Furnace heat exchanger
US6484798B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2000 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F13/08
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A multipass heat exchanger with return bends between passes has its first return bend which varies in cross sectional area in the direction of the of the gas flow. The cross sectional area first increases so as to thereby reduce the velocity of the flue gas, decrease the flue side heat transfer coefficient and decrease the resulting hotspots. The cross sectional area is then increased in a more downstream portion of the return bend so as to not increase the overall height of the heat exchanger. The variation preferably occurs throughout the entire span of the return bend, with the increase in cross sectional area beginning at the start of the return bend.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.