UFH Upstairs temperature help

[John Carroll]

41 minutes ago, richo106 said:

Yes I can understand the low dT, I checked the temps again this morning and loops ranged between 1-1.8 deg loss, but IR camera was bouncing around a little so hard to be super accurate 

 

I will turn off the GF manifold again so the the pump just feeds the FF to see what flow rates I can achieve per loop.

 

currently the ASHP feeds a buffer tank and then pumped from there to both manifolds using a single pump.

 

one thing that I want to try is not shutting my heating off during 4-7 during the expensive period to see if this makes any difference at all. I’ll just run my heating 24/7 on weather comp with thermostats set at 23.5 to stop overheating. 
do you think this will make much difference cost wise? It takes a large amount of energy to reheat the floors and buffer tank when it heats back up at 7 so hopefully it won’t be too much difference

 

any thoughts on this would be helpful  

 

@marshian probably answered your query re continuous heating.

 

You might check the Stuart Turner circ pump mode&setting, it has three constant curve settings and three proportional pressure settings, ensure its on constant curve setting 3, if not sure of the modes, tahe a photo of the pump switch or LEDs while running.

 

[richo106]

26 minutes ago, John Carroll said:

 

@marshian probably answered your query re continuous heating.

 

You might check the Stuart Turner circ pump mode&setting, it has three constant curve settings and three proportional pressure settings, ensure its on constant curve setting 3, if not sure of the modes, tahe a photo of the pump switch or LEDs while running.

 

Yes I will certainly try 24/7 running, will set this up tonight to see how I go on for the next few days. Will try and monitor temp and energy consumption best I can but not too cold at the minute 

 

If this doesn’t make anything difference I’ll defo look at increasing the flow rate, somehow splitting the circuits and installing an additional pump 

[marshian]

31 minutes ago, John Carroll said:

 

@marshian probably answered your query re continuous heating.

 

 

Every house I appreciate is different and responds accordingly but I was running 2 deg setback in most of the rooms for 4 hours at night and 5 hours in the day and in a week of relatively stable OAT's I used more energy on the setback days than I did on the 24/7 (if anything the setback days were slightly warmer although I was only looking at the average temp between coldest and warmest temp across 24 hrs (it could have been colder for longer on the warmer days)

 

It's one of those experiments that you do for fun

[richo106]

[marshian]

1 minute ago, richo106 said:

Yes I will certainly try 24/7 running, will set this up tonight to see how I go on for the next few days. Will try and monitor temp and energy consumption best I can but not too cold at the minute 

 

If this doesn’t make anything difference I’ll defo look at increasing the flow rate, somehow splitting the circuits and installing an additional pump 

 

You might not need to split the circuits - Heat Geek did a video on pump distortion not that long ago

 

 

[richo106]

I just turned my GF manifold off and checked the flow rates of the FF one

 

Basically when the downstairs is on its looking approx 24/25 

When the downstairs is off its about 35

 

Is that what people would expect?

 

I will look into the pump settings shorty

[richo106]

[richo106]

Right after looking on the internet

My pump was on proportional power - medium (flashing green)

I have now changed this to constant power - highest power (constant orange)

 

 

[marshian]

1 minute ago, richo106 said:

Right after looking on the internet

My pump was on proportional power - medium (flashing green)

I have now changed this to constant power - highest power (constant orange)

 

Modern pumps are a real head fug - they are a bit to damn clever sometimes

 

My limited understanding is the faster the pump speed the smaller the delta between flow and return so you give the emitter more time to get rid of the heat (That's the impact in my house) but in your case where you are trying to get the emitter to give off more heat it may well prove effective - guess testing and monitoring are required

 

Having said that constant curve is what I settled on (mainly because the flow on proportional settings changed from when I first set the pump up to maybe a week or so later - some learning logic I think)

[marshian]

19 minutes ago, richo106 said:

I just turned my GF manifold off and checked the flow rates of the FF one

 

Basically when the downstairs is on its looking approx 24/25 

When the downstairs is off its about 35

 

Is that what people would expect?

 

I will look into the pump settings shorty

 

Blimey 34.5 litres a min is 2070 litres per hour.... that feels like a heck of a lot of flow.

[John Carroll]

Changing the pump mode should result in  increased flow, interesting to see if it actually does.