Phase-change material in 1948: Telkes Dover house
The behaviour of Phase-change material is written as 1948’s “Telkes Dover house,” fixed by 21. An advert’s adjective is not a melting point. “Room temperature” alone is not a figure. Scores compare Phase-change material with the rest of the atlas on strength, heat, fire behaviour, insulation, workability and circularity. They are editorial, not certificates.
Phase-change material is sold as grades, not as a single substance. Chemistry paraffins / salt hydrates / bio-waxes, density ~0.8–1.6 g/cm³, heat band designed 18–28 °C for buildings. This atlas treats Phase-change material as a system: mill route, coatings, tests and the cavity it sits in.
Conductivity note: low-to-moderate; often needs fins or graphite. Insulation score 52/100 is relative to 32 entries — metals lose, VIPs and aerogels win. Fire letter in editorial use: paraffin = combustible; salts vary. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.
Origin: NASA / Telkes 1940s–70s; building PCM 2000s, United States / Germany. The process chapter follows feedstock → conversion → forming → finish → install. Uses span buildings to defence / safety. Pairings matter: mineral-wool. Circularity mark 48/100. Ask which scrap, which certificate, which year.
“Telkes Dover house” for Phase-change material in 1948 carries 21. Praise without that figure is not a property.1948
Figures to keep
- Year of the condition
- 1948
- Property figure
- 21
- Material
- Phase-change material
- Use line
- Telkes Dover house
Polyester in 1929: Carothers estersNext essayAll 1000 essays1000