[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] The meaning of weather data





Design conditions are also discussed in the EnergyPlus Auxiliary Programs documentation (starting on pg 49 of the PDF, pg number 34).


 
On Wed, Dec 15, 2010 at 4:15 PM, Drury B Crawley <dbcrawley@xxxxxxxxx> wrote:
Those are design conditions as described in Chapter 14 of the ASHRAE 2009 Handbook of Fundamentals.
 
99% means that for the period of record (usually 20-30 years), the temperature is likely to be higher 99%.  (Similarly 99.6% means the temps higher 99.6% of the time.)  Combine that 99% with 'Ann Htg conds DB' and you have 8672 hours or about 128 hours of the year it will be colder. 
 
These values are used for sizing equipment (heating and cooling) automatically in EnergyPlus.


 
On Wed, Dec 15, 2010 at 1:33 PM, vicentina_0350024 <vicentina_0350024@xxxxxxxxxxxx> wrote:
 

Hi E+ Support~

When I input weather data to IDF, I could find there are several objects pop up in "SizingPeriod:DesignDay", Objects' Name: e.g. Chicago Ohare Intl Ap Ann Htg 99.6% conds DB, Chicago Ohare Intl Ap Ann Htg 99% conds DB.
What does the percentage "99.6%" and "99%" means?
Where could I get these information to understand it?

Thank you so much

Julie





__._,_.___


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.




Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___