US Patent 10113817 Heater core

A heater core includes a plurality of plate pairs. Each plate pair defines a respective fluid flow chamber. Each plate pair has a proximal plate defining a respective proximal plate plane and a distal plate defining a respective distal plate plane. Each of the proximal plate planes and the distal plate planes are parallel. Each plate pair has bilateral symmetry about a medial plane orthogonal to the proximal plate planes. A circular inlet aperture is defined in each respective proximal plate and each respective distal plate of the plurality of plate pairs. Each inlet aperture has a center on the medial plane. The inlet apertures are aligned on a common inlet aperture axis. A circular outlet aperture is defined in each respective proximal plate and each respective distal plate of the plurality of plate pairs. Each outlet aperture has a center on the medial plane.