2 pipe compared to Monoflo tee

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Old 11-14-08, 08:40 AM
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2 pipe compared to Monoflo tee

I am spliting up a one zone system in a very large house and am constantly coming up with interesting questions. All comments appreciated.

I am piping 3 cast iron radiators and have options for system type.

All things being equal, will a 1 inch monoflo tee piped system have the same temperature at the end of the return line as a 1 inch 2 pipe reverse return system?
 
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Old 11-14-08, 08:56 AM
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Originally Posted by zizanio View Post
All things being equal, will a 1 inch monoflo tee piped system have the same temperature at the end of the return line as a 1 inch 2 pipe reverse return system?
The monoflo will require a higher velocity for the flow, so the return temperature will be higher. The ΔT (temperature change) will be less, so if you are using a condensing boiler, I wouldn't put in a monoflo system. The best way, in my opinion is to home run it all back to supply and return manifolds.

What kind of boiler is this for? How is it piped now?
 
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Old 11-14-08, 10:39 AM
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I plan on installing 2 or 3 staged Burnham or Buderus boilers. More than likely non condensing.

I am in the middle of setting up a primary secondary system with over 8 zones. Right now there are over 30 radiators on one zone.
I recently added 2 sections to the house with radiant heat.
 
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Old 11-14-08, 11:39 AM
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How are those 30 rads piped?
 
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Old 11-14-08, 02:49 PM
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Originally Posted by Who View Post
How are those 30 rads piped?

The house is currently heated with 2 seperate boilers, one is a 300k btu 2 pipe hot water that heats 24 radiators and the other is a 150k btu steam that heats 6 radiators.

I want to do away with the steam boiler and connect those 6 radiators to a new p/s system I am considering that runs off 2 or maybe 3 smaller boilers adding up to about 300k btu.
 
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Old 11-15-08, 10:15 AM
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In that case, I'd do it with 2 pipe - ideally reverse return or you could even home run with much smaller piping. Monoflo is hard to calculate, and requires more pumping...
 
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