Re: [TRNSYS-users] type 109 with 5 minutes time step

I have problem again with simulation time step,

I use Type 9 data reader, with 5 minutes time step data,

1. How to write the simulation start time in (type 9) if I simulate it together with weather data in June (in type 109)?

2. I did a test with my data file, I connect type 9 with online plotter, I put data in type 9 like the note bellow,

and I set simulation start time 0 stop time is 120, when I set simulation time step to 5 minutes the simulation error,

but when simulation time step to 2.5 minutes, the simulation run,

Do I need to set simulation time step in control card below 5 minutes if the data is in 5 minutes interval?

3. I run my complete simulation, with type 9 and type 109, I set simulation time step to 2.5 minutes, i run simulation for a month,

but the simulation run only for several hour and then stopped, I got some warning:

Radiation while sun is down found 1 times (What is this?)

only the first 10 warnings with data info are printed

check: - Time of first data line

- Longitude and Latitude

REMARK: these radiation values are set to ZERO !

***** WARNING FROM UNIT 2 TYPE 109 DATA READER

RADIATION DATA READ IN FROM FILE ==>Weather UTP - June 1-30 (5 min).109

AT LINE # 2 ARE SET TO ZERO SINCE SUN IS DOWN, ORIGINAL VALUE: 28.91 W/m²

***** WARNING FROM UNIT 2 TYPE 109 DATA READER

RADIATION DATA READ IN FROM FILE ==>Weather UTP - June 1-30 (5 min).109

AT LINE # 3 ARE SET TO ZERO SINCE SUN IS DOWN, ORIGINAL VALUE: 28.91 W/m²

Simulation lst file:

*** Warning at time : 61.416667

Generated by Unit : Not applicable or not available

Generated by Type : Not applicable or not available

TRNSYS Message 441 : The inputs to the listed units have not converged at this timestep. The values at the last iteration will be used and the simulation will proceed.

Reported information : UNITS: 4 10 11 17

*** Fatal Error at time : 61.416667

Generated by Unit : Not applicable or not available

Generated by Type : Not applicable or not available

TRNSYS Message 450 : The maximum number of warnings allowed per simulation has been exceeded. Please fix these warnings or increase the limit on the number of warnings allowed per simulation (LIMITS command)

Reported information : Not available

*** Warning at time : 61.416667

Generated by Unit : Not applicable or not available

Generated by Type : Not applicable or not available

TRNSYS Message 442 : The listed differential equations have not converged at this timestep. The values at the last iteration will be used and the simulation will proceed.

Reported information : DIFFERENTIAL EQUATIONS: 1

Please help me to solve this problem, thank you very much

______________________________________________________________________________________________________________

Data in .txt file for type 9 (time interval 5 minutes):

25.07

40.18

42.77

0.00

27.82

27.91

15.28

46.04

30.81

54.12

33.61

54.50

49.43

54.36

85.52

57.23

83.40

83.58

105.23

98.98

96.83

108.26

113.00

121.50

On Mon, Oct 18, 2010 at 3:59 PM, Dimas Firmanda Al Riza <dimasfirmanda@gmail.com> wrote:

I have adjusted it by now, and it works! thanks a lot!
I adjust it like below

<interval> 0.08333 ! Data file time interval between consecutive lines

<firsttime> 0.08333 ! Time corresponding to first data line (hours)

-dimas-

On Mon, Oct 18, 2010 at 3:28 PM, hotline <hotline@transsolar.com> wrote:

Dimas,

did you also adjust the "Time corresponding to first data line" ?

<firsttime> 1 ! Time corresponding to first data line (hours)

In addition, you need to set the simulation time step to 5 minutes.

Marion

Von: Dimas Firmanda Al Riza [mailto:dimasfirmanda@gmail.com]
Gesendet: Montag, 18. Oktober 2010 02:33
An: trnsys-users@cae.wisc.edu
Betreff: [TRNSYS-users] type 109 with 5 minutes time step

Dear all,

I have 5 minutes time step weather data,

How to conduct simulation with 5 minutes time step using type 109,

do I need to change something in the .109 data file?

I've try to just change the data in .109 file from 1 hour time step with my 5 minutes time step data

but when I run simulation with 5 minutes time step the results become weird,

Thank you very much

Regards,

Dimas Firmanda A.

MSc student

Mechanical Engineering Department

Universiti Teknologi PETRONAS