The high thin overcast has started to dissipate with the approaching high pressure.
The clearer skies have allowed better radiant cooling and the temperature dropped to 42 F last night. I had a small amount of ice on one of the black PVC pieces but none with the fancy radiant cooler. The interior of the box was 28 degrees with the OAT of 42. Only a small amount of ice formed which would imply that the temperature did not drop quick enough to allow for better ice formation. I am using a glass bowl as a control and it was 40 degrees.
I need to figure out a method of improving the heat transfer to dissipate the heat of fusion to produce faster freezing. It is interesting that the simple black PVC surface seemed to be better that the fancy carbon coated radiant fins of the computer CPU cooler. This may be an artifact of the quantity of water involved.
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