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Date: Thu, 29 Oct 2009 21:12:43 -0400
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From: "Colyn Case at earthlink" <colyncase@earthlink.net>
References: <list-3904111@logan.com>
Subject: Re: [LML] Re: Battery cooling 4P
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Bob have you ever measured the temp of the air coming out of the oil cooler?
My guess it's going in at 20 dF above ambient and comes out 70 dF above 
ambient.
If your oil cooler can raise the air temp to the oil temp it's an extremely 
efficient device!

On the other hand, the turbo and wastegate are making a lot of radiant heat 
just below
Ralf's (and my) standby battery box.      That I have not measured.

----- Original Message ----- 
From: "Robert Pastusek" <rpastusek@htii.com>
To: <lml@lancaironline.net>
Sent: Thursday, October 29, 2009 9:21 AM
Subject: [LML] Re: Battery cooling 4P


> Ralf B wrote:
>
> Dear subscribers,
>
> I moved my battery location from the trunk in front of the firewall.
>
> I got a TISO550 with an AC compressor on it. The only empty spot that I
> found on the firewall was behind the oil cooler. Based on Jeff's advice
> I am using 2 12V batteries and stack them on top of each other. I made
> an aluminum box that holds both batteries. The box has cut outs on all
> sides for weight reduction and that air can get to the batteries.
>
> Question: the exiting air of the oil cooler will hit the batteries
> through the big cut out in my battery box. Is this a problem?
>
> I could make a thin cover out of carbon and shield the battery.
>
> Is it necessary to run a cooling hose from the baffling to the battery
> and cool it?
>
> Thanks for your help
>
>
> Ralf,
> Some information and recommendations, but reluctant to dictate what you
> should do.
> I'd definitely shield the batteries from oil cooler exhaust. The oil 
> coming
> out of my oil cooler (Lancair IV-P with TSIO-550E) goes to 200 degrees on 
> a
> hot day climb. I suspect the air exiting this heat exchanger is probably
> pretty close to this temperature--but have not measured it. If you're 
> using
> wet cell batteries, this is well high enough to evaporate (but not boil) 
> the
> liquid at a high rate.
>
> I do have temperature monitors just above each exhaust stack and just
> forward of the firewall. I have never seen the temp there above 150 
> degrees;
> normally it's around 120-130. Again, I have not measured the temp in your
> specific battery location, but I'd think the above temps are 
> representative;
> perhaps a bit high because of their close proximity to the exhaust pipes. 
> In
> any case, my two (12v in series) Odyssey 680 batteries have worked without 
> a
> problem at all in the "normal" battery location...upper right front of
> firewall. They are in a closed box, without any external cooling.
>
> Hope this helps?
>
> BOB
>
>
>
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