PerspectiveOptical Metamaterials

Metamaterials for perpetual cooling at large scales

+ See all authors and affiliations

Science  10 Mar 2017:
Vol. 355, Issue 6329, pp. 1023-1024
DOI: 10.1126/science.aam8566

eLetters is an online forum for ongoing peer review. Submission of eLetters are open to all. eLetters are not edited, proofread, or indexed.  Please read our Terms of Service before submitting your own eLetter.

Compose eLetter

Plain text

  • Plain text
    No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Author Information
First or given name, e.g. 'Peter'.
Your last, or family, name, e.g. 'MacMoody'.
Your email address, e.g. higgs-boson@gmail.com
Your role and/or occupation, e.g. 'Orthopedic Surgeon'.
Your organization or institution (if applicable), e.g. 'Royal Free Hospital'.
Statement of Competing Interests
CAPTCHA

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Image CAPTCHA
Enter the characters shown in the image.

Vertical Tabs

  • Cooling power can be much improved
    • Yoshiyasu Takefuji, Professor, Keio University
    • Other Contributors:
      • Takashi Sasaki, CEO, Niigata-Techno

    During the solar radiation peak, Fig.4C shows that cooling power of the proposed method (1) dramatically decreases. It is because the volume of the hybrid metamaterial is not sufficient. Fig.S2A in the supplementary material indicates that the maximum refractive index is about 22 degree (arctangent(80cm/2/100cm)=21.8). Because of 90/21.8=4.1, overlaying five films should make less likely to become hot. Because of 22-(22*5-90)=2 degree, the near-perfect reflection can be achieved.

    References:
    1. Yao Zhai, et al., Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling, Science 355, 1062–1066 (2017)

    Competing Interests: None declared.
  • pico or peta?

    Is there a typo in the introduction: picowatts (pW) or petawatts (PW)?

    The last time I checked, there was a whole atmosphere between us and outer space ('the cold universe'), so is it right to say this is where the dumped heat is going?

    Competing Interests: None declared.