Abstract: Systems, tools, and methods are presented that enable a plurality of turbulators to enhance heat transfer within a heat exchanger of a heating, ventilating, and air conditioning (HVAC) system. The plurality of turbulators each include a ribbon member having a variable pattern formed over a length. In one instance, the variable pattern of the ribbon member includes a plurality of bends defining intervals of alternating pitch. The intervals progressively increase in dimension as the ribbon member is traversed over the length. In another embodiment, the intervals contain apertures whose area increases as the length is traversed. Other systems, tools and methods are presented.

Abstract: Systems, tools, and methods are presented that enable a plurality of turbulators to enhance heat transfer within a heat exchanger of a heating, ventilating, and air conditioning (HVAC) system. The plurality of turbulators each include a ribbon member having a variable pattern formed over a length. In one instance, the variable pattern of the ribbon member includes a plurality of bends defining intervals of alternating pitch. The intervals progressively increase in dimension as the ribbon member is traversed over the length. In another embodiment, the intervals contain apertures whose area increases as the length is traversed. Other systems, tools and methods are presented.

Abstract: A covering apparatus for an enclosure presenting a ventilating barrier curved with respect to a barrier axis includes a segmented panel member having a plurality of louvered areas. Respective adjacent louvered areas of the plurality of louvered areas are separated by a respective bend structure. Each respective bend structure has a first section departing in a first direction from a first bend axis and a second section departing in a second direction from a second bend axis. The first and second bend axes are generally parallel with the barrier axis. The first direction is generally away from the second bend axis. The second direction is generally away from the first bend axis. The bend structure further has a third section extending from the first and second bend axes to a third bend axis. The third bend axis is non-coplanar with the first and second bend axes.