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Switchable glazing

Which of the following switchable glazings (their characteristics change by manual control or exposure to other environmental factors) offers the fewest trade-offs for energy-efficient performance?
A. Photochromic, B. Polymer-dispersed liquid crystal film
C. Thermochromic, D. Electrochromic


Answer is D. Electrochromic glazing is a thin-film coating controlled by low-voltage electrical current and used to vary transmittance of light, UV and solar heat. B. adjusts transparency for visual privacy; C. darkens when exposed to light; A. adjusts tint according to temperature exposure. A&C control for fewer factors than D.
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