Published on November 22nd, 2010 | by Susan Kraemer


RavenSkin Nanotech Smart Walls Store the Sun’s Heat for Later

November 22nd, 2010 by  

One of my favorite science fiction ideas is in a short story called Light of Other Days about something called “slow glass.” Light took decades to pass through. In this story, the idea was that people could buy glass windows that took so long for the light to pass through, that they could nostalgically watch long gone scenes, such as their children playing outside as toddlers long after they had gone off to college, or green fields with horses where now ugly cities grew.

It was about the speed of light.

Here is a concept that is similar. Instead of slow windows, it is slow walls. RavenBrick has made a nanotech wall that can slow down the day’s heat coming into a building. Using phase-changing material at the molecular level, you get to transfer the warmth of the sun’s heat from the afternoon well into the night.

RavenBrick makes several clean tech materials for building that greatly reduce energy needs, most notably windows that turn off the sun, like Sage Electrochromics windows do. The one that is new to me is this “slow wall”. They claim that their glass-clad Smart Wall: RavenSkin could literally reduce your heating bill to zero! (Coupled with good building design, of course, you can’t expect a zero bill if you put leaky windows in their wall!)

Their wall can delay solar heat gain from hot afternoons, to later that night, when you need it more. This helps regulate the internal temperatures of buildings. It has excellent R-values to begin with (R-11 or more) so it insulates like a normal wall limiting the conduction and convection of heat.

The magic – or science fiction – part is achieved by converting incoming sunlight to infrared, and then directing the flow of energy inward only when you want it to come through the walls. The problem with super well-insulated buildings is that sometimes you do want the suns heat getting in, and regular insulated walls are dumb walls that don’t know when to send the heat in and when to shut it out.

The Smart Wall knows because you can tell it.

Susan Kraemer@Twitter

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About the Author

writes at CleanTechnica, CSP-Today and Renewable Energy World.  She has also been published at Wind Energy Update, Solar Plaza, Earthtechling PV-Insider , and GreenProphet, Ecoseed, NRDC OnEarth, MatterNetwork, Celsius, EnergyNow, and Scientific American. As a former serial entrepreneur in product design, Susan brings an innovator's perspective on inventing a carbon-constrained civilization: If necessity is the mother of invention, solving climate change is the mother of all necessities! As a lover of history and sci-fi, she enjoys chronicling the strange future we are creating in these interesting times.    Follow Susan on Twitter @dotcommodity.

  • mohammad

    miss Susan Kraemer,can help me about the PCM(phase changing materials) to store energy and use them later?
    I am studing mechanical engineering and i want to have project about PCM and store energy.
    thank you
    have good time.

    • Garnaria

      Energy has a very poor shelf life and does not store well. It is best to keep it in your refridgerator at aproximatly 38Deg.

  • Pingback: Energy and Global Warming News for November 23rd: Massachusetts clears Cape Wind for construction; Simple discoveries could enhance wind turbine efficiency by 18%; Saving energy with a ’slow wall’ |

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