Piping panel radiators

Wayco Wayne_2

The Homeowners are building their dream house and are insulating like crazy. R-38 for the Walls and R-78 for the ceiling. The radiant floor water temp is 90 degrees. I am re-sizing the 6 radiators for over 4000 btu's since I had not allowed for the btu's of the radiant floor in these spaces. 2 of the zones are 100 feet from the utilty room. The 3rd zone is 50 feet. That's .8 gpm per zone with 200 feet of leader tubing. I guess I could size the rads for 90 water but I can't imagine how big they would be. I could also put these zones on a different temperature of 130 degrees but I feel that would be hard to control since it's all one slab. I think I'll look up the Buderus panel rad sizing charts and see what they say. Thanks for the ideas. Let me know if anything else comes to mind. WW

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Wayco Wayne_2

I have a job

I am designing that is all radiant floors. 3 wings of the house have a lot of glass and need suplemental heat. I was going to use panel rads but am nervous about how to pipe them because the lines are so far away from the utility room. I have to run pex through the slab so I have one chance to get it right. I was thinking of running from a manifold and running a loop to each of 3 zones. Each wing is 100 feet away from the untility room. I need 6 radiators at about 8000 btu's each. Help me think this through. WW

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Adam_12

6 rads at 8000btu each

Is that 3 wings with 2 rads in each ?.Could you run a 3/4 hepex supply and return to each zone ?.Aim at getting it the middle of the two rads[so your 1/2 runouts are as short as possible].You can then use a sprinkler valve box that you will use in the concrete to conceal the manifold but permit access for balancing and maintenance.The valve box can be concealed with a removable cover that the owner can have finished to there liking.Just an idea .

[Deleted User]

I'd suggest

sizing the radiators for low temp operation, same temp as the floors, then run parallel ports of the same manifold serving the RFH to the Panel rads, install TRV at the panel, set slighty lower than the RFH stat, and viola, 2 stage heat, wirless and automatic.

ME

J.C.A._3

I'd size like ME said.

and provide a bypass at the panels. I believe Oventrop makes a unit that screws directly into Buderus panels, that will fit your need. Unfortunately the number escapes me right now. (looks like an "H" and gets piped like a regular panel setup with the feed on the left) Set the actuators to keep the room comfortable on higher than normal days of heat loss, and to kick in only when needed. Chris

Weezbo

WW..

go with a remote manifold station in a closet wall. have them make it 26" on center of 2X8"s ...then bring two one inch supply and return legs to that station in the framing space on oppisite sides of the 26" free space..now you have a supply on the left and a return on the right.

make it one large zone,injection loop, you could get high heat baseboard off to the left and right,multiple injection pumps + mechanical mixers with each thier own by pass zonevalve and pump.for mixed water temps of different set points,leading out to the rad panels ,and have room for a manifold for the radiant , make sure you drag an electrical circuit for the station,out of the way near by and tstat junction box up above the header...for the floors. that way you can zone all three floors off 3/4' supply and retuns to your header make a similar smaller header at that junction with the 1/2" rolling up out of the slab. that way you can basically pipe everything any way you want and keep it tidy. you can get a lot of mechanical in 2X8 oh,plan on keeping your acess panel Higher than the floor by 10 inches or so,that way you can run the electrical conduit bends out of the slab and it protects the pipes in lieu of a mis Zhap .have to say,there are some Large walls of Glass going in on some Tall buildings these days...it is like people have taken to building their own monuments to stupidity. with R values like theirs though ,you will be happy to have done the work. i wish i could post some pictures...another thing that you can do to supplement btus is make rad panels out of Beams, have them sister up or marry tji's to them get some aluminum plates run them out and back leave plenty of room at the ends to make a wide swoopy lolly pop Uie back into the metal plates and use silver shiney 90;s to roll back into the framing. Peace *~/:)

Wayco Wayne_2

I was thinking

of doing something like that. Place a manifold in the middle of the zones so the runs wouldnt be as long. Run 3/4 from the boiler room to the manifolds, and then run 1/2 in to the rads. I think I'll size the rads at 120 degrees so my condensing boiler can keep it's efficiency real high. I'm going to feel them out to see if they are interested in solar assisted rad floors. Only 90000 btu's for all the heating in this house. They seem to have some money. They have a runway planned up to the back of the house for their 1945 open cockpit plane and 4 ultra lights. I like my customers a little bit eccentric. WW

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