[TRNSYS-users] NType 904 -what's going on with equation

[Marion Hiller]

Karol,

 

in fact, it is accuracy problem that show the different error sum in
excel .

 

In your summary file the largest number is 1.693E+07  . 

The number is equal to 1693.E+04. 

Due to the fact that we do print values with accuracy of 1E+04 

you can’t expect the sum to be more accurate with in excel.

 

Therefore, you can’t recalculate the balance by excel.

 

 

Best, 

 

Marion

 

Dipl.-Ing. Marion Hiller 
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen
und Nutzerkomfort in Gebäude 
Munich - New York - Stuttgart + 49.711.67976.0 

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart 
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.:
DE152272639

Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher 

 

 

  _____  

Von: Karol Bandurski [mailto:karol.bandurski at put.poznan.pl] 
Gesendet: Donnerstag, 24. November 2011 09:48
An: Marion Hiller
Betreff: RE: RE: [TRNSYS-users] NType 904 -what's going on with equation

 

Thanks Marion, I am waiting.

 

It seems to me that the reason could be accuracy.

 

Karol

 

From: Marion Hiller [mailto:hiller at transsolar.com] 
Sent: Thursday, November 24, 2011 9:33 AM
To: karol.bandurski
Subject: AW: RE: [TRNSYS-users] NType 904 -what's going on with equation

 

Karol, 

 

I have to check it in more detail. 

I’ll try to get back to you today. 

 

Marion 

 

Dipl.-Ing. Marion Hiller 
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen
und Nutzerkomfort in Gebäude 
Munich - New York - Stuttgart + 49.711.67976.0 

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart 
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.:
DE152272639 

Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher  

  

 

  _____  

                                     

Von: Karol Bandurski [mailto:karol.bandurski at put.poznan.pl] 
Gesendet: Dienstag, 22. November 2011 11:06
An: Marion Hiller
Betreff: RE: [TRNSYS-users] NType 904 -what's going on with equation 

 

Marion, 

 

Thank you for tip – there was mistake in file generate in TRNSYS –
SUMMARY.BAL: QTRANS is with ‘-‘ and should be without. 

 

But there is still something wrong: my sums and TRNSYS sums differ. 

 

Take a look pleas (enclose)! 

 

Karol 

 

From: Marion Hiller [mailto:hiller at transsolar.com] 
Sent: Tuesday, November 22, 2011 9:18 AM
To: karol.bandurski; trnsys-users
Subject: AW: [TRNSYS-users] NType 904 -what's going on with equation 

 

Karol, 

 

you use the wrong signs fort he terms in your balance. 

Pease check the SIGNs  + and – given in the equation for the balance
(also see 05-MultizoneBuilding.pdf) 

 

Marion 

 

Dipl.-Ing. Marion Hiller 
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen
und Nutzerkomfort in Gebäude 
Munich - New York - Stuttgart + 49.711.67976.0 

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart 
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.:
DE152272639 

Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher  

  

 

  _____  

                                     

                                     

Von: Karol Bandurski [mailto:karol.bandurski at put.poznan.pl] 
Gesendet: Montag, 21. November 2011 13:02
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] NType 904 -what's going on with equation 

 

Hi, 

 

Could somebody explain me how it is possible: 

 

I get file SUMMARY.BAL (enclosed) as a result of NType 904, and there is
such equation: 

BAL_ENERGY= -DQAIRdt  +QHEAT     -QCOOL    +QINF      +QVENT
+QCOUPL    -QTRANS  +QGAININT  +QWGAIN    +QSOLGAIN 

 

But I calculate BAL_ENERGY in excel (enclosed), the same way, for each
zone, and result are completely different!!!??? 

 

How it is possible? 

 

Have I done something wrong? 

 

Regards, 

 

Karol 

------------------------------------------------ 

Karol Bandurski MSc. 

Institute of Environmental Engineering 

Poznan University of Technology 

www.ee.put.poznan.pl 

www.put.poznan.pl 

 


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