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fluid in solar collector

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Posted by binzer on November 1, 2007, 1:58 am
Has anyone tried canola oil as the heat transfer fluid in a solar collector?
Is there any reason why you couldn't use it? The reason I ask is freezing
temps in western Canada wouldn't be a issue and it is bio-degradable.

Posted by Mike Scaife on November 1, 2007, 7:42 pm

Considerably higher viscosity than water or glycol mixture, so I would guess
for standard hot water panels the pump will have to be of higher power to
circulate enough volume. Perhaps one would use an oil with focused
arrangements where the temperatures are hundreds of degrees.

Mike (NZ)

Posted by Jeff on November 2, 2007, 5:23 am
 Mike Scaife wrote:

   Also note that canola oil has less than half the specific heat of
water, so you would need twice as much...


Posted by KDV on November 3, 2007, 9:41 am
Have you ever calculated the specific heat from a mixture of water and
glycol? Whit a mixture of -20C the specific heat is near 0.6 a 0.7  from
water! I think it is an advantage that the mixture has a low specific heat
and that in areas with mutch of cloudy weather. The water warmed up faster
in de collectors and it's cooled also faster in the solarboiler. So when the
sun is shining a little bit you can already transport heat to your
solarboiler. If your temperature controller is set at delta T of 3 C, you
will reach faster that delta T then with 100% water.

Kris De Voecht
Homepage: www.devoecht.com

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