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SCR dimmer control for portable electric heater??

M

mike

there is no thermal mass in this heater.....it is
mica-thermic

You probably shoulda been more accurate with your initial
"radiator" description.
Garbage in >>> garbage out...
 
G

GregS

SCR dimmers use PWM.

I rather like the idea of wiring two heaters in series. This will reduce the
total output to half of what it was, but it will be better spread around the
room, which might be a net improvement.

It will reduce the current to (approximately) half, which will reduce
the heat output (power) to one-quarter that of a single unit. Power is
I^2*R.
[/QUOTE]

You forgot to multiply twice the resistance. It will be 1/2 the watts total.
Each unit will be 1/4.


greg
 
J

Jeffrey D Angus

Is this called a "Variac"?

Not really, a variac is just a variable auto-transformer. giving
you a 0-100% range of output vs input voltage, and has a defined
curent limit based on physical size.

The variable inductor, is more of a magnetic amplifier type of
device and relies on the core of the inductor saturating to vary
the series imedpance with the load.

Jeff
 
P

Phil Allison

"Robert Macy"

well said, now include the thermal coefficient for the filament...


** It a HEATER - you fucking IMBECILE.



.... Phil
 
J

Jeffrey D Angus

Phil said:
** It a HEATER - you fucking IMBECILE.

Do you eat with that same mouth?

Admittedly, if the heating element is Nichrome, it
doesn't have much of a temperature coefficient.

Jeff
 
P

Phil Allison

"Jeffrey D Angus"
Phil Allison wrote:

Do you eat with that same mouth?


**Do you always REMOVE the context entirely when posting

great lumps of BULLSHIT like this ??

Admittedly, if the heating element is Nichrome, it
doesn't have much of a temperature coefficient.


** No fooling ??????????????

Now tell that BULLSHITTING TROLL Macy too.

An leave the FUCKING CONTEXT visible.

Idiot.



.... Phil
 
J

Jeffrey D Angus

Phil said:
"Jeffrey D Angus"


**Do you always REMOVE the context entirely when posting

great lumps of BULLSHIT like this ??




** No fooling ??????????????

Now tell that BULLSHITTING TROLL Macy too.

An leave the FUCKING CONTEXT visible.

Idiot.



... Phil


Ok, Do you eat with that same mouth Phil?

Jeff
 
P

petrus bitbyter

"Robert Macy" <[email protected]> schreef in bericht
I have one of those 1500 watt radiator style portable
electric heaters. Love it

However, rather than the built in thermostat turning
the unit OFF?ON every 15 min's or so, I was thinking
it would be more efficient to use an SCR dimmer control
to vary the amt or power it gets?

Does anyone know of an SCR control hefty enough to
handle this kind of resistive heating load??

|2nd attempt to post this reply!
|
|use a saturable core reactor, which is a variable inductor controlled
|by a DC current through a secondary winding. Used to be made by
|Northlake near Chicago.
|
|The inductor, with 0 DC current has maximum inductance and 'starves'
|the resistive load down to 5 to 10%, then at maximum DC current the
|inductor is saturated and almost all the power makes it to the load.
|The transfer/control is monotonic, but very weird. L vs Idc
|
|The DC control winding is wound in a 'fgirue eight' pattern so that
|one adds, one subtracts with no net to the other winding, but due to
|the high number of turns, saturates the core locally. Saturating
|locally interrupts the magnetic field lines and is like opening up a
|large air gap in the core, thus the inductance drops to nil.
|
|I prefer radiant heaters, too. You can point them at yourself and sit
|very comfortably like in front of a fireplace. Used to have hot air
|blast heating but that made the room's air excessively hot in order to
|be comfortable when sitting. Then when you get up and move around you
|swelter. Whereas with radiant heat, the air can stay cool so when you
|move around, you're still comfortable. But those contact closures!!!
|very irritating if you went to sleep, they get very loud.
|
|The variable inductor is great for controlling resistive loads
|especially in the 1kW to 10kW ranges. ...you can actually make your
|own if you want.
|
|

Interesting solution though to me it looks like an overkill in space, weight
and cost. Modern electronics might not be that interesting but are very
effective.

petrus bitbyter
 
W

William Sommerwerck

Wheee! This "Phil Allison" ride is a great thrill, eh?
I see they finally fixed it so that it works reliably now.
Any response gets a torrent of abuse ...

No, any response he doesn't agree with. He can be quite courteous, if you
don't say something he finds insufferably stupid.
 
D

David Nebenzahl

** Go get totally fucked

- you pathetic pedant & self appointed net cop TWAT.

Wheee! This "Phil Allison" ride is a great thrill, eh? I see they
finally fixed it so that it works reliably now. Any response gets a
torrent of abuse ...
 
P

Phil Allison

"Robert Macy"

Not a troll, and there is value to what I say.


** ROTFL !!!

Satan is telling us how fine the weather is in hades.....




...... Phil
 
M

mm

You probably shoulda been more accurate with your initial
"radiator" description.
Garbage in >>> garbage out...

And in the very first post too.

"I have one of those 1500 watt radiator style portable
electric heaters. Love it"

I know what a radiator style portable electric heater is, but now I
have no idea what kind of heater he has.

Still, I wouldnt' worry about contact points wearing out or burning
out.
 
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