supply water temps

Keith M

The output of Slant/Fin Fine/Line 30 model 30-75 at 120 F and 1 GPM flow is 209 BTUH/HR/Foot. This is based on 65F entering air.

I don't know how someone gave you a 2.5 conversion factor.
If you have further questions, you should call John Schrank of Slant/Fin's technical services department. The phone is 800 873 4346.

For your info.

Keith Muhlmeister

Slant/Fin

schiller

supply water temps

has any one operated a boiler / baseboard system w/ water temps around 120 deg. I call slant fin to find out what type of btu out put we could expect. the published info only rates the radiant out down to 140 deg. The techanical customer service rep said to use a 2.5 conversion factor, uh? so he said multply the h2o temp by 2.5, well that sounded so simple i hung put befor testing the math, using that formula I got more btu's out of the radiant at 120 deg than the published numbers at 140 deg.
so, what type performance can we expect?
FYI this is for a Geothermal option, the orginal proposal was for the the wm ultra.

Constantin

I'd graph the published points...

... and extrapolate carefully from there (i.e. do not assume a straight line!).

IIRC, the output from any kind of baseboard drops rather precipitously as you approach 140°F. Presumably, this has to do with induced convective currents not being very strong when the ΔT between the room air and the radiator isn't high... which is why I bet few baseboard manufacturers publish that kind of low-end data, even if they had it.

I'd check out the library here for more info. It's probable that Dan has already posted lots of good performance data on radiators/baseboard/etc. there.

Brad White_9

Constantin is correct on why

convective elements do not function as linearly as radiant/exposed emitters.

It is the change of mode between conductive and convective, putting the "dynamic" in thermodynamic. Making that leap takes a little effort. Once the temperature rises to the next tier (especially where the fin-tube manufacturers begin to give documentation), it becomes more linear. Other variables of course, but in essence, Constantin nailed it.

Trying to coax cold air to rise without much enticement from a tepid element? Air sits low and says, "Oh yeah? Why should I?" and "Make me!".

Cold air = Joe Pesci

Xc8p2dC_2

Data, floggers

You guy's can talk, data, graphs, flows, terminology all you want, but sometimes it's someting simply put

"""Trying to coax cold air to rise without much enticement from a tepid element? Air sits low and says, "Oh yeah? Why should I?" and "Make me!"."""

That makes the most sense > LOL

Look for Brads, seminar on> THE LAYPERSONS GUIDE TO TERMINOLIGY>>>> Too funny,,, thanks Brad