Re: [TRNSYS-users] Questions about TRANSFERFUNCTION COEFFICIENTS, thermal time constant, NTYPE 207: FLTOZ and type 9

["hotline" <hotline@transsolar.com>]

Hi,

 

K is relateted to the chosen TIMEBASE and the wall constructions used in the simulation. How many K are required is chosen by the algorithm for the wall calculation so that the method fits.

 

to 1) that effect can take place. If heating is assumed to be ideal and without limitations it can heat up quite fast. Compared to this if you cool by low level ventilating through the window this can take much more time to decrease the temperature.

to 2) If you are using the ideal heating then just take QHEAT as ouput from TRNBUILD.

to 3) if you link your data from type9 directly to a printer Type 25 then the data should be available in the the output file 

 

Christian

 

TRANSSOLAR Software Team

hotline@transsolar.com

 

www.trnsys.de

Transsolar KlimaEngineering - Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden                                   

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart / Amtsgericht Stuttgart - HRB 23347 / UsSt.-Id: DE152272639

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

 

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   Von: 王洋 [mailto:wanghongyang1767@gmail.com]
Gesendet: Mittwoch, 17. November 2010 19:21
An: trnsys-users@cae.wisc.edu
Betreff: [TRNSYS-users] Questions about TRANSFERFUNCTION COEFFICIENTS, thermal time constant, NTYPE 207: FLTOZ and type 9

Dear All,
 
I have some questions to ask you! Many thanks in advance!

In .INF file
To TRANSFERFUNCTION COEFFICIENTS
   K            A              B              C              D
   0       1.7050117E+02    2.1087019E+01    1.7050117E+02    1.0000000E+00
   1      -1.1800059E+02    3.5808933E+01   -1.1800059E+02   -1.3683139E-01
   2       6.0267372E+00    1.6298573E+00    6.0267372E+00    4.7362566E-05
   3      -1.2736107E-03    2.3363784E-04   -1.2736107E-03
  SUM      5.8526043E+01    5.8526043E+01    5.8526043E+01    8.6321597E-01

What's the meaning of A,B,C,D and K? Why K has 0 1 2 3? Is it measuring times(once  twice etc.) or other  meanings?
 
Besides that, I saw K=4 or 2 etc.

PLUS:

1) I designed one zone temperature control system using PID controller with DCV control strategy to control the window opening factor(OP): the set-point temperatre is 21°C when occupied, 19°C when unoccupied. But to my surprise, it needs only about 2 hours to reach 21°C from 19°C, BUT it needs 13 hours to reach 19°C from 21°C. It will have much more heating consumption in actual situation.
Please explain it in detail! I think like this why the thermal time constant will change? What's relationship between the thermal time constant with 2 HOURS and 13 HOURS?

I attached the picture of them. Please check it!

2) I used NTYPE 207: FLTOZ to calculate the total outdoor air flow into zone when the window opening factor changes, Is it right? If so, which type can i use to calculate the Q of heating consumption? (dQ=dm*C*(Tindoor-Toutdoor)-->lntegral dQ?) Or how to calculate the sum of dm of indoor air flow into outside and  the sum of(Tindoor-Toutdoor) one day?

3) To type 9: I used my own weather data every one hour. But Why the original data cann't be shown in .out file and NO .plt file after running? Because I want to use the original data.

Many thanks!
 
Br.
 
wang