designing a smart heating system for a hospice

24 Nov 2004
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United Kingdom
we have been looking at various commercial offerings (devolo, geniushub) that supposedly offer complete smart control. we are not completely happy with their algorithms.

the core of the system is a condensing boiler running on oil.

we have 12 radiators across the rooms and 4 wet underfloor circuits.

ideally, we want to be able to program full proportional control of the rad valves based on setpoints from the rooms. it is important to have complete access to proportional control so that we can regulate the flow through the rads as the room temp approaches setpoint.

this will then give us better control over the heat in the returning water to the condensing boiler, so that it will operate in most efficient mode.

we also want pretty well total independent control over the firing of the boiler, again so that we can switch the boiler off "before time", and use the remaining legs of hot water in the large circuits to best efficiency.

the current offerings do not seem to be this smart.... ie, they are like "we need heat - fire boiler"..... ok, finished heating, switch off boiler" which clearly leaves large dead legs in the plumbing.

any recomendations very welcome. we have some elementary knowledge of PLC programming, serial comms and not very much experience in modern (eg python) programming.....
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