let me ask a radiant ?

Weezbo

if you inherited a slab with 14000' of he pex what do you think would be the way to get heat into the 28 500'X 1/2" loops. on a-35 below zero F day :) got you wondering? is there a computer programme that says How to? I would like to learn something and hey maybe share a few ideas....

Radiant Wizard

I would

walk away. Tubing is too small and loops are too long to start with. I thinking this is some type of commercial bldg I would like to know how may rooms this bldg is broken into. What's it's heat loss? There are numerous questions.

heatboy

GPM?

How much water do you need to get down each loop? I'm figuring this is a commercial slab, so a 30° Delta T would be an option. Know that, A couple (few?) of 26-99s may work adequately. I'v done 400' 1/2 loops with a 15-58 and a 20° drop. It was a residential application, but you get the idea. Your situation is far from terminal.

hb

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Floyd_5

HDS!!!!!!

the Hydronic Design Studio by Siggy!!!!!

Says that if you run 4 loops with a 0013 Taco you will get 1.42 GPM and 38481 BTU per circuit on a 4" slab @ 18" C

Check it out @ Hydronicpros.com

This is a MUST HAVE program!!!!!

Whoops... that was @ 180*.......

@ 130* it's

1.35GPM and 20736 BTU per circuit...

580,608 BTU for 28 loops.....

if you want to run 7 pumps....

See how easy that was....


Floyd

hr

What's the load?

need this info first off. Tube spacing? Building use? Shop, storage, etc? Lots of doors, glass, etc. This may be quite "fixable"

It's not a snowmelt, is it

Get yourself a HDS software from Siggy and you can model all sorts of "what if's"

hot rod

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Ted_9

Its www.hydronicpros.com

Weezbo

this is an air craft maint hanger.

the ceilings are like twenty foot high and there is a wall of doors...It is great that all of you recommend a computer program engineer ,however ,what happens when you dont have that as an option ?you guys arent quitters youd say well hmmm...what are the dimensions ,what is the use of the area ,what in my experience is similar to this,how tight is the overall construction,how long are we going to have these doors open and at what time of the year,how am i going to get enough heat in the building to heat the thermal mass to apoint where 50 50 propyline glycol will flow through Any loop,how high in the slab is the tubing,how thick is the slab,how were the loops laid out,is there anyone living here what is the temperature that the slab and room have on a designe day of 76 below zero how much insulation is under the slab.... and Why did God find My phone # to hand this guy:) ...time to break out the pencil and paper when i get home to try to figure all these variables:)right now the guys looking at me and i ve got to lash up some heat just to work in the place... I know you guys have had similar experiences and the whole point of the question was" in action We,d Think first get as much accurate info ,if we dont know at That momment, we know where to find the information to do, no one who answered said "I.d run the other way"...I think this comes from a sence of confidence in our "miricale working abilities " when everyone else has gone " Oops I gotta an apointment ...and uh...you gotta find somebody else."...thanks for your answers thoughts. Weezbo.