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Research Papers

Metamaterial Window Glass

[+] Author and Article Information
Alex Heltzel

PC Krause and Associates, Inc.,
3000 Kent Avenue,
West Lafayette, IN 47906
e-mail: heltzel@pcka.com

Tyler Mann

Department of Mechanical Engineering,
The University of Texas at Austin,
204 E. Dean Keeton St.,
Austin, TX 78712
e-mail: tmann216@gmail.com

John R. Howell

Fellow ASME
Department of Mechanical Engineering,
The University of Texas at Austin,
204 E. Dean Keeton St.,
Austin, TX 78712
e-mail: jhowell@mail.utexas.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 29, 2015; final manuscript received March 8, 2018; published online May 22, 2018. Editor: S. A. Sherif.

J. Thermal Sci. Eng. Appl 10(5), 051010 (May 22, 2018) (6 pages) Paper No: TSEA-15-1130; doi: 10.1115/1.4039921 History: Received April 29, 2015; Revised March 08, 2018

A computational study of a metamaterial (MTM)-on-glass composite is presented for the purpose of increasing the energy efficiency of buildings in seasonal or cold climates. A full-spectrum analysis yields the ability to predict optical and thermal transmission properties from ultraviolet through far-infrared frequencies. An opportunity to increase efficiency beyond that of commercial low-emissivity glass is identified through a MTM implementation of Ag and dielectric thin-film structures. Three-dimensional finite difference time-domain (FDTD) simulations predict selective nonlinear absorption of near-infrared energy, providing the means to capture a substantial portion of solar energy during cold periods, while retaining high visible transmission and high reflectivity in far-infrared frequencies. The effect of various configuration parameters is quantified, with prediction of the net sustainability advantage. MTM window glass technology can be realized as a modification to commercial low-emissivity windows through the application of nanomanufactured films, creating the opportunity for both new and after-market sustainable construction.

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Figures

Grahic Jump Location
Fig. 5

Reflected radiant intensity as a function of wavelength for low-e and MTM glass configurations (100 nm square dimension)

Grahic Jump Location
Fig. 4

FDTD-predicted spectra of MTM window glass in (a) winter configuration and rotated to (b) summer configuration

Grahic Jump Location
Fig. 3

Electric field distributions normal to MTM window plane (left) and parallel to nanopatterned layer (right), winter configuration (a) and summer configuration (b). Color scales in intensity normalized to incident I/I0 = |E|2/|E|02.

Grahic Jump Location
Fig. 2

Conceptual representation of a MTM window glass design

Grahic Jump Location
Fig. 1

FDTD-predicted spectra of low-emissivity window glass (10 nm Ag thin-film)

Grahic Jump Location
Fig. 6

Reflected radiant intensity as a function of wavelength for low-e and MTM glass configurations (200 nm square dimension)

Grahic Jump Location
Fig. 7

Energy capture as a function of MTM coverage of Ag base layer (constant MTM square width)

Grahic Jump Location
Fig. 8

Energy capture as a function of MTM coverage of Ag base layer (constant MTM period dimension)

Grahic Jump Location
Fig. 9

Absorption shift as a function of MTM spacing

Grahic Jump Location
Fig. 10

FDTD-predicted spectra of MTM window glass in winter configuration with incident radiation 30 deg off-normal

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