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[EnergyPlus_Support] Re: Need help in understanding the error

It seems your air volume rate over the coil is not enough to bring the user defined required cooling. Either drop the coil temp or increase the volume flow rate of air or both.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Aditya Ravi <adityaravi87@...> wrote:
>
> What does the following error mean.�
> ** Severe �** Sizing: Coil:Cooling:DX:SingleSpeed "ZONE ONE PTAC COOLING COIL": 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=[1.433E-005], Max Rated Vol Flow Per Watt=[6.041E-005]. See Input-Output Reference Manual for valid range.
> � �** Severe �** For object = Coil:Cooling:DX:SingleSpeed, name = "ZONE ONE PTAC 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, Environment=RALEIGH_NC_USA ANNUAL HEATING 99% DESIGN CONDITIONS DB, at Simulation time=01/21 00:00 - 00:05
> � �** �Fatal �** Check and revise the input data for this coil before rerunning the simulation.
> 
> 
> Till now I was using the 'autosize' option. If I need to give my own cooling supply rate and heating air supply rate for a PTAC HVAC how should I go about doing it.
> 
> Kindly help.
> 
> Regards,
> 
> Aditya
>




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