Sustainable heating and cooling - the big challenge in times of climate change

More than 40% of the world’s energy requirements are used for heating and cooling, including hot water preparation. With the heat of wastewater, we have a huge energy potential at our disposal, which can be used with state-of-the-art heat exchanger and heat pump technology – economically, efficiently and innovatively!

Building services of the future - with hot water treatment

Day after day, a considerable amount of wastewater accumulates in buildings. With innovative, self-cleaning heat exchangers, it is possible to recover up to two-thirds of the heat from the wastewater and use it efficiently for hot water preparation. The result: less energy consumption, less costs, less CO2 emissions.

Rabmer supplies innovative heat exchanger systems for this:

Heat generator – static system

The wastewater is collected in the mantle of the tower and heats the fresh water in the inner tank.
The heated water is removed from the upper part of the inner container and fed as preheated fresh water to the existing water heating system.

Plate heat exchanger – continuous system

The pre-treated wastewater flows through the countercurrent heat exchanger and heats the incoming fresh water.
A cleaning scraper removes the dirt on the heat exchanger surface daily, whereby an optimal heat transfer is guaranteed.

Basic requirements

Waste water quantity: at least 2 m3 per day
Residential buildings: gray water pipeline separate from fecal waste water; Central hot water available
Spatial proximity of the sewer to central hot water

Area of applications

Baths, sports facilities
Hotel industry, wellness parks
Commercial kitchens, hospitals
Food processing industry
Laundries
Residential complexes
Retirement homes
And much more …

Sewer waste heat heats and cools buildings

If office and residential buildings, hospitals or shopping centers are located near canals with a waste water volume of at least 10 liters per second, these buildings can be heated and cooled with the energy from the wastewater in a particularly economical and environmentally friendly manner. Innovative heat exchanger systems and efficient heat pumps are used here, which significantly reduce energy costs and CO2 emissions for systems with an output of more than 100 kW.

With our proven technologies, we deliver a solution that meets your requirements:

Channel heat exchanger with dry weather channel

Suitable for all channel shapes, quick installation
Optimum use of heat, as it is completely overflowed even in dry weather
Supply and return lines are routed below the heat exchanger to ensure easy maintenance of the channel by the operator

In the tube integrated heat exchangers

For new construction of a canal
Fast and uncomplicated installation

External heat exchangers

For large projects with 500 kW power and more
Wastewater is pumped out of the sewer via a shaft and pre-cleaned via a mechanical filter
By means of externally mounted heat exchanger bundles and heat pumps, extremely high efficiencies (COP 7 to 8) can be achieved

Varied application possibilities - well-known references

Joh. Kepler University Hospital Linz

Use of canteen waste heat for fresh water preheating
50 kW – plate heat exchanger with integrated self-cleaning

Military Hospital Budapest (HU)

Utilization of sewage heat channel for building heating and cooling
3.8 MW heating or 3.2 MW cooling capacity with innovative tube bundle heat pump and heat pump
(Thermowatt Kft.)

Project Study Retirement Home Arnsberg (DE)

Use of sewage waste water for building heating
150 kW heating capacity with Therm-Liner heat exchanger and heat pump

Our services for you:

We are looking for the best technology for your project.
We carry out a feasibility study for you and calculate the profitability.
We take over the implementation including delivery and installation with our partners.
If necessary, we also take care of the maintenance and operation of the system.

We are happy to help

Rainer Wiedemann
Head of energy from wastewater
+43 7230 7213 742
greentech@rabmer.at

Inquire now