[TRNSYS-users] Chilled Ceiling QCOMI

[Kersken, Matthias]

Dear Mr. Vazquez!
 
QCOMI contains only convection and IR-exchange to other surfaces of the
zone.
Solar gains (diffuse radiation for a ceiling), IR-energy from internal Heat
sources (Heating, artificial lightning, ...) and wallgains are NOT included.
This energy flows are calculation in QABSI.
(Manual 5-26)
In order to have a complete energy balance for Your ceiling You should
compare the sum (attention! +/-) of this values with Your cooling demand.
 
With kind regards,
    Matthias Kersken
 

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Dipl.-Ing. Matthias Kersken
Wissenschaftlicher Mitarbeiter / Abteilung Energiesysteme

Fraunhofer-Institut für Bauphysik 
Institutsteil Holzkirchen

Fraunhoferstraße 10
83626 Valley

eMail: Matthias.Kersken at ibp.fraunhofer.de
Telefon 08024 / 643-204
Telefax 08024 / 643-366
www.ibp.fraunhofer.de <http://www.ibp.fraunhofer.de/> 


Dipl.-Ing. Matthias Kersken
Research Associate / Department Energy Systems 

Fraunhofer Institute for Building Physics 
Branch Holzkirchen

Fraunhoferstraße 10
D-83626 Valley

eMail:  <mailto:Matthias.Kersken at ibp.fraunhofer.de>
Matthias.Kersken at ibp.fraunhofer.de
Phone +49 8024 / 643-204
Fax +49 8024 / 643-366
 <http://www.ibp.fraunhofer.de/> www.ibp.fraunhofer.de

 

 

 

 

 

 

 

 

 

 

 

 

 

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Von: Mavi Cambronero Vázquez [mailto:maviqnk at gmail.com] 
Gesendet: Freitag, 19. November 2010 10:52
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] Chilled Ceiling QCOMI


Hi,
 
Something wrong is happening when I run my simulation with a chilled
ceiling. Until now I though the output QCOMI was the energy from the room to
the wall and it should be similar to the demand of cooling of my room. Why
are so different QCOMI and the theorical calculation:
 
Energy = flow_ceiling*cp_water*(Texit_water-Tentry_water)?
 
THanks

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