[Equest-users] High boiler energy use compared to HW loop demand

[B. Fountain]

If you are manually setting the boiler capacities -- you may also wish to
set the heating loop sizing to primary from the default secondary where it
is sized based on the coils etc.

> I have had the same problem when I let EQUEST automatically size the
> boiler for me.  In my situation, EQUEST drastically oversized the boiler
> so it was running at 10% capacity 90% of the time.  You can check to see
> if you have the same problem by looking at report PS-C to see what part
> load range your boiler is operating at.  To fix the problem, first I
> manually set the capacity of the boiler, which helped a lot, but the
> program was still over estimating the energy consumption.  Then, I created
> a custom performance curve using actual data for my boiler.  That solved
> my problem.
>
> From: Josh Doherty [mailto:jdoherty at dcengineering.net]
> Sent: Tuesday, June 16, 2009 10:14 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] High boiler energy use compared to HW loop demand
>
> I have a situation where my boiler energy use (= 950 MBtu) is extremely
> high compared to the hot water loop demand = 550 MBtu.  The modeled
> efficiency of the boiler is 80%...which should result in an estimated 690
> MBtu of boiler energy use.  Any ideas what could be going on here?
> Thanks.
>
> Josh Doherty
>
>
>
>
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