Initial setup for very slow system? (Underfloor heating in old brick building)

ScratMan / HASmartThermostat

Smart Thermostat with PID controller for HomeAssistant

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Initial setup for very slow system? (Underfloor heating in old brick building) #81

Closed freaked1234 closed 1 year ago

freaked1234 commented 2 years ago

Hey there!

I am living in a massive brick building with underfloor (water) heating that is very slow to react. Could you give me some guidance how to initially setup this thermostat and how to fine tune it over time?

Thank you very much!

ScratMan commented 2 years ago

Hello, if you already have temperature measurements on which you can see the oscillation due to regulation, you may compute the PID gains using the method described here : https://github.com/ScratMan/HASmartThermostat/discussions/21#discussioncomment-1709437

10bn commented 1 year ago

@freaked1234 Did figure this out for yourself and could you may share your settings?

freaked1234 commented 1 year ago

@freaked1234 Did figure this out for yourself and could you may share your settings?

Hey, since winter was pretty much over when I wrote this I don't know if my settings work. I'll play around a bit with it when it is getting colder and will let you know.

Maybe we could exchange contact details and work something out together. First we should compare our building specs to see how much difference there is. A throwaway mail of mine is aerielpally@gmail.com

Anyway I'll post my settings as soon as I know they work and I would appreciate if you could do the same!

T81 commented 1 year ago

Some useful info would be the temperature of inlet water (if known) and if it is easy to overshoot the setpoint temperature

T81 commented 1 year ago

@freaked1234 any updates?

HermesHonshappo commented 1 year ago

Here are the values I have for a room with underfloor heating, using water.

Kp: 40
Ki: 0.00075
Kd: 30000
Ke: 1.5

Room is insulated basically: sheetrock with 8cm insulation behind, and when the floor was poured, there is 8cm insulation below the floor with the water pipes. But the walls behind the insulation are basic brick, the windows are basic double glass windows (but the cheapest ones in the store), and the ceiling has no insulation yet

The water inlet is regulated to 35°C (I have a mechanical temp controlled mixer & pump purchased from Amazon)

I get regulation I'd say is acceptable:

EDIT: one thing I forgot to add: I have a temp sensor that is in the floor slab. And I'm regulating not by measuring temp in the room, but temp of the floor slab. I found that having the floor slab at 25°C during the day gives an acceptable room temp (between 18 and 19°C), and good comfort