Paper Title
Smart Windows - Challenges and Opportunities

Abstract
Smart windows denote a class of windows being able to dynamically change, either adaptively or controllable, the transmittance of solar radiation upon an external stimulus such as voltage, temperature, solar radiation, gas or any other means. The utilization of smart windows may represent an important part of the energy-efficient buildings of tomorrow. The miscellaneous smart window technologies have different properties and modes of operation. Thus, from both a fundamental/technological viewpoint and maturation level, including commercialization state, it may be difficult to know which smart window technologies to select for their intended applications. Within the realm of smart window technologies we find adaptive technologies like thermochromic and photochromic windows, and controllable technologies as electrochromic, gasochromic, photovoltachromic, liquid crystal, polymer-dispersed liquid crystal, suspended particle and reversible metal electrodeposition windows. In this study the various challenges and opportunities with the different smart window technologies will be explored and discussed. A few examples of experimental laboratory investigations conducted on research and commercial smart windowswill be presented. Keywords - Smart window, Electrochromic, Solar radiation, Transmittance, Reflectance, Absorbance .