[Bldg-sim] Role of Global Solar radiation in Simulation

[Larry Degelman]

Hello Aviruch,

Yes, there are models available for estimating the separate components of direct and diffuse when the horizontal global is known.  An initial question on this would be: did you do measurements of hourly values or daily?  I have a rudimentary model that I am willing to share with you that separates hourly global into direct and horizontal diffuse.  (The algorithms are written in BASIC and FORTRAN.)  Some recent work on this has also been done by the ASHRAE technical committee (TC-4.2, Climatic Information) that you can likely get access to.

On the second question, because all solar radiation will impact a building's energy consumption, it will also be a noticeable factor in the building's energy simulation results.  You should be seeing effects on both cooling and heating loads, or, if you are examining strictly passive measures, you should be seeing effects on the building's internal temperatures.

Regards,

LOD
===================================
Larry O. Degelman, P.E.   ldegelman at suddenlink.net
Professor Emeritus of Architecture
Texas A&M University
===================================


From: aviruch bhatia 
Sent: Friday, March 20, 2009 12:25 PM
To: bldg-sim at lists.onebuilding.org 
Subject: [Bldg-sim] Role of Global Solar radiation in Simulation


      Dear all,

      We are working on a project in which we measured the actual global solar horizontal radiation through out an year. Can we know the direct normal and/or diffuse horizontal radiation from the available global radiation value. 
      Upon changing the global radiation, we haven't found any effect on the energy consumption of a building which is modeled in Designbuilder and EnergyPlus using .epw weather file. Does global horizontal radiation have any affect in energy simulation, if yes, please let us know the output parameters which are affected by this variable?

      Thanks and regards
      Aviruch Bhatia
      M. Tech. (Final Year)
      Energy Engineering
      Malaviya National Institute of Technology, Jaipur 


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