The present invention relates to design and applications of a class of water-soluble small molecules represented by formula 1. The said  molecules, in their dilute aqueous solutions, exhibit lower critical solution temperature (LCST) phase transitions near room  temperature, inducing a temperature triggered switching of opacity. Further, the present invention intends to disclose a scalable smart  window prototype, akin to a radiative energy management system that can be incorporated into the built environment for imparting  energy efficiency. The prototype fabrication is facile wherein the aqueous solution is sandwiched between two transparent glass panes  to enable of light and heat transmission. While most reported smart windows are based on chromogenic technologies,  LCST Materials inducing thermally reversible change between transparent and opaque states are of contemporary interest with a  handful advantages over other chromogenic systems, such as use of a rational thermal stimulus, near-zero energy expense, uniform  switchability, ease of fabrication and scalability. The dynamic windows of present invention represent with multifarious applications  in developing scalable, smart energy management systems for indoor building environments is envisioned to be a major contribution  towards cost effective smart glass technologies.