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Title: Wastewater heat recovery apparatus

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.
Authors:
 [1]
  1. (108 Independent Blvd., Aiken, SC 29801)
Publication Date:
OSTI Identifier:
868445
Report Number(s):
US 5143149
DOE Contract Number:
AC09-89SR18035
Resource Type:
Patent
Research Org:
WESTINGHOUSE SAVANNAH RIVER CO
Country of Publication:
United States
Language:
English
Subject:
wastewater; heat; recovery; apparatus; heat; recovery; heat; exchanger; mixing; valve; drain; trap; heat; exchanger; inner; coiled; tube; baffle; plate; wastewater; inlet; wastewater; outlet; cold; water; inlet; preheated; water; outlet; wastewater; enters; drain; trap; wastewater; inlet; slowed; spread; baffle; plate; passes; downward; wastewater; outlet; cold; water; enters; inner; tube; cold; water; inlet; flows; upward; taking; heat; wastewater; preheated; water; fed; mixing; valve; flexible; yoke; attached; adjustable; steel; rod; stationary; zinc; rods; pivoting; arm; free; arm; forms; pad; valve; seat; rods; pivoting; arm; expand; contract; temperature; incoming; preheated; water; changes; zinc; rods; expand; steel; rod; flexing; yoke; rotating; pivoting; arm; pad; moves; towards; valve; seat; temperature; preheated; water; rises; temperature; falls; admitting; variable; amount; hot; water; maintain; nearly; constant; average; process; water; temperature; water temperature; water inlet; water inlet; water inlet; water inlet; inner coil; steel rod; steel rod; heat recovery; heat recovery; valve seat; valve seat; cold water; cold water; cold water; inner tube; heat exchange; heat exchange; heat exchanger; heat exchanger; hot water; nearly constant; baffle plate; baffle plate; water outlet; water outlet; water outlet; heated water; heated water; heated water; heated water; process water /165/4/236/