Primary heat exchanger design for condensing gas furnace

摘要

A compact furnace heat exchanger for a gas furnace is disclosed. The compact furnace heat exchanger may include a first pass having an inlet end, a second pass in fluid communication with the first pass through a first return bend, and a third pass having an outlet end and in fluid communication with the second pass through a second return bend. The third pass may further include a plurality of irregularities for optimizing performance of the compact furnace heat exchanger and the associated gas furnace.

主权项

1. A compact furnace heat exchanger, comprising
a first pass having an inlet end; a second pass in fluid communication with the first pass; and a third pass having an outlet end; the third pass in fluid communication with the second pass and having a plurality of irregularities, and the first pass, the second pass and the third pass forming a continious flow passage, the plurality of irregularities including at least one up bead extending partially upwardly from a lower surface/edge of the third pass towards an upper surface/edge of the third pass and at least one down bead extending partially downwardly from the upper surface/edge towards the lower surface/edge of the third pass.