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<p>Ken: Have you tried these guys?? I use them a
lot...https://www.apairinc.com/<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 6/18/2021 8:09 AM, Ken Knierim
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACLRkAJfTuXcPz5kQxWdGgRtvAPB=P3xdSgBWdX2wL8VxHqq4Q@mail.gmail.com">
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<div>I got a $20 handheld anemometer from Amazon I use for
measuring airflow now. Takes the guesswork out of it. I got it
when my son built a wind tunnel project for school and now I
use it when working on cooling calculations for my RF
generators. Well, that and my pawn-shop FLIR camera. Now you
can get a FLIR add on for a cell phone too. I got the FLIR
when I was working on a 200kW RF system and for some reason I
didn't want to put my hand in it to see where the hotspots
were. Handy tools. :)</div>
<div><br>
</div>
<div>Now I'm trying to figure out how to upgrade my old R-12
based R4 compressor to a more modern and efficient Sanden
compressor on my 86 Blazer. Of course it worked when it was
cooler but now that we're in the mid teens it's not keeping
up. Around 118 and I had 90 degree air coming out. bleh.
Already upgraded the fan clutch to the big-block version and
that helped but that was before the heat got here.<br>
</div>
<div><br>
</div>
<div>Ken in AZ<br>
</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jun 18, 2021 at 5:46
AM Cecil Bearden <<a href="mailto:crbearden@copper.net"
moz-do-not-send="true">crbearden@copper.net</a>> wrote:<br>
</div>
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0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p>Steve:</p>
<p>I remember all that and had to work with it in hydrology
and flow calculations for the last 40 years. However for
the last 10 I have had a computer program available that
does all that stuff and all I have to do is plug in some
numbers. Back when I was approving plans for new
construction, I could look at an applications, the
spillway size and the location and ddo it in my head....<br>
Cecil<br>
</p>
<div>On 6/18/2021 4:55 AM, Stephen Offiler wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">I haven't done flow calculations in a long,
long time, and Fluids was not among my favorite subjects
back in school... so with that said, my gut feeling is
that Mark's 56% blockage is probably somewhere in the
right ballpark but dependent on factors like whether the
airflow is laminar or turbulent, maybe Reynold's
numbers.... now I'm just spewing stuff I learned 40
years ago. Mostly to say, there might not *be* a good
way to calculate this outside of a lab with a flow
bench; really, the thing to do is try it, and take
measurements. No idea if you can see high-side pressure
while on the road but I doubt it. Any readouts for
coolant or trans temperatures?
<div><br>
</div>
<div>SO</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jun 18, 2021
at 1:03 AM magreer67 <<a
href="mailto:magreer67@gmail.com" target="_blank"
moz-do-not-send="true">magreer67@gmail.com</a>>
wrote:<br>
</div>
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0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="auto">
<div dir="auto">Wouldn't that be 56% blockage and
44% open to flow through?</div>
<div dir="auto">Mark Greer</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div
id="gmail-m_3390274285365035188gmail-m_-202123088828031218composer_signature"
dir="auto">
<div style="font-size:85%;color:rgb(87,87,87)"
dir="auto">Sent from my Verizon, Samsung Galaxy
smartphone</div>
</div>
<div dir="auto"><br>
</div>
<div><br>
</div>
<div dir="auto"
style="font-size:100%;color:rgb(0,0,0)"
align="left">
<div>-------- Original message --------</div>
<div>From: Cecil Bearden <<a
href="mailto:crbearden@copper.net"
target="_blank" moz-do-not-send="true">crbearden@copper.net</a>>
</div>
<div>Date: 6/17/21 11:34 PM (GMT-05:00) </div>
<div>To: <a
href="mailto:at@lists.antique-tractor.com"
target="_blank" moz-do-not-send="true">at@lists.antique-tractor.com</a>
</div>
<div>Subject: Re: [AT] Airflow calculations of
perforated metal for radiator screens </div>
<div><br>
</div>
</div>
<p>The .188 diameter staggered pattern gives .444
sqin hole area over a 1 sq in area. So I guess it
would result in a 44% blockage. However it would
be tabout 5 inches from the grille and then the
A/C condensor sets about 6 inches back from that.
I think there would be sufficient room to pull air
from above and below. It just may cause some
additional drag at high speeds. I think I will
try it and make it easy to remove in case it
blocks too much airflow. I have to do something.
Time and ability to work on this stuff gets more
valuable daily...<br>
Cecil<br>
</p>
<div>On 6/17/2021 7:48 PM, Brad Loomis wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">The 455 diesel lawn tractor I use
at work has a pull out screen ahead of the
radiator. I'm not there so I can't measure it.
But I will try tomorrow and report back. It does
keep the foxtails, thistle, mustard, and
whatever else I kick up out of the radiator.
<div>Brad</div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Thu, Jun
17, 2021 at 5:23 PM Cecil Bearden <<a
href="mailto:crbearden@copper.net"
target="_blank" moz-do-not-send="true">crbearden@copper.net</a>>
wrote:<br>
</div>
<blockquote style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex"
class="gmail_quote">I had to wash the A/C
condensor and radiator out on my 2011 Chevy
truck <br>
yesterday before I could make a trip to pick
up some auction items. I <br>
put the gauges on my a/c system and it showed
35 low and 350 high. <br>
before I did anything I went to the water hose
and got it down to 150 <br>
pretty quickly on the high side. The amount
of bugs was crazy. I will <br>
have to remove the radiator and condensor to
get them clean as there is <br>
no room to get anything in the front or behind
the fan. I have one of <br>
those heavy cowcatcher style grill guards in
the front. This truck has <br>
about 170K miles and has made 3 trips to
Alaska, so it may have more <br>
bugs than usual, but the bugs and thi8stle
seeds are terrible here and <br>
getting worse. I want to put a piece of
perforated metal behind the <br>
grill guard to catch the bugs. If it cuts the
air down, it can still <br>
come in between the screening and the grill.
I don't think it will make <br>
a lot of difference in the amount of air
entering the radiator, but <br>
maybe catch the bugs and fluffy crap in the
air... When we figure <br>
airflow into a home, we cut the flow through a
window in half when a <br>
screen is used. I am looking at a peforated
metal with holes .188in <br>
in diameter and offset centers so it gets the
most holes per square <br>
inch. Does anyone have any experience with
this type of screening or <br>
have a formula to determine if it will cut the
airflow too much. I think <br>
the area behind the grill guard and the grill
is wide enough to keep <br>
from cutting down the air flow. Traveling
down the road at 60mph it may <br>
deflect some air around the grill instead of
through..<br>
<br>
I just don't want to have to remove this
radiator again. I have to use <br>
a stepladder to work on the d&%$^d thing
it is so tall. It is stock for <br>
that year, but the manufacturers want to see
how far the drivers can <br>
jump to get into a pickup nowdays. I remember
a 63 and 66 chevy 1/2 ton <br>
pickup we worked out of on the farm every
day. Hauled 20 head of cows <br>
in a bumper trailer with no brakes into OKC
Stockyards. Loaded 60 <br>
bushels of wheat to haul to the elevator when
the lines were long and <br>
the grain truck had not returned. Now, I have
a 3/4 ton that I have to <br>
jump into or pull myself in with the steering
wheel and 30 bushels of <br>
rye in the bed causes it to squat, with twice
as much tire under it than <br>
the old ones had.. It doesn't ride all that
much better, just cooler <br>
when the A/C works. OK rant off.....<br>
<br>
Cecil<br>
<br>
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