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MoM presentation_thursday_the 2 degrees challenge -materials for resiliency

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Thursday lesson,MoM Matters of Matter Summer School.
Focusing on materials for resiliency : coool roofs, solarcontrol thin films, and the tools used to study them: IR Thermometers and thermal camera

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MoM presentation_thursday_the 2 degrees challenge -materials for resiliency

  1. 1. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency The 2°C - Challenge Coping with Rising Temperatures: Materials for Resiliency This project has received funding from the European Union's Erasmus + Programme for Education under KA2 grant 2014-1-IT02-KA201-003604. The European Commission support for the production of these didactical materials does not constitute an endorsement of the contents which reflects the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein. All MoM materials, this document included, belong to MoM-Matters of Matter authors and are distributed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License as OER Open Educational Resources . Funded by EU under the Erasmus+ KA2 grant N° 2014-1-IT02-KA201-003604_1.
  2. 2. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Temperature Anomalies.mp4 https://ec.europa.eu/jrc/en/news/super-heatwaves-55-c-emerge-if-global-warming-continues It’s here! …how do we cope with it?
  3. 3. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 The basics: are you sure you know how to use it? Conduction, convection, radiation Thermal equilibrium Emissivity Changing resistance Emissivity!!! radiation convection conduction Ti Te Ti >Te T H E R M O M E T E R S
  4. 4. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 Radiative heat • Stopped by vacuum • Each body emits IR according to its temperature (blackbody radiation) • Emittance depends on colour, geometry, textureLESLIE CUBE
  5. 5. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 Reflection, Absorption, Emission & colours Sheets of paper working better on open boxes as roof
  6. 6. www.mattersofmatter.eu The 2°C Challenge: Materials for ResiliencyLeslie’s Cube What about • Colour • Texture • Metals & low emissivity surfaces What about • Angle • Distance Filled with hot water
  7. 7. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 Home made Leslie’s Cube Inside VS outside painting…
  8. 8. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Cool Roofs
  9. 9. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Hurban Heat Island and Cool Roofs Source: https://commons.wikimedia.org/wiki/File:Urban_heat_island_(Celsius).png - Public Domain Licence Cool roof Traditional roof • Reflectance high low • Emissivity high low
  10. 10. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Arduino & Cool Rooves Take a number of differently coloured cardboard shhets (possibly of the same kind: either all shiny or all opaque) Expose them to the sun or under an halogen/IR lamp. Which colours do you think will have the maximum reflectance? Compare your hypothesis with experimental data. Test also with a mirror, an aluminium sheet and a black cardboard sheet. Colore Radiazione incidente-RI Radia zione rifless a- RR Riflettanza RI/RR Emittanza E- IR Does the reflectance of a specific surface change along the day? And what about seasons? See also MoM_Monday_Arduino in the Physics_Lab LDR
  11. 11. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Cool roofs, cool pavements,…. cool cars! cool Coolpaints have a higher reflectance in the IR therefore their surface feel hotter outside This is confirmed by the thermal camera. However inside the building is cooler IR CONTACTLESS Thermistor
  12. 12. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 With Arduino: heating and cooling curves over the day a) INDOOR and b)outdoor just next to the roof surface
  13. 13. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 • Eco efficient sustaineable houses • Acts as a radiant barrier and blocks unwanted heat gain in warm months (southern countries) heat loss the cold winter months (northern countries) Download Nanoceramix technical Manual at http://www.nanoceramix.com/docs/NanoceramiX%20PicoceramiX%20Nanotermica %20-%20Brochure%202015.pdf Beautiful SEM images of the nanospheres +clearly illustrated properties Most insulators work by trapping air inside but once air «saturates» heat is transferred to the adiacent walls • In summer traditional insulation may be an issue-> heat is redirected only late at night • BUT radiation IS NOT stopped by air!!!
  14. 14. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 • Cool black paint is now tested in Automotive - «Black is posh!» -10°C See activity “FCh2_Cool_Roofs” • Temperatures recorded in August, Texas USA.Outdoor Temp 32 °C Materials exposed for 6 hours There’s more than 10°C difference between Nanoceramix (blue) and common white paint (red).
  15. 15. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Indoor –afternoon -30°C At hambient temperature BEFORE exposition to the sun Aluminium sheets 1 mm thick with one side painted (one is cool roof paint!) The thermal camera is shooting perpendicular to the plate surface from 50 cm approx. Left sheet A, Right sheet B Indoor IMMEDIATELY AFTER the exposition to the sun.The room was totally darkened Outdoor –exposition to the sun, first the plates on the terrace tiles and then on cardboard boxes 30,4°C 42,6 40,1 15:38 15:43- 5’ 1 2 3 43,6
  16. 16. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 Winter: test with two metal sheets painted with normal white and «cool» white. Use halogen lamps or IR lamps Summer: testing outside BEST option for southern latitudes
  17. 17. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 2 3 4 Testing different white paints
  18. 18. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Window films for solar control
  19. 19. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency 1 The case During the winter, our school suffers the strong influence of sunlight on the windows, especially in the two wings of the building facing South. In the morning there is a rise in temperature inside the classrooms which urges students to open the windows causing a huge dispersion of the heat generated by radiators and therefore a waste of energy that persists each year for about 5 / 6 months. Students first thought of building a water bottles wall, then due to the excessive weight opted for window thin film… From water bottles wall to thin film From heat storage to radiant barrier PCM In blue without thin film
  20. 20. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency With glass films Window films for solar control a b s o r b e d 89% 6% 5% Re-radiated outward Re-radiated inward Transmitted Reflected Common glass a b s o r b e d 22% 43% 35% Re-radiated outward Re-radiated inward Transmitted Reflected 25% 10% 32% Total solar energy admitted inside 68% Total solar energy rejected back 11% Total solar energy rejected back 89% Total solar energy admitted inside
  21. 21. www.mattersofmatter.eu The 2°C Challenge: Materials for Resiliency Testing solar radiation control with windows thin films

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