Northeastern University researchers have developed a new “paper” that, when applied to roofs, can dramatically reduce cooling loads. The paper is made of hydroxyapatite materials spun into fibers and made into a paper. Its white color reflects the majority of the direct rays from the sun. In addition, heat from inside the structure is radiated to the sky (and into space) at frequencies that the atmosphere (greenhouse gases water vapor, and CO2) doesn’t readily absorb. This means the paper provides cooling during the day and at night.
The paper is expected to have a life of about 15 years. It is hydrophilic, so it will repel water and stays white longer than most other types of white roofs. It also won’t absorb water vapor in humid climates. The researchers believe it can reduce roof temperatures by 10°F in the summer and eliminate 100 millions tons of carbon emissions from HVAC equipment when widely implemented. They are hoping to commercialize the product soon, after a little more testing on structures in Boston, and perhaps Phoenix and Texas where it is hotter and more humid than Boston. – Steve Terry, DTC HVAC & Refrigeration Instructor
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