Combustion product condensing water heater
US4502626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Dec 8, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S165/913
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
In a water heating system, vapor in the products of combustion gases is condensed in a secondary heat exchanger positioned in a housing with the primary heat exchanger and combustion chamber. The two heat exchangers are coaxial coils with the secondary coil surrounding the primary. Gases flow radially through the primary coil, axially along a baffle and then axially through the secondary coil at an increased velocity. The gas/air mixture is burned in a burner within the primary heat exchanger and the gas product are drawn through the exchangers by a blower. A water storage tank is designed to enhance stratification of hot water over cooler water. The cooler water is used to condense vapor in the secondary heat exchanger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.