Composite window framework fabricated using recycled styrene foam panels

A composite window framework, comprising:

• a window frame (30) fitted in a window opening formed on a wall of a building, said window frame (30) consisting of an aluminum outside panel (45) and an insulation inside panel (35) produced using recycled styrene foam through an extrusion process, said insulation inside panel (35) of the window frame (30) having a longitudinal fitting groove (36) or (37) on each of two neighboring surfaces thereof, and said aluminum outside panel (45) being provided with a longitudinally channeled fitting rail (46) having an open-cornered rectangular cross-section designed to closely engage with the two fitting grooves (36) and (37) of the inside panel (35) at its opposite flanges while covering an angled surface of the inside panel (35) between the two fitting grooves (36) and (37);
• and
• a movable sash (12) set within said window frame (30) and containing a pane of glass to form a window (10) or (10′), said movable sash (12) consisting of an aluminum outside panel (25) and an insulation inside panel (15) produced using recycled styrene foam through an extrusion process, said insulation inside panel (15) of the movable sash (12) having two longitudinally and parallely formed fitting grooves (16) and (17) on its inside surface, and said aluminum outside panel (25) being provided with a longitudinally channeled fitting rail (26) having a ␣-shaped cross-section, and closely engaging with the two fitting grooves (16) and (17) of the inside panel (15) at its opposite flanges while covering the inside surface of the inside panel (15) between the two fitting grooves (16) and (17).