[TRNSYS-users] Weather Stations

Fri Aug 7 23:06:13 PDT 2015

Thanks Ben, all good suggestions. One thing I’m attempting to do with the TMY data is in modelling existing buildings, where I can ask “what if” questions, e.g., if we add more insulation to the ceiling or replace windows, what will be the energy savings and cost-benefit relationship. So, in starting with good TMY data and getting reasonable correlation of the model to past gas usage, I have a good starting place. That with recorded meteorological extremes for the location, I can design new heating and solar systems fairly effectively.

Thanks for your ideas.

Cheers,

Roger Hill

From: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] On Behalf Of Ben Heymer
Sent: Saturday, 8 August 2015 12:38 a.m.
To: TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] Weather Stations

Roger,

The suppliers of the weather data are happy to discuss their technical approach for generating data, in my experience. The methods do vary a bit so it's a good idea to ask. Most will provide you with whitepapers and various other technical references.

There is no "right" answer, especially when it comes to weather. If you have hesitations, you should run your simulation with multiple weather files from the broader geographic region, including trusted TMY files from airports (even if they are not very close to your site). This will give you a range of results to work with and hopefully show that your system will perform satisfactorily over a range of possible weather outcomes. If system performance is very sensitive to the weather file data, then it's probably a risky investment in the real world.

Ben Heymer, PE

On Fri, Aug 7, 2015 at 3:54 PM, Roger Hill <wda7465 at yahoo.com> wrote:

Thank-you Tim,

I’ve managed to find some of the files I’ve been looking for. However, one question that sticks in my mind is how do I know if the data is accurate or not without doing my own monitoring over years to validate? Many stations have sporadic data collection, so have to interpolate with nearby stations, etc. It’s hard to predict the future of course, but I’d like to have some reasonable assurance that the designs I create will realistically apply to a typical environmental year. Any ideas as to what I should look out for or the questions I should be asking?

Cheers,

Roger Hill

From: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] On Behalf Of mcdowell at tess-inc.com
Sent: Wednesday, 5 August 2015 3:14 p.m.
To: TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] Weather Stations

Roger Hill -

There are a number of sources for weather data.  You can check

Energy Plus Weather: http://apps1.eere.energy.gov/buildings/energyplus/weatherdata_about.cfm

White Box Technologies: http://weather.whiteboxtechnologies.com/

Weather Analytics: http://www.weatheranalytics.com/wa/

and I am sure there are many more.

Regards,

Tim

---
Timothy P. McDowell
Executive Vice President
Thermal Energy System Specialists, LLC
22 N Carroll St, Suite 370
Madison, WI 53703
608-274-2577

On 2015-08-05 04:32, Roger Hill wrote:

Hello,

I’m building an extensive hydronic and PV solar model for a campus of a dozen buildings in Australia west of Sydney in the Blue Mountains. Meteonorm has a site (#947430) that is close to our site (Blackheath), but this is a secondary station. I don’t know if this is reliable data or not and I haven’t been able to get anyone at Meteonorm to respond to my emails.

Does anyone know where I can find a reliable weather data set for close to our location that will work with TRNSYS type 15?

Cheers,

Roger Hill

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