In an effort to develop a new appliance, a "Breathing Wall," that can efficiently be used in a passive solar system designed for temperate climate regions, we investigated the transition and thermal characteristics of an aluminum foil-constructed, multi-airlayered body. Since such bodies have been reported to have advantages/disadvantages, based on these, we carried out a design calculation which led to the construction a prototype wall having an experimentally determined thermal conductance of 0.43 W/m^2-℃. The wall is 70-mm-thick and has eight airlayers between aluminum foil sheets separated by horizontally running spacers placed at 10-cm intervals from top to bottom.
