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Internal screens fitted all blinds and shutter closed, if like the euramobil start the front Truma heater in the morning to clear the screen off if not start engine and run dash aircon for 10 mins. No more condensation, that's the fix, but I'm afraid you will never stop it happening in the first instance in the cooler months, unless you sleep in the rear bedroom which helps to reduce it.
Dave
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I have a small 12v/240v peltier type de-humidifier which I use in my loft. I have not tried it in the motorhome although I would have thought that it would reduce the humidity, and therefore the condensation.
How can an electric heater reduce humidity?
It can heat up the screen so that it is above the dew point thus stopping condensation on the screen but all that will happen is the condensation will take place on some other cold surface often in a cupboard hidden from sight.
There are two major causes of condensation.
1. Too much moisture in the air - can only be reduced by more ventilation of proper air-con.
2. Surfaces too cold and below dew point. As stated above this can be reduced by raising the temperature of the surfaces.
There are at least two kinds of humidity measurement.
The first is absolute (or real) humidity and this is simply the measure of water vapour in the atmosphere. Raising or lowering the temperature cannot change this.
The second kind is relative humidity and this is the ratio of the amount of moisture in the air compared to the maximum amount of moisture the air can hold. Hotter air can hold more moisture than colder air so heating the air reduces the relative humidity.
The body responds to relative humidity. A low relative humidity means that the air can absorb a lot more moisture and so the body can sweat more easily as the exposed moisture on the skin will evaporate easily. When the relative humidity is 100% sweating will be almost impossible as the exposed moisture will not be able to evaporate.
So though heating a MH will make the atmosphere seem much drier it will still contain the same amount of moisture as before it was heated and this moisture will condense on any surface cold enough.
The dew point is the temperature the air has to be cooled to to make the relative humidity 100%.
Air con works on the principal that air is cooled to a temperature below that of the existing dew point.
Once the air has fallen to the dew point the relative humidity is 100%. Cooling the air further cannot increase the relative humidity above 100% so moisture is forced from the air leaving it at a "new" 100% humidity.
Confusing!
______________________________________________________________ Old but still game
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Hi I tried taylormade & silverscreen for external blinds for the new Hymer & was told they had no plans to produce any in the immediate future then tried Vancomfort very very helpful may be worth a call.
Alex.
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Wss in France a couple of weeks ago on an aire and the German Hymer A class next to me had an external screen around the windscreen and the drivers door/passenger window on the other side. I wondered how it was secured and discovered that there were 2 round devices on each side, similar to those self adhesive hooks that you can get, although obviously make for the purpose, and the bottom and top of the screen was secured to these points.
Nothing fixed at the top of the screen and the wind was so strong it was difficult to walk against it, screens didn't move all night. Hope this helps.
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Hi
I tried Taylor-made and Silver screens. Got the response that they did not make them but if I rang again in six months time they would see what they could do. This was for a Dethleff globebus I3. Then I tied Van Comfort. Welcomed with open arms, full of apologies that they had not got that model in stock and there would be a delay.. Two weeks later they arrived with fitting instructions etc. ( Can be viewed on their web site). Quality and fit is really good. Bit more expensive tan the ones I had on previous coachbuilt but thes fit much better. They are going to be at the National show, Staall 157 I think.
Don
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The fan idea did seem to work last night, although temperatures here weren't that low this morning so may be a false hope (and there is a noise factor to consider).
Following the suggestion by javea03730 it seems that investigating unorthodox means of securing an outer screen may be in order.
BTW: Anyone know where you can get some of the nylon material as used on those outer screens? We may have a go at knocking up a "special".
I lie a microfibre towel at the bottom of the windscreen (inside) and use a large window squegee to turn the moisture into running drops. Start at the top and wipe horizontally, soak up the water and move another towel length sideways. Takes about 3 minutes every morning and the screen is reasonably clear.
Using the screen demister takes at least 15 minutes and is anti-social and environmentally unfriendy. Driving with a wet screen would be dangerous!
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