Asoluna develops, manufactures and delivers absorbers to solar collector manufacturers all over the world under the absorber trademarks Sunstrip and Lazerplate.
More than 20 years as a business partner in the solar collector industry have made the Sunstrip absorber strip one of the most common on the market, and an exclusively tried and used product.
The high performance is a result from a combination of a highly specialized surface, good fin efficiency and excellent heat transfer properties. The heat transfer properties are in turn the result of a unique construction.
The absorber strip is made of aluminium with a metallically joined copper tube. The tube’s rhombic shape allows a turbulent flow in the tube, which increases the heat transfer to the heating medium. The rhombic shape also increases the heat-transferring area.
The negligible volume of liquid in the tube reduces any dynamic loss and increases the solar collector’s energy efficiency. These qualities are especially important in large solar collectors, for which Sunstrip absorber strips have proven to be particularly suitable. The Sunstrip Protect protective layer has further improved the strip’s long-term properties.
The Swedish Testing and Research Institute (SP) has carried out a number of tests on the sputtered Sunstrip absorbers. The tests were conducted in accordance with the requirements and methods stipulated by IES Task (International Energy Agency).
The tests included checking the surface’s durability against condensation and high temperatures. The results were approved and the values correspond to a product life span of over 25 years.
Asoluna develops, produces and supplies absorbers under the Sunstrip trademark for solar collector manufacturers all over the world. The finished absorber is based on Sunstrip absorber strips, which offer an overall efficiency of the very highest class.
The absorbers can be built with both serial and parallel flow in customized sizes from 1.5 – 14 m 2 . The strip comes in different widths: 143, 122, and 70 mm, depending on the level of performance to be achieved.
A highly developed production technique and the fact that we monitor our entire production process help us maintain very short delivery times, even when making customized solutions. The absorbers are delivered pressure-tested and are ready to be installed in the solar collector.
The combination of copper and aluminium gives the absorber a low weight and high rigidity. This makes the complete absorber easier to lift and handle, compared to more common constructions found on the market. This results in smoother installation, something particularly important for large-scale absorbers.
Asoluna’s Lazerplate is a full-plate absorber engineered using laser technology which means that the selective surface is not affected.
This produces a perfectly homogenous colour tone and flat surface that comply with the stringent aesthetic demands. At the same time the joining technique provides superior performance and more possibilities to vary the design to meet the customers’ requirements.
Our method of laser welding the pipe to the plate gives several advantages. The selective surface is not affected at all because the join is made on the underside. Laser welding is done at low temperatures, which reduces the tension of material between plate and pipe. The absorber’s upper surface remains intact and free from marks.
This is a very clean production method. The joining is done without the use of filter materials or paste, which means there are no emissions of environmentally hazardous substances.
Asoluna’s Lazerplate is an absorber with superior flange efficiency (F’). This is achieved, amongst other things, by the joining technique, which provides excellent thermal contact between pipe and flange.
The Lazerplate allows greater adaptability to meet customer requirements – in the choice of plate materials as well as the selective surface. Laser welding provides optimal thermal contact no matter which plate material is chosen.
Further, the Lazerplate can be built with both serial and parallel flow and in customized lengths of 1,000 – 3,000 mm and widths of between 500 and 1,250 mm. We can also adapt the C/C distance and angle for the drain back system on the absorber pipes.