[TRNSYS-users] Trnflow error_flow matrix is singular

[이혜인]

Hello Trnsys-Colleagues,

There is a problem with my HVAC modeling, so I ask for your help.

Trnflow's Test Data supplies and ventilates the building, and the air
volume is given to Simulation Studio's Calculation.
The simulation does not stop if I give one air volume value(constant air
volume), but if I give the air volume with the variable air volume, the
simulation stops and the following error occurs:

 ***** ***** WARNING ***** UNIT 32 TYPE 56, TIME =   1.000E+00
 COMIS MESSAGE  ***** ERROR *****
 Flow matrix is singular ! This might be caused by a zone that has no
 ventilation at all in this condition.
 Age of air and air change efficiency output is invalid !

[image: image.png]
This is Calculation for air flow rate. I want to give 30% of the maximum
air volume when it is below 23 degrees, give a linear air volume between 23
degrees and 25, and give a maximum air volume when it exceeds 25 degrees.
The signal below is that gives air volume in Trnflow's Test Data.
[image: image.png]
[image: image.png]
[image: image.png]
[image: image.png]

Any help would be appreciated.

Thanks and have a nice day!

------------------------------------------------------------
-------------------------------
Lee Hye-In

Graduate school of Yeungnam University
Dept. of Architectural Engineering
Building Energy Systems Laboratory
280 Daehak-ro, Gyeongsan-si, Gyeongbuk-do 38541, Korea
(Tel) +82-53-810-3543; +82-10-8330-7087
gpdls0101 at gmail.com
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