Heat recovery system for domestic waste water - uses smell trap with helical tube as water preheating heat exchanger

摘要

The heat recovery system recovers heat from waste water from washing basins, sinks, bidets and showers. These sanitary installations have hot and cold water supply and smell trap in outlet. Heat recovered is used for fresh water preheating . The smell trap itself or a connected vessel forms heat exchanger with a helical tube coil. Water from cold water supply flows through this helical coil and cold water is warmed by the waste water heat. The preheated water flows into a hot water boiler or moxing valve. The whole waste water vessel and heat exchanger can be built into a boiler tank.