Effective heat capacity of exterior Planar Thermal Mass (ePTM) subject to periodic heating and cooling

▸ For certain ePTM under sinusoidal heating and cooling, thermal storage is constant. ▸ There is no “insulating effect of mass” under sinusoidal heating and cooling. ▸ The time lag and decrement factor show similarity characteristics-independent of environment temperatures. ▸ A wood wall is better than a same-thickness concrete wall as exterior walls.