Aging behavior of polymeric solar absorber materials – Part 1: Engineering plastics

Kahlen, Susanne; Wallner, Gernot M.; Lang, Reinhold W.

doi:10.1016/j.solener.2010.03.021

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…The low pressure in the solar collector loop is indeed a strong advantage for the durability of polymer materials (Kahlen et al, 2010;Kaiser et al, 2013b). EPDM collectors have been tested in combination with the DB concept for a long time (Perers, 1988;Bertram et al, 2006).…”

Section: Collectorsmentioning

confidence: 99%

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Drainback solar thermal systems: A review

et al. 2016

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Although solar drainback systems have been used for a long time, they are still generating questions regarding smooth functioning. This paper summarizes publications on drainback systems and compiles the current knowledge, experiences, and ideas on the technology. The collective research exhibits a lack of scientific publications dedicated to the drainback technology, however a significant number of patents have been published, detailing innovative technical solutions towards improvements and reliability. Based on the evaluation of drainback hydraulics, a detailed classification of this technology has been developed, with a brief description of each hydraulic typology. The operating modes have been split into three stages: filling, operation, and draining, which have been studied separately. A difference in the minimal filling velocities for a siphon development in the solar loop has been discovered in various reports. Specific features of the operation mode have been described. For the draining, existing mechanisms to initiate the emptying process have been identified and categorised. Finally, stateof-the-art hydraulic components for drainback systems have been established, with emphasis on their requirements. Based on those findings, the authors suggest potential future research paths in order to fill the knowledge gap and disseminate the drainback technology.

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Section: Collectorsmentioning

confidence: 99%

“…EPDM collectors have been tested in combination with the DB concept for a long time (Perers, 1988;Bertram et al, 2006). More recently, so-called engineering or high performance polymers have also been proposed (Kahlen et al, 2010;Rekstad, 2012).…”

Section: Collectorsmentioning

confidence: 99%

Drainback solar thermal systems: A review

et al. 2016

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“…While plastics are also being evaluated as solar thermal absorbers, 61 it is the photovoltaic (P-V) applications that are of greater commercial interest. 62,63 Research emphasis appears to be divided between the solar UV-damage to light-harvesting semiconductor polymers in organic P-V devices 47,64,65 and that of plastic encapsulants used to protect silicon P-V modules.…”

Section: Plastics In Solar Photovoltaic Applicationsmentioning

confidence: 99%

Consequences of stratospheric ozone depletion and climate change on the use of materials

Andrady

Torikai²,

Redhwi

et al. 2014

Photochem Photobiol Sci

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Materials used in the exterior of buildings and in construction are routinely exposed to solar UV radiation. Especially in the case of wood and plastic building materials, the service life is determined by their weather-induced deterioration. Any further increase in ground-level solar UV radiation, UV-B radiation in particular, will therefore reduce the outdoor service life of these products. Any increase in ambient temperature due to climate change will also have the same effect. However, the existing light-stabilizer technologies are likely to be able to mitigate the additional damaging effects due to increased solar UV radiation and maintain the outdoor lifetimes of these materials at the present levels. These mitigation choices invariably increase the lifetime cost of these products. A reliable estimate of what this additional cost might be for different products is not available at the present time. Personal exposure to UV radiation is reduced both by clothing fabrics and glass windows used in buildings and automobiles. This assessment describes how the recent technical advances in degradation and stabilization techniques impact the lifetimes of plastics and wood products routinely exposed to solar UV radiation and the protection to humans offered by materials against solar UV radiation.

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“…Aging of polymeric materials which are potential candidates for applications in solar absorbers has been the subject of several studies, in terms of the effect of physical, chemical, and mechanical aging. [5][6][7] In a recent report, the aging behavior of several amorphous and semicrystalline polymers was studied under conditions of exposure to hot water (80°C, up to 16,000 h) and hot air (140°C, up to 500 h), relating the changes observed in the mechanical properties under tension, where the main aging mechanisms observed were physical and chemical. [6] Studies dealing with the effects of irradiation on polymers have been an important area of research; irradiation on polymers can modify their structure and properties due to molecular chain rupture, which can be reflected, in some cases, through a change in color and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] In a recent report, the aging behavior of several amorphous and semicrystalline polymers was studied under conditions of exposure to hot water (80°C, up to 16,000 h) and hot air (140°C, up to 500 h), relating the changes observed in the mechanical properties under tension, where the main aging mechanisms observed were physical and chemical. [6] Studies dealing with the effects of irradiation on polymers have been an important area of research; irradiation on polymers can modify their structure and properties due to molecular chain rupture, which can be reflected, in some cases, through a change in color and mechanical properties. [8] Polycarbonate (PC) is a widely used polymer in the field of science and technology, particularly in optics, medicine, and roof domes due to its low cost, easy processing, and light weight; PC has excellent physical and chemical properties, good transparency, high mechanical resistance, and good thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Aging effect in the adhesion of a PC/CPVC arrangement for application in thermo-solar collectors

Carrillo

Garcia

Gamboa

et al. 2014

Journal of Adhesion Science and Technology

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This work studies the aging of materials in a polycarbonate/chlorinated polyvinyl chloride (PC/CPVC) arrangement, used in a flat plate thermo-solar collector. Typically, PC is used as an absorbing surface and CPVC in entrance and exit heads of the flow, which in this case is water. In this study, two types of methacrylate adhesives were used to bond both plastics, denominated MP and SK. The experiment comprised a study of adhesion behavior between these polymers and the adhesives, in contact with distilled water at different temperatures and different time intervals, simulating the corresponding operating conditions of a thermo-solar collector. Results showed that the SK adhesive did not fail under these conditions, while the MP adhesive underwent evident aging and adhesive failure. In addition, the PC presented a reduction in its mechanical strength when it was subjected to higher temperatures and periods of hygrothermal exposure, probably due to physicochemical deterioration caused by hydrolysis.

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Aging behavior of polymeric solar absorber materials – Part 1: Engineering plastics

Cited by 28 publications

References 17 publications

Drainback solar thermal systems: A review

Drainback solar thermal systems: A review

Consequences of stratospheric ozone depletion and climate change on the use of materials

Aging effect in the adhesion of a PC/CPVC arrangement for application in thermo-solar collectors

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