On 2007-11-22 19:42:51 +0000, Lobster said:

wrote:

I do wonder how much "carbon" could be saved by an advertising
campaign to tell people how to use TRVs properly.

Damned right.

How many people (like SWMBO, to name but one) come into a cold house,
switch the heating on and crank up all the TRVs to max, rather than
leaving them set at 2-3 where they were previously set for a
comfortable operating temperature, because that way "they'll warm up
quicker".

And then later - "bloody hell it's hot in here, I'll open the windows"

Bless her.

David

It's called an outer control loop - human hysteresis.

As soon as you have this control term in your system, forget about PWM
control of the boiler, anticycling and fine grained control.