[AT] Airflow calculations of perforated metal for radiator screens

[magreer67]

Wouldn't that be 56% blockage and 44% open to flow through?Mark GreerSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Cecil Bearden <crbearden at copper.net> Date: 6/17/21  11:34 PM  (GMT-05:00) To: at at lists.antique-tractor.com Subject: Re: [AT] Airflow calculations of perforated metal for radiator screens 
    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...
      Cecil
    
    On 6/17/2021 7:48 PM, Brad Loomis
      wrote:
    
    
      
      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.
        Brad
      
      
      
        On Thu, Jun 17, 2021 at 5:23
          PM Cecil Bearden <crbearden at copper.net> wrote:
        
        I
          had to wash the A/C condensor and radiator out on my 2011
          Chevy truck 
          yesterday before I could make a trip to pick up some auction
          items.   I 
          put the gauges on my a/c system and it showed 35 low and 350
          high.  
          before I did anything I went to the water hose and got it down
          to 150 
          pretty quickly on the high side.  The amount of bugs was
          crazy.  I will 
          have to remove the radiator and condensor to get them clean as
          there is 
          no room to get anything in the front or behind the fan.   I
          have one of 
          those heavy cowcatcher style grill guards in the front.  This
          truck has 
          about 170K miles and has made 3 trips to Alaska, so it may
          have more 
          bugs than usual, but the bugs and thi8stle seeds are terrible
          here and 
          getting worse.  I want to put a piece of perforated metal
          behind the 
          grill guard to catch the bugs. If it cuts the air down, it can
          still 
          come in between the screening and the grill.  I don't think it
          will make 
          a lot of difference in the amount of air entering the
          radiator, but 
          maybe catch the bugs and fluffy crap in the air...     When we
          figure 
          airflow into a home, we cut the flow through a window in half
          when a 
          screen is used.    I am looking at a peforated metal with
          holes .188in 
          in diameter and offset centers so it gets the most holes per
          square 
          inch.   Does anyone have any experience with this type of
          screening or 
          have a formula to determine if it will cut the airflow too
          much. I think 
          the area behind the grill guard and the grill is wide enough
          to keep 
          from cutting down the air flow.  Traveling down the road at
          60mph it may 
          deflect some air around the grill instead of through..
          
          I just don't want to have to remove this radiator again.  I
          have to use 
          a stepladder to work on the d&%$^d thing it is so tall. 
          It is stock for 
          that year, but the manufacturers want to see how far the
          drivers can 
          jump to get into a pickup nowdays.  I remember a 63 and 66
          chevy 1/2 ton 
          pickup we worked out of on the farm every day.  Hauled 20 head
          of cows 
          in a bumper  trailer with no brakes into OKC Stockyards. 
          Loaded 60 
          bushels of wheat to haul to the elevator when the lines were
          long and 
          the grain truck had not returned.  Now, I have a 3/4 ton that
          I have to 
          jump into or pull myself in with the steering wheel and 30
          bushels of 
          rye in the bed causes it to squat, with twice as much tire
          under it than 
          the old ones had..   It doesn't ride all that much better, 
          just cooler 
          when the A/C works.   OK  rant off.....
          
          Cecil
          
          _______________________________________________
          AT mailing list
          AT at lists.antique-tractor.com
          http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com
        
      
      
      
      _______________________________________________
AT mailing list
AT at lists.antique-tractor.com
http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com

    
  

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.antique-tractor.com/pipermail/at-antique-tractor.com/attachments/20210618/c62cc08b/attachment.htm>