Posted by Indiana Ken on January 24, 2013 at 17:50:03 from (66.249.232.131):
In Reply to: Wind-chill question posted by Brad Buchanan on January 24, 2013 at 10:31:12:
Quoting Removed, click Modern View to see
Okay I'll bite, to your question: You stated both tractors have been idle for a month however you did not state the temperature has been 0 degrees for a month:
Case 1, In the event the weather has been exactly 0 degrees for one month both tractors will be cold soaked to 0 degrees and there should be no difference in how they start.
Case 2, In the event your question assumes normal winter weather patterns where it warms up during the day and dips down at night the tractor exposed to the wind is more likely to be cold soaked to 0 degrees. The tractor in the barn is not exposed to the wind is more likely to be warmer. In this case the tractor in the barn is more likely to start or start more easily.
Why - the average temperature in winter over a 24 hour period will typically be much warmer than the 0 degrees which is likely a night time low. In other words there is more time at temperatures above 0 degrees than the time at or near 0 degrees. The tractor sitting outside in the 40 MPH wind will follow the temperature more closely due to the wind - this is called convective heat transfer. The tractor in the barn lacks the convective heat transfer and stabilizes at a more average temperature. As the temperature falls outside this tractor (metal temperature) will lag behind that of the outside air and the metal temperature of the outside tractor. (Sorry that got a little long)
Case 3, For Case 1) and Case 2) above I assumed the tractors were not "plugged in" since it was not stated. However, lets take the case where the tractors are both plugged in and the heaters are identical. In this case the tractor in the barn is more likely to start since there is no wind to carry away heat as the heater attempts to warm the engine block. Since the tractor is trying to keep warm similar to a human - the 40 MPH wind makes the tractor colder by reducing the effectiveness of the heater.
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