Re: [EnergyPlus_Support] breaking up heating vs cooling loads

["Joe Huang" <yjhuang@xxxxxxx>]

Ian,

This is a topic I've worked on for years (estimating component loads for the
building fabric and processes).   It's not an easy task if you're aiming for
an exact distribution that adds up to the building totals.  I've attempted
different methods, none of which worked completely for the reasons that you
mentioned - transient "pick-up" loads when the thermostat changes and loads
(or rather heat flows) when the building is floating. The best of the bunch
was to store the loads during the floating hours and then allocate them to
whichever mode appeared next, either heating or cooling, the logic being
that these cumulated loads appear as "pick-up" loads on either the heating
or cooling equipment when they have to turn on.

I used this approach to estimate component loads for commercial buildings.
For residential buildings, since run times were not a problem, I just did
sensitivity parametrics where I eliminated that component and looked at the
difference in loads.  That method, of course, also had its problems in
moderate climates, but was the simplest.

Joe
----- Original Message -----
From: "Ian Doebber" <idoebber@xxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Friday, January 30, 2004 11:29 AM
Subject: [EnergyPlus_Support] breaking up heating vs cooling loads


> From Energy Plus, I have a years worth of energy data for a house.  I am
wondering how to break it up into what contributes to the overall heating
load and what contributes to the overall cooling load.  So far, all the
energy data during hours the HVAC system is heating goes to the heating load
and likewise, all the energy data during hours the HVAC system is cooling
goes to the cooling load.  Pretty straight forward.  Yet I am wondering how
to break up those hours when the HVAC system is off.  Right now all I do is
put this remaining data into heating load if the hourly outside drybulb
temperature is less then my inside temperature set point (70 C) and the rest
of these hours into my cooling load.  This is just a rough estimate.  I am
wondering if there is a set benchmark or what most energy pluser's due for
breaking up the cooling and heating loads.
>
> Thanks
> Ian Doebber
>
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