negative coil bypass factor calculated

asked 2020-09-04 16:53:39 -0500

Wooyoung gravatar image

updated 2020-09-04 17:42:02 -0500

Hi,

I have an err file saying the following.

 ** Warning ** The Standard Ratings is calculated for Coil:Cooling:DX:SingleSpeed = SPLIT MNW COOLING COIL but not at the AHRI test condition due to curve out of bound.
   **   ~~~   **  Review the Standard Ratings calculations in the Engineering Reference for this coil type. Also, use Output:Diagnostics, DisplayExtraWarnings for further guidance.
   **   ~~~   ** CheckCurveLimitsForStandardRatings: The max and/or min limits specified in the corresponding curve objects
   **   ~~~   **  do not include the AHRI test conditions required to calculate one or more of the Standard Rating values.
   **   ~~~   ** Coil:Cooling:DX:SingleSpeed=SPLIT MNW COOLING COIL:  Integrated Energy Efficiency Ratio (IEER) calculated is not at the AHRI test condition.
   **   ~~~   **  Check limits in Total Cooling Capacity Function of Temperature Curve, Curve Type = Curve:Biquadratic, Curve Name = SPLIT DX COIL CAP-FT
   **   ~~~   **  Check limits in EIR Function of Temperature Curve, Curve Type = Curve:Biquadratic, Curve Name = SPLIT DX COIL EIR-FT
   ** Severe  ** Coil:Cooling:DX:SingleSpeed "SPLIT MNW COOLING COIL" -- negative coil bypass factor calculated.
   **   ~~~   **  During Warmup, Environment=NEW.YORK-JOHN.F.KENNEDY.INTL.AP_NY_USA ANN HTG 99.6% CONDNS DB, at Simulation time=01/21 00:00 - 00:10
   **  Fatal  ** Coil:Cooling:DX:SingleSpeed "SPLIT MNW COOLING COIL" Errors found in calculating coil bypass factors

I think this is related to weather data (as when I feed another NewYork weather data, although I get warnings, the simulation never fail) and the minimum/maximum X and Y values (according to this answer (https://unmethours.com/question/33068....

Any clue for this issue would be highly appreciated. Thanks.

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