[OpenTRV-interest] Question from Steve R

Mark Wigmore mawigmore at gmail.com
Sun Nov 22 11:27:35 GMT 2015

I have a Worcester-Bosch that has an outside weather sensor and moderates
the circulating temperature accordingly. It would be better with a variable
flow rate as well, but a lot of the time it performs well.


On 22 November 2015 at 10:55, Simon Hobson <simon at thehobsons.co.uk> wrote:

> Mark Wigmore <mawigmore at gmail.com> wrote:
> > If you've got the cash to splash then Evohome works well, but for a
> fraction of the cost you can get a similar effect using programmable
> motorised TRVs.
> Yes, similar if you're happy going to each rad to change it's program any
> time you want to change it, and not be able to see what any room is set to
> without visiting it's TRV. And that's assuming the TRV is actually
> accessible !
> My goal would be (eventually) to have feedback from each TRV as to it's
> valve position, and regulate the flow temp accordingly. That way, under
> light heating load, the flow can stay up a bit but at low temperature -
> avoiding the "rad cold but for a small (very) hot spot at one end" effect.
> Or depending on the setup, avoiding the noisy system pumping water round
> through the bypass because the stupid boiler design* can't cope with normal
> heating loads.
> Next stage is to feed that back to a motorised TMV to control the flow
> temperature, and to an intelligent stat that will only maintain the lower
> section of the thermal store to a little above that.
> A thermal store, modulating pump, and all TRVs makes for a wonderfully
> quiet system :-) An "intelligent" TMV on the flow and "intelligent" store
> thermostat would make it even nicer.
> * Which is universally the case unless someone can tell me otherwise. I've
> never found a boiler designed for other than a  flow rate that gives around
> 20˚C delta-T.
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