Solar collector

Claim 1

In a system for heating a fluid with solar radiant energy, said system including a solar radiant energy collector that carries a fluid medium to be heated by solar radiant energy, the collector having the improvement of: a fluid inlet connecting means; a fluid outlet connecting means; an extruded flat metallic conduit connected at one end to the fluid inlet means and at the opposite end to the fluid outlet means, said extruded conduit having a substantially rectangular cross-section, said conduit including an integrally formed thin barrier defining two separate fluid carrying channels within said conduit, each of said separate fluid carrying channels being substantially rectangular in cross-section; and means connected to one end of said conduit for directing fluid from one of the said separate channels into an adjacent separate channel for defining a serpentine fluid flow path through said collector between said inlet and outlet connecting means, said collector having an exterior of which is of parallelepipedal configuration, and the interior capacity thereof, available for fluid flow therethrough, is more than one-half of the gross cubical bulk of the panel.