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There is no data (that I know of) that shows what the minimum acceptable
flow at any given power level is. But the laws of thermodynamics are very
unambiguous: Faster is better.
Tracy (hoping this does not result in a quest for 100 GPM flow
rates)
I
seem to have missed a lot of posts. When I'm going to be out of town
for more than couple of days I stop the list. That could explain
some
of it. 12 GPM and 34 GPM is a pretty wide window of stuff that
apparently works. 34 is like cycling your whole coolant supply
through
the system every 4 seconds or so. That just seems really
really fast to
me. It was 40+ years ago last time I studied this
stuff, so all I've
got is intuitive guesses.
Which is, of course,
exactly what I keep complaining about :o) ... Jim S.
Bob White
wrote:
>Hi Jim,
>
>Bill Schertz has made the acutal flow
measurements by driving his EDWP
>with an electric motor. The EDWP
can push 34 GPM thru two parallel
>evaporator cores at 5600 rpm.
Todd Bartrim is seeing over 9 gpm with an
>EWP (Davies- Craig) only
system (but that was at 12 V). I have measured
>the flow in my
engine with two EWP (Meziere WP136) and two GM evap
>cores at
about 11-12 GPM. I have "calculated that a WP336 should give
>me
about 16 GPM.
>
>That sums up the measurements I know about.
I have just about decided
>to get the WP336 and run my system on 16
GPM. I am a little cautious
>about the 12 GPM flow even though
Todd is doing OK with less. Living
>in New Mexico, I might
encounter harsher conditons. :)
>
>Bob W. (Working hard at
collecting hard data.)
>
>
>On Sun, 20 Mar 2005 14:40:46
-0600
>Jim Sower <canarder@frontiernet.net>
wrote:
>
>
>
>>Wasn't someone talking about
the 12-16 GPM his EWP was pumping through his [not running, no EDWP]
engine? Assuming 2-3 gal capacity, that circulates every bit of
coolant through the system 5 or 6 times per minute. That's an entire
cycle of coolant every 10 seconds or less. That sounds pretty fast to
me.
>>
>>Does anyone actually know what the flow through a
rotary is with EDWP? I mean, like measured (the other list can be relied
upon to calculate stuff). Just as important, does anyone actually know
how far open/closed a thermostat is in our applications. I know some
folks don't have thermostats installed. Is it possible that EDWP might
be circulating coolant so fast it doesn't have time to cool off much in the
radiator or heat up much in the block? That the same system would work
as well at lower flow? Or something like that?
>>
>>It seems to me that all this quibbling about Beemer
power levels on the autobahn ignore the obvious fact that as Leon has
attested, EWP works quite well on the race tracks of Oz. I would hazard
a guess that the stress on the system (WOT nearly all the time, maybe 1/3 the
Q through the cooling system, SL summer temps rather than cruising much faster
(3x the Q) at 80% at much higher/cooler altitudes) would hold a lot more water
than a bunch of Beemer marketing brochures.
>>
>>The other
list is forever making pronouncements about what will or will not work.
Their math is impeccable. The premises they operate from are not
Is it not possible that we are overlooking or underemphasizing some important
factor? That the hybrid (EWP and EDWP) systems we have online now are
distorting the data? Leon's experience cannot ignore any of the
factors. Our estimates can ignore as many as we want to (or are unaware
of). I can't help but think that a little morel hard data gathered from
a purely EWP system will put a lot of the controversy to
rest.
>>
>>A flawless line of reasoning, based on a false
premise leads us right through the lookin' glass ...
>>Jim
S.
>>
>>
>>Leon wrote:
>>
>>----- Original Message -----
>>From: Al
Gietzen
>>To: Rotary motors in aircraft
>>Sent: Sunday,
March 20, 2005 5:45 PM
>>Subject: [FlyRotary] Re: BMW and
EWP
>>
>>
>>
>>
>>In a message
dated 3/18/2005 11:24:08 PM Pacific Standard Time, ALVentures@cox.net
writes:
>>
>>Let’s say the rated hp is at 4800
rpm. The only time you approach rated power with this car is WOT at 4800 rpm
at sealevel on a 60F day. How long would you ever sustain that
condition.
>>
>>Al
>>
>>Al, How about
100mph for 20 minutes on the
autoban?
>>
>>Bill
>>
>>
>>
>>Ah-h-h-h; you’re getting close now.
That‘s probably about 80% power. But you’d probably
have to stop once to pay a toll, and slow down for the Opal that’s
driving in the left laneJ. Or maybe they don’t sell the EWP
version in Germany.
>>
>>
>>
>>All
>>
>>
>>
>>>> Homepage: http://www.flyrotary.com/
>>>>
>>>>
>>>> Archive: http://lancaironline.net/lists/flyrotary/List.html
>>>>
>>>>
>
>
>
>
>> Homepage: http://www.flyrotary.com/
>>
Archive: http://lancaironline.net/lists/flyrotary/List.html
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