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Disclosed is an improved water heater and method of heating water retained in a storage tank having a flue passing through it. The apparatus and method directs hot gases flowing upwardly along the flue toward the flue\s wall when heat transfer between those gases and the water is desired. The appara

Disclosed is an improved water heater and method of heating water retained in a storage tank having a flue passing through it. The apparatus and method directs hot gases flowing upwardly along the flue toward the flue\s wall when heat transfer between those gases and the water is desired. The apparatus and method also directs the air or gases flowing upwardly within the flue away from the flue\s wall when heat transfer is undesirable. The apparatus includes a plurality of moveable flow control fins secured at various locations along the length of a baffle by supported iwthin the flue. Each fin is secured to the baffle by a piece bi-metallic material whose shape changes in response to its temperature. When hot gases flow through the flue during a water heating mode, the bi-metallic pieces position the fins near the middle of the flue along the baffle\s length and direct the flow of hot gases outwardly toward the flue\s wall. When relatively hot gases are not passing through the flue and the only gas or air flow in the flue is that associated with a pilot burner, for example, the bi-metallic pieces sense the relatively cooler gas/air flow and position the fins near the flue\s wall where they obstruct flow along the wall and direct it along the central axis portion of the baffle.

대표청구항 ▼

An improved apparatus for exchanging heat between a first fluid retained within said apparatus and a second fluid flowing through said apparatus, said apparatus comprising: a storage tank for retaining the first fluid, a flue means passing in heat exchange relationship with the first fluid in said s

An improved apparatus for exchanging heat between a first fluid retained within said apparatus and a second fluid flowing through said apparatus, said apparatus comprising: a storage tank for retaining the first fluid, a flue means passing in heat exchange relationship with the first fluid in said storage tank, the first fluid being in heat transfer contact with a first surface of said flue means, and the second fluid flowing through said flue means being in heat transfer contact with a second surface thereof; and flow control means disposed within said flue means for directing said second flowing fluid toward said second surface of said flue means when heat exchange is desired between the first and second fluids, and for directing said second flowing fluid away from said second surface of said flue means when heat exchange between the first and second fluids is undesirable.