US4169430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular heat exchangers with a common flue
Assignee: Individual
•
Filing: 1977-08-03
•
Granted: 1979-10-02
•
Expires: 1997-08-03
Abstract
Abstract A heat exchanger system for preferably heating water in a space heating system, in which a plurality of heat exchanger units are connected in parallel between inflow and outflow conduits for the fluid to be heated, said heat exchanger units being housed in a common duct constituting a flue for gaseous products of combustion from said units.
Inventors
- 👤 Harry A. Cheetham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
F; F24; F24D; F24D3/00; F24D17/00; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/145
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A heat exchanger system comprising a plurality of separate individual modular heat exchanger units each having an inlet for fluid to be heated, an outlet for fluid heated in the unit and a burner, said units being connected in parallel between an inflow conduit connected to each inlet and an outflow conduit connected to each outlet, said heat exchanger units being housed in a common duct constituting a flue for gaseous products of combustion from said units.
Claim 2
Dependent Claim
77 words
A heat exchanger system comprising a plurality of separate individual modular heat exchanger units each having an inlet for fluid to be heated, an outlet for fluid heated in the unit and a burner, said units being connected in parallel between an inflow conduit connected to each inlet and an outflow conduit connected to each outlet, said heat exchanger units being housed in a common duct constituting a flue for gaseous products of combustion from said units.
Claim 3
Dependent Claim
22 words
A heat exchanger system as claimed in claim 1, wherein the duct is vertical and said units are disposed one above another.
Claim 4
Dependent Claim
23 words
A heat exchanger system as claimed in claim 1, wherein each unit is carried by and extends from a wall of the duct.
Claim 5
Dependent Claim
15 words
A heat exchanger system as claimed in claim 1, wherein the duct is thermally insulated.
Claim 6
Dependent Claim
18 words
A heat exchanger system as claimed in claim 1, wherein each heat exchanger unit comprises a water heater.
Claim 7
Dependent Claim
17 words
A heat exchanger system as claimed in claim 1, wherein each heat exchanger unit is gas fired.
Claim 8
Dependent Claim
56 words
A heat exchanger system as claimed in claim 1, wherein each heat exchanger unit consists of two spaced apart headers, one header having said inlet and the other having said outlet, said two headers being interconnected by tubes provided with extended surfaces, said tubes defining a combustion space and a burner located in said combustion space.
Claim 9
Dependent Claim
86 words
A heat exchanger system as claimed in claim 1, wherein each heat exchanger unit consists of two spaced apart headers, one header having said inlet and the other having said outlet, said two headers being interconnected by tubes provided with extended surfaces, said tubes defining a combustion space and a burner located in said combustion space, said tubes being arranged in an annular array to define a substantially circular combustion space and said burner being located on the axis of said combustion space and extending axially.
Claim 10
Dependent Claim
69 words
A heat exchanger system as claimed in claim 1 wherein each heat exchanger unit consists of two spaced apart headers, one header having said inlet and the other having said outlet, said two headers being interconnected by tubes provided with extended surfaces, said tubes defining a combustion space and a burner located in said combustion space, and including a fan for supplying a gaseous fuel/air mixture to the burner.
Claim 11
Dependent Claim
17 words
A heat exchanger system as claimed in claim 1, wherein said duct is connected to a chimney.
Claim 12
Dependent Claim
26 words
A heat exchanger system as claimed in claim 1, including a control system for turning off the units sequentially in dependence upon a decrease in demand.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |