[EnergyPlus_Support] Hybrid boiler system system

["JV Dirkes II" <jvd2pe@xxxxxxx>]

Dear E+ Forum,

I am modeling a "hybrid" boiler system, which uses a small high
efficiency condensing boiler as the first stage of heating, and a
larger, less efficient boiler as the second stage.

I've manually sized the boiler capacities and boiler water flows.  I
have also set the HEATING LOAD RANGE BASED OPERATION to define the
upper limit of the first stage as equal to the first boiler's capacity.

However, the first boiler never reaches full capacity before the
second boiler starts operating.

Have any of you modeled this system? Can you offer suggestions why the
first boiler is not loading fully?

Thanks!


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