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Title: Wastewater heat recovery apparatus

Abstract

A heat recovery system is described 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.more » 6 figs.« less

Inventors:
Issue Date:
OSTI Identifier:
7276005
Patent Number(s):
5143149 A
Application Number:
PPN: US 7-718518
Assignee:
PTO; EDB-94-088659
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Patent File Date: 21 Jun 1991
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; HEAT RECOVERY EQUIPMENT; DESIGN; WASTE WATER; HEAT RECOVERY; PROCESS SOLUTIONS; TEMPERATURE CONTROL; CONTROL; DISPERSIONS; ENERGY RECOVERY; EQUIPMENT; HYDROGEN COMPOUNDS; LIQUID WASTES; MIXTURES; OXYGEN COMPOUNDS; SOLUTIONS; WASTES; WATER; 320304* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization

Citation Formats

Kronberg, J.W. Wastewater heat recovery apparatus. United States: N. p., 1992. Web.
Kronberg, J.W. Wastewater heat recovery apparatus. United States.
Kronberg, J.W. Tue . "Wastewater heat recovery apparatus". United States.
@article{osti_7276005,
title = {Wastewater heat recovery apparatus},
author = {Kronberg, J.W.},
abstractNote = {A heat recovery system is described 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. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {9}
}