Keeping Cool

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Re: Keeping Cool

Postby nitroman » Sun 15.02.2009, 08:34

surferphil wrote:My solution is to get a white hood or line the one you have with some sort of insulating material. There is a really good product used in loft insulation which looks like fabric wadding with a foil layer (quite thin). It's safe to handle and doesn't break up - unlike older insulation material.

My AC used to work well, but the gas was replaced with the new wonder stuff and now it's useless! :evil: :roll:

This should have occured to me before, but I had a reminder today. I was under a friend's Porsche Boxster and saw that the A/C condenser had its own dedicated cooling fan. I should have remembered that I 1st saw that occur on a 1993 Eagle, which was one of the Chrysler H-body cars. The important thing is this, all R134a cars I know of have an electric fan mounted directly on the condenser which runs whenever the A/C is on. The need to have cool air run through the condenser fins is not adequately served by radiator-mounted cooling-fans sandwiched one layer behind the A/C condenser, even though that was wholly sufficient when using R12.

There is plenty of room to mount a PUSHER electric fan on the Elan's A/C condenser. I am not sure what the vertical dimension of the condenser is, or even if the USA & ROW condensers are the same though. It would be most advantageous to mount 2 fans set diagonally across the length of the condenser, if you wish to cover the highest percentage of surface area. I will investigate when I get the cajones to pull stuff apart & fit my new lower radiator-bracket!
Strive for perfection in everything. (given time)
Take the best that exists & make it better. (given inclination)
If it doesn't exist, create it. (God did)
Ignore what I say. (good advice)
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Re: Keeping Cool

Postby nitroman » Tue 17.02.2009, 02:02

Measured insitu (not easy) the A/C condenser appears to be about 8.25" tall and 26.5" long. At the top (in the USA version) it narrows down to very little room available in front. Safely, I would only try to use a 7" fan, but even assuming an 8" could be fitted, there is still room to place 3 fans on the condenser. That would draw a lot of amps!

One other thing to consider: I have fans with curved blades (Maradyne) on one car, and stock straight-blade fans on the other car. Curved blades cut the air more smoothly, in the same way a swept-wing on a high-speed aircraft does. What this accomplishes on a car is a far quieter fan, as the outer-blade tips, which are rotating at a faster speed than any other part of the blade, are not forced to slice the air directly at a right-angle. Rather, the initial contact is made by a part of the blade which is rotating more slowly, farther inside the swath diameter.

If you peruse OEM rad-fans, you'll notice that ones from the last 5-years or so are all becoming "curved," in the never-ending battle against NVH.
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Strive for perfection in everything. (given time)
Take the best that exists & make it better. (given inclination)
If it doesn't exist, create it. (God did)
Ignore what I say. (good advice)
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nitroman
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Joined: Fri 18.04.2003, 01:17
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