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Re: [EnergyPlus_Support] Warning Calculated Humidity Ratio
Hello Alex,
What this message is telling you is that the calculated humidity ratio is
below the physical realm of possibility, a very small negative value, and
it is setting it to a very small physical value. Either the dry and wet
bulb, or the numerical procedures are slightly off at this physical
boundary, but either way the warning generated is within numerical
precision and I doubt that this will cause any distortion of results. The
reason that it should not cause any distortion is that you are probably in
heating scenarios and this is normally all sensible heat transfer.
Thanks Richard Liesen
At 05:14 PM 4/10/2003, Alexander Beisteiner wrote:
>Dear E+ User,
>
>A weather file simulation of a purchased air system produces the
>following warning message:
>
>Program Version,EnergyPlus 1.0.3.019, 10.04.2003 15:52
> ************* Testing Individual Branch Integrity
> ************* All Branches passed integrity testing
> ************* No node connection errors were found.
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -24.40 Wet-Bulb= -25.40
>Pressure= 97500.00
> ** ~~~ ** Calculated Humidity Ratio= -2.3594E-006 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -25.30 Wet-Bulb= -26.30
>Pressure= 97700.00
> ** ~~~ ** Calculated Humidity Ratio= -3.6357E-005 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -26.10 Wet-Bulb= -27.10
>Pressure= 97800.00
> ** ~~~ ** Calculated Humidity Ratio= -6.3930E-005 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -27.00 Wet-Bulb= -28.00
>Pressure= 97900.00
> ** ~~~ ** Calculated Humidity Ratio= -9.2471E-005 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -27.30 Wet-Bulb= -28.30
>Pressure= 98000.00
> ** ~~~ ** Calculated Humidity Ratio= -1.0164E-004 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ** Warning ** Calculated Humidity Ratio Invalid (PSYWTP)
> ** ~~~ ** (mm/dd/hh)= 1/05/01 Dry-Bulb= -27.60 Wet-Bulb= -28.60
>Pressure= 98100.00
> ** ~~~ ** Calculated Humidity Ratio= -1.1054E-004 ... Humidity
>Ratio set for a relative humidity ratio of .01
> ************* Psychrometric Error Summary
> ************* Routine - Number of errors
> ************* PSYDPT-0
> ************* PSYRHT-0
> ************* PSYTWD-0
> ************* PSYVTW-0
> ************* PSYWDP-0
> ************* PSYWTH-0
> ************* PSYWTP-363
> ************* PSYWTR-0
> ************* SATUPT-0
> ************* SATUTH-0
> ************* SATUTP-0
> ************* tp12c0-0
> ************* tp12c1-0
> ************* tp12h0-0
> ************* tp12h1-0
> ************* freeze-0
> ************* EnergyPlus Completed Successfully-- 6 Warning; 0 Severe
>Errors; Elapsed Time=00hr 00min 13sec
>
>Looking at the weather file (of Irkutsk), I could not find temperature
>and pressure values for the time stated: 1/05/01. What does the warning
>tell? Does it distort results? Can the message be neglected?
>
>I am looking forward to your help.
>
>Alexander
>
>_______________________________________
>DI (FH) Alexander Beisteiner
>Wissenschaftlicher Mitarbeiter
>
>Forschungs- und Technologietransfer Pinkafeld GmbH
>Steinamangerstraße 21
>A - 7423 Pinkafeld
>Tel.: +43-3357-45370 DW 1324
>Fax.: +433357-45370 DW 1010
>
>
>
>
>
>[Non-text portions of this message have been removed]
>
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