Automatic flue gas heat recovery system

Details Automatic flue gas heat recovery system Automatic flue gas heat recovery system

1981-09-18

1983-02-22

Makay, Albert J.

Liquid heaters and vaporizers

Subsidiary

126 31, 165 40, 165DIG12, 122421, 236 21R, F22B 3300, F24C 1300

Patent

active

043745067

ABSTRACT:
An automatic flue gas heat recovery system for supplementing or replacing a conventional, separate hot water system. In the example described, the heat recovery system is applied to a pizza restaurant where large quantities of heat energy are normally wasted up an oven chimney stack, and large quantities of hot water also are required for restaurant operations. An electric motor driven pump circulates water in a closed loop between a storage tank and a heat exchanger tube located in the oven chimney stack. A thermostat control automatically starts the pump when the oven heats the chimney stack to an effective water heating temperature. When temperature in the storage tank reaches a predetermined maximum, the thermostat control stops the pump, opens a drain valve, and dumps water quickly and completely from the heat exchanger tube. Three different embodiments are shown and described illustrating systems with one or more storage tanks and one or more pumps. In the plural storage tank embodiments, an existing hot water heating tank may be converted for use to augment a main tank supplied with the present system.

REFERENCES:
patent: 2372086 (1945-03-01), Kahn
patent: 3096021 (1963-07-01), Lintvedt
patent: 3896992 (1975-07-01), Borovina
patent: 3999709 (1976-12-01), Estabrook
patent: 4048962 (1977-09-01), Pristelski
patent: 4066210 (1978-01-01), Pemberton
patent: 4136731 (1979-01-01), DeBoer
patent: 4143817 (1979-03-01), Oliver
patent: 4211187 (1980-07-01), Farris
patent: 4216903 (1980-08-01), Giuffre
patent: 4246886 (1981-01-01), Sitzlar

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