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Waste water heat recovery

Waste water contains energy that can be used in buildings for heat and indoor cooling. It is a hidden energy potential that is currently not being used. By implementing the technology we have developed, it is possible to reduce energy costs and CO2 emissions, as well as the dependence on external energy suppliers.

Waste water heat recovery unit

The device is intended for energy supply, functioning as a provider of heating, hot water, and indoor cooling in houses, industrial facilities, food factories, etc. It requires a connection to a waste water line. The demand for heating and cooling is not simultaneous, and waste water serves both as a supplier of energy and as its accumulator. The operating efficiency of the device can be calculated as a sum of the heat energy transferred to the building and the heat energy transferred as part of indoor cooling, divided by the electricity consumption required to power these processes.

The operating cycle of the heat pump can generate two energy resources: cold and heat. Both of them are necessary in the production of food. The waste water resulting from the production process has energy potential and energy storage properties.


Feasibility estimate
Preparation of the technical solution
Short production time of the equipment


What does waste water heat recovery mean?
Waste water contains heat potential, which can be recovered efficiently before the waste water is discharged into the waste water collection system.
When is it efficient to recover waste water before discharging it into the waste water collection system?
It is efficient in apartment buildings, public buildings, industrial buildings; importantly, these buildings must have a demand for hot water and heating.
What is the heat recovered from waste water used for?
It produces hot water and provides heating in buildings, and in summer, after heat is removed from the waste water, it can be used for indoor cooling, thus increasing the heat potential, which in turn can be used for hot water production.
How can heat be recovered from waste water?
This cycle can be implemented using a waste water heat exchange tank that contains a patented waste water heat exchanger; this technology is the intellectual property of S plus, patented worldwide.
How can indoor spaces be cooled with waste water?
Once the heat pump uses the heat exchange tank to transfer the heat potential of the waste water to hot water and heating, the waste water cools down. The patented S plus waste water heat exchange technology makes it possible to use this cooled waste water for indoor cooling, in free cooling mode.
Is it efficient to cool indoor spaces with waste water, but why do it at all?
Indoor cooling and hot water demand cycles do not take place at the same time. Hot water demand peaks in the morning and evening, while indoor cooling peaks during the afternoon and evening. The S plus technology enables the storage of waste water in a heat exchange tank, so that it can accumulate both heat and cold, allowing the necessary potential to be used, with a time delay as needed. When cooling indoor spaces in free cooling mode, the cooling supply chiller is not used, improving indoor cooling efficiency 8 to 12 times.
Is the waste water generated in the building sufficient to fully produce the hot water it needs by recovering the heat?
The waste water generated in the building is not sufficient to fully produce hot water if the indoor free cooling cycle is not working. The missing heat for the preparation of hot water is brought in from the ground circuit or boreholes.

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