[EnergyPlus_Support] Re: Hybrid boiler system system

["mingming_zuo" <mingming_zuo@xxxxxxxxx>]

It seems like two boilers located in series, if the heating load does 
not exceed the upper limit for the first stage boiler, the second 
stage boiler will not be used. So the second boiler does not start 
may indicate that the first boiler is enough to meet heating load.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" 
<jvd2pe@...> wrote:
>
> 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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