The Diversity solar concentrator is a device operating on the principle of Fresnel lens collecting radiation from some region of space into 10 cm long focal spot.
The geometric shape, which allows you to collect parallel rays in two-dimensional space is a parabola, and in three-dimensional space is paraboloid of revolution, respectively. However, paraboloid (volume ovoid bowl with the settings) is difficult to simulate in conventional home conditions, so we tried to solve the problem easier. We get the model Fresnel lens as basis, but inverted it and covered the surface of sunlight-reflecting material . To simplify the task we replaced the segments truncated paraboloid on segments truncated cones with the same length of generatrixes. Focus of concentrator converges in some straight line equal to the length of generatrixes truncated cones. Thus, solar concentrator consists of concentric mirror segments truncated cones, attached to the upper face of the base plane.
Solar concentrator can be used for a variety of applications from getting boiling hot water for your morning coffe to using the concentated solar power for heating or electricity generation. In most common cases household-grade concentators are used for cooking food and boiling water.
One of the most promising applications of solar concentrator is using it in combination with electricity-generation devices - high-efficiency solar cells or Stirling engine or steam engine in combination with a generator. EnergyTorrrent team is working on both Stirling engine and steam engine components which coud be used along with solar concentrator to generate electrcity.
|#||Title||Un. of meas.||Quantity|
|1||OSB-3 15 mm х 1,25 m х 2,5 m||thing||1|
|2||Armed tape 25 m||thing||1|
|3||Washer increased М8||thing||12|
|4||Screw with washer||thing||4|
|5||Nut DIN 934 М8||thing||20|
|6||Spring washer М8||thing||10|
|7||Butterfly nut DIN 315||thing||16|
|8||Metal thread 50 m||thing||1|
|9||Steel Track UD27||thing||4|
|10||Metal Roofing 0,4 mm 1,25 m х 2,0 m||sheet||1|
|11||Steel Track CW75 – 3 m||thing||4|
|12||Steel Track CW75 0,55 mm – 3 m||thing||4|
|13||Corner equilateral 90х90х60х2||thing||4|
Modeling of concentrator was performed in the software environment Rhinoceros:
ATTENTION! If you move the markup directly on the roofing sheet metal material pay attention and remember about admission to connect sectors adding 10 mm from one side of the sector!
Table. Options for making reflection elements
|# Ring||External diameter, mm||Internal diameter, mm||Removed angle of sector, °|
The items are made from the roof sheet. In the experimental model used roof sheet with thickness of 0.4 mm. Picked element is the frustum. The blank of the element is truncated cone.
In the absence of the roof sheet required size of the frustum you can divide segment into sectors with adding 10 mm to connect the lasts by rivets or screws with overlap.
The support elements should be placed along the radii of large ring platform with sliding the next one adjacent element by angle of 45°. The support elements are attached to the large and small ring by screws on the back of the rings so that the screws gone inside to the end of the reference element.
The reflection elements and platform are connected by screws with washers for better fixation. Originally established smallest element. Screws are twisted in the rib of support element.
Also reflection elements can be fastened to the platform with epoxy glue.
This section is under development (:
Roman Pomazan, Stanislav Dzherikhov, Olexandr Taran, Bogdan Kolomiets, Denys Myroniuk
This model has developed by the Diversity team during the first solar hackathon “SunnyDay” in Ukraine (June 21-23 2014).