Recommended for Dial-Up Users. All pictures were reduced to 800 x 600 pixels and 24 bit color.

Quote:

How many CFM would you estimate you are getting with it?

I have no idea. But, that is a really good question. The fan (not the blower) is rated at 212 cfm @ 12 VDC. It runs fine at 5 VDC but creates little pressure / CFM. I am hoping 8 VDC will run the system. I ordered a 5 Amp 3-terminal regulator (LM338T) for it Monday. $2.11 at Newark -If anybody is interested...

I guess I can run the fan with a manometer around it and read the static pressure -then read the cfm from the chart. If I can find the manometer tomorrow (it may be at a friends race shop) -I will do it! It will be really nice to know and I can check it with the case covers on also.

CoolROD · 08-07-2003, 07:52 PM

I asked around and found out that the manometer is in our building -somewhere. Instead of looking in to this I gathered some more data on my Johnson Pump. I will have some real numbers on the air cfm through my rad. soon.

kibbles -sorry about the hijack. If you intend to give some direction to this thread then I can go elsewhere. It does look like your question got answered to full effect.

redleader · 08-07-2003, 08:40 PM

Quote:

Originally posted by bigben2k
Flow by convection is pretty slow: it's strictly based on the different densities of the water at different temps. With a pump, the flow is 100 times faster, and the result is that the temp diff is a couple of degrees, worst case.

You'll have to post a pic of the CNC'd shroud!

With a 1/2 degree difference between the top and bottom of the core I'd say its many thousands of times slower then the pump. Maybe tens of thousands.

Water barely expands at all when heated and thus is almost uneffected by convection at the temperature differences and distances were're concerned with.

07-30-2003, 12:12 AM	#1
kibbles Cooling Neophyte Join Date: May 2003 Location: Colorado Posts: 27	heater core flow direction? Does it matter if I use the inlet as an outlet (and the outlet as an inlet) on a heater core? Is there a specific designed direction for flow? __________________ MSI K7D Master, 2x1800XP

07-30-2003, 08:34 AM	#2
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	No difference. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

08-01-2003, 10:20 PM	#3
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	How about a single pass h/c with one tank at the top and another at the bottom. I am putting hot water into the bottom and out the top to help my system bleed. This seems backwards to me WRT natural convection... __________________ Jack of all Trades, Master of None.

08-01-2003, 10:54 PM	#4
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Would you have zero airflow, or is there even a single fan at work here? __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

08-01-2003, 11:12 PM	#5
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	It's force cooled - 6" Comair Rotron @ 0-14 VDC w/ custom CNC'd shroud made of aluminum composite material (ACM). I was talking about the heat gradient of water...If you put hot water into the bottom of the rad. and there is cooler water at the top does the water tend to rise and aid flow? :shrug: edit: I was hoping you'd chime in... __________________ Jack of all Trades, Master of None.

08-02-2003, 08:59 AM	#6
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Flow by convection is pretty slow: it's strictly based on the different densities of the water at different temps. With a pump, the flow is 100 times faster, and the result is that the temp diff is a couple of degrees, worst case. You'll have to post a pic of the CNC'd shroud! __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

08-02-2003, 09:53 AM	#7
MadDogMe Thermophile Join Date: Aug 2002 Location: Just shut up ;) ... Posts: 1,068	I'd imagine the 'thermal rise' is a tad bit slower than what the pump is pushing up through the rad anyway (depending on pump of course!) ...

08-05-2003, 11:40 PM	#8
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	Thanks for Asking -Here it is: http://home.triad.rr.com/rodrunner/Watercooled%20PC.htm (the site and PC are a work in progress) __________________ Jack of all Trades, Master of None.

08-06-2003, 05:43 PM	#9
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	I don't think you are going to hurt for air flow with that beast of a fan. How many CFM would you estimate you are getting with it? BTW, Very nice shroud!

08-07-2003, 07:52 PM	#11
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	I asked around and found out that the manometer is in our building -somewhere. Instead of looking in to this I gathered some more data on my Johnson Pump. I will have some real numbers on the air cfm through my rad. soon. kibbles -sorry about the hijack. If you intend to give some direction to this thread then I can go elsewhere. It does look like your question got answered to full effect. __________________ Jack of all Trades, Master of None.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)