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Boiling Point

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goff

Joined: 18 Jan 2007
Posts: 71

Posted: Fri May 29, 2009 10:35 pm Post subject: Boiling Point

Does anyone know the centigrade boiling point of 50/50 glycol/water coolant in a 912ULS with a 1.2 bar pressure cap ?



We can exceed the 120C maximum on long taxis on hot days but do not seem to lose any coolant. So at what temperature does it actually boil?



Goff Moore

G-CHOX

Visit -  www.EuropaOwners.org

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rob(at)hyperion-ef.com
Guest

Posted: Sat May 30, 2009 8:06 am Post subject: Boiling Point

At http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html the boiling

point of a 50% mixture of pure ethylene glycol and pure water is given as

107.2 deg C but this is at  atmospheric pressure at sea level.  Antifreeze

also contains other stuff (such as corrosion inhibitors) that will further

increase the boiling point, and at higher pressure the boiling point is

elevated further. I haven't got the required reference materials at hand,

nor do I recall the long ago learned equations used to make the adjustment

for pressure, so let's just say that 120 deg C looks close to the boiling

point.  A detailed discussion of antifreeze at elevated temperatures can be

found at http://www.newton.dep.anl.gov/askasci/chem03/chem03987.htm



Also, how accurately is the temperature and pressure known?  While the

temperature probably correct to within a few tenths of a degree I suspect

that the pressure is likely to be less accurately known.

Best regards,



Rob Housman

Irvine, CA 

Europa XS Tri-Gear

A070

Airframe complete



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mooredca(at)tiscali.co.uk
Guest

Posted: Sat May 30, 2009 8:58 am Post subject: Boiling Point

Goff,

  

 I've looked up your question on the boiling point  of 50:50 glycol:water at about 1 barG.

  

 See:

  

 http://auto.howstuffworks.com/cooling-system7.htm

  

 Looks like the 50:50 glycol:water boiling point at  atmospheric pressure is 106 deg C

  

 At 1-1.2 BarG, the boiling  point increases by about 25 deg C, i.e. its boiling point will be about 130  deg C.

  

 (Usual caveats about getting data from the  internet, apply..!)

  

 Regards,

  

 Dave Moore

  

 Aberdeen, UK

  

  

   [quote][b]

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frans(at)paardnatuurlijk.
Guest

Posted: Sat May 30, 2009 9:06 am Post subject: Boiling Point

Goff wrote:

 	  Quote: 	
		   

 

 Does anyone know the centigrade boiling point of 50/50 glycol/water coolant in a 912ULS with a 1.2 bar pressure cap ?


	


In my setup, with 1.2 bar pressure cap and a 50/50 mixture, and two

independant gauges (CHT & coolant), I can reach 130 degrees without

spoiling coolant. At these temperatures however, I can hear after

shutdown some "boiling noises", so the coolant reaches at some locations

the boiling point (as can be expected), but doesn't spill yet.



-

Frans Veldman

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