A photovoltaic construction wall is provided, having an inner surface adapted to face an inner enclosed space, and an outer surface adapted to gather energy from the sun when installed. The wall is used in buildings and also in buildings in building complexes. The construction wall includes a multi-layered composite wall comprising plates made from corrugated cardboard, an insulating space and a photovoltaic panel. The multi-layered composite wall has a first inwardly disposed dense, organically based panel to which is affixed a first plate made from corrugated cardboard, the flutes of the corrugated cardboard construction being disposed transversely to the panel surface; a second dense, organically based panel affixed to the aforementioned plate, to the second dense, organically based panel is affixed a second plate made from a denser corrugated cardboard, the flutes of which are disposed transversely to the panel surface, providing inertia to temperature variations; a third dense, organically based panel connected to said second plate, which third dense, organically based panel has a light absorbing layer on an outwardly disposed surface thereof; and, connected to the light absorbing layer or the third dense, organically based panel, a third plate made from corrugated cardboard the flutes of which are disposed transversly to the panel surface. The third plate has an air gap outwardly disposed thereof in which air is free to circulate by means of vents disposed at the extreme ends of the photovoltaic panel. The photovoltaic panel is made up of photovoltaic cells transparent to infrared radiation from the sun. It is structurally connected to the construction wall at a distance defining said air gap and disposed outwardly so as to gather the sun's rays when installed.

The present disclosure includes a prefabricated wall panel that is made from materials which are otherwise waste products in the agricultural and forestry industry. Each wall panel includes lateral and longitudinal channels with a step in the sidewalls thereof to accommodate installation of various items. Some of the sidewalls may also include an additional step further recessed into the channel to accommodate other items. Regardless of the number channels and steps therein, the wall panels are also devoid of any shear sharp corner, such that a curved section is provided between each transition to allow for easier manufacturing with composite materials.

A core layer suitable for a multilayer composite including at least one surface layer and one core layer, the surface layer arranged to at least partially cover the core layer and be fixedly connected thereto, wherein the core layer has elements composed of wood, which elements have plate-like regions arranged in zig-zag-shaped fashion, wherein a plate-like zig region of an element with an adjoining plate-like zag region of the element form a common edge between them, in such a way that the wood element of zig-zag-shaped form is formed, wherein elements of zig-zag-shaped form are arranged in the core layer such that two such edges of two different elements cross one another at a non-zero angle, and wherein the two elements are fixedly connected to one another at the crossing point. In one embodiment, a wood element of zig-zag-shaped form may be adhesively bonded to a planar wood element.