[OpenTRV-dev] Radiator controls

[Bo Herrmannsen]

i might be wrong.... but it could be coded so that it can take a pwm input and regulate the heat from that....

damon is the expert on this one as its his "secret" side project

what it does is that it skips mains cycles so in fact it limits the watt's.... he have used it do drive his electrical kettle when making coffee.... 


for that he matched the current used to what his solar cells produced.... it took him longer to boil the water but he got there



it just made me think it could be used for an electrical heater too.... and maybe even get better resolution settings the heat level compared to the old dial...


and then my thoughts led to it could be coupled with the opentrv...


it was just late night thughts.... so it might not be clear thoughts


Den 27/12/2013 kl. 17.26 skrev Bruno Girin:

> What does DD1 have in terms of controls?
> 
> 
> On 26 December 2013 18:04, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:
> oh....hmm... thinking 
> 
> what i think is maybe a combo of DD1 to make them variable... and then OpenTVR ?
> 
> makes any sense?
> 
> 
> Den 26/12/2013 kl. 18.17 skrev Bruno Girin:
> 
>> Bo,
>> 
>> Yes, they are electrical as I say in my post, which is exactly why I posted them: because of that, they can all be controlled individually which is what we want to do with OpenTRV. So I thought that getting inspiration from electrical radiators in terms of control could be a good way to make our own controls intuitive.
>> 
>> Bruno
>> 
>> 
>> 
>> On 25 December 2013 13:35, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:
>> hmm
>> 
>> are these rads not electrical? just looked like so as they did not seem to have any pipes going to them?
>> 
>> 
>> Den 25/12/2013 kl. 12.18 skrev Bruno Girin:
>> 
>> > Hi all,
>> >
>> > Following a discussion that Damon and I were having on Sunday while installing a boiler control at my place and quaffing fizz, I've taken pictures of the radiator controls at my mum's (see attached): she has electric radiators each with individual controls so in practice it provides soft zoning as we want to do. The controls are slightly different depending on the radiator but they are all roughly the same:
>> >
>> > - A slider / wheel with 4 settings:
>> > 1. Auto / prog: controlled by external programmer,
>> > 2. Comfort: warm setting for rooms that need a higher temperature,
>> > 3. Eco: slightly cooler,
>> > 4. Anti-freeze: keep the room at ~5°C to prevent freezing;
>> >
>> > - A numbered wheel a bit like mechanical TRVs that allow fine adjustment of the temperature.
>> >
>> >
>> > So for OpenTRV, we could have something like this:
>> > - A base temperature set by programming (with a sensible default),
>> > - 4 modes:
>> > 1. Anti-freeze: fixed temp ~5°C
>> > 2. Eco: target temp = base temp
>> > 3. Comfort: target temp = base temp + 3/4°C
>> > 4. Boost: eco/comfort temp + 3/4°C for a limited amount of time
>> >
>> > Then changing settings could be done 2 ways:
>> > Option 1: like today the 1/2/3 flash with a single Mode button,
>> > Option 2: a slider switch for Eco/Comfort + "heat on/off" button: when on "heat off" use setting 1, when on "heat on" use the Eco or Comfort mode depending on the other switch.
>> >
>> > The idea of option 2 is that you can set the eco/comfort switch room by room and leave it there; then you just have to set heat on or off.
>> >
>> > Finally have a the "learn" button that learns when you set heat on or off by updating an internal "program"; and the "boost" button that sets mode 4 for a limited amount of time.
>> >
>> > In terms of placement, you could have the eco/comfort switch slightly out of the way because you'd hardly ever use it and then the 3 other buttons on the front plate with 2 small buttons for "heat on/off" and "learn" and a Big Red Button for "boost".
>> >
>> > Of course, this would be a future release :-)
>> >
>> > If we ever add an optional base station, you could have each TRV store its own program, the central station store a copy of all programs and the two sync whenever any program is changed either at the base station or at the TRV through "heat on/off" and "learn". That way, each TRV can still operate on its own but also be programmed centrally.
>> >
>> > Thoughts?
>> >
>> > Bruno
>> >
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