| 摘要 |
A fuel-fired, condensing type forced air heating furnace is provided with an improved hot combustion gas-to-air heat exchange system which includes a generally drum-shaped primary heat exchanger having an outlet end connected to a first end of a transfer manifold whose second end is connected the inlet end of a fin-and-tube type secondary heat exchanger which is spaced laterally apart from, faces, and extends generally parallel to the primary heat exchanger. A radial discharge fuel burner end portion is coaxially positioned within an inlet end of the primary heat exchanger and, during furnace operation, a draft inducer fan draws burner combustion gases sequentially through the primary heat exchanger, the transfer manifold and the secondary heat exchanger while air to be heated is flowed externally over these heat transfer elements. The overall heating efficiency of the furnace is improved, and the fabrication cost of the furnace is reduced, by the use of the radial discharge burner, a perforated baffle wall which improves the air heating capacity of the manifold, and a weldless mechanical crimp roll joint construction used to fabricate and interconnect the primary heat exchanger and transfer manifold.
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