EC Windows for Land Ports of Entry

GPG-023, May 2015

In sunny conditions, views through windows can be severely compromised by glare. Lawrence Berkeley National Laboratory (LBNL) conducted a pilot study of electrochromic windows at the Donna Land Port of Entry (LPOE) at the Texas border with Mexico. Researchers found a significant reduction in glare, along with high user satisfaction. Click on the infographic below to enlarge.

GPG Findings 023, May 2015, ELECTROCHROMIC WINDOWS FOR LAND PORTS OF ENTRY. Opportunity: What is the potential benefit to Land Ports of Entry? PROVIDE DIRECT LINE OF SIGHT AN UNINTERRUPTED VISUAL PATH BETWEEN THE OBSERVER AND THE AREA UNDER SURVEILLANCE. Technology: How do electrochromic (EC)windows work? TRANSITION FROM CLEAR TO DARK USING PHOTOSENSOR READINGS AND SUN PATH CALCULATIONS. Measurement and Verification. Where did M and V occur? LAWRENCE BERKELEY NATIONAL LABORATORY measured glare reduction and occupant satisfaction with electrochromic windows at the Donna Land Port of Entry along the Texas border with Mexico. Results: How did electrochromic windows perform in M&V? GLARE REDUCTION BELOW PERCEPTIBLE GLARE THRESHOLD.(Electrochromic Window Demonstration at the Donna Land Port of Entry. Eleanor S. Lee (LBNL), May 2015, p.4) NIGHTIME VISIBILITY REDUCED WITH INCREASED INTERIOR REFLECTION.100% USER PREFERENCE OVER CONVENTIONAL WINDOWS. (Ibid, p.4) Daylight Glare Probability (DGP) in Vehicle Inspection Booths Facing West Booth with EC windows has much lower glare throughout a sunny afternoon. DGP is a metric for visual comfort, with values from 0 to 1, representing the probability that a person would experience disturbing glare in a particular situation. EC Windows had a glare below .35 the level of perceptible glare. Deployment: Where does M&V recommend deploying electrochromic windows? LAND PORTS OF ENTRYAnd other facilities where window glare compromises mission-critical outdoor visibility. Subject to evaluation and approval by GSA-IT and Security [PDF - 230 KB]

Reference above to any specific commercial product, process or service does not constitute or imply its endorsement, recommendation or favoring by the United States Government or any agency thereof.

print Share Icon Last Reviewed 2017-08-13