TY - JOUR
T1 - United States energy and CO2 savings potential from deployment of near-infrared electrochromic window glazings
AU - DeForest, Nicholas
AU - Shehabi, Arman
AU - O'Donnell, James
AU - Garcia, Guillermo
AU - Greenblatt, Jeffery
AU - Lee, Eleanor S.
AU - Selkowitz, Stephen
AU - Milliron, Delia J.
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - This paper presents a simulation study of the energy and CO2 benefits of a transparent, near-infrared switching electrochromic (NEC) glazing for building applications. NEC glazings are an emerging dynamic window technology that can modulate the transmission of NIR heat without affecting transmission of visible light. In this study, a hypothetical NEC glazing is simulated on clear and tinted glass in six building type models in 16 U.S. climate regions using Energy Plus 7.1. The total annual energy consumption for lighting, heating, cooling, and ventilation for the NEC glazings are compared with high performance static windows and conventional tungsten-oxide EC glazings. Using regional CO2 intensities and building stock totals, the results from individual building model simulations are scaled up to national totals. The U.S. national savings from NEC deployment is found to be 167TWh/yr (600PJ/yr) compared to the existing building stock, but only 8TWh/yr (29PJ/yr) or 1.56 million tonnes of CO2 per year when compared to high performance static glazings with lighting controls installed. NEC performance varied significantly by building type and location. This analysis reveals that 50% of the total energy savings can be realized by deploying NEC glazings in only 18% of the total window stock, and 75% of the savings in only 39% of the stock. The best performing locations include medium offices and midrise residential buildings in northern climates, where energy savings per unit window area range from 50 to 200kWh/m2-yr.
AB - This paper presents a simulation study of the energy and CO2 benefits of a transparent, near-infrared switching electrochromic (NEC) glazing for building applications. NEC glazings are an emerging dynamic window technology that can modulate the transmission of NIR heat without affecting transmission of visible light. In this study, a hypothetical NEC glazing is simulated on clear and tinted glass in six building type models in 16 U.S. climate regions using Energy Plus 7.1. The total annual energy consumption for lighting, heating, cooling, and ventilation for the NEC glazings are compared with high performance static windows and conventional tungsten-oxide EC glazings. Using regional CO2 intensities and building stock totals, the results from individual building model simulations are scaled up to national totals. The U.S. national savings from NEC deployment is found to be 167TWh/yr (600PJ/yr) compared to the existing building stock, but only 8TWh/yr (29PJ/yr) or 1.56 million tonnes of CO2 per year when compared to high performance static glazings with lighting controls installed. NEC performance varied significantly by building type and location. This analysis reveals that 50% of the total energy savings can be realized by deploying NEC glazings in only 18% of the total window stock, and 75% of the savings in only 39% of the stock. The best performing locations include medium offices and midrise residential buildings in northern climates, where energy savings per unit window area range from 50 to 200kWh/m2-yr.
KW - Dynamic windows
KW - Electrochromic glazings
KW - National energy reduction
KW - NIR-Switching
KW - Solar heat gain
UR - https://www.scopus.com/pages/publications/84924598965
U2 - 10.1016/j.buildenv.2015.02.021
DO - 10.1016/j.buildenv.2015.02.021
M3 - Article
AN - SCOPUS:84924598965
SN - 0360-1323
VL - 89
SP - 107
EP - 117
JO - Building and Environment
JF - Building and Environment
ER -
