raw · articles · ingested 2026-07-02
High-Tech Glazing With Phase-Change Material — GlassX Crystal (BuildingGreen)
confidence: medium
Source: https://www.buildinggreen.com/news-article/high-tech-glazing-phase-change-material
Source: BuildingGreen, “High-Tech Glazing With Phase-Change Material.” Credibility: Medium (authoritative trade publication with specs + pricing; single-source product data, corroborated by the Springer review).
Key points
- Maker: GlassX AG (Switzerland), licensed to Saint-Gobain; N.A. distributor Greenlite Glass Systems.
- PCM: translucent salt hydrate in sealed polycarbonate channels, melt/freeze 26–30 °C.
- Optics: direct-beam transmission up to 45% (liquid) → ~28% (crystallized); outer IGU has a suspended prismatic filter (rejects high summer sun, admits low winter sun).
- Thermal: heat storage 1,185 Wh/m² (~9 in concrete); U ≈ 0.48 W/m²·K; ~79 mm thick, 95 kg/m².
- Format: complete factory-sealed IGU modules up to 110×59 in — full-unit replacements, not frame retrofits.
- Deployment: 25+ European installs by 2010; $560–970/m², 5–10 yr payback. Cycle durability is the open question.