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RE: [EnergyPlus_Support] WMO Station 107290




Dear Jean,



In my opinion:

·         there?s a definition of how climate zone is determined in ASHRAE 90.1 Section 5.1 and Appendix B (It is the governing standard so it is my first preference for data.)

·         The definition in Appendix B identifies criteria for determining the zone number from CDD or HDD (Table B-4) and whether you are ?dry? or ?humid? using a formulae which consider several criteria including precipitation.

·         For consistency, HDD or CCD should be calculated from your specific TMY data (keeping in mind that CDD uses a 50F base and HDD 65F) instead of a separate source (which may use a different raw data set)

·         Moisture zone should be calculated similarly (assuming you can get precipitation data from a reliable source)




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