ColdLam

ColdLam is a hypothetical concept in the field of passive cooling and photonic materials. It refers to laminated structures designed to reduce thermal load by radiating heat away while minimizing solar heat gain.

In proposed designs, ColdLam uses alternating layers that tailor spectral properties: high infrared emissivity in the 8–13 micrometer atmospheric window, combined with low solar absorptivity in the visible and near-infrared. Some concepts include luminescent or upconversion layers that re-emit absorbed energy at longer wavelengths, extending radiative loss.

Applications include building envelope components for daytime cooling, cooling for electronic systems, and integration into skylights or glazing. Potential benefits include lower air-conditioning demand and improved efficiency of outdoor equipment.

As a hypothetical concept, ColdLam remains experimental with limited public demonstrations. Key challenges include materials stability, weathering, manufacturability, cost, and the need to verify long-term performance under varying sun angles and environmental conditions.

See also radiative cooling, photonic materials, metamaterials.