thermal lag, definition of

Thermal Lag

Thermal lag describes a material's thermal mass in terms of time. A material with high thermal mass (high heat capacity and low conductivity) will have a high thermal lag. In effect the addition of (or removal of) energy from one side of the mass 'lags' with respect to the other side.

Thermal lag can be a useful feature, as for instance an outer brick wall on the Sunny Sunset side of a house in Winter would radiate its heat into the property in the evening, aiding with heating.

Thermal lag effects are often incorporated into good passive solar design for buildings.

News & Blog articles where 'thermal lag' used:
  • Wrong Again, Again
    Guest Post by Willis Eschenbach One of the best parts of new tools is new discoveries. So the tools to calculate the heat constants of the ocean and land as described in my last post, Lags and Leads, reveal unknown things to me. A while back I wrote...

Related Tags: insulation, passive solar, buildings, sustainable development, energy efficiency

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