Re: [EnergyPlus_Support] Design Days

Homero.

On Tue, Mar 27, 2012 at 1:26 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

Read the design conditions section of the ASHRAE HOF (Handbook of Fundamentals).

The design days that are included with the EPW files (extension .ddy) are direct derivatives of those yearly conditions.
Sizing only uses the peak of any heating/cooling.
You could actually have a cooling peak on a winterdesign day but that wouldn't be common.

the next release after this will include monthly design conditions as shown in the HOF as well. Again, some peaks may happen at lower sun angles than the hottest months.

At 12:23 PM 3/27/2012, hnoboam wrote:

Dear List.

In many many example idfs I have seen only two design days used, one for summer, one for winter. However, in the weather file package for any site, for example for Beijing, the ddy file contains many design day definitions.
My questions are:
1. All the choices of design days are for me to choose one that I like?
2. What happens if I include more than one winter design day and/or more than one summer design day? I just did this and E+ ran, not sure what it did with the different autosized values.

Thanks

Homero

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Homero Noboa, Ph. D.