Re: [EnergyPlus_Support] Transient simulation of building structure and indoor air

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

Zhuo:

The design day simulations are repeated for several days in order to 
reach a periodic steady state.  The "warmup" days end when the 
changes in temperatures and loads from one day to the next are within 
the tolerances specified in the BUILDING object.  The number of 
warmup days is reported in the eio output file and it is limited to 
25 days.  If the tolerances have not been met within 25 days, then a 
warning is issued (Loads Initialization did not Converge) and the 
simulation proceeds.  So, the design day simulation may already be 
doing what you want.

If you prefer more direct control, you can make a custom epw weather 
file.  The easiest way to do this is to take an existing epw file for 
the location you wish to model and use the Weather Converter to 
convert it into csv format.  You can then edit the csv data in a 
spreadsheet program and then convert it back to epw format.

Mike


On 14 Jan 2003, at 12:51, lengjing lengjing wrote:

> Hi,
> 
> I?m trying to compare several softwares including
> EnergyPlus in terms of their transient simulation
> capabilities.  I have used EnergyPlus for design day
> analysis before, which is steady state and can be done
> by selecting the location and then the design-day
> temperature profile is automatically generated by
> EnergyPlus. 
> 
> However, in order to compare the transient performance
> of EnergyPlus with several other softwares that are
> not based on the epw weather format, I would like to
> use some randomly generated hourly temperature values
> as the same input for all the programs. To put it
> simple, I want to compare the temperature responses of
> the indoor air and the walls (or even different layers
> of the walls) under both steady-state and transient
> conditions. For example, use a 24-hour temperature
> data as the periodic weather input and find the
> temperature responses until the temperatures of indoor
> air and the walls have reached steady states. It might
> take several days, say, x days, for the temperatures
> to reach steady states. Is this possible with
> EnergyPlus? If so, could you please tell me how to put
> in my own temperature values? If not, can I just run a
> design day and look at the temperatures of air and
> walls during these x days from warmup until steady
> state? Thank you very much in advance for your help.
> 
> 
> Regards,
> 
> Zhuo
> 
> 
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