[EnergyPlus_Support] Sizing calculation

["aboyemeplus" <Merid.Aboye@xxxxxxxxxxxxxx>]

Hi, 

I am performing system sizing calculations for a 3-zone building 
where only one of the zones is conditioned. 

*Temperature control is provided with a dual setpoint thermostat. 
*The selected unitary equipment object  
is "FURNACE:BLOWTHRU:HEATCOOL". 
*The following parameters are set the same on both the Zone and 
System levels:Cooling/Heating Air Flow Methods, Cooling/Heating 
Supply Air HR, and Cooling/Heating. 
*The HVAC unit performance parameters are set to "Autosize" when 
ever that option is applicable. 

With this input, the sizing routine comes up with a max flow rate 
that meets the heating but not the cooling setpoint temperature. 
When I manually increase the design cooling flow rate value in the 
SYSTEM SIZING and ZONE SIZING objects, all setpoint temperatures are 
satisfied.

I am trying to understand why the "sizing" routine was limited to 
meeting only the heating setpoint temperature. Please provide help 
when you have a chance.

Thank you for your valuable time.

Merid







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