hot water chart

Rudy

we all know that 180 degree water will give lo output baseboard 580 degrees per foot.Is their a chart for lower water temps to corispond to baseboard degree per foot.EXAMPLE- Ihave installed a viessman vitola with max temp of 167degrees. what would this temp put my baseboard a foot at??. A chart would be very helpfull thank you.

bigugh_4

Factors in heating

1st. the room temp
2nd. the water temp
3rd. the gph
4th. the length of BB.

Useing what we know I'd almost bet the BTU output is linear . I doubt it would be on a curve, if all the factors were held at the same except for the water temp.
I throw this out. to see how far I am off! but if you plotted it linear I bet you'd be close!

bigugh_4

and that is not much!

167/180 is .927 & .927 X 580 is 537.66 BTU's

Rudy

Thanks bigugh!!

bigugh_4

Thatr musta made sense i hope it is correct!

> Thanks bigugh!!

bigugh_4

Thatr musta made sense i hope it is correct!

rb_8

Performance

With constant temp, variable flow the performance curve on air/water heat exchangers is on an inverted logarithmic curve but goes linear with larger delta t’s. This is why control valves come in quick opening, linear and logrithmic configurations…the target is to match the heat exchanger performance based on delta t and design temperature with the inverse characteristic of the control valve so the output is linear regardless of flow...now if we could only get the world of hydronics to understand a 'zone valve'(opens in seconds) is not a 'control valve'(engineered seat and plug profile and opens in minutes) we'd be eliminating over 80% of all the temperature instabilities created by matching up the wrong valve with heat terminal units....another topic - another day.

jeff_51

B&G puts out a heat curve chart for that as I'm sure others do