Design and evaluation of a thermochromic roof system for energy saving based on poly(N-isopropylacrylamide) aqueous solution

A novel thermochromic system for energy saving purpose was designed through employing aqueous solution of poly(N-isopropylacrylamide) (PNIPAM), a thermosensitive polymer. The system consisted of a glass cell filled with aqueous solution of PNIPAM. The cell bottom was covered by black fabric. At low temperature, the solution was transparent giving the cell black color that absorbed light. When the temperature was raised to above the lower …