![]() ![]() These can all be used as a means to record the shade scene – though it isn’t a totally straightforward procedure and may be affected by lens distortions and in many cases will need to be accompanied by site measurements to ensure that the various object’s elevations and azimuths are accurately translated onto the sun-path chart. Fish eye lenses are also available for standard cameras and even for smart phones. Various camera attachments and software packages are available that allow simple recording and stitching of multiple images into a panorama. I used to have plans on how to build one of these – but have looked and frustratingly can’t find them - but if anyone has anything they can share… The solar site selector is probably one of the best known commercial products. Various other tracing tools are available – from homemade devices to commercial products. It’s a simple to use device that reflects a skyline image onto a sun-path chart which allows the user to trace the skyline. The solar pathfinder was the first solar site survey I bought – more than 10 years ago now - and I still use it. All that remains is then transferring this recording onto the standard MCS sun-path diagram. This allows the user to trace the horizon with a cross hair shown on the phone screen, with the result then recorded and displayed as a shade scene on a sun-chart. Perhaps the best known for specific solar shade recording is the iPV app. There are a number of apps on the market that enable shade panoramas to be recorded. These then need to be transferred onto the standard sun-path diagram, as shown in image 2. Once on site, the procedure is to measure the azimuth and elevation angles for each of the obstacles along your horizon. Elevation tools vary: from theodolites and laser devices, to iPhone apps and home-made devices such as the one shown in image 1. The tools required include the standard chart, a compass and some device to measure the elevation of the object in question. Probably the cheapest method to record the line will be to draw it directly from a series of measurements on site. ![]() This article is solely about the various methods that can be used to record the shade line in the first place. NOTE: This article isn’t about the process for determining the shade factor from a sun-path recording (I will cover that another day). There are a number of different ways of doing this … and this article describes a selection of them. You can set your own Latitude and Longitude in "main.m" file under ( % define location ) comment.In order to better quantify the predicted output of a proposed PV array, a requirement of the new Solar PV Guide will be to record a horizon or shade line onto a sun-path diagram. NotePad : Notepade used to see references. ![]() 7zip : 7zip used to unzip commpred files.Zenith angle: (theta sub z) the angle between vertical and the position of the sun. Solar altitude angle: the vertical angle between the horizon and the position of the sun. Solar azimuth angle: the horizontal angle between south and the position of the sun. This understanding includes knowledge of the sun and its position relative to a geographic location. Understanding the impact of natural light on architectural space is essential for architects. The importance of light in architecture can not be overstated. In the Name of Allah - the Most Compassionate, Most Merciful. ![]()
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