Short answer: yes. Water transfer heat better than glycol. Longer answer: When I worked in aerospace about a century ago, one of my first assignments was process control for the heat treat area. We solution heat treated a bunch of aluminum. (Solution heat treat: <http://www.azom.com/Details.asp?ArticleID=2540 > This was done to soften the material for forming. To reduce residual stress, we used a quenchant of 20% polyalkalene glycol. This provided a slower quench than water. Quenching in water would have resulted in much more residual stress and distortion. Slower quench = slower heat transfer. Numbers here: http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html http://www.engineeringtoolbox.com/overall-heat-transfer-coefficients-d_284.html Water is about 14% more efficient at 220 deg F. Jim |
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