Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1991-06-21
1992-09-01
Ford, John K.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 47, 165163, 165 66, 165909, 4598, 4545, 236 1214, F24D 1700, F24H 116
Patent
active
051431491
ABSTRACT:
A heat recovery system with a heat exchanger and a mixing valve. A drain trap includes a heat exchanger with an inner coiled tube, baffle plate, wastewater inlet, wastewater outlet, cold water inlet, and preheated water outlet. Wastewater enters the drain trap through the wastewater inlet, is slowed and spread by the baffle plate, and passes downward to the wastewater outlet. Cold water enters the inner tube through the cold water inlet and flows generally upward, taking on heat from the wastewater. This preheated water is fed to the mixing valve, which includes a flexible yoke to which are attached an adjustable steel rod, two stationary zinc rods, and a pivoting arm. The free end of the arm forms a pad which rests against a valve seat. The rods and pivoting arm expand or contract as the temperature of the incoming preheated water changes. The zinc rods expand more than the steel rod, flexing the yoke and rotating the pivoting arm. The pad moves towards the valve seat as the temperature of the preheated water rises, and away as the temperature falls, admitting a variable amount of hot water to maintain a nearly constant average process water temperature.
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Constant Richard E.
Dixon Harold M.
Ford John K.
Moser William R.
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