The mass is represented by the different separating structures of the tempered spaces of the building (floor + wall + slab).
Different materials can be considered as active heat storage to different depths of thickness, depending on their thermal conductivity.
E.g. 2200 kg/m3 concrete active heat storage mass is 422 kg/m2, 1700 kg/m3 solid brick wall: 184 kg/m2, 800 kg/m3 multi-cavity brick: 36 (!) kg/m2, 600 kg/m3 wood 18 kg/m2.
The higher the heat storage performance of a layer of material, the longer it can store heat in winter and the slower it heats through summer.
The heat storage mass of the building is the sum of the heat storage mass of all heated rooms. The specific heat storage mass of the building is the mass of the unit heat storage projected on to the net heated floor area of the building.
Based on the specific heat storage mass, the separated structure of the building:
– heavy if m > 400 kg/m2
– light if m < 400 kg/m2
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