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Thermal mass is a concept in building design that describes how the mass of the building provides "inertia" against temperature fluctuations, sometimes known as the thermal flywheel effect.[1] For example, when outside temperatures are fluctuating throughout the day, a large thermal mass within the insulated portion of a house can serve to "flatten out" the daily temperature fluctuations, since the thermal mass will absorb thermal energy when the surroundings are higher in temperature than the mass, and give thermal energy back when the surroundings are cooler, without reaching thermal equilibrium. This is distinct from a material's insulative value, which reduces a building's thermal conductivity, allowing it to be heated or cooled relatively separate from the outside, or even just retain the occupants' thermal energy longer.
So when you have a brick oven, such as The New York Brick Oven Company's revolving brick oven, that is dense and thick(several thousand pounds) you have a higher thermal mass than the routine pizza ovens which translates to having consistently cooked pizza and a more energy efficient design. Having a thick revolving deck aslo uses thermal mass to hold oven heat and cook evenly without hot and cold spots due to the continuous rotation. This was proven out in real world trials at the Iconic Goodfella's Brick Oven Pizza of New York when they replaced one of their fast casual pizza concept's 8 ft. interior surface standard brick ovens with a New York Brick Oven Inferno Series revolving brick ovens. This one change made for more consistent and faster production allowing them to realize about a $40,000 a year reduction in labor. The labor saving came from no longer needing to use the second 5 ft. standard oven for the rush and reducing the number of employees during non- peak hours with the revolving brick oven. Not to mention less fuel with operating a single oven as opposed to two ovens.
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