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Re: [EnergyPlus_Support] Re: How to run DesignDay simulations - Summer and Winter



For a 'normal' simulation -- with the run period and using the design days to size, you would enter:
 
SimulationControl,
   Yes, !- Do the zone sizing calculation
   Yes, !- Do the system sizing calculation
   Yes, !- Do the plant sizing calculation
   No, !- Do the design day calculation
  Yes;  !- Do the weather file calculation

For a test simulation where you only want to run the design days and not the annual (or run period) simulation:
 
SimulationControl,
   Yes, !- Do the zone sizing calculation
   Yes, !- Do the system sizing calculation
   Yes, !- Do the plant sizing calculation
   Yes, !- Do the design day calculation
   No;  !- Do the weather file calculation
In both cases, it will run all the design days in your IDF file. ASHRAE Fundamentals Handbook has 17 combinations of winter and summer design condtions plus monthly design condtions.  These annual design conditions are included in the .DDY that comes with the EPW .ZIP -- if there are design conditions in the ASHRAE handbook for that location.
 
 
On Wed, Aug 31, 2011 at 10:10 AM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:
 

not commenting out the summer one should cause both to run.  and you will get simulation results for both. 

Yes, warmup happens for each "environment".



At 07:56 AM 8/31/2011, Jean marais wrote:
When I comment out SizingPeriod:DesignDay, Summer Design Day, my other SizingPeriod:DesignDay, Winter Design Day (the remaining one) gets simulated. I get results for the entire day after the simulation (which starts only after sizing and a proper building warmup). I assume this amounts to "design day calculation" specified in the SimulationControl object?

SimulationControl,
   Yes, !- Do the zone sizing calculation
   Yes, !- Do the system sizing calculation
   Yes, !- Do the plant sizing calculation
   Yes, !- Do the design day calculation
   No;  !- Do the weather file calculation

The question is how do I do both of these special designday simulations?
Obviously if the one follows the other, I will get 2 days worth of results...will a building warmup take place between them also?

Like I said I'm not using runperiod objects.



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