The beam solar on the weather files is direct normal, i.e., the amount staring straight at the sun (but don't keep your eyes there for too long :-)). The solar radiation received on a horizontal roof would be reduced by the sine of the solar altitude. An easy way to get the direct horizontal would be simply to subtract the diffuse horizontal from the global (total) horizontal on the weather file. I haven't looked at your files. Let me know if I'm wrong :-0
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 5/27/2015 3:03 PM, o.hans@xxxxxxxx
[EnergyPlus_Support] wrote:
Hello all,
I have modeled a simple cube to simulate the incident solar radiation for different oriented surfaces on a specific day. The Incident Beam Solar Radiation on the horizontally flat roof should be identical to the Direct Solar Radiation from the weather file. Unfortunately it isn't although there is no overshadowing or reflective surface. The diffuse radiation results however match.
Could someone maybe explain what I am missing. I have attached the model, weather file and results for scrutiny.
Thanks in advance for any advice,
Oliver
__._,_.___
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.
__,_._,___