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 Topic: electric hook ups and heaters
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14/3/2009 at 12:13am
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Hi all
Heat is heat and power is power. Electrical power is in watts. It is determined totally by the voltage and the current passing through the resistive elements. Watts = Voltage X Current. When a heater is rated at 1500 watts, for example, it means the resistive heating elements will produce 1500 watts of heat. The method of getting the heat out from the heating elements into the air is the other factor. A fan, for example, will push the air out more quickly, perhaps, and spread it round more evenly into the room, but the amount of heat is still 1500 watts and the fan will not increase the amount into the room; it will only distribute the heat more efficiently, perhaps. Convection merely means the heat will travel due to the heat rises concept and will heat the spot near the heater quickly and the room less quickly, but in the long run it will still be the exact same amount of heat.
Halogen heaters are just another way of heating the air, the amount of heat is still the same, the heating element may be a different material and it may have different radiating qualities, but the amount of heat for a 1500 watt device will still be 1500 watts. Actually, the wire-wound heating elements that glow when turned on, whether there is a fan or not, are the most durable and will outlast all the other types. The oil-filled radiator types are heated with a resistive wire and have long life, they distribute the heat with rising air circulating around the radiator, but as the others, in the long run, it is still a 1500 watt heater. Whatever the heater wattage rating is, that is how much electric power they consume - period. Note, Lots of market hype in this area wanting you to believe that certain materials or configurations will magically produce more heat or thermal energy for a given input, but they can't and don't.
Electric heaters, many of them are designed to run the current right up to the max level the breakers are set to trip out. If the fan type heater uses more electricity it is probably because the element is staying on longer due to the fan blowing out the heat more quickly and distributing the heat away from the heater unit and keeping the thermostat just a little cooler on average - but the room may be just a little warmer due to the heater staying on a little longer than when compared with the non-fan style heater...... There are many variables.
Regards
Rex.
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"Be the person your dog thinks you are" (BM)
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14/3/2009 at 1:00pm
Location: Shropshire North Wales borders
Outfit: Adria Win
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Quote: Originally posted by nelmo on 13/3/2009
I was looking at the website for a campsite and they specifically banned halogen heaters - not sure why?
I suspect that this is because many caravanners took to running one in the awning, where they are highly visible, and the site didn't like them using so much electric. Possibly if they had the heating on in the van as well they were tripping the site electrics.
I have been on a few sites where they have notices saying that use of electric heaters per se is not allowed, probably for the same reason.
Although the site may have 10 amp EHUs, it's very likely that the installation can't cope if every unit tries to use the full 10 amps at the same time.
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Caz
If you can't see the light at the end of the tunnel, just keep going till you go round the bend.
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