MODUL P4 FISIKA BANGUNAN BETA

SOLAR CHART

A. TujuanAdapun tujuan diadakannya paraktikum ini adalah sebagai berikut:1. Mahasiswa mampu memetakan pola lintasan matahari (Sun Path/ Sun Position) di

langit menggunakan simulasi software Ecotect dan menentukan nilai maksimum pencahayaan alami (jam, hari, dan bulan) pada suatu lokasi.

2. Mahasiswa mampu membuat, membaca, dan menganalisa Solar Chart jenis Stereographic simulasi Ecotect.

3. Mahasiswa mampu menentukan letak sumber pencahayaan alami (jendela/arah jendela) yang tepat bagi suatu bangunan di daerah tersebut (bergantung pada lamanya Periode Fasad Tersinari Matahari).

Software Ecotect dapat didownload pada link berikut: http://bit.ly/1QiccCL

B. Dasar TeoriCara Membaca Diagram Lintasan Matahari sumber: http://bit.ly/1Qi93CH

Reading Sun Path DiagramsSun path diagrams can tell you a lot about how the sun will impact your site

and building throughout the year. Stereographic sun path diagrams can be used to read the solar azimuth and altitude for a given location.

Gambar .gif: http://bit.ly/26b3cee

Stereographic Sun Path DiagramsStereographic sun path diagrams are used to read the solar azimuth and altitude throughout the day and year for a given position on the earth. They can be likened to a photograph of the sky, taken looking straight up towards the zenith, with a 180° fish-eye lens. The paths of the sun at different times of the year can then be projected onto this flattened hemisphere for any location on Earth. 

Note that these stereographic diagrams are not exactly like a fish-eye photo: such an image would be flipped left-to-right.  These diagrams are from the point of view of the sky looking down at the ground, you can superimpose it on a map or a plan of the building without being confused. (You can see this by following the hour lines from east to west on the diagram.)

Azimuth Lines - Azimuth angles run around the edge of the diagram.

Altitude Lines - Altitude angles are represented as concentric circular dotted lines that run from the center of the diagram out.

Date Lines - Date lines start on the eastern side of the graph and run to the western side and represent the path of the sun on one particular day of the year. In Ecotect, the first day of January to June are shown as solid lines, while July to December are shown as dotted lines.

Hour Lines/ Analemma - Hour lines are shown as figure-eight-type lines that intersect the date lines and represent the position of the sun at a specific hour of the day. The intersection points between date and hour lines give the position of the sun. 

Reading the Sun Position (Step-by-Step)1. Locate the required hour line on the diagram. 2. Locate the required date line, remembering that solid are used for Jan-

June and dotted lines for July-Dec. 3. Find the intersection point of the hour and date lines. Remember to

intersect solid with solid and dotted with dotted lines. 4. Draw a line from the very center of the diagram, through the intersection

point, out to the perimeter of the diagram. 5. Read the azimuth as an angle taken clockwise from north. In this case, the

value is about 62°. 6. Trace a concentric circle around from the intersection point to the vertical

north axis, on which is displayed the altitude angles. 7. Interpolate between the concentric circle lines to find the altitude. In this

case the intersection point sits exactly on the 30° line. 8. This gives the position of the sun, fully defined as an azimuth and altitude.

Annotated stereographic sun path diagram.

Referensi Video Cara Analisis Sun Path pada Software Ecotect:

How to use the Sun Path featurehttp://bit.ly/26b3Bxe

Visualizing sun path and shadows in Autodesk Ecotecthttp://bit.ly/1qCaXZR

Calculating sun path and shadows in Autodesk Ecotecthttp://bit.ly/1SnGwAg

C. Metodologi Percobaan1) Alat Percobaan

Google Maps Ecotect software Buku Referensi Fisika Bangunan (Bab Solar Chart)

2) Prosedur Menentukan koordinat lokasi yang akan dianalisa pencahayaan mataharinya

menggunakan Google Maps.

Membuat desain suatu bangunan sederhana yang diasumsikan berada pada lokasi tersebut (misal rumah, kelas, sekolah, kantor, dll.) menggunakan software Ecotect.

Memasukkan parameter koordinat pada software Ecotect, lalu menjalankan simulasi lintasan matahari (Sun Path/Sun Position) pada software.

Buatlah sebuah output Solar Chart dari software Ecotect tersebut dan tentukan kapan (jam, hari, dan bulan) pencahayaan alami di lokasi tersebut mencapai nilai maksimum. Cobalah untuk membaca dan memahami Solar Chart yang diperoleh.

Analisa hasil simulasi dan kaitkan dengan pencahayaan alami suatu ruangan (misal letak jendela atau arah jendela) berdasarkan lamanya Periode Fasad Tersinari Matahari.

Susunlah sebuah laporan praktikum secara individu yang membahas kedua hasil simulasi dan buatlah file Power Point untuk satu kelompok.

Adakan presentasi kecil-kecilan mengenai hasil simulasi dan analisis kalian di depan asisten Fisika Bangunan.