Section A - Cooling System, continued.....

Subject: Re: u s radiators Date: Sun, 30 Aug 1998 16:01:35 +0100 From: ritchie@mcn.org (Armand & Lorie Ritchie) To: Steve Laifman , tigers@autox.team.net


try this address:(http://www.usradiator.com/default.htm) it just worked for me. regards Armand
ritchie@mcn.org Armand & Lorie Ritchie
Subject: Re: u s radiators Date: Sun, 30 Aug 1998 17:40:46 +0100 From: ritchie@mcn.org (Armand & Lorie Ritchie) To: Steve Laifman

Steve, I'm glad the link finally worked. I apologize for not posting it in the proper manner. I'm a novice computer user. The info about your mustang was most timely, as a friend just received a 72 mach 1 from his wife for his 50 birthday. And it has been overheating. So I will pass on your info about radiators. I was dismayed by the comments of Dick Barker today on the list, I for one appreciate your astute observations, insights and levity and those of our other learned list members. Keep up the good work regards Armand
ritchie@mcn.org Armand & Lorie Ritchie

Subject: Re: u s radiators Date: Sun, 30 Aug 1998 15:36:51 -0500 From: befarkas@ncsu.edu (Brian E. Farkas) To: tigers@autox.team.net

Hi Gang, I don't get to write in very often as I don't (as yet) have a Tiger, but in the area of heat transfer, fluid mechanics, and heat exchangers I can contribute!
The comment on the triple pass radiator that "I have never heard an explanation" prompted me to write in. While I haven't actually seen one of these rascals the comment that "it works very well but may require excessive water pump pressure" and "a two-pass... leaves the outlet and inlet on the same side" leads me to believe that the design concept would be similar to "stacking" multiple single pass radiators and plumbing them in serial with the hot fluid coming in the back most radiator and the coolest fluid leaving out the front radiator.
The amount of heat transfered from a given heat exchanger (such as a radiator) is proportional to the area available for contact between the hot fluid and the cooling media. So, as the number of passes increases so does the surface area and thus heat removal ability. In addition to surface area, the heat transfered is also a function of the temperature difference between the hot and cold fluids at the inlet and exit. This is not a simple average temperature (as they are changing from the inlet to outlet) but a "log-mean" temperature difference...suffice to say that a bigger temperature difference will lead to increased heat transfer. Therefore the design mandates that (hopefully) the hot fluid enters at the back most pass where the air is now hot but the temperature differece remains large and the coolest fluid leaves at the front where the air is the coolest thus, again, giving the biggest temperature difference. The last variable in this calculation is the velocity of the two fluids (in our case air and cooling fluid). Higher velocity of each leads to increased heat transfer by several mechanisms that I will spare you from hearing about (Lecture # 37!).
Hope the above rattle is helpful. If you have questions let me know. I love this stuff!
Brian Farkas Tiger owner someday! and Assistant Professor, Process Engineering NC State University


At 11:58 AM 8/30/98, Bob Palmer wrote: >Armand, Lorie, et Listers, > >I couldn't access this site, but with regard to a triple-pass radiator, >this is certainly not a new concept. I first saw this type of radiator in >the mid '70s, and they probably weren't new even then. I have never heard >an explanation I believed about why double or triple pass would be better. >I had a long conversation with Ron Davis (aluminum racing radiator builder) >about the multiple pass concept and he believes that two is better than >one, but three is too much. This I am sure of, a three pass radiator has >NINE TIMES ( that's 9X) the flow resistance of a single pass radiator. If >you try using a garden hose to run water through a three-pass, you'll >quickly see what I mean. I ended up getting a three-pass from Ron, but am >not convinced I did the right thing; would have preferred a two-pass, but >that leaves the outlet and inlet on the same side so it requires some >modifications to the hoses and water pump. At the very least, a three-pass >needs a good water pump that will provide enough pressure to ensure good >flow, especially at low rpms. I got my water pump from Sunbeam Specialties >and it seems to do a good job. In fact, I drilled a 1/8" hole in the >thermostat and even this small hole allows enough flow to keep it running >well below the thermostat regulation temp (195 F) most of the time. > >Bob > >At 10:35 AM 8/30/98 +0100, Armand & Lorie Ritchie wrote: >>Hi all I just checked out a neat web site (www.usradiators.com) they have a >>novel concept of radiator design. Triple flow which they claim is the most >>efficient. the radiator is made with three separate chambers that the >>coolant must travel through. They do customs and hotrods also sports cars. >>You can submit a drawing and they will give you a quote on price. >>Interesting site. >>regards Armand Ritchie >> >>ritchie@mcn.org >>Armand & Lorie Ritchie >> >Robert L. Palmer >Dept. of AMES, Univ. of Calif., San Diego >rpalmer@ames.ucsd.edu >rpalmer@cts.com

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