Re: [EnergyPlus_Support] Sizing plant

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Note that you have complete control over dry-bulb temperature and humidity in 
the DesignDay object through the "Relative Humidity Day Schedule" and "Dry-Bulb 
Temperature Range Modifier Schedule" fields.  For the solar, the only control 
you have is "Sky Clearness".

Here is a suggested approach:

1.  Run a PURCHASED AIR simulation with your design weather days (use Compact 
HVAC objects to set this up quickly).  Use the peak heating and cooling loads, 
design supply air temperatures, and zone setpoint temperatures to calculate the 
required heating and cooling supply air volume flow rates for each zone.

2.  Set up DesignDays that track the desired dry bulb and humidity conditions.

3.  In your original simulation which the autosized full system, in the ZONE 
SIZING objects, specify "flow/zone" as the "cooling design air flow method" 
(and heating" and then use the values calculated in step 1 to force the zone 
air flow rates.  The rest of the systems will autosize off of these flow rates 
and use the temperature and humidity conditions from the design day objects.  
At this point, solar values do not matter for the sizing calculations.

Mike


On 21 Feb 2006 at 11:12, fred buhl wrote:

> No; you have to use a design day.
> 
> Fred Buhl
> 
> tonybaxterhevacomp wrote:
> 
> >Hello anyone,
> >
> >I am trying to size plant.  I use weather data from file, rather than 
> >using a Design Day object, because we need to specify solar and 
> >temperature data explicitly.
> >
> >I tried setting up a 2 day weather file (winter day + summer day), with 
> >2 run periods, then tried plant sizing.
> >
> >I get the error ** Severe  ** Plant Sizing calculations need Design Day 
> >input.
> >
> >Is there any way that I can use weather file days for plant sizing?
> >
> >Thanks
> >
> >Tony Baxter
> >
> >
> >
> >
> >
> >The primary EnergyPlus web site is found at:
> >http://www.energyplus.gov
> >
> >The group web site is:
> >http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> >Attachments are not allowed -- please post any files to the appropriate
> folder in the Files area of the Support Web Site.
> >
> >EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
> > 
> >Yahoo! Groups Links
> >
> >
> >
> > 
> >
> >
> >  
> >
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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