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Re: [EnergyPlus_Support] infiltration sensibly cools house in summer
No need to run EnergyPlus to calculate the monthly average outdoor temps...
All this information and much more is included in the STAT report for the weather
file. (Included on the EnergyPlus weather page:
US: http://www.eere.energy.gov/buildings/energyplus/cfm/weatherdata_us.cfm).
The STAT file is tab-delimited so it can easily be read in to Excel.
For Atlanta, the monthly average temps are:
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
4.7 6.6 11.6 16.1 21 24.1 25.2 24.5 22.6 16.5 10.5 6.6
----- Forwarded by Drury Crawley/EE/DOE on 02/02/2004 02:55 PM -----
<mjwitte@xxxxxxxx>
02/02/2004 02:47 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx@internet@HQMAIL
cc:
Subject: Re: [EnergyPlus_Support] infiltration sensibly cools house in summer
In your simulation, is the house conditioned 24hrs a day 365 days a year.; If
the house is always closed up, and the HVAC is always on, which is typical of a
simulation model, then it seems quite reasonable that the average outdoor air
temperature over the course of a summer is cooler than the indoor cooling
setpoint.; To answer this for yourself, have EnergyPlus report the average
outdoor tempature on a monthly basis.; If this is below your cooling setpoint,
then infiltration has a net cooling effect.; The published data may be based on
measurements or calculations in which the HVAC system is not on during mild
days when the house would likely be cooled by open windows.;
Mike
On 31 Jan 2004, at 19:54, Ian Doebber wrote:
> Analyzing my summer component loads for Atlanta GA, I discover that the net
> sensible effect of infiltration is negative.; In other words, infiltration
> sensibly overall cools my house during the summer.; The infiltration latent
> effect is as it should be, adding heat into the house.; When I view pre-existing
> data on summer infiltration effects on homes the reported effect is that it
> heats the house.; I am wondering if anyone else has had resultant data showing
> sensible cooling effect of infiltration during the summer and that the published
> summer effects of infiltration adds the latent and sensible infiltration effects
> together to get a rough estimate of the overall infiltration effect during the
> summer.;
>
> If the published data adds latent and sensible infiltration effects during the
> summer, then is this the same process used for winter infiltration effects or
> does only the sensible infiltration effect get reported since the latent load is
> insignificant during the winter.
>
> Thanks
> Ian
>
> [Non-text portions of this message have been removed]
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support;;;;;
EnergyPlus-Support@xxxxxxxx
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