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Old 11-15-2014, 02:46 AM   #31
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Seems to me that when travelling in winter, you would have heat on overnight in the trailer which keep would keep the lines and taps unthawed. The few hours towing between stops and heat I would think would not suffice to freeze the plumbing? The black and grey tanks would have to be emptied but again while using the trailer much liquid going into those tanks is warm. So why would I be overly concerned as long as the trailer doesn't sit protracted periods in sub zero ( or less than 32) temps? Has anyone experienced plumbing failures due to freezing?
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Old 11-15-2014, 08:00 AM   #32
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Quote:
Originally Posted by bolerfan View Post
Seems to me that when travelling in winter, you would have heat on overnight in the trailer which keep would keep the lines and taps unthawed. The few hours towing between stops and heat I would think would not suffice to freeze the plumbing? The black and grey tanks would have to be emptied but again while using the trailer much liquid going into those tanks is warm. So why would I be overly concerned as long as the trailer doesn't sit protracted periods in sub zero ( or less than 32) temps? Has anyone experienced plumbing failures due to freezing?
Windchill !!
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Old 11-15-2014, 08:20 AM   #33
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Windchill has no effect on inanimate objects.
Objects and Air Temperature
The National Weather Service Forecast Office explains that objects, such as metal, cannot be cooled beyond the temperature of the air, regardless of wind chill. For example, an inanimate object that is exposed to cold air and low temperatures may become cold rapidly, but unlike people or animals, it is not possible for the inanimate object to be stripped of internal heat. However, some exceptions do apply.



Read more : Does Wind Chill Affect Objects Like Metal? | eHow
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Old 11-15-2014, 08:21 AM   #34
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In addition the sloshing of the contents while traveling will also prevent freezing, moving water takes more cold than still water to freeze.
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Old 11-15-2014, 09:42 AM   #35
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Is there any problem driving with the furnace on?

I suppose people with heat pads could drive with them on, using 12V (if not driving for an extended time and depleting batteries)?
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Old 11-15-2014, 09:54 AM   #36
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In addition the sloshing of the contents while traveling will also prevent freezing, moving water takes more cold than still water to freeze.
Actually, the opposite is true. Sloshing about will allow the water to contact the sides of the container, which are usually colder than the water itself, drawing heat energy out of the water via conduction.

Running water, as in a hose, continues to draw heat from the new water feeding through the hose. Streams that seem to take longer to freeze, are actually drawing heat from the other pockets of water, or even the ground underneath to keep it a bit warmer.

I know we discussed cooling before, but it is not the addition of cold that makes things cooler, it is the removal of heat. Again, the wise words of my thermodynamics instructor, which easily explains the way to look at this. "There is no such thing as cold, just an absence of heat"
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Old 11-15-2014, 08:03 PM   #37
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Quote:
Originally Posted by cpaharley2008 View Post
Windchill has no effect on inanimate objects.
...
Read more : Does Wind Chill Affect Objects Like Metal? | eHow[/I]
Thanks, but the article is of very poor quality. The author apparently doesn't even know the difference between heat and temperature - that's okay for the average person, but not for someone claiming to communicate expertise in thermodynamics.

It doesn't matter to heat transfer whether an object is living (animate) or inanimate. The auther did pick up the concept of having an internal heat source, then came to some strange conclusions that don't make sense.

Moving the heat transfer medium (air in the case of the outside of our tanks) causes heat to transfer faster: the tanks eventual temperature isn't any lower, but they get there faster.

Winchill is a formula intended to suggest how quickly exposed skin cools. Despite the babble in the article, wind over a person is not able to chill them (or a waste tank, or anything else) below the ambient temperature. Saying the windcill is -30 degrees when the temperature is -20 degrees but it's windy doesn't mean exposed skin will ever get to -30 degrees... only that the skin will loose heat about as fast as with an ambient temperature of -30 degrees and still air.

So yes, the rush of air under a moving trailer will chill the warm tanks toward the cold ambient temperature faster than sitting still.
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Old 11-15-2014, 08:32 PM   #38
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Brian, what is the story on driving with the furnace operating? A-ok?
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Old 11-15-2014, 08:42 PM   #39
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We have driven with the furnace on before (by accident). On the other hand it is sure nice to arrive somewhere and the trailer is nice and warm...

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Old 11-17-2014, 01:10 PM   #40
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Thanks for the advice! We made it home safe and sound. Had a great time traveling along the Oregon and California coast. Pictures to follow soon!
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