DOE reference model warnings: Potential issue with equipment sizing for Coil:Cooling:DX:TwoSpeed

asked 2018-07-10 17:55:26 -0500

mldichter gravatar image

The DOE_StandAloneRetail reference model, and most of the other DOE reference models, has the following warning.

   ** Warning ** SizeDXCoil Coil:Cooling:DX:TwoSpeed CORE_RETAIL ZN PSZ-AC 2SPD DX AC CLG COIL 489KBTU/HR 10.0EER
   **   ~~~   ** ...High Speed Gross Rated Total Cooling Capacity [W] will be limited by the minimum rated volume flow per rated total capacity ratio.
   **   ~~~   ** ...DX coil volume flow rate (m3/s ) = 4.958185
   **   ~~~   ** ...Requested capacity (W ) = 127905.777
   **   ~~~   ** ...Requested flow/capacity ratio (m3/s/W ) = 3.876E-005
   **   ~~~   ** ...Minimum flow/capacity ratio (m3/s/W ) = 4.027E-005
   **   ~~~   ** ...Adjusted capacity ( W ) = 123123.544
   ************* SizeDXCoil: Potential issue with equipment sizing for Coil:Cooling:DX:TwoSpeed POINT_OF_SALE ZN PSZ-AC 2SPD DX AC CLG COIL 75KBTU/HR 11.2EER
   **   ~~~   ** User-Specified Low Speed Gross Rated Sensible Heat Ratio = 0.69000
   **   ~~~   ** differs from Design Size Low Speed Gross Rated Sensible Heat Ratio = 0.76279
   **   ~~~   ** This may, or may not, indicate mismatched component sizes.
   **   ~~~   ** Verify that the value entered is intended and is consistent with other components.

Here is a cleaned up version of the original idf.
DOE_StandAloneRetail

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