2 pumps, different flow velocities?

[EricO]

Ok so if anyone could help me get a better idea on this, that would be awesome. I'm trying to figure out flow velocities and pipe sizes. Basically how can you have a 1-1/4 supply lines and 3/4" baseboard tubes? Flows don't seem to be compatible unless i'm missing something.

My system will be almost exactly like the diagram except that I wont have the solar, and the heating sources will be 3 zones of baseboards, all coming from a manifold.

THE PROBLEM: I want to use 1-1/4" thermopex from the wood boiler to the storage tank, and a pump that is pumping @ 11 gpm so my boiler can run full bore (BIOMASS 40 boiler) and warm the storage as well as heat the baseboards. But I was thinking of making the zone loops 5/8" pex, and the max flow is 3.3 gpm. Also thought of reducing to 1" right after the inlet to the storage tank.

Can there be 2 separate flow velocities in the system? Would the extra flow just go into the storage tank? Or what do I need to do?

HELP!
Eric

 

[jebatty]

Different flow rates in different parts of a system are common. Use balancing valves or circuit setter type valves to obtain the flow you want in each part of the system.