[TRNSYS-users] Weather data

Tue Jan 22 08:25:50 PST 2019

Siliang and Mohammad,

   I may be misunderstanding what you are doing but if you are patching 
measured temperature data into an existing "standard" weather data file 
so that you can use the standard weather file's solar radiation then I 
would urge being /very /cautious about this. You can easily end up with 
very unrealistic data. In summer you could easily end up with the solar 
saying that the day was very clear but a low temperature coming from a 
period that was actually quite cloudy during that interval in your 
actual data.

  It sounds as though you are being careful about replacing both the dry 
and wet bulb temperatures (as well as RH). If you only replace drybulb 
temperatures without taking care of wet bulb, dew point, and RH then all 
the humdity data in the file will be wrong.

kind regards,

  David

On 01/22/2019 03:33, Siliang Yang wrote:
>
> Hi Mohammad,
>
> I’ve been using Type15-3 for my model though it is in TRNSYS17.
>
> Basically I used Elements (an open source) to modify the variables of 
> the weather data (epw. format) such as WB/DB temperature and RH etc, 
> of which you could easily edit any periods of the year. Then, I 
> imported the modified epw. file into Type15-3 of my TRNSYS model, and 
> it works properly and I’ve validated against the measured weather data 
> as well. I’m not so sure if it is applicable for the case in TRNSYS15, 
> but you might have a try.
>
> Hope it helps..
>
> Best regards,
>
> Siliang
>
> *Siliang Yang*
>
> /PhD Candidate and Casual Academic, UNSW Built Environment /
>
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> *From:*TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> *On 
> Behalf Of *Mohammad Rezvanpour via TRNSYS-users
> *Sent:* Tuesday, 22 January 2019 6:43 PM
> *To:* TRNSYS users mailing list at OneBuilding.org 
> <trnsys-users at lists.onebuilding.org>; David BRADLEY 
> <d.bradley at tess-inc.com>
> *Cc:* Mohammad Rezvanpour <moh.rzv at gmail.com>
> *Subject:* [TRNSYS-users] Weather data
>
> Dear all,
>
> I want to simulate a photovoltaic panel, and I need weather data for 
> Nov-Dec 2018. However, I could not find any TYPE to enter temperatures 
> there or use updated data. It should be noted that my TRNSYS version 
> is 15.
> How can I have updated temperature data or simply put the temperatures 
> manually which I got from the Internet?
>
> Best,
> Mohammad
>
> -- 
>
> Regards.
>
> M.Sc. student of Energy and Environmental Engineering at University of 
> Tehran
>
> Hand-Phone: +989303037373
> University Email account: m.rezvanpour at ut.ac.ir 
> <mailto:m.rezvanpour at ut.ac.ir>
>
-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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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