Sep 03, 2013 · Drain water heat recovery systemsalso known as drainline or gravity film heat exchangerscapture energy from graywater and use it to preheat supply water. Typically installed in the basement as part of the drainage stack, the systems lead to either a hot water tank or to an appliance that concurrently uses hot water and produces warm wastewater, such as a shower.
Waste heat energy recovery domestic water heating systems use a desuperheater for water heat recovery, sometimes called a waste heat exchanger. The heat recovery units are designed for waste heat recycling in order to convert a standard boiler into a heat recovery boiler.
Drain-Water Heat Recovery Department of EnergyDrain-water heat recovery technology works well with all types of water heaters, especially with demand and solar water heaters. Drain-water heat exchangers can recover heat from the hot water used in showers, bathtubs, sinks, dishwashers, and clothes washers. They generally have the ability to store recovered heat
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Heat Exchangers for Solar Water - Department of EnergySolar water heating systems use three types of heat exchangers:Liquid-to-liquid A liquid-to-liquid heat exchanger uses a heat-transfer fluid that circulates through the solar collector, absorbs heat, and then flows through a heat exchanger to transfer its heat to water in a storage tank. Heat-transfer fluids, such as antifreeze, protect the solar collector from freezing in cold weather.
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