Lawrence Berkeley National Laboratory — Heat Island Group / Cool Surfaces

Snapshot

Why it matters internationally

LBNL is not a classical emissivity-metrology institute, but it is one of the most influential public research groups working on thermal emittance and solar reflectance in the context of buildings, urban climate, and energy demand. The Heat Island Group explicitly defines cool roofs and cool walls through those two radiative properties and ties them to urban- heat-island mitigation and energy performance. For the built-environment branch of emissivity / reflectivity research, LBNL is indispensable.

Scope of activity

Relevant unit

• Heat Island Group — Cool Surfaces research (LBNL). Long-running research program on thermal emittance and solar reflectance as the defining radiative properties of cool roofs, cool walls, and the broader cool-surface literature.

Radiative properties measured / targeted

Thermal emittance · solar reflectance — treated jointly as the defining pair that governs passive cooling performance at building and city scale.

Methodology

Research on cool roofs and cool walls defined through thermal emittance and solar reflectance; linkage to urban-heat-island mitigation and energy performance in the built environment.

Application domains

• Cool roofs and cool walls
• Buildings and urban climate
• Urban-heat-island mitigation
• Energy demand in the built environment

Why LBNL is a reference pole

Emissivity stops being an abstract optical quantity once it is tied to measurable consequences at urban scale: summer energy consumption, heat-wave mortality, city air temperature. LBNL’s Heat Island Group is arguably the most important public research group making that translation, and it is why the map cannot be confined to laboratory metrology alone. Whatever metric a city eventually chooses to regulate a cool surface, the vocabulary — thermal emittance and solar reflectance — traces back through work of this kind.

External sources

• Cool Roofs — Heat Island Group (LBNL)