[TRNSYS-users] TRNSYS Weather File Construction

Craig Francis craiden08 at gmail.com
Tue Dec 1 17:37:00 PST 2020

Thanks for the suggestion Christian. Where the temperatures are concerned I
was able to get hourly values from the website climate.canada.gc.ca,
however only hourly meteorological data was available. Where solar
radiation is concerned I could only get daily data. My current challenge is
that I need to build a custom weather file for 2019 that is readable by
TRNSYS to validate a model. I know that I can use the Type 9e input in
TRNSYS, and for the meteorological data, it would work perfectly as I have
the hourly data, however I do not have the hourly solar data to feed into
Type 9e. My challenge is to convert this daily solar radiation into hourly
radiation data.


On Tue, Dec 1, 2020 at 7:01 PM Dr.-Ing. Karl-Christian Rauch i.R. <
rauch-muenster at t-online.de> wrote:

> Hi Craig,
> perhaps you give you a try to look at
> ASHRAE Handbook 1985 Fundamentals (SI-Edition).
> Chapter 26 Table 2 and Table 3. In the text you will find calculation
> examples for generating hourly values out of design dry-bulb temperature
> and mean daily range (see Table 1, Chapter 24), and Chapter 26, Table 3
> (hourly) percentage of the Daily range. This same hourly percentage is also
> used in program NBSLD (NBS, Tamami Kusuda), where you give the dry-bulb
> temp. and the mean daily range in the input data.
> Kind regards
> Christian
> Dr.-Ing. Karl-Christian Rauch i.R.
> Ladestr. 22
> 48324 Sendenhorst
> David BRADLEY via TRNSYS-users <trnsys-users at lists.onebuilding.org>
> schrieb am Di. 1. Dez. 2020 um 22:41:
>> Craig,
>>  I would try and find an hourly data file for a location that is near to
>> the RETScreen location. TRNSYS reads half a dozen or so different weather
>> data file syntaxes and there is a data base of Canadian weather in *.epw
>> format that has a pretty extensive site list. There is a component in
>> Trnsys that will generate hourly data based on monthly averages but not one
>> that will do so based on daily data.
>> kind regards,
>>  David
>> On 12/01/2020 11:51, Craig Francis via TRNSYS-users wrote:
>> Hi Everyone:
>> I am new to TRNSYS and looking for a bit of help around constructing a
>> weather file readable by TRNSYS. I have some NASA weather data for a site
>> that I extracted from RETScreen, however these are daily data. Is there
>> anyway to have TRNSYS convert these to say hourly data, or data consistent
>> with the simulation steps?
>> Thanks in advance.
>> Craig
>> _______________________________________________
>> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>> --
>> ***************************
>> David BRADLEY
>> Principal
>> Thermal Energy Systems Specialists, LLC
>> 3 North Pinckney Street - suite 202
>> Madison, WI  53703 USA
>> P:+1.608.274.2577
>> F:+1.608.278.1475d.bradley at tess-inc.com
>> http://www.tess-inc.comhttp://www.trnsys.com
>> _______________________________________________
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