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Re: [EnergyPlus_Support] HVAC doubt



You could first do a sizing run, then take your values from the HTML results and use them as inputs. This would allow you to change your size until you do not doubt your HVAC size. If you want a smaller HVAC system you could incrementally decrease your airflow and coil capacities [in equal proportions] until you begin to have setpoint hours not met. Potentially you could do this until you reach the max 300 hours prescribed by ASHRAE 90.1....



Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
  





On Thu, Aug 15, 2013 at 9:51 AM, Jaime Zuluaga Machado <jaimezuluagam@xxxxxxxxx> wrote:
 

Hi!

How I do work the HVAC system with the Weather File and no with Design Day.

When i change my Design Day the next error appears:
nput file has requested Sizing Calculations but no Simulations are requested (in SimulationControl object). Succeeding warnings/errors may be confusing.
   ** Severe  ** Sizing: Coil:Cooling:DX:SingleSpeed "OS:COIL:COOLING:DX:SINGLESPEED 1": Rated air volume flow rate per watt of rated total cooling capacity is out of range.
   **   ~~~   ** Min Rated Vol Flow Per Watt=[4.027E-005], Rated Vol Flow Per Watt=[6.997E-005], Max Rated Vol Flow Per Watt=[6.041E-005]. See Input-Output Reference Manual for valid range.
   ** Severe  ** CoilSystem:Cooling:DX: Missing temperature setpoint for DX unit= OS:COIL:COOLING:DX:SINGLESPEED 1 COILSYSTEM
   **   ~~~   **   use a Setpoint Manager to establish a setpoint at the unit control node.
   **  Fatal  ** Previous severe set point errors cause program termination
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=2
   ..... Last severe error=CoilSystem:Cooling:DX: Missing temperature setpoint for DX unit= OS:COIL:COOLING:DX:SINGLESPEED 1 COILSYSTEM
 


Jaime Zuluaga M




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