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 Topic: Electric fan heater dispute
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23/2/2006 at 12:13am
Location: Redditch
Outfit: SWIFT Challenger 570
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Joined: 18/2/2006 Silver Member 
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I'm now confused.
Having never been that good at physics and not paying too much attention to the three types of radiation "Alpha Beta & Gamma" whilst in class I am now confused as to weather or not the electric fan is:
A: a good thing or
B: a bad thing
please help as Im hopefully going away soon and I can't bear to have this hanging over my consience.
Kindest regards
Dave
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Dave & Chel
He who laughs last, didn't get the joke!
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23/2/2006 at 8:40am
Location: Zoetermeer Holland
Outfit: Chateau 430 Nice
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> whilst in class I am now confused as to weather or not the electric fan is:
A: a good thing or
B: a bad thing <
It's a good thing. It does not cause any condensation.
I will try to explain the full story.
Condensation occurs on surfaces with a large difference in temperature on its two sides, normally inside and outside, like on windows. The condensation sets on the warm side, hence inside the tent.
On that surface exactly on that point the air temperature lowers. Cold air can contain less water than warm air, hence when cooling down that bit of air looses its water which than attaches to the particular surface (water has the physical property to attach to other surfaces): window or flysheet of the tent.
Warming up the inside of a tent will allow the inside air to contain more water, so in general LESS condensation will show.
A fan will make the air pass along the colder areas, warming them up, and absorbing more water: taking away condenstation. Direct a fan heater to a window and you will see the condensation vanish, exactly like on the windscreen of your car. You clear it up by using blown air alongside the windscreen.
It's the same in a tent.
Why does one yest see more condensation in a tent? Simple. You breath and when exhaling you blow out water of your body. Plus everybody sweats, always, continuously, even if you don't really notice. It's a large amount of water, litres per day.
Using a burner inside, be it heater or a hob, also will create water a product of the burning (actually the same reason why your breath contains water, although in your body that is a very slow process, but it does create your body heat).
So when it's cold people stay inside during the cold evening, usually more people, adding to the amount of water to be contained by the air inside the tent by breathing and sweating. Using a gas heater will increase the amount of water insider the tent. On the flysheet this will condensate due to the difference in temperature. That's all. it's a natural process.
Again, warming up inside will diminish condensation due to the higher capacity of warm air to contain water and blown heat, especially of a fan heater will improve this. The blowing creates contact of new warm air with the condensated water and thus will absorb that to it's maximum capacity.
Plus again: a tent is made to endure it, so there is no problem for the tent. It is much more a matter of comfort the have dry air inside as that feel warmer. Dry air will transport lees heat from your body than cold air. The water in cold air makes it a better conductor of heat, away from you body so it will make you feel cold.
Hence all this thermo wear, the principle of which is that it conducts sweat/transpiration away from you body and creates a layer of dry air directly around your body, so you will cool down slower end thus feel much warmer.
Any ventilation will renew air, it will transport the inside air containing more water to the outside, and let in new colder air, still containing less water. This air will warm up and thus absorb more water inside, drying out the inside air. Ventilate and this process of drying will continue and compensate for the water of peoples breath and transpiration.
In general you can say that if a lot of condensation shows, more ventilation is necessary
So, a fan heater is a good thing, especially when combined with adequate ventilation.
Don't worry and just bring your fan heater, you will enjoy it.
Post last edited on 24/02/2006 08:58:50
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WL
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