Mark E

Billy_3

Date: February 17, 2004 10:47 PM
Author: Mark Eatherton (athotmaildotcom)
Subject: What...



is the configuration of the series string. How many feet of BBR, where. I.E. Boiler, 10 feet 1/2" PEX, 7 feet BBR with 300 BTUH load, 10 feet PEX, 15 feet BBR, 7500 BTUH load and so on and so forth. I can use Siggys Wonderful Software to tell you what will happen, but need a lot of data on your part, including room loads in BTUH.

ME







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Date: February 18, 2004 08:02 AM
Author: Frank (Frank)



from the boiler there would be about 30 feet of pex. Then 13 feet of slant fin 30 7,107 btu. Then about 8 feet 1/2" pex feeding 15' of slant fin 30 8800 BTU. Then 8 feet 1/2" pex feeding 11 ' slant fin 80 7600 BTU. Then 20' of 1/2" pex feeding 4' slant fin 80 2500 btu. 8' 1/2" pex feeding 5' slant fin 30 and then 30'1/2" pex back to boiler.

Mark Eatherton

Frank.

The 1/2 inch PEX will work. However, your baseboard lengths in the order you gave them to me are 15 ft, 20 ft, 16 ft and 6 feet. I assumed neglible pressure drop through the boiler, and a Grundfos 1542 on speed 2 is just about perfect.

You are on the jagged edge of velocity at 4.1 feet per second.

It should work just fine.

ME

Billy_3

thank you

Thank you very much I really appreciate the help

Mark Eatherton1

You're welcome...

the increase in baseboard lengths is due to the decreasing fluid temperature as it flows through the series circuit.

As a possible alternative, you could consider using a four port manifold, and then all 4 BBR's would see the same entering water temperature, and the amount of board could be lowered. PEX is cheap.

ME