Panel Rad piping strategy

Wayco Wayne_2 · January 2005

in a job that is a barn being switched to living quarters. The main barn is 48 x 34. They are interested in panels rads now that I gave them a price on radiant floors and they couldn't find the money in the budget to do it. I showed them a brochure of Buderus rads, but I've never done a job so stretched out horizontally. In the multi story houses in DC it is more vertical and I usually just run pex individually to each rad from a manifold. What type of piping would you use. The are 3 zones; the main barn, the upstairs, and a new addition/sun room in front. All zones are 20,000 btuhs to 25000 btuh each. Thanks for your input.

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Wayco Wayne_2 · January 2005

Just bumping up

I'm thinking monoflo tees, but I know Buderus has some kind of diverter that does the same thing. Maybe 2 pipe reverse return. I will be using the thermostatic radiator valve. Going to my meeting with the customer soon. WW

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kevin coppinger_4 · January 2005

Wayne....

yeah they have those diverter valves and many guys do the mono-low thing.....If I were you id stick with the manifold method...maybe 1 or two more centrally located stations. I did that for my house side to side. 1" off the boiler then slit 3/4' to each side of the house. Maybe a modification for you, 1 per floor....best of luck! kpc

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Uni R · January 2005

Panel piping

Reverse return for sure... and TRVs on nearly every panel and a differential bypass or maybe one of those Wilo circs will be ready?

Weezbo · January 2005

easy Just say \"Taco''

a pump block,three zone valves,trv on each rad pannel...is sorta too easy an answer...like you say its on the run and on the flat....no class on linear circuit analysis , well at least Look into it ....

hr · January 2005

Why not your tried and true

homerun system? Seems like it still fits this application nicely. Here are some other options.

http://www.pmmag.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2379,23759,00.html

hot rod

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Wayco Wayne_2 · January 2005

Home run

would use a lot of pipe in a building 48 feet long. I'm thinking 2 pipe reverse return, since the homeowner wants to use some old Cast Iron Rads he has in the other barn and mix in some panel rads and a Buderus Bench Shaped heat emitter. That would get the same temp to each rad and then each rad could have a TRV to control things. Thanks for all of the input. WW

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S Ebels · January 2005

WW

We have used a series/homerun/reverse return (I don't know if that's a hydronically correct term) on several occasions. All of which are operating just dandy.

In situations where the building layout or construction don't lend themselves to a single manifold, we'll use two or three. The supply is just a basic series type circuit with multiple manifolds at different locations and a single loop feeding each emitter. On the return side we simply reverse return the "series manifolds". A DPBV is installed in the near boiler piping. Size the circ for total system flow and the head in the longest loop. It has worked every time for us.

We have this setup running where the manifolds are in excess of 60' apart horizontally and up to 15' vertically. It's a little more piping on the main loop but it usually saves more than enough on the rad piping to compensate for labor and material any other way that I've fiddled with.

hr · January 2005

run some numbers

500 feet of 1/2" PAP should be under 200 bucks, even with 2 rolls (1000')seems like the parts and labor of PAP home run, against a larger copper loop??

hot rod

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Wayco Wayne_2 · January 2005

Why not

run the reverse return in PEX or PAP.tubing?? The largest zone is 25000 btu's that could be handles by 5/8 pex at a 20 delta tee. By the way what's the advantage of a larger delta T for rads. I read something about using 30 or even 40 degree delta on panel rads. Another subject I know, but maybe I should start another thread about it. WW

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Weezbo · January 2005

the pump block allows alot more delta t than 35 degreesF

did you read The article hot rod pointed out? i learned something from it.find the info on the pump block and trv's ...then think about the Delta "T" it allows,in addition to the individual panel rads trv's and consider...ooops right now i feel like the guy who tells you the good parts of the movie...solly.

Wayco Wayne_2 · January 2005

Weez.

What do you mean by Pump Block. I just re-read the article and saw nothing refering to it.

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Weezbo · January 2005

other than the pump block was not really on the market...

at the date of the columnist's editorial?

Panel Rad piping strategy

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