Debating All Aspects of Passive Houses - And May the Best Argument Win!
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Do you know of any person in NZ who is very experienced with using dynamic building simulation programmes? If you know someone who uses TAS, TRNSYS, DYNBIL, EnergyPlus or other quality dynamic simulation programmes on a regular basis, I would like to hear from you.
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hi Kerstin,
i have a question which is somehow related to dynamic simulation as it is about weather files used in dynamic simulation. (if you think it's appropriate to move my post under a different topic please do so).
i am confronted here in East Europe with the problem of not having meteo data necessary in PHPP.
the .epw files (downloadable from the E+ site, covering a great deal of the globe), have a field called Horizontal Infrared Radiation Intensity (HIR).
i assume (not sure though) getting T_sky (needed in PHPP) from that should be pretty straightforward.
i do not know exactly the meaning of that HIR (gratedful if someone could tell me; it must some convention re meteo info in that weather file type).
is it net IR lost by a horizontal surface ?
in that case, i assume (again not sure):
HIR= surface_emmisivity* (sigma*T_surface) ^4 - sigma*(T_sky)^4
and T_sky can be obtained if T surface is taken as T_ground_surface (also available in the .epw file).
you get that for the 8760 h in a year and can find out further monthly averages.
any idea ?
all the best,
romeo
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Hi Romeo,
You can get weather files for pretty much everywhere from METEONORM. They do have an export function for PHPP as well. Check the latest PH conference proceedings for how METEONORM and PHPP work together. METEONORM also offers export to other simulation software.Free 30day trial version available.
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thank you,
i heard about Meteonorm.
i was attracted to the .epw because it's free and it's a real hourly data file.
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Yeah - problem with .epw is that you have to dress it for import in PHPP, which is hard work. Also, irradiation on tilted surfaces is not part of the data, as far as I know. It can be guessed if global horizontal and cloud patterns are known, but again - hard work to do this. What's more: for PHPP (which seems to be what you are after, even if it is not dynamic simulation) hourly data isn't needed. So, if there are measured values available for your locations of interest (not all data in Meteonorm is measured, some is interpolated) I'd definitely go with this, and let Meteonorm do the hard work. Even if you only get interpolated data, Meteonorm is probably better at guessing than anyone who's primary line of work isn't meteorology. Thus - while I usually prefer free information, and am of the opinion that free information on climate should be provided by governments as a public service - in our neo-liberal reality it's user pays, unfortunately.
Maybe you can lobby someone in your area to freely provide climate data for PHPP? Happened elsewhere, as can be seen in PHPP on the climate worksheet.
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