Re: [EnergyPlus_Support] Summer/Winter Design Days for system autosize

Edwin,

I read the I/O reference concerning RunPeriod:Design

I tried to work with it; I created 2 objects (one for the Summer Cooling Period and another for the Winter Heating Period)

There is no option within the Zone/Sytem Sizing to add those design periods (just I have to select either Design Day or Flow Zone/System)

Could you please advice how I can specify those periods to be used instead of Design Days?

Kind regards,

Sherif

----- Original Message ----
From: Edwin Lee <leeed2001@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, July 30, 2008 4:06:02 PM
Subject: Re: [EnergyPlus_Support] Summer/Winter Design Days for system autosize

Sherif:

If you are looking to create DesignDay objects for your input file directly from the weather file, V2.2 has a new feature. The RunPeriod:Design object allows you to run any number of days from your weather file as 'design days'. Thus you could run a full week of summer weather as the design days to size equipment. This means you don't have to generate the ddy objects directly. More information can be found in the InputOutputReferenc e document, at about pdf page 76.

If you are wanting further analysis of the weather and design day data, then this probably won't help much!

Edwin

On Wed, Jul 30, 2008 at 9:41 AM, Linda Lawrie <linda@lawrie. com> wrote:

Look at the .stat data from when you generated the weather file (Meteonorm 6 can generate EPW directly). Or run the WeatherConverter program on your EPW file now.

There is a section that should say:
- Using Design Conditions calculated from this weather file.

- The following design temperature statistics are calculated based on THIS weather file ONLY
- and may not be representative of a long-term period of record normally used for
- design temperatures. Also, note that dew point temperatures are listed where
- wet-bulb temperatures are normally presented.

        Design Stat     Coldest Month   HDB 99.6%       HDB 99%
            Units            {}             {C}            {C}
          Heating       1        4.9     5.9

        Design Stat     Hottest Month   CDB .4% CDB 1%  CDB 2%  CDP .4% CDP 1%  CDP 2%
            Units            {}            {C}    {C}     {C}     {C}    {C}     {C}
          Cooling       8       49.1    48.1    47.1    29.8    27.4    26.5

        Design Stat     Jan      Feb      Mar      Apr      May      Jun      Jul      Aug      Sep      Oct      Nov      Dec
            Units        {m/s}    {m/s}    {m/s}   {m/s}    {m/s}    {m/s}   {m/s}    {m/s}    {m/s}   {m/s}    {m/s}   {m/s}
        Max WS   13.0    13.0    15.0    12.0    12.0    12.0    13.0    12.0    11.0    12.0    13.0    11.0

Alternatively, if Meteonorm did not know the WMO for your station and there is one, there might be a ASHRAE design condition. You can put the WMO in the proper place and then use the WeatherConverter again to slurp up the design day information in IDF form. (Using the above from your file, you will have to define your own design days).

Linda

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