Stoves and furnaces – Liquid heater – Fluid fuel burner for other than top-accessible vessel
Patent
1992-07-02
1993-08-10
Jones, Larry
Stoves and furnaces
Liquid heater
Fluid fuel burner for other than top-accessible vessel
126350R, 126350D, F24H 100
Patent
active
052339700
ABSTRACT:
A semi-instantaneous water heater is disclosed. The water heater generates domestic hot water by transferring heat from the circulating fluid of a modulating boiler. It is particularly suited for use in a combination system, which provides both space and water heating. The semi-instantaneous design incorporates a small cylindrical tank containing stored hot water and an immersed heat exchanger. The heat exchanger is a helical coil disposed in the annular space between two metal sheets that have been rolled into cylinders. The coil conveys heated fluid from the boiler. Heat from the coil is transferred to the water, which is admitted to the tank via the helical passageway formed by the two sheets and the inter-coil space of the helix. The heat exchanger effectively transfers heat by forced convection at a high rate when required by a high flowrate of water. Its disposition in the tank also permits good heat transfer by free convection to quiescent water in the tank when this heating mode is required. The stored volume of hot water provides thermal capacitance to meet brief draws of hot water without short period on/off cycling of the boiler. It also aids in maintaining temperature stability when the hot water flowrate is turned up or down. The small size of the tank allows for effective thermal insulation, thereby minimizing heat loss.
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Harmony Thermal Company, Inc.
Jones Larry
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