[Bldg-sim] FW: HVACTempate autosizing error

[Joe Huang]

Adam,

You might get more response if you post your question to the EnergyPlus_Support bulletin 
board, which is focused specifically on EnergyPlus issues.

I think what's happening is that you've not specified any Design Days  
(SizingPeriod:DesignDay), so EnergyPlus doesn't know what to use for the design 
calculations.  Please note that "autosizing" works differently between EnergyPlus and 
DOE-2.  In DOE-2, it means that the program figures out the peak load over the simulation 
period which it uses to then "size" the equipment.  In EnergyPlus, it means that, given 
the design day specifications, the program will calculate the equipment size.   To me, 
that always seems more like "sizing", not "autosizing".

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 3/1/2013 9:56 AM, Adam Barker wrote:
>
> Hello everyone,
>
> I'm a new user to Energy Plus and am trying to work through a simple model using the 
> HVAC Templates.  The configuration is a packaged VAV system with hot water loop and NG 
> boiler, with heating cooling and airflows autosized.
>
> My simulation is not running as it is giving me the following error:
>
> "CheckEnvironmentSpecifications: Sizing for Zones has been requested but there are no 
> design environments specified."  The same is given for system and plant objects.
>
> I was under the impression from the I/O reference that the EXPIDF processor takes care 
> of this and that these objects shouldn't be entered.  This seems to work for several of 
> the example files as well (they do not define sizing, but do autosize).  What could I 
> not be specifying, or specifying incorrectly to get this error? If I check No for Sizing 
> Calcs under SimulationControl it also doesn't like this and will ask this to be checked 
> as yes, so either way I don't know how to get around it.  IDF is attached.
>
> Thanks,
>
> Adam Barker
>
>
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