[EnergyPlus_Support] Oversizing in a heating coil

["Elmer Morrissey" <elmofuddly@xxxxxxxxx>]

Hello all,

I have a problem with a system. I have three zones which are supplied
with fresh air (heated to 20C) and three electric heaters. The
electric heaters take priority and as a result, the heated air fresh
air picks up any additional heat. The problem is with an autosized
system which manages the temperatures in the zones fine, the problem
is in the plant loop.

The AHU consists of full FA setup with a supply fan and a heating
coil. The heating coil is connected to a constant volume system (with
bypass pipes) and a boiler. When I autosize the system, it is set to
an overly large level. The heating coil never requires these flowrates
so the vast majority of hot water flows through the bypass pipes (less
than 1% flows through the heating coil). This means that the pump adds
all the heat and the boiler is never required.

Can any point out why the flowrate through the heating coil would be
so hugely oversized leading to zero input from a boiler. 

My sizing parameters are 1,4;

Kind regards

-Elmer






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