Hybrid Car – More Fun with Less Gas

electric heater efficiency - Page 11

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Posted by Josepi on November 28, 2010, 2:56 am
 
Air moving over objects does **NOT** cool them unless they are warmer than
the air passing over them and surroundings.

Air passing over a moist item, like a human will tend to cool them, though.


Well, actually it does.  There is some heating of the motor
and the moving air will eventually turn to heat from friction.
But, air moving over objects and persons will have a cooling
effect as well.  In any case, the standard method of measuring
efficency does not take the movement of air into account.



Posted by Josepi on November 29, 2010, 2:57 am
 
Not just twice...sometimes three and four times! Geeeshhh!

Apparently my NNTP provider had some problems and were not sending out a
confirmation code to my reader/poster. The usenet browser tries to post the
same one again and again until it gets a confirmation. This used to happen
frequently in Usenet groups years ago.

My apologies for this. Irritating as hell for me too.



Is there a reason all your posts show up twice?





Josepi wrote:




Posted by Josepi on November 28, 2010, 2:56 am
 Air moving over objects does **NOT** cool them unless they are warmer than
the air passing over them and surroundings.

Air passing over a moist item, like a human will tend to cool them, though.


Well, actually it does.  There is some heating of the motor
and the moving air will eventually turn to heat from friction.
But, air moving over objects and persons will have a cooling
effect as well.  In any case, the standard method of measuring
efficency does not take the movement of air into account.



Posted by Josepi on November 28, 2010, 2:56 am
 Air moving over objects does **NOT** cool them unless they are warmer than
the air passing over them and surroundings.

Air passing over a moist item, like a human will tend to cool them, though.


Well, actually it does.  There is some heating of the motor
and the moving air will eventually turn to heat from friction.
But, air moving over objects and persons will have a cooling
effect as well.  In any case, the standard method of measuring
efficency does not take the movement of air into account.



Posted by Ralph Mowery on November 28, 2010, 3:38 am
 

The moving air will evaporate water and make the object cooler.  However
that heat goes into the room so the net effect is no heat is gained or lost
from this process.  The fan motor will heat up the room somewhat and the
friction of moving air will add some heat.
Total results is that the ammount of electricity used is still converted to
100 % heat.  This is not counting the loss of the wiring in the walls.



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