Announcement

Collapse
No announcement yet.

Sunlight hours calculation

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Sunlight hours calculation

    Hi,

    I'm looking for a way in Revit to calculate hours of sunlight getting to a room, or at least if sun is shining on a face of a window at a given time.

    In Australia (NSW), when you do a residential project, a living room in 70% of units needs to get at least 3hours of direct sunlight each day.
    It's not illuminance values, or solar radiation, sky component, just yes/no for direct sunlight.
    Currently it's done manually with Yes/No parameter for rooms, but with larger projects it takes hours to check/populate the info in the schedule, after every design change.
    At the moment, Dynamo looks like the only option to improve and speed up the process, but I was hoping that someone here already have a solution.
    Maciej Wypych

    Bibere humanum est, ergo bibamus!

    #2
    I don't think there is a direct yes/no function within revit for that, but you can create solar studies thru the Sun Settings at the bottom. If you setup a camera and check it at different times of the year you can see if you meet that requirement. Might be impractical though if you have to do this for a lot of rooms.
    Ryan Taube
    BIM Manager - Clayco Construction | Lamar Johnson Collaborative

    Comment


      #3
      That's what we do at the moment, but it's really time consuming for larger projects.
      Maciej Wypych

      Bibere humanum est, ergo bibamus!

      Comment


        #4
        Hello Maciej,

        A great candidate for automation. But like "before and after" plan view shadow study calculations, aren't the shadows raster only? You'd need a vector outline of the shadow to perform calculations on it with Dynamo.

        What percentage of the window needs the direct sunlight for it to pass the test? 10%, 50%, 90%?

        Anthony.

        Comment


          #5
          Hi Anthony,

          Originally posted by anthonyB View Post
          A great candidate for automation. But like "before and after" plan view shadow study calculations, aren't the shadows raster only? You'd need a vector outline of the shadow to perform calculations on it with Dynamo.
          In terms of using Dynamo, you can get the sun position and direction vectors and perform a Ray Bounce, to see which objects are hit by the sun rays.
          Comparing the list of these objects with the list windows and rooms, will give me the calculation I need.
          I'm almost there with my Dynamo definition, but it will take couple more days to complete.
          I hoped that some is using some addin that does the same job.

          Originally posted by anthonyB View Post
          What percentage of the window needs the direct sunlight for it to pass the test? 10%, 50%, 90%?
          That's a bureaucratic nonsense - Residential Flat Design Code only says that it needs to be 3 hours of direct sunlight to living rooms and private open spaces. No specific requirements in terms of actual percentage of window area, illuminance values, etc..., so you can argue that if even a tiny fraction of a window receives direct sunlight it still complies.

          Are you doing any of these Sepp 65/Residential Flat Design Code calculations? how?
          Maciej Wypych

          Bibere humanum est, ergo bibamus!

          Comment


            #6
            Hi,

            Good news from Autodesk
            You can do SEPP 65 calculation with the updated Light Analysis plugin Lighting Analysis for Revit expands to include Custom Daylighting - Building Performance Analysis
            It does use cloud credits though
            Maciej Wypych

            Bibere humanum est, ergo bibamus!

            Comment


              #7
              Hi,

              Is there a way to analyze project on conceptual phase like the graphics below is showing? I need those colours showing on the mass surfaces. It should show ranges of hours of direct sunlight. For example, on the graphics below green is 3 hours and more, blue is between 1,5 to 3, and red is below 1,5 hours of direct sunlight.

              Attached Files

              Comment


                #8
                Are you familiar with Dynamo and the Ladybug package? Does wonders for things like this.
                RB Cameron, AIA, LEED AP, EDAC, NCARB
                Architect - Parametric Designer - Visualization Instructor
                Download Healthcare Revit Models
                Download Revit+3dsMax Models

                Comment


                  #9
                  Originally posted by rbcameron1 View Post
                  Are you familiar with Dynamo and the Ladybug package? Does wonders for things like this.
                  Thanks, that is the new lead for me. Does it allow to analyze surfaces of the masses or only room surfaces? I must admit I am total beginner in Dynamo.

                  Edit: I've found info that Honeybee package has this analyzis now, but don't know which script it is, since there is no description. Is it "Solar Access Recipe"?
                  Last edited by Kaducki; October 10, 2017, 09:30 AM.

                  Comment


                    #10
                    Hi, has anyone found anything new with regard to what Kaducki was asking here - to preview on a conceptual model how many hours parts of it are exposed to sun? I noticed there are some video tutorials how to do it with grashopper or ladybug, but that's still a bit tedious if you want to use it at the design stage and not just after.

                    Thanks

                    Originally posted by Kaducki View Post
                    Hi,

                    Is there a way to analyze project on conceptual phase like the graphics below is showing? I need those colours showing on the mass surfaces. It should show ranges of hours of direct sunlight. For example, on the graphics below green is 3 hours and more, blue is between 1,5 to 3, and red is below 1,5 hours of direct sunlight.

                    Comment

                    Related Topics

                    Collapse

                    Working...
                    X