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Author: Subject: pontoon radiators... parallel or series ?
drt

posted on 4/3/16 at 01:39 AM Reply With Quote
pontoon radiators... parallel or series ?

Hi LCB'ers,
Keeping the building blog clean I'll ask it over here...

For my exoskeleton I was planning on using 2 rads, 1 in each pontoon.
Short question, long answer...

run them parallel or series ?

what are your opinions ?

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Brook_lands

posted on 4/3/16 at 07:27 AM Reply With Quote
Parallel will give greater cooling all other things being equal.
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02GF74

posted on 4/3/16 at 07:32 AM Reply With Quote
Dont know answer but to consider.
Parallel cant guarantee equal flow but best for cooling as more heat transferred due to larger temp difference between water and air.

Series guarantees equal flow but increase in resiistance so pump works harder, less efficient as one rad is cooler.

Hmmmm. .worth googling to see whats been done, you are not the first to do this.


Im temped to say parallel if you can keep plumbimg very similar to both rads.





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nick205

posted on 4/3/16 at 09:44 AM Reply With Quote
A thought, do Ariel have rads this way in their Atom? If so it would be worth seeing how they've done it.

There was a chap on here who built a car very similar to an Ariel Atom (called it a Mota Liera IIRC). He might have some real world input for you.






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motorcycle_mayhem

posted on 4/3/16 at 09:48 AM Reply With Quote
Both the Jedi and Dallara run radiators in series, both installations have been trouble free for me.
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loggyboy

posted on 4/3/16 at 10:15 AM Reply With Quote
quote:
Originally posted by nick205
A thought, do Ariel have rads this way in their Atom? If so it would be worth seeing how they've done it.

There was a chap on here who built a car very similar to an Ariel Atom (called it a Mota Liera IIRC). He might have some real world input for you.


Are you thinking or the Warner R4?






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40inches

posted on 4/3/16 at 10:40 AM Reply With Quote
May be some info on the MotaLiera thread here? http://www.locostbuilders.co.uk/viewthread.php?tid=70837
Perhaps not! He mounted the rad on the front
Description
Description


[Edited on 4-3-16 by 40inches]

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Sam_68

posted on 4/3/16 at 11:01 AM Reply With Quote
I'd go with series - I wouldn't trust the flow on parallel. Might be more difficult to chase out airlocks on a parallel system, too.
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wylliezx9r

posted on 4/3/16 at 12:00 PM Reply With Quote
Another vote for series. Without some sort of valve arrangement how could you guarantee the flow ?

Edit to say: Do you definitely need 2 radiators ?

[Edited on 4/3/16 by wylliezx9r]





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bi22le

posted on 4/3/16 at 07:40 PM Reply With Quote
I would also have the closest one as the last one so the water is super cool with only a short journey back.





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drt

posted on 4/3/16 at 08:40 PM Reply With Quote
thanks for the opinions :p

I didn't even think of the the trapped air problem
What concerns met most is if the standard water pump could cope with the added drag and delay...
it would take longer for the flow to react upon the change in thermostat opening ?

Oh, I'm going with the Atom V8 setup, with the small pontoons.
Damn, MotaLiera has the original nose cone :p that would have saved me soooo much work

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drt

posted on 4/3/16 at 08:46 PM Reply With Quote
Well I know most of you run a single polo radiator on real powerhouses
And claim it goes alright :p
But in theory my 2l turbo will need to dissipate far more than 1 1000cc rad...
Ok, as they are completely in the flow that might be alright...
but on a spring day hammering around a track ?
or creeping in the traffic jam... more likely

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cloudy

posted on 4/3/16 at 10:42 PM Reply With Quote
If it helps, I originally built the R4 with two series rads and didn't have issues, there wasn't a noticeable difference in temp across them...
James

[Edited on 4/3/16 by cloudy]





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drt

posted on 7/3/16 at 05:42 PM Reply With Quote
quote:
Originally posted by cloudy
If it helps, I originally built the R4 with two series rads and didn't have issues, there wasn't a noticeable difference in temp across them...
James

[Edited on 4/3/16 by cloudy]


So you did not receive any gain from a double rad set up?

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coyoteboy

posted on 8/3/16 at 11:43 AM Reply With Quote
Personally I'd run parallel and just make sure the two routes were similar flow characteristics - ie same number of bend and diameter, the flow variation across the two will be negligible - it's not like if one rad has 95% of the resistance it will take all the flow.

I'd rather two rads working at high efficiency than have to carry two larger than needed rads because one is trying to cool already cool water. The bigger question is how are you picking sizes?





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02GF74

posted on 8/3/16 at 05:53 PM Reply With Quote
quote:
Originally posted by cloudy
If it helps, I originally built the R4 with two series rads and didn't have issues, there wasn't a noticeable difference in temp across them...
James




Was this measured at high speed or with car idling and fans on? There is significantly less heat remove with the latter.

I was runnig my v8 land rover with cap off and as soon as the large electric fan kicked in, the water in the header disappearrd within seconds which surprised me. I didnt do the calc but would expect about 10 deg difference between in and out water temps for that reduction in volume.

Parallel is better but series is safer. Looking over the web at both set ups, i didnt spot anybody reporting issues with either.

Let us kniw how you get on.

Is there not an option if fitting single alloy radiator with additional core(s)?





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daniel mason

posted on 8/3/16 at 06:05 PM Reply With Quote
They were in series on my Jedi until I pulled one out to save weight!
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