Norm & Deb wrote:
One night outside temps were around 20 and the my remote sensor in the water bay was reading just above freezing. All was good. Up at sunrise and then I hit the Interstate. The wind from moving drove the temps in the bay down and the lines froze up in about a half hour.
The fix was to just stop, and wait until the ambient temps went above freezing. The pipes unfroze and we were on our way.
The "highway" wind drove the temps down. And I should have known that.
This is not quite correct, I suspect that the movement caused more cold air infiltration into the storage bays, but wind chill only occurs when water evaporates of a surface.
a metal surface will read the same temp when in motion or standing still. the air only "feels" colder to you because it is moving across your skin and water is evaporating from it
"Wind chill (popularly wind chill factor) is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of cold air.
Wind chill temperatures are always lower than the air temperature for values where the formula is valid. When the apparent temperature is higher than the air temperature, the heat index is used instead."
