Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of thermochromic elastomeric roof coatings for low-slope roofs
AbstractThermochromic elastomeric roof coatings for low-slope roofs were prepared by incorporating a commercial thermochromic dye (with transition temperature, Tc∼32°C) into a white acrylic elastomer matrix. Freshly applied coatings showed an initial temperature-dependent solar reflectance change of 22–25%, with a maximum solar reflectance of 70% in the colorless state (T>Tc). Weathering studies revealed that these thermochromic coatings undergo irreversible photodegradation in as little as 96h of accelerated aging. Attempts to protect thermochromic dyes with inorganic (nano-ZnO) or organic (Lowilite® 20S) UV absorbers were partially successful but need significant improvements to achieve the required lifetime of at least 10 years. Cost calculations in three different geographies showed that even if the durability of these coatings is greatly improved, the energy savings relative to the incumbent static cool roofs are small and do not currently justify the additional cost of thermochromic pigments and UV absorbers.
Evaluation of thermochromic elastomeric roof coatings for low-slope roofs
AbstractThermochromic elastomeric roof coatings for low-slope roofs were prepared by incorporating a commercial thermochromic dye (with transition temperature, Tc∼32°C) into a white acrylic elastomer matrix. Freshly applied coatings showed an initial temperature-dependent solar reflectance change of 22–25%, with a maximum solar reflectance of 70% in the colorless state (T>Tc). Weathering studies revealed that these thermochromic coatings undergo irreversible photodegradation in as little as 96h of accelerated aging. Attempts to protect thermochromic dyes with inorganic (nano-ZnO) or organic (Lowilite® 20S) UV absorbers were partially successful but need significant improvements to achieve the required lifetime of at least 10 years. Cost calculations in three different geographies showed that even if the durability of these coatings is greatly improved, the energy savings relative to the incumbent static cool roofs are small and do not currently justify the additional cost of thermochromic pigments and UV absorbers.
Evaluation of thermochromic elastomeric roof coatings for low-slope roofs
Sharma, M. (Autor:in) / Whaley, M. (Autor:in) / Chamberlain, J. (Autor:in) / Oswald, T. (Autor:in) / Schroden, R. (Autor:in) / Graham, A. (Autor:in) / Barger, M. (Autor:in) / Richey, B. (Autor:in)
Energy and Buildings ; 155 ; 459-466
12.09.2017
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
ULTRA-COOL AND THERMOCHROMIC ROOF AND SIDING COATINGS
| Europäisches Patentamt | 2024
Ultralow temperature and thermochromic roof and wallboard coatings
| Europäisches Patentamt | 2024
ULTRA-COOL AND THERMOCHROMIC ROOF AND SIDING COATINGS
| Europäisches Patentamt | 2023
ULTRA-COOL AND THERMOCHROMIC ROOF AND SIDING COATINGS
| Europäisches Patentamt | 2025