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Dear All, I am currently using TRNSys to model an HVAC installation
but when using the weather data from humid regions such as Singapore or Hong Kong,
I have a recurrent message on different units such as Type52b cooling coil,
Type667c heat recovery wheel and Type88 single zone model. Message : The referenced UNIT as called the PSYCHROMETRICS
routine one or more times during the simulation withan enthalpy greater than
that for saturated air and the given dry bulb temperature. The air was assumed
saturated and the enthalpy set for this condition. I assume that this error leads to more errors in the final energy
given as a result and eventually, even manage to crash my simulation when I
lower the time step too much, as the number of messages is limited to 500. I
based my calculations on the hypothesis that the humidity ratio asked in the different
units is the absolute humidity ratio with is kg of water / kg of dry air. I
have isolated Type52b cooling coil to search more deeply my possible mistakes
(constant humidity ratio of 0.02kgw/kga and wet bulb temperature varying from 27
to 33). According to my psychometric chart (at sea level), the air shouldn’t
reach saturation but TRNSys tells me the opposite. Has anyone encountered a similar problem in a simulation and
was able to solve it? Best Regards, Jace LE GALL -- Les donnees et renseignements contenus dans ce message sont personnels, confidentiels et secrets. Toute publication, utilisation ou diffusion, meme partielle, doit etre autorisee. Si vous n'etes pas le bon destinataire, nous vous demandons de ne pas lire, copier, utiliser ou divulguer cette communication. Nous vous prions de notifier cette erreur a l'expediteur et d'effacer immediatement cette communication de votre systeme. Any data and information contained in this electronic mail is personal, confidential and secret. Any total or partial publication, use or distribution must be authorized. If you are not the right addressee, we ask you not to read, copy, use or disclose this communication. Please notify this error to the sender and erase at once this communication from your system. |