If you want to know about the swamp cooler thing I'm afraid I'll have to talk about evaporative cooling. Sorry.
With the pump running, but no fan, the water was evaporating slowly. With the fan running the water was evaporating quickly. The more rapid the evaporation, the more cooling effect. (You also need to consider that more rapid evaporation from the tank resulted in more rapid replentishment of the the water with COLD TAP WATER. But my point is still valid. You really want a swamp cooler to work well? Spray the pads with a constant stream of cold water from a hose!)
The definition of "wind chill factor" refers to how cold the air FEELS, not how cold it actually is.
All other things being equal a car's engine will cool off more quickly on a windy night than on a still night. The warm engine heats the surrounding air, and that warm air itself is an insulating layer that slows further heat loss. If cold air is circulating and blowing the warm air away the engine will lose heat more rapidly. This is also the primary reason for the "wind chill" phenomenon since evaporation of moisture from your skin is only a small part of the equation, but by definition "wind chill factor" has to do with how a person FEELS. Cars can't "feel" anything. If the ambient air temperature is 20 degrees the engine will reach that temperature more quickly on a windy night, but it won't drop below the ambient temperautre whether the wind is blowing or not.
-mickey
p.s. I can't believe I just posted that. What a silly discussion!
p.p.s. And to answer the original question (again): If the ambient temperature is below the gel point of the fuel then the fuel will drop to the gel point on a windy night more quickly than on a still night. Call it "wind chill" if it makes you feel better but it has nothing to do with evaporation, or how the fuel "feels." It has to do with the layer of warmer air surround the tank, lines and engine being blown away by the wind and replaced with colder air, which absorbs heat more readily.
[This message has been edited by mickey (edited November 22, 2000).]