Solar position
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

Solar Position PowerPoint PPT Presentation


  • 60 Views
  • Uploaded on
  • Presentation posted in: General

Solar Position. Sun’s movement through the day/year is a critical environmental factor that needs to be understood to design a high performance building Planned correctly, you can take advantage of the sun’s path Natural daylighting Passive heating Photovoltaic energy generation

Download Presentation

Solar Position

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Solar position

Solar Position


Solar position

  • Sun’s movement through the day/year is a critical environmental factor that needs to be understood to design a high performance building

  • Planned correctly, you can take advantage of the sun’s path

    • Natural daylighting

    • Passive heating

    • Photovoltaic energy generation

    • Natural ventilation


Solar position1

Altitude – vertical angle the sun makes with the ground plane

Azimuth – horizontal angle between the

sun and true north (-180 degrees,

180 degrees, positive in a clockwise

direction from north)

Solar Position


Seasonal variations important dates

  • Sun’s path varies throughout the year

  • Summer – sun is high and rises/sets north of east-west (northern hemisphere)

    • south of east-west (southern hemisphere)

    • Rises much earlier and sets much later in the summer than the winter

  • To plan for the extreme heat in the summer study the summer solstice

    • Sun is at its highest noon altitude

Seasonal Variations/Important Dates


Seasonal variations important dates1

Winter sun is low in the sky

Rises/sets south of east-west (northern hemisphere)

Rises/sets north of east-west (southern hemisphere)

To study extremes of winter look at the sun’s path during winter solstice, sun is at its lowest noon altitude

Seasonal Variations/Important Dates


Seasonal variations important dates2

To study more average positions look at the sun’s path on the spring and autumn equinoxes, sun rises and sets due east-west

Altitude of the noon sun at the equinox is determined by the latitude of the site

Rule of thumb for optimum angle of solar panels is the latitude of the site, rays are most perpendicular to the panel for most of the year

Seasonal Variations/Important Dates


Tips rules of thumb

  • Study particular days

    • Solstices: extreme of the sun’s position

    • Equinoxes: average sun position

  • Study different seasons:

    • Winter studies – How to maximize sun to passively heat the building

    • Summer studies – How to minimize sun to passively cool the building

Tips/Rules of Thumb


Dates to remember

Dates to Remember


Look at some specific times of day

Morning – try to capture the sun’s energy to warm up spaces when the sun is low in the sky, need to protect against glare

Noon – Strongest and highest in the sky. Avoid hot midday sun to reduce cooling loads. May want to capture the sun for passive solar heating/energy generation

Afternoon – Prevent overheating/glare

Occupancy hours – Think about when the building is used most

Look at some specific times of day


Stereographic sun path diagrams

Used to read solar azimuth and altitude throughout the day

Like a photograph of the sky, looking straight up towards the zenith with a 180 fish-eye lens

Paths of the sun at different times of the year can be projected onto this flattened hemisphere

Stereographic Sun Path Diagrams


How to read stereographic sun path diagrams

Used to read solar azimuth and altitude

Azimuth lines- angle lines run around the edge of the diagram

Altitude lines – represented as concentric circular dotted lines that run from the center out

Date lines – Start on the eastern side of the graph and run to the west. Represent the path of the sun on one particular day of the year

Hour lines/analemma – shown as figure 8 lines that intersect the date lines and represent the position of the sun at a specific hour. Intersection between date and hour gives the suns position

How to read stereographic sun path diagrams


Reading the sun position

Locate the required hour line on the diagram

Locate the required date line (solid lines are Jan-June and dotted July-Dec

Find the intersection point of hour and date lines (solid with solid, dotted with dotted)

Draw a line from the very center of the diagram through the intersection point to the perimeter

Read the azimuth angle take clockwise from the north

Trace a concentric circle around from the intersection point to the vertical north axis, displays altitude angle

Interpolate between concentric circle lines to find altitude

Gives suns position as defined by azimuth and altitude

Reading the Sun Position


  • Login