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Beginner problem

Discussion in 'General Electronics Discussion' started by Martine, Jul 18, 2011.

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  1. Martine

    Martine

    2
    0
    Jul 18, 2011
    Hi!
    I have a small query..In portable fan heaters, when the temperature of the heater is reduced, is it the fan speed that is reduced or the current to the heating element?

    Thanks in Advance!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Think about it.

    What would happen to the temperature of the element (and therefore the temperature of the exhaust air) if it was dissipating the same power, but less air was flowing past it?
     
  3. Martine

    Martine

    2
    0
    Jul 18, 2011
    Right..Thanks!
    Henceforth, little thought before anything.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Always better to come up with your own answer and know why :)
     
  5. daddles

    daddles

    443
    3
    Jun 10, 2011
    For the past century or more, the simplest and cheapest device to control with respect to temperature is the principle of the bimetallic strip, causing electrical contacts to open or close. Simple, rugged, and very reliable. The heater is either fully on or fully off; consequently, the heater element is being heated at one current level and the fan is fully on (some heaters have adjustable current levels for the heater current).
     
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