Heat exchange – Structural installation
Patent
1984-06-18
1985-11-05
Davis, Jr., Albert W.
Heat exchange
Structural installation
126435, 165 70, 16510414, 16510419, F28D 1500
Patent
active
045507716
ABSTRACT:
Waste water heat transfer apparatus is disclosed in which the waste water from residential or commercial uses such as washing, etc., is passed into a separate drain and then into a heat exchanger which includes a waste water conduit therein, and then to the sewer drain. A supply water conduit extends through the heat exchanger generally paralleling the waste water conduit and has fresh water run therethrough in a direction opposite to that of the flow of waste water to an outlet end, after which the supply water is provided to a water heater. The heat exchanger interior is filled with a heat transfer liquid, and is so divided by baffles that a temperature gradient is formed in the heat transfer liquid adjacent to the waste water conduit, with the liquid being warmest adjacent the inlet of the waste water conduit and decreasing in temperature toward the outlet of the conduit. The supply water, flowing in the opposite direction to that of the waste water, has its lowest temperature at its inlet end, which is adjacent the lowest temperature heat transfer liquid, and encounters progressively warmer adjacent heat transfer liquid as it rises upwardly in the heat exchanger toward its outlet end. A substantially constant temperature differential is thereby maintained throughout the heat exchanger between the waste water within the waste water conduit and the adjacent heat transfer liquid, and between the supply water in the supply water conduit and the adjacent heat transfer liquid.
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