Heba,
It's always good to provide as much information as possible about your question, so that you get the most meaningful responses.
In this case, it appears that we've gone off talking about how to get average daily temperature profiles from the weather file, whereas from what you've explained below, the Daily variation sine wave amplitude refers to that of the indoor not the outdoor air temperature! Since heat transfer through the building foundation are delayed and dampened by the soil by days near the perimeter and by months further in, I would agree with the documentation that this term is not very important. However, if you're modeling a naturally ventilated basement, the indoor temperatures will fluctuate a great deal depending on the time of year, so it would be very important to get the average indoor temperatures (the 12 inputs before the Daily variation...) correct, and I would recommend strongly that you iterate between the Slab program (or whatever it's now called) and EnergyPlus.
This will be my last comment on this thread, not because I'm annoyed but because I've got many other things to do!
Joe
Joe Huang White Box Technologies, Inc. 346 Rheem Blvd., Suite 205A Moraga CA 94556 yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx http://weather.whiteboxtechnologies.com for simulation-ready weather data (o) (925)388-0265 (c) (510)928-2683 "building energy simulations at your fingertips"
On 4/16/2016 2:15 PM,
hassan_kamel77@xxxxxxxxxxx [EnergyPlus_Support] wrote:
Dear all,
Thank you very much for this great help,Actually, I need this No. for the input of the (GroundHeatTransfer:Basement:SurfaceProps) Object. in the Basement Preprocessor of the EnergyPlus.
The example default No. is: 0.0Although the program advice is: (this No. is not important).But, I am working on a harsh climate desert city, with a naturally ventilated basement model calibration.So, I need to be site-specific and more local as much as possible.
Therefore, I need one No. value of the daily variation sine wave amplitude.
Again, thanks very much for your great help,Heba
__._,_.___
Posted by: Joe Huang <yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx>
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.
__,_._,___