> It's also not clear how quickly heat can be extracted from the bricks. This is a commonly defined material property [1]. You would simply size your bricks to

> It's also not clear how quickly heat can be extracted from the bricks. This is a commonly defined material property [1]. You would simply size your bricks to suit the situation - given same volume, more surface area means faster heat flow. [1] https://en.wikipedia.org/wiki/Thermal_conductivity https://en.wikipedia.org/wiki/Thermal_conductivity