Warning - Calculated Relative Humidity out of range

I am constantly seeing this warning:

* Warning * Calculated Relative Humidity out of range (PsyRhFnTdbWPb) * ~~~ * Routine=CalcMultiSpeedDXCoil:lowspeedoutlet, Environment=RUN PERIOD 1, at Simulation time=04/12 13:00 - 13:10 * ~~~ * Dry-Bulb= 3.21 Humidity Ratio= 4.897E-003 Calculated Relative Humidity [%]= 101.01 * ~~~ * Relative Humidity being reset to 100.0%

Any thoughts on if this is something I can ignore?

626

nfonner

asked 2014-12-05 12:43:43 -0500

4.7k

Neal Kruis

updated 2015-01-09 12:31:21 -0500

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Hard to make a blanket comment without knowing more about what's happening in the model. A leaving dry-bulb temp of 3.2C (37.8F) is rather cold off a DX coil, so the airflow to capacity ratio for this coil may be too low.

9.7k

MJWitte

answered 2014-12-05 14:13:05 -0500

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Looks like increasing the Constant Minimum Airflow Fraction above the minimum ventilation rate was part of the issue. The warning persists, but was much less "severe" at a DB to 9.48 C for that same model.

Thanks Michael.