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Recover the heat from used water

Heating water is responsible for half of the energy use in a house. But once you’ve used it, the water runs away down the drain. The heat could have been used to pre-heat the new cold water that is on its way in. In Canada, grants are available for installing heat recovery systems for showers to capture this heat.

This is how the system works: Waste water from the shower passes through a copper drain pipe and “clings” to the sides, transferring the heat to the metal. A thin copper pipe supplying fresh, cold water is coiled around the drainpipe. So the cold water is not in direct contact with the waste water but is still able to absorb its heat. The cold water enters the house at perhaps 10 degrees Celsius, but the absorbed heat from the waste water has raised its temperature by about 10 to 20 degrees Celsius before the water arrives in the hot water tank.

It is also possible to use a heat pump to recover the heat from waste water. A water-to-water heat pump requires large amounts of water to be profitable, and is therefore mostly used in high volume situations like housing complexes or commercial kitchens. Husby Amfi in Stjørdal in Nord-Trøndelag, Norway consists of 56 low-energy houses which recover heat from waste water. To heat the tap water, planners chose a solution not previously used in Norwegian housing. The water is heated by a heat pump which absorbs the heat from all wastewater other than from toilets. This heat source makes the heat pump extra effective: one kilowatt hour of electricity produces five kilowatt hours of heat.

Read more:
http://www.menerga.no/Artikkler/Artikkel-Sorlandsbadet.pdf http://www.arkitektur.no/?nid=85429&pid0=92058
http://www.menerga.no/Artikkler/Artikkel-Sorlandsbadet.pdf
http://www.rorfag.no/article/20090108/SANITAER/294998097
http://www.passivhusnorden.no/foredrag/Session %204%20-%20Olav%20Trygvason%20-%202%20april%20-%201530/Passivhus%20Lier.pdf http://www.passivhusnorden.no/foredrag/Session%204%20-%20Olav%20Trygvason%20-%202%20april%20-%201530/Passivhus%20Lier.pdf