[OpenTRV-interest] Programmable TRV performance

[Damon Hart-Davis]

Hi,

The split configuration does this already.

The all-in-one unit probably requires some TLC to help work round the issue that you observe: I’m still working on fixing the closest analogue that I have at the moment.

Rgds

Damon

> On 16 Feb 2015, at 16:12, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> 
> Is OpenTRV sufficiently advanced to do this yet?
> 
> Mark
> 
> On 16 February 2015 at 16:10, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> Hi,
> 
> Note of course that you may have temperature gradients across the room: in one of mine I observe ~2C for example.
> 
> So have the sensor near you if possible if this is an issue for you!
> 
> Rgds
> 
> Damon
> 
> 
> > On 16 Feb 2015, at 16:06, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> >
> > Thanks Damon, I was thinking it might be a combination of factors as you suggest.
> >
> > Looks like the best thing would be to have a TRV controlled by a wireless sensor in another part of the room.
> >
> > Cheers,
> >
> > Mark
> >
> > On 16 February 2015 at 15:49, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> > Hi,
> >
> > It may start closing well before the target temperature to try to minimise fluctuations; I start closing about 1C below the target I have in the OpenTRV control loop.
> >
> > Also it may see some direct radiative heating as I sometimes do on OpenTRV units, and be reacting to that.  It’s still something I’m working on handling fully elegantly.
> >
> > There may also be a calibration error of +/- 1C on the temeprature sensor (the one we use are closer than that).
> >
> > In other words, that place may be approaching 20C including direct radiative heat and air rising from the flow/return pipe when the valve closes thinking that it’s hit 21C.
> >
> > Rgds
> >
> > Damon
> >
> > > On 16 Feb 2015, at 14:52, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> > >
> > > Hi,
> > >
> > > Sorry if this is a bit OT, but I thought people in this forum might be the most likely to know the answer.
> > >
> > > I have a Honeywell HR25 programmable thermostat on my bedroom radiator. It is programmed for 21degC in the mornings, but I can hear the valve start closing from about 17.5deg as the room warms up and completely closed by 19deg room temperature. There's a good airgap all round the TRV; 500mm to the bed, 300mm gap under the bed, and 600mm at the end of the bed nearest the TRV. There is a window 240mm above the rad and the curtain stops 170 above.
> > >
> > > Any idea what's going on?
> > >
> > > Regards,
> > >
> > > Mark
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