The roof and wall surfaces become heat collectors as they are.
Can we use the roof and walls as heat collectors?
That was the idea that led to the creation of PAC housing in 1977.
Nowadays, it is common practice to install a ventilation layer on the wall, but even so, the ventilation layer does not collect heat.
The figure on the left shows a PAC house with a heat-collecting ventilation layer on the wall, and the figure on the right shows a wall ventilation layer for draining moisture in an ordinary house.
The original purpose of the wall ventilation layer shown on the right was to ventilate the moisture trapped in the insulation material (glass wool).
It is also called an external-external ventilation layer, and it takes in the outside air from under the ventilation layer and lets it out again from above. This naturally does not collect solar heat in the house.
The theme of the ventilation layer was to remove the moisture that accumulates in the glass wool.
The ventilation layer of a PAC house is a more active issue and is an architectural method (passive method) that uses the roof surface and walls as heat collectors.
In order to collect solar heat, we have developed a system that connects the bottom and top of the ventilation layer to the inside of the house. The solar heat hitting the roof surface and walls creates an upward airflow that draws air into the house from the bottom of the ventilation layer, warms the air in the ventilation layer, and then draws the warmed air into the house from the top of the ventilation layer.
It was 1979.
The necessary components are PAC’s special insulated air dampers, insulated roof dampers, and insulated air intakes.