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

[hotline]

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 at 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

 

  _____  

Von: 王洋 [mailto:wanghongyang1767 at gmail.com] 
Gesendet: Mittwoch, 17. November 2010 19:21
An: trnsys-users at 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




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