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Title: A comparative energy analysis of three electrochromic glazing technologies in commercial and residential buildings

Abstract

Here, we present a simulation study of three dynamic electrochromic window glazings, including a novel glazing capable of independently modulating its optical properties in both the visible and near-infrared spectrums. This capability allows this so-called “dual-band” technology to actively manage the solar heat and visible light transmitted into a building's interior, and creates the potential for heating, cooling, and lighting savings vis-à-vis competing window technologies. In this study EnergyPlus is used to simulate annual energy performance of the dual-band electrochromic (DBEC) glazing in three building types and 16 U.S. climate regions. The savings potential of DBEC windows are presented relative to a conventional electrochromic glazing; a visibly transparent, near-infrared switching electrochromic glazings; and several static alternatives, including ASHRAE 90-2010 standard compliant windows. Results indicate that the DBEC glazings are capable of outperforming alternatives in a diverse set of locations and building types, including both heating and cooling-dominated regions. Relative to code-compliant static windows, the DBEC is capable of achieving annual primary energy savings between 6 and 30 kW h/ft2 of window area from reduced heating, cooling, and lighting demand. Relative to other advanced glazings, the savings are significantly lower, ranging from 0 to 1.2 kW h/ft2. Regional DBEC energy costmore » savings versus high performance static windows are presented to identify early potential market entries based on energy savings. Lastly, the impacts of widespread deployment of high-efficiency LED lighting on DBEC energy savings potentials are also presented.« less

Authors:
 [1];  [1];  [1];  [2]
+ Show Author Affiliations
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1532218
Alternate Identifier(s):
OSTI ID: 1397016
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 192; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 14 SOLAR ENERGY; Dynamic windows; Electrochromic glazings; Visible light switching; NIR switching; Energy savings; Solar heat gain

Citation Formats

DeForest, Nicholas, Shehabi, Arman, Selkowitz, Stephen, and Milliron, Delia J. A comparative energy analysis of three electrochromic glazing technologies in commercial and residential buildings. United States: N. p., 2017. Web. doi:10.1016/j.apenergy.2017.02.007.
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DeForest, Nicholas, Shehabi, Arman, Selkowitz, Stephen, & Milliron, Delia J. A comparative energy analysis of three electrochromic glazing technologies in commercial and residential buildings. United States. https://doi.org/10.1016/j.apenergy.2017.02.007
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DeForest, Nicholas, Shehabi, Arman, Selkowitz, Stephen, and Milliron, Delia J. Tue . "A comparative energy analysis of three electrochromic glazing technologies in commercial and residential buildings". United States. https://doi.org/10.1016/j.apenergy.2017.02.007. https://www.osti.gov/servlets/purl/1532218.
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@article{osti_1532218,
title = {A comparative energy analysis of three electrochromic glazing technologies in commercial and residential buildings},
author = {DeForest, Nicholas and Shehabi, Arman and Selkowitz, Stephen and Milliron, Delia J.},
abstractNote = {Here, we present a simulation study of three dynamic electrochromic window glazings, including a novel glazing capable of independently modulating its optical properties in both the visible and near-infrared spectrums. This capability allows this so-called “dual-band” technology to actively manage the solar heat and visible light transmitted into a building's interior, and creates the potential for heating, cooling, and lighting savings vis-à-vis competing window technologies. In this study EnergyPlus is used to simulate annual energy performance of the dual-band electrochromic (DBEC) glazing in three building types and 16 U.S. climate regions. The savings potential of DBEC windows are presented relative to a conventional electrochromic glazing; a visibly transparent, near-infrared switching electrochromic glazings; and several static alternatives, including ASHRAE 90-2010 standard compliant windows. Results indicate that the DBEC glazings are capable of outperforming alternatives in a diverse set of locations and building types, including both heating and cooling-dominated regions. Relative to code-compliant static windows, the DBEC is capable of achieving annual primary energy savings between 6 and 30 kW h/ft2 of window area from reduced heating, cooling, and lighting demand. Relative to other advanced glazings, the savings are significantly lower, ranging from 0 to 1.2 kW h/ft2. Regional DBEC energy cost savings versus high performance static windows are presented to identify early potential market entries based on energy savings. Lastly, the impacts of widespread deployment of high-efficiency LED lighting on DBEC energy savings potentials are also presented.},
doi = {10.1016/j.apenergy.2017.02.007},
journal = {Applied Energy},
number = C,
volume = 192,
place = {United States},
year = {Tue Feb 14 00:00:00 EST 2017},
month = {Tue Feb 14 00:00:00 EST 2017}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.apenergy.2017.02.007
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Cited by: 77 works
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Figures / Tables:

Figure 1 Figure 1: Illustration of transmittance of dynamic window insulated glass units (IGU) in each operational state. Conventional ECs transition between states 2 and 3. NIR ECs transition between states 1 and 2. Dual-band ECs are capable of transitioning between each of the above states. Rejection of UV, NIR and visiblemore » light occurs primarily through absorption and re-radiation.« less
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    Works referencing / citing this record:

    Multi-Season Assessment of Occupant Responses to Manual Shading and Dynamic Glass in a Workplace Environment
    journal, December 2019

    • Choi, Joon-Ho; Loftness, Vivian; Nou, Danny
    • Energies, Vol. 13, Issue 1
    • DOI: 10.3390/en13010060

    Chromogenic Technologies for Energy Saving
    journal, November 2020

    Comparative Performance of Semi-Transparent PV Modules and Electrochromic Windows for Improving Energy Efficiency in Buildings
    journal, June 2018

    • Martín-Chivelet, Nuria; Guillén, Cecilia; Trigo, Juan
    • Energies, Vol. 11, Issue 6
    • DOI: 10.3390/en11061526
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      Figures / Tables found in this record:

      Figure 1 (p. 33)figure
      Figure 2 (p. 33)figure
      Figure 3 (p. 34)figure
      Figure 4 (p. 35)figure
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      Figure 18 (p. 42)figure
      Figure 19 (p. 42)figure
      Table 1 (p. 43)table
      Table 2 (p. 43)table
      Table 3 (p. 43)table
      Table 4 (p. 43)table
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