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Heating and Cooling with Wastewater

Using waste water as a sustainable and regenerative energy source

Heat pumps have established themselves as an energy-efficient and sustainable option for heating and also cooling buildings.

For heating, the heat pump extracts the heat from a medium and then raises it to a higher temperature level, thus enabling heating of a building. For cooling, it is the other way round: heat is extracted from the building and transferred to a medium.

Heating and cooling with wastewater -  a very interesting regenerative energy source for energy-efficient and sustainable heating

Heat pumps have established themselves as an energy-efficient and sustainable option for heating and also cooling buildings.

For heating, the heat pump extracts the heat from a medium and then raises it to a higher temperature level, thus enabling heating of a building. For cooling, it is the other way round: heat is extracted from the building and transferred to a medium.

Wastewater is an interesting heat source

The medium from which the heat pump extracts heat can be the air, the ground, groundwater, a body of water or even wastewater.

Since the heating of buildings is particularly necessary in the colder months of the year, it is important to know the temperature of the medium from which the heat is extracted at that time. The higher the temperature, the higher the efficiency of the heat pump.

In winter, the wastewater temperature is

  • at least as high as the soil temperature
  • at least as high as the groundwater temperature
  • higher than the temperature in bodies of water
  • significantly higher than the air temperature

This makes wastewater a very interesting heat source for energy-efficient and sustainable heating

FAQ

Frequently Asked Questions

Basically, a certain temperature level is necessary. Municipal wastewater typically has temperatures of 10 - 25 °C, which allow ideal operation of a wastewater heat exchanger. To avoid excessive fouling of the heat exchanger, pre-screening of coarse solids (> 6 mm) is recommended.

Almost any type of water can be used for heat recovery if pre-screened properly. This includes, for example, water from surface waters, wastewater from industrial processes, grey water or black water in the municipal sector or already purified water from the sewage treatment plant outlet.

Heating or cooling of building complexes, feeding recovered heat into heating networks for example in industrial areas/parks, cooling of wastewater to comply with official effluent discharge requirements.

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We welcome your enquiries and want to offer you the best possible support for your projects.

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