[TRNSYS-users] first iteration with tmy2

javier mota fjmi_3i at hotmail.com
Thu Nov 17 23:45:07 PST 2005

dear diego; i am javier mota from 3i-ingenieria, madrid.
I am sorry, first iteration looks ok.
but i show you something that take my attention. maybe because i don´t know 
the way type 109 works, so first sorry by my ignorance.
I show you the results.first, tmy2:
8280  Albacete/Los Llanos       1   N 38 57 W 1   51  704

At local stanadr time =1 T=4.6 in tmy2
at tme =1 in output trnsys T=4.6 with time step=1 and 	trnsys T=4.6 with 
time step=0.25.
so time output TRNSYS=1 match meteonorm at hour 1.
at time =2, for example:
T=4.7 in tmy2 local stan. time=2
T=4.65  with time step=1 in output trnsys; time output=2
T=4.70  with time step=0.25 in output trnsys;time output=2
so at time=2, for example, numbers doesn´t match excatly
but i suppose and that must be ok this last 3 numbers 4.7,4.65,4.7 may be 
the same.
so, sorry, and thanks.

>From: "Diego A. Arias" <daarias at wisc.edu>
>To: javier mota <fjmi_3i at hotmail.com>
>Subject: Re: [TRNSYS-users] first iteration with tmy2
>Date: Thu, 17 Nov 2005 16:53:24 -0600
>Dear Javier,
>I was wondering if you solved this problem.
>I am intrigued by problem during the first iteration.  I had tried to 
>reproduce this problem but Type109 gives me the right results for this 
>initial value; I check the values of temperature.  Could you please send me 
>the project file and weather data that you are using?  I may be able to 
>help you.
>Best regards,
>javier mota wrote:
>>I am javier mota from 3i-ingenieria,madrid.
>>I make a program that reads tmy2. data file is TMY2, 8760 lines, one line 
>>one hour.
>>I run simulation with time step 0.25
>>i have seen that first iteration does not refer to file that reads type 
>>109 in tmy2 format, all outputs are zero.
>>But line 4th in the output file,(1 hour passed time) should match 1st line 
>>in weather data file, and so sholud be refered to the hour in local 
>>standar time?
>>Due to interpolation in this element i am not sure that I could check 
>>results looking  tmy2 and outputs; outputs does not match exactly tmy2 
>>data expexted.
>>May anybody confirm me this point?
>>Thank you in advance.
>>Dale rienda suelta a tu tiempo libre. Encuentra mil ideas para exprimir tu 
>>ocio con MSN Entretenimiento. http://entretenimiento.msn.es/
>>TRNSYS-users mailing list
>>TRNSYS-users at engr.wisc.edu
>Diego A. Arias
>TRNSYS Coordinator
>Solar Energy Laboratory
>University of Wisconsin - Madison
>1500 Engineering Drive
>Madison, WI 53706

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