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[EnergyPlus_Support] Re: Manual HVAC Sizing Error

Hi

I have tried your method and it worked, thanks Jean. But now i have another problem with the input cooling load and heating load exceeding the range. I have attached the E+ error message, does any one know how to fix this or what is the valid range for Rated air volume flow rate per watt of rated total cooling capacity ?


   ** Severe  ** Sizing: Coil:Cooling:DX:SingleSpeed "194 AHU COOLING COIL": Rated air volume flow rate per watt of rated total cooling capacity is out of range. See Input-Output Reference Manual for valid range.
   ** Severe  ** Sizing: Coil:Cooling:DX:SingleSpeed "200 AHU COOLING COIL": Rated air volume flow rate per watt of rated total cooling capacity is out of range. See Input-Output Reference Manual for valid range.
   ** Severe  ** For object = Coil:Cooling:DX:SingleSpeed, name = "200 AHU COOLING COIL", the combination of
   **   ~~~   ** rated air volume flow rate, total cooling capacity and sensible heat ratio yields coil exiting
   **   ~~~   ** air conditions above the saturation curve. Possible fixes are to reduce the rated total cooling
   **   ~~~   ** capacity, increase the rated air volume flow rate, or reduce the rated sensible heat ratio for this coil.
   **   ~~~   ** If autosizing, it is recommended that all three of these values be autosized.
   **   ~~~   **  During Warmup, Occurrence info=SUMMER DESIGN DAY IN UNTITLED, 01/15 00:00 - 00:30
   **  Fatal  ** Check and revise the input data for this coil before rerunning the simulation.

Regards,

Andrew

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jeannieboef" <jeannieboef@...> wrote:
>
> The best way is to run a Autosizing via a Design Day Summer and or Winter in DesignBuilder. Then go into the options and set it to "manual". This freezes all inputs from the Autosizing. You then change only those that you manually really want to and export the idf annual simulation. In the idf you can change the run dates. Then you can investigate which inputs DB leaves autosized and which are manual. Run that from eplaunch with the appropriate Weather file (these are freely downloadable).
> 
> Also, post the .err file (which should be in the same folder location as the exported idf) error messages for severe and fatal to give us a better idea what's happening. FYI DesignBuilder will happily import the simulation result file .eso so you can see the graphics (as long as you don't change geometry).
> 
> Regards
> 
> Jean
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "fenestralia53" <peterrlyons@> wrote:
> >
> > Morning,
> > 
> > I'm Andrew, and I'm using Peter Lyons password to access to this forum (with his blessing(!)).
> > 
> > We are using E+ to simulate a building where we are attemtping to input the size of the HVAC manually.  We are using the front end package DesignBuilder (DB) to affect this input (ie we input our sizes into DB). The E+ .idf seems to accept the HVAC sizing input to DB quite happily - when we open up the .idf and look under Coil:Cooling (or Coil:Heating) and then under the Rated Cooling (or Heating) Capacity, it echoes the size of the HVAC we input into DB.  All other aspects are Autosized, which pp 471 of the InputOutputReference of the E+ manual indicate is OK (ie, Mixing User-Specified and Autosized Inputs is OK)
> > 
> > When we run the simulation we either get a Fatal Error in sizing OR, more often, the HVAC sizing reverts back to being Autosized (which we have confirmed by carrying out an Autosized run - the values in the Autosize and our supposed manual HVAC come out the same).
> > 
> > Anyone come across this, managed to solve this and thus run sims with a user defined HVAC size??
> > 
> > Regards,
> > 
> > Andrew
> >
>




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