[OpenTRV-interest] First impressions and questions

[Marko Cosic]

On 27 Jan 2017 8:03 p.m., "Chris Skerry" <angela.skerry at gmail.com> wrote:

Marko,

Sorry but you are wrong.


Bold. ;-)

My company bought an 8 zone Evohome kit to evaluate when it launched. This
was our direct experience and we mucked about wirh it a lot.


I believe it is the air movement (cold breeze) that sets the TRV
temperature to 5 degrees for 30 minutes.  Note that the TRV display says
‘Window 5 deg’.


It's a rapid temperature drop that does it.

If the TRVs are mounted in the correct location for chirping room
temperature (the top of the rad not at floor level) then a eat of air at
17C is sufficient to trip the window open sense in the 21C room.

Hiding the TRV at floor level near the edge of the room lessens the
likelihood of it happening. Keeping it further from the door also lessens
the likelihood of it happening. The former is not a great idea for precise
room temp control. The latter is unavoidable in many rooms.


Well Damon should install Evohome and Danfoss LivingEco to assist in
competitive analysis.


I'd save the cash and supply some people who have this installed some
monitoring kit to see how it actually performs. ;-)


My £10 says he will find Evohome better!


IMO the Danfoss product is the better one of the two.

You'd expect this given their history of knowing a lot more about radiator
control than Honeywell, who were always more about click-click room
thermostats than self acting mechanical valves on radiators.

Tado will be one to watch. They aren't fools and is the newest and priciest
of them all.


-- 
M



Regards,……………Chris

On 27 Jan 2017, at 19:52, Marko Cosic <marko at coheat.co.uk> wrote:


On 27 January 2017 at 19:23, Chris Skerry <angela.skerry at gmail.com> wrote:
>
> I notice it kicking in winter time when the front door is opened for a
> period of time to load stuff from the car boot into the house.  Another
> occasion is in the bathroom when I open the window to get rid of the fug
> that is clouding the mirror.  the cold air causes it to display ‘window’
> and set to 5 degrees, for 30 minutes.
>

IME if you start doing any 'zoning' with the EvoHome system, driving
temperature differences of say 21C in a room and 17C in the hall next to
it, then this feature will also kill the heat every time you open the door
to that room.

Fine if all the rooms are set to all the same temperature but this rather
defeats the purpose of the exercise!

The self learning features also get as royally confused by door open/door
close, weather comped flow temperatures, and incidental gains as you'd
expect.


I recommend you buy an Evohome system and install it in your house.  You
> will then understand what you are up against.
>

I'd use the Danfoss LivingEco stuff as 'the benchmark' myself but yes!


Also these where mounted at high level:

http://www.ebay.co.uk/itm/152362511225

http://www.ebay.co.uk/itm/013G3001-Ventilunterteil-Danfoss-
RA-UN-10-3-8-Eck-Ventil-/231595409377

(there'll be a set going into my place and getting instrumented in due
course)
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