[TRNSYS-users] TRNSYS Active Layer Flowrate

[Kersken, Matthias]

Dear Mr. Rohan!

 

In the 13 kg/m²h the “m²” are related to the wall/ceiling area and not to
the pipe-diameter.

For the conversion to kg/s You may not use the pipe-area (7.1e-5 m²) but
Your wall area.

 

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


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: Devin Rohan [mailto:dmrohan at gmail.com] 
Gesendet: Sonntag, 12. Juni 2011 02:10
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] TRNSYS Active Layer Flowrate

 

The Type 56 manual suggests that the specific mass flow rate be greater than
13 kg/h-m^2.  Say I wanted to convert this to mass flow rate in kg/s and the
fluid was flowing through a 3/8" (or 9.525 mm) inside diameter pipe.  Here's
what I'm doing...

 

A_pipe= (pi*D^2)/4 = (pi*.009525^2)/4= 7.1256 E-5 m^2

 

13 kg/h-m^2   x   (7.1256 E-5 m^2)   x   (h / 3600 sec)  =  2.573 E-7 kg/s

 

This seems like an awfully low mass flow rate, since what I've seen in
literature for floor heating applications is around .05 kg/s.  Am I missing
something here?

-- 
Devin M. Rohan
drohan at purdue.edu

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