[TRNSYS-users] Use of Type 99

[David BRADLEY]

Meriem,
   TRNSYS's outputs are almost always the average value of the variable 
over the timestep. Type99 makes some assumptions about what kind of data 
is provided in the file (averages over the timestep, instantaneous 
values at the end of the timestep, etc.) so you have to make certain 
that the data you are providing has the same assumptions. If you are 
working with field measured data and need a little more flexibility in 
reading it you can use Type9. Type9 does not do the radiation processing 
that Type99 does so you will have to connect your Type9 to a Type16 
radiation processor. Type9 does, however, allow to you specify what kind 
of data you are providing (in terms of averages over a timestep, totals 
for each time step, or instantaneous values at the end of the timestep) 
for each of the values that you read.

   As far as your questions 3 and 4 are concerned, the correlations that 
take raw radiation data and use it to compute the radiation falling on 
an arbitrary tilted surface require that you specify two components of 
the radiation. The correlations that use Ibn (Ibeam_normal) and one 
other component (I for example) are the preferred correlations. That, 
however, does not mean that you can't read all of the components if you 
have them measured. Simply use I and Ibn for the radiation mode.
Best,
  David



On 4/27/2014 18:05, MERIEM SOUSSI wrote:
> Dear Trnsys-users,
> I'm using type 99 to read a weather file in user format.
> I created the weather data file in the appropriate format and tested 
> it in order to verify the data produced by type 99. The file is 
> created with one hour time interval and the simulation needed is also 
> of 1h interval, so I need type 99 to read the exact values supplied 
> without modification, I only need it to process several surfaces.
> I have the following questions:
> 1- How can I get the exact values of ambient Temperature that I supply 
> in the data file? I tested with "No interpolation"
> <interp> 0  <add>  0  <mult>  1<samp>   0
> and i didn't get the right values?
> 2- How can I get the exact values of relative humidity, I tested with 
> no interpolation and <interp>=0. and I get wrong values.
> 3- I have the values of IBEAM_H, IBEAM_N, IDIFF_H and IGLOB_H. Is it 
> correct to write them all in the weather data file or this may cause a 
> problem and I should respect the choice: (Ib and Id, I and Id, I and 
> Ibn) as mentioned in the help document?
> 4- If I have to choose between the irradiation values mentioned 
> above, which irradiation I need to supply in addition to IBEAM_N.
> Actually, I need to supply the DNI (IBEAM_N) since I'm using a field 
> of parabolic trough solar collectors and I want to be sure of the 
> values used.
> Thank you in advance for help
> Cordially
>
>
> Meriem SOUSSI
> Ingénieur énergéticien/doctorant
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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