The wood has a high thermal inertia, specific heat, cp, according to EN ISO 10456, 1600 J/(kg K), which is associated with a significant volume weight of 480kg/m3.
Heat-storing materials help to optimise energy consumption as they also absorb radiant heat from the winter sun when it is low in the sky and can use that energy to “heat” the living space for a time. They can also prevent loss of the heat produced by the heating system. Such utilisation of solar gain can be accomplished by internal as well as external components. Wood represents an excellent medium in that regard because it has a very good specific heat capacity.
That means that, despite their good thermal insulation properties, structural components made of Massiv-Holz-Mauer® and elements of timber ceilings achieve very high heat storage capacities and can utilise large amounts of solar gain.
In summer, those properties ensure that storage of the sun’s energy prevents the interior of the building heating up immediately on sunny days. Instead, heating up of the rooms is delayed by several hours.
Construction elements with MHM elements can produce a phase shift of more than 12 hours. That means that the energy stored during the day does not start to warm up the interior until night time, thereby creating a stable interior atmosphere even when there are large outside temperature fluctuations.
Important: Regardless of the nature of the other structural components, effective shading of the window areas is always necessary.