In the two pictures above we can see the same facade but in different orientations, north and south respectively. All facade envelope uses the same hexagonal panel with an hexagonal hole also, but the size for this hole is limitated by a parameter that we’ve implemented on panel design, and it depends on the incident radiation on each one for a specific location and time. Therefore, depending on the orientation of the panel with the sun position, this panel will have less or more sun radiation, and its size will be affected so the greater solar radiation, the smaller hole size.
The concept is simple to understand, but with traditional methodology, the architect did not have enough resources to design based on sun radiation, or any other parameter, in a simple way, without the BIM implementation, and the use of one of their main capabilities, the element parameterization to create smart designs.
In this practical example we want to show the process in differente steps, that we explain summarized hereafter (Vasari is the software we have used in this example):
1. SURFACE CREATION
It is a family that reproduces an extruded surface from an ellipse and is being rotated and decreasing in size as we are going up, in this way we can play with the effect that will produce the different hole sizes as panels are changing their orientation regarding the sun.
2. GEOGRAPHICAL LOCATION AND SUN SETTINGS
We chose Barcelone as location and for the panel design, we’ll take on account the summer time due to the higher sun radiation. In this way we are designing the holes to protect the interior from the higher incident radiation, and to perform the efficiency for HVAC systems in the building, for the mediterranean weather, it means a high energy input.
3. SOLAR RADIATION ANALYSIS ON SURFACE
We make an analysis on the surface, obtaining the average annual solar radiation during a day time that includes summer days. The result will be exported in .csv format, getting the analysis points on the surface together with the solar radiation values associated.
Next step consists in to design the facade and place the hexagonal panels on the surface, previously divided in an hexagonal mesh.
Dynamo software in Vasari allows with programming to extract the analysis solar radiation points and link them by proximity with panel insertion points, so we can obtain for each panel, a radiation value that we’ll use as a parameter to size each hole size.
6.ANALYSIS RESULT APPLIED ON PANELS
The process result can be seen through a gradient color applied on panels, depending on the entered solar radiation.