[EnergyPlus_Support] Re: Oversizing in a heating coil

["Elmer Morrissey" <elmofuddly@xxxxxxxxx>]

Hi all,

I'm sure it is something small, but I cannot spot it. I've uploaded 
the problem to the files section (in Problem submittals). It's 
called in 'AA2.idf'. If anyone has the time, I would appreciate the 
help.

Kind regards

-Elmer

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elmer Morrissey" 
<elmofuddly@...> wrote:
>
> 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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