On Thursday, 30 November 2017 12:47:33 UTC, T i m wrote:
On Thu, 30 Nov 2017 03:32:53 -0800 (PST), whisky-dave
wrote:

On Wednesday, 29 November 2017 17:06:57 UTC, T i m wrote:
On Wed, 29 Nov 2017 08:50:01 -0800 (PST), whisky-dave
wrote:

On Wednesday, 29 November 2017 16:32:58 UTC, T i m wrote:
On Wed, 29 Nov 2017 13:38:10 +0000, Andy Burns
wrote:

whisky-dave wrote:

What I don't understand is why a 1.3KW heater would be better than a
2KW at giving out heat.

It *might* be better, if. e.g. the 1.3kW can operate at 100% duty cycle,
but the 2kW keeps hitting its overtemp stat and operates on less than a
65% duty cycle.

The other thing that came to mind is that he would probably get more
heat out of the radS with them all on.

what if we ran it at 240V rather than 215V or 202V ?

What do you think?

I think it would make it a pooreer heater due to this cycling you refer to.

Agreed.

and part of the reason (or so I was told) that we had a new voltage conditioner transforms installed for the WHOLE enginneering building not just for our lab or our floor. This building incorperates at least 3 wind tunnels for the aerolab for testing, when they fire those up it sounds like a jet engine outside.
A mechanical enginnering lab with welders and the like, 100s of computers, offices a couple of 100 I'd guess and a number of labs both research and teaching on 4 floors.




If we ran it out a lower votage the duty cycle would increase to a higher percentage which you claim is bester.

Correct and I do.

So isn't it better to have 220V than 240 for this POV.


would it be better or worse at providing heat. ?

What do you think?

So what is the optimium volage for a 2KW heater ?

What do you think?

I would hope that it is the voltage it has been designed to work on and that is what they call the operational voltage but that of course depends on other factors.

Correct, 'designed voltage range' so as to either not damage the unit
or it not perform reasonably expected.

So conencting it to yuor home ~240V would in theory be overrating the heater as it was design for running at 230V NOT 240V


(and potentially maintaining)
the 1300W element than with them all trying to run both (at ~2kW
total) because of the voltage drop from the crap power supply.

So run it at 110V then it is highly unlikely it'll NEVER cut out.

What do you think?

I doubt it would ever reach the point where the overheat protection is applied.

Agreed.

So does this make it a more efficient heater ?
Strange that they say 230V then isn't it.



But if it does..
back to the 9V battery so it definanlty won't ever overheat.

What do you think?

it's would depend on the battery whether it could, but I don't believe the heater would ever go into it's 'cycle' as you call it.

Agreed.

So does this make it a more efficient heater ?



I also think that runnin git at about 240V of possible would make it less efficiant than running it at 202V

It wouldn't affect the 'efficiency' (as it will always be ~100%
efficient) but that might indirectly affect it's ability to heat the
room (as) effectively.

Why would that be the case if the 'efficiency' was the same ?

remmeber the transformer installed lowers the voltage to increase 'efficiency'.


And with that supply he'll probably be getting as much heat out of the
ring main as he will the heaters themselves. ;-)

didn;t seem to be the case afer a couple of hours.

Like you, it was a joke mate. ;-)

and thr biggest joke is someone claiming that 240V is the correct voltage to apply to a heater that says it's operational voltage is 230V.

Who said that then?

you're the one claiming that 240V is the 'standard' not me.


I took the tester home last night and I too got a reading of 238-239V
went down to 237-8 when boiling my kettle.

So not 202V then?

No that is our lab when we overrate the MCBs designed current carrying capacity by 8 amps.


Even the 51Hz went down to 50Hz

Not because of what you did alone it didn't.

At first glance I had no way of knowing that, soemtimes I;m just too observant I guess.



but then again I don't think such small changes mean much as the unit samples at about twice per second.

And that.

Yep and with switch on/off spikes and the like.


So, have you tried running one of the 2kW heaters on just the II
setting yet, just to see what happens?

Yes it runs at 1055W or there abouts depending on the input voltage remmeber that small point ?

Today it's running at 1003W at 208V in my office ambient temp 21C,





Cheers, T i m