[BLDG-SIM] determining summer vs. winter loads

[Aulbach, John]

If you have a 70C thermostat setpoint, your house must be close to the
Martian lander site (158F). I assume you mean 70F.

You need a load simulation program to simulate the house, or use a Bin
temperature setup to establish heating and cooling loads. Since your house
is running 24/7, the Bin Method is very appropriate, and the 8,760 loading
will break down into all heating or all cooling loads. Assuming 70F is both
the heating and the cooling setpoint, you can determine total hours cooling
and total hours heating LOAD.

Then subtract off the hours your cooling and heating system ran. You will
then have the load hours happening when the HVAC is not running.

There are Bin Method experts out there who can explain it much better. But I
believe this is your gist.

-----Original Message-----
From: Ian Doebber [mailto:idoebber at vt.edu]
Sent: Friday, January 30, 2004 11:26 AM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] determining summer vs winter loads


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 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 for breaking up the cooling and heating loads.

Thanks
Ian Doebber


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