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Re: [EnergyPlus_Support] Warning Calculated Humidity Ratio
The message shows that the Dry-Bulb temperature is
below the Wet-Bulb temperature, an impossible
condition. The weather routine should check for this
condition and set the wet-bulb temperature equal to
the dry-bulb temperature whenever wet-bulb temperature
is calculated to be above the dry-bulb temperature.
--- "Richard J. Liesen" <rliesen@xxxxxxxx> wrote:
> 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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> >
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> >http://www.energyplus.gov
> >
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> >
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> >
> >
> >
> >
> >
> >
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