Primary heat exchanger having improved heat transfer and condensate drainage
AssigneeCarrier Corporation
InventorsLarry D. Rieke, Timothy J. Waterman
Life of this patent
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Abstract
In a multi-poise furnace having multiple parallel heat transfer stages, each stage having superimposed flow passages lying in a common plane. The last passage in each stage containing laterally-disposed indentations in opposed side walls for increasing the heat transfer surface area, and the walls of the last passage being further configured to conduct any condensate formed in the heat exchanger out of the exit region of the exchanger, regardless of the furnace orientation.
Claims17
In a multi-poise furnace, a primary heat transfer stage for exchanging energy between internal heated flue gases and external comfort air, said stage including
- a series of interconnected flow passages that are superimposed in a plane for conducting flue gases between an entrance region in the first flow passage and an exit region in the last flow passage in said series,
- said last flow passage in the series containing top and bottom walls and opposed side walls having laterally- disposed indentations formed thereon that extend from the bottom wall partially up said side walls to establish a restricted flow path in the bottom section of said last flow passage and an unrestricted flow path in the top section of said last flow passage adjacent the top wall for increasing the heat transfer surface area of said last passage.
A primary heat exchanger for use in a multi-poised furnace that includes
- a housing having a supply air duct through which return air is passed,
- a series of parallel heat transfer stages mounted in spaced-apart relationship within said supply air duct,
- each stage having interconnected flow passages that are superimposed in a plane for conducting flue gases between an entrance region in said first flow passage and an exit region in the last flow passage of the stage,
- said last flow passage in each stage having top and bottom walls and two opposed side walls and further including laterally-disposed indentations in said opposed side walls that extend from the bottom wall partially up the side walls to establish a restricted flow path in the bottom section of said last flow passage and an unrestricted flow path in the top section of said last flow passage.
Dependencies are inferred from the claim text.