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house design - calculating sun angles - house design - calculating sun angles

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  • house design - calculating sun angles - house design - calculating sun angles

    Can anyone direct me to a publication, either in hard copy or electronic, which sets out the procedure for calculating the depth of eaves to minimise summer sun, and maximise winter sun, when designing a passive solar house. I have seen a diagram and equation for doing the calculations, based on the latitude of the site, but it was several years ago, and I cannot find anything now.
    Warrnambool region, SW Victoria
    cool temperate climate, 850 mm rainfall
    0.5km inland, 100 m elevation
    2 acre clear site, rich volcanic soil

  • #2
    MF, you can download this from the Australian Institute for Energy website: http://www.aie.org.au/search_index.htm

    'Solar Angle Calculator
    Calculate the sun's position hourly for any day or month. This handy freeware utility calculates the position of the sun.
    A must for passive solar building design. For domestic dwellings, the optimum window orientation is that which allows
    maximum sun penetration in winter and minimum in summer. In general, avoid south, (in the southern hemisphere) east
    and west glass and maximise appropriately shaded north glass.

    Commercial buildings often require cooling at ambient temperatures down to 12C, solar gain should be minimised

    Download Solar_calculator.exe (for DOS) 43k

    inquiries [email:j3m96ktq]melb@aie.org.au[/email:j3m96ktq]'
    Near Byron Bay, Far North Coast of NSW, Australia

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    • #3
      Thanks Mont for the advice. I checked it out and found that the site will provide the altitude and azimuth when you key in the latitude and the month of the year. However, there is no further advice on how to calculate the width of the eaves.
      Warrnambool region, SW Victoria
      cool temperate climate, 850 mm rainfall
      0.5km inland, 100 m elevation
      2 acre clear site, rich volcanic soil

      Comment


      • #4
        That's not a bad little tool.
        Click here to download the solar calculator.
        millefleurs, not sure where you are or what hemisphere You're in (I get sick of saying this on this board).
        In the temperate southern hemisphere the cut-off point is 22 November. You don't want any sun coming in after that date.
        Use your calculator for that date and take the midday reading. The rest is simple geometry. Draw it if you're unsure.
        Jeff Nugent, SW W.Australia 34deg.S
        Mediterranean climate -
        Hot, dry summers. Cold wet winters. Rarely a frost.
        200m elevation, 75km from west and 60km from south coasts.

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        • #5
          Jeff, thanks for this additional info. I have recently acquired 2 acres of cow paddock, totally undeveloped, in the Warrnambool area, with a cool, moist climate. Proposing to draw up plans for council permits in the next 1-2 months for an energy efficient house.
          Warrnambool region, SW Victoria
          cool temperate climate, 850 mm rainfall
          0.5km inland, 100 m elevation
          2 acre clear site, rich volcanic soil

          Comment


          • #6
            Here`s a site I just found on Passive Solar design,

            http://www.srv.net/~tm_crw4d/opt/sunchrt.html

            Looked to complicated for me but hope it can be of some use to you.

            Cheers,
            Gus

            Comment


            • #7
              Here is another site which may be of use.
              http://www.squ1.com/main-page.html]Square One[/url]
              Alstonville, Northern NSW.

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              • #8
                Hey thanks alot guys. I really like the looks of that Square one site, not least because the downloads are free.

                Anyone know of a few simple formulae for doing this with pen and paper, in the event of not having a computer? (gasp!)

                Also, what are we gonna do with the Silky?
                caretaking 14 acres of ridge and gully land at Huelo, Maui. 400-500 ft above sea level
                wet tropics/subtropics

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                • #9
                  Hello MF,
                  If your looking at designing your passive solar home a good book to read is "Warm house Cool house" by Nick Hollow, its published by Choice Books, and covers passive solar designs in all climates.
                  All the best with it all Des.

                  Comment


                  • #10
                    Hey guys, this message was Posted: Wed Jan 07, 2004 12:23 am
                    I suggested this thread to help Richard on Maui in his search for the sun-movement thingywhatsit :lol: in another thread......I would say MF is already ensconced in her new house and is now busy in the gardens???

                    MF are you still around? Would love to hear how it's all going for you. You're not at Killarney are you? I was wondering if you'd built the drop dead gorgeous, bleached timber and corrugated iron "alternative looking" house there??? It would be such a coincidence . I LOVE that property and when we were looking around the area I was going to knock on the door and ask if it was for sale....way out of our price range though so I didn't want to break my heart over it.

                    Comment


                    • #11
                      Sunangles House Design

                      Millefleurs,

                      This site "www.cumberlandgroup.com.au" contains a paper titled Sustainable development, Subdivisions, Surveyors and Sun Angles.

                      This paper traces the Observations needed to work out some principles for passive solar design & your eave length.

                      The EBS Bulletin "Sunshine & Shade in Australasia" will help you out with sun angles in your area. Use the chart for Melbourne as this will be close enough. Read also Bulletin 6 "Designing Houses for the Australian Climate".

                      In Northern NSW we've used about 57° as the sun penetration angle for the northern eave. Here this gets sun penetration starting and ending on the equinox. ie March 21, September 21. and this works pretty well.

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