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@lists.onebuilding.org] On Behalf Of Ben Heymer 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@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@lists.onebuilding.org] On Behalf Of mcdowell@tess-inc.com 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 --- 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:
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