Radiator mean temperature

[Johnytuono]

Hopefully someone can explain this.
Boiler flow is 60c, have balanced the rads to about 12c with a differential thermometer.
For some reason the flow pipes show 51c and the return 39c yet the rad. mean temperature is around 50/52c, why is this if the flow pipe is less than the mean temp.?
I have 10mm Microbore tails, the boiler does show water heated to 60c and the return is about 10c(ish less) but obviously this rises as the boiler modulates.
Anyone?

 

[Wayners]

Outer pipe temp is lower than core temperature I guess

 

[Johntheo5]

Hopefully someone can explain this.
Boiler flow is 60c, have balanced the rads to about 12c with a differential thermometer.
For some reason the flow pipes show 51c and the return 39c yet the rad. mean temperature is around 50/52c, why is this if the flow pipe is less than the mean temp.?
I have 10mm Microbore tails, the boiler does show water heated to 60c and the return is about 10c(ish less) but obviously this rises as the boiler modulates.
Anyone?

all (if) system boilers have a internal bypass, the displayed and actual boiler temperature will always be higher than the measured return temperature, I have seen numbers on here of the boiler return being up to 7C higher than the measured return due to the internal recirc. The boiler flow temperature and your measured temperature though should be quite close.

 

[ericmark]

You have done well, I tried and failed, by time I had done the last one of eight radiators, returning to first, it was no where near what I had set.

But does it really matter? I reverted to using the TRV report, if the current exceeds the target, then lock shield needs closing a tad. So with electronic TRV heads, may as well use the reported temperature to set lock shield valve.

 

[Johnytuono]

all (if) system boilers have a internal bypass, the displayed and actual boiler temperature will always be higher than the measured return temperature, I have seen numbers on here of the boiler return being up to 7C higher than the measured return due to the internal recirc. The boiler flow temperature and your measured temperature though should be quite close.

This is at the rad I'm measuring John
Boiler flow is set at 60c but the radiator flow pipe (even on the very first rad) is around 51c, surely it should be about 60c, otherwise, if my rads were specced at Delta 50c (75/65c) the boiler flow temp would have to be ridiculous at about 85c in order for the temps and delta at the rad.
I can't understand how my rad mean temp can be higher than the actual flow temp at the rad unless the Microbore pipe is somehow affecting it. I'm running pump speed 3 btw.

 

[Johnytuono]

You have done well, I tried and failed, by time I had done the last one of eight radiators, returning to first, it was no where near what I had set.

But does it really matter? I reverted to using the TRV report, if the current exceeds the target, then lock shield needs closing a tad. So with electronic TRV heads, may as well use the reported temperature to set lock shield valve.

yep, I'm wondering wether I might be best just making sure all rads (apart from one undersized one) have the same mean temperature of 52c (boiler flow 60c).
I've even tried all l/s fully open and control the heating just by the TRV's.
Balancing doesn't seem to give me any real savings, does my head in