More over/undershoot queries (HR92s and HomeAssistant)
Posted: Sun Jan 16, 2022 2:34 pm
EDIT: Not sure the images are working so I've attached a screenshot showing
WC: tiny room, maybe oversized radiator and affected by Utility temps
Main bedroom - furthest away and slow to reach temp
Hall - cycling?
E bedroom - OK?
Landing - OK and heated by Hall below
Spare room - heavily cycling
I've had Evohome installed for just over a year now and apart from needing an occasional HR92 reset it's been brilliant. Reading some of Richard Burrows (@RichMWPHS) tweets and blogs and with a growing interest in efficiency improvements, I started to tweak the system. I was looking for ways to better understand how it was performing, particularly as some rads were struggling to get evenly hot. I am keen to better balance the system, minimise flow temp at boiler and understand how rooms affect each other. I setup HomeAssistant which provides useful logging and graphs to visualise the system activity. In some cases, rooms behave well, such as the Dining Room:
But in other cases, I see over/undershoots. In the spare room, where we just keep ticking over at a low temp, we see this castellated effect in the graphs:
Could this be because it is a room over a cold garage? Or is it a side effect of trying to maintain a low temp in there? Or is the radiator oversized? Because it is a spare room, I don't have concerns about comfort levels for occupants but I am concerned this apparent cycling could be inefficient.
We've also started to see this in the hall. Is it a coincidence I'm seeing this after I reduced flow temp and adjusted some rads' fully-open lockshield valves to decrease flow in radiators close to the boiler, in an attempt to improve performance of those furthest away. Or is it due to the nature of the shape of hallways with open staircases?
Presumably, the gradient of "warm-up" should be fairly consistent and where there is a dramatic difference between rooms, with some struggling to get to target, that suggests some balancing is needed - is that right?
Finally, I've seen in other posts that people have been logging the valve status (System Summary percentages in the base display?) which I think could be really helpful. It would be great to know how that info is accessed. I saw that, with HR92s, ideally the system should be operating near to 100% with lower flow temps, so it would be great to be able to monitor that alongside other data, instead of having to use the base unit display for that.
Any advice very much appreciated.
WC: tiny room, maybe oversized radiator and affected by Utility temps
Main bedroom - furthest away and slow to reach temp
Hall - cycling?
E bedroom - OK?
Landing - OK and heated by Hall below
Spare room - heavily cycling
I've had Evohome installed for just over a year now and apart from needing an occasional HR92 reset it's been brilliant. Reading some of Richard Burrows (@RichMWPHS) tweets and blogs and with a growing interest in efficiency improvements, I started to tweak the system. I was looking for ways to better understand how it was performing, particularly as some rads were struggling to get evenly hot. I am keen to better balance the system, minimise flow temp at boiler and understand how rooms affect each other. I setup HomeAssistant which provides useful logging and graphs to visualise the system activity. In some cases, rooms behave well, such as the Dining Room:
But in other cases, I see over/undershoots. In the spare room, where we just keep ticking over at a low temp, we see this castellated effect in the graphs:
Could this be because it is a room over a cold garage? Or is it a side effect of trying to maintain a low temp in there? Or is the radiator oversized? Because it is a spare room, I don't have concerns about comfort levels for occupants but I am concerned this apparent cycling could be inefficient.
We've also started to see this in the hall. Is it a coincidence I'm seeing this after I reduced flow temp and adjusted some rads' fully-open lockshield valves to decrease flow in radiators close to the boiler, in an attempt to improve performance of those furthest away. Or is it due to the nature of the shape of hallways with open staircases?
Presumably, the gradient of "warm-up" should be fairly consistent and where there is a dramatic difference between rooms, with some struggling to get to target, that suggests some balancing is needed - is that right?
Finally, I've seen in other posts that people have been logging the valve status (System Summary percentages in the base display?) which I think could be really helpful. It would be great to know how that info is accessed. I saw that, with HR92s, ideally the system should be operating near to 100% with lower flow temps, so it would be great to be able to monitor that alongside other data, instead of having to use the base unit display for that.
Any advice very much appreciated.
.