The ratio of heat output to electricity used is between 4 and 6 (depending on the application).
Often, this value is also indicated as "SPF" (seasonal performance factor).
Heating and Cooling with Wastewater from the Sewer System
Future-oriented and sustainable solution for heating and cooling of buildings
The HUBER ThermWin process allows heating and cooling of buildings by using the wastewater in the sewer system as a regenerative energy source.
Right below the ground, in sewers, is a hidden and seldom used source of energy: our wastewater. Its temperature is usually between 12° and 20° C and hardly drops below 10° C even in winter, making wastewater an ideal energy source for operating a heat pump.
All larger buildings and local heating networks are suitable consumers of the heating energy obtained in this way.
HUBER Wastewater Heat Exchanger RoWin installed in boiler room
Above ground, parallel installation of two HUBER Wastewater Heat Exchangers RoWin
The HUBER Heat Exchanger HUBER RoWin enables the use of wastewater as a regenerative energy source and energy sink.
The Process
Heat Extraction from the Wastewater
As a link between the wastewater and heat pump, a heat exchanger is required to extract the heat energy contained within the wastewater. The heat exchanger transfers the thermal energy from the wastewater to the heat pump.
The HUBER ThermWin process uses the HUBER Heat Exchanger RoWin. The specific feature of this system is that the actual heat extraction from the wastewater takes place above ground and not in the sewer. All required system components are easily accessible and easy to maintain.
The HUBER ThermWin process allows both heating (wastewater releases thermal energy) and cooling (wastewater absorbs thermal energy).
In the HUBER ThermWin process, a partial stream of the wastewater flowing through the sewer is first passed through the HUBER Pumping Stations Screen ROTAMAT® RoK4, which removes the coarse material from the wastewater. The wastewater is then pumped through the heat exchanger installed above ground and flows back into the sewer. Heat exchange with the secondary circuit, which is coupled with the heat pump, takes place within the heat exchanger. The heat exchanger used is the HUBER Heat Exchanger RoWin, specially developed for wastewater.
The HUBER ThermWin process uses wastewater as a long-term secure and constantly renewable energy source to provide an environmentally friendly and sustainable method for heating and cooling buildings. Fossil energy sources such as gas, oil or coal can be saved and CO2 emissions are minimised – a contribution to the fight against climate change.
Downloads
Customer Information and Documents
FAQ
Frequently Asked Questions
A wastewater heat exchanger is a heat exchanger that is suitable for operation with wastewater.
The wastewater heat exchanger must be designed in such a way that the solids contained in the wastewater do not cause any operating faults.
In addition, deposits (biofilm) form very quickly on the heat exchanger surfaces when operating with wastewater, so that regular cleaning of the heat exchanger surfaces is necessary, otherwise performance will be reduced. The HUBER Heat Exchanger RoWin is specially designed for operation with wastewater.
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.
