Electrochromic (EC) glazings perform several important functions in a building envelope, including;
- minimizing the solar energy heat gain,
- providing for passive solar energy gain,
- controlling a variable visual connection with the outside world,
- enhancing thermal comfort (controlling heat gain), energy efficiency performance, illumination, and glare control, and
- providing for architectural expression.
Therefore, it is important to understand the relative serviceability of these glazings.
This document is intended to provide a means for evaluating the durability of electrochromic glazings.
The test procedures covered in this document includes:
a) rapid but realistic cycling between high and low light transmission states;
b) environmental parameters that are typically used in weatherability tests such as simulated solar exposure and high temperature, which are realistic for the intended use of electrochromic glazings.
This document specifies the accelerated ageing test and requirements for electrochromic (EC) glazings.
The test method described in this document is only applicable to chromogenic glazings that can be switched using an electrical stimulus from high to low transmission states and vice versa. This test method is not applicable to other chromogenic glazings such as photochromic and thermochromic glazings, which do not respond to electrical stimulus.
This test method is applicable to any electrochromic glazing fabricated for vision glass (e.g. insulating glass unit, laminated glass) for use in buildings such as doors, windows, skylights and exterior wall systems and glazing exposed to solar radiation. The layers used for constructing the EC glazing and for electrochromically changing the optical properties can be inorganic or organic materials.
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