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US 6,666,173 B2Granted
Hot gas liquid heater
OwnerDavid R. Dickinventor
Life of this patent
Estimating the term…
Abstract
A hot gas water heater has a housing, and at least a pair of concentric coils in the housing through which liquid to be heated is sequentially passed. Each coil has a helical tube with adjacent turns connected by a web member such that the tube and web member form an imperforate coil wall. Hot gas passes sequentially between the coils in co-current flow with liquid flow in one adjacent coil and counter-current flow with liquid flow in another adjacent coil.
Claims5
A hot gas water heater having:
- a housing, and
- at least a pair of concentric coils in the housing through which liquid to be heated is sequentially passed,
- each coil having a helical tube with adjacent turns connected by a web member such that the tube and web member form an imperforate coil wall,
- whereby hot gas passes sequentially between the coils in co-current flow with liquid flow in one adjacent coil and counter-current flow with liquid flow in another adjacent coil, and
- at least one coil tapering towards an adjacent coil in the direction of gas flow therebetween to compensate for contraction of the gas as it cools.
2 more elements
Dependencies are inferred from the claim text.