Harnessing Wastewater for a Climate-Neutral Berlin
Achieving climate goals requires bold changes to the energy supply of our cities. At KWB, in collaboration with Berlin Wasserbetriebe (BWB), we are embracing this challenge. Through the SWEET-HEAT project, we are investigating how the hidden heat in wastewater can be harnessed to heat buildings sustainably and efficiently, keeping the entire city in mind.
The vision behind SWEET HEAT
Berlin possesses immense untapped potential: theoretically, around 5% of the city’s heating needs could be met using heat from wastewater. This would represent a significant step towards a climate-neutral heating system. The technology already exists, and heat exchangers are currently in operation. However, to fully exploit this potential, we require accurate data, improved planning tools, and answers to key questions such as:
Where is it most effective to implement this technology?
How do temperatures vary throughout the sewer network?
What long-term impact do heat exchangers have on the system's temperature dynamics?
How can the economic and environmental benefits be quantified?
Our Mission
SWEET-HEAT is driven by data-based solutions. With highly resolution measurements and advanced simulation, we analyse…. the temperature dynamics within Berlin's sewer network. Our ultimate aim is to establish a reliable decision-making framework for integrating wastewater heat into urban energy planning, whether for individual buildings or entire neighbourhoods.
The project in practice
To turn this vision into reality, we are adopting a hands-on approach:
Data Collection: We continuously monitor temperatures at key points within a pilot zone in Berlin's sewer network. These measurements consider building types, wastewater sources (residential or industrial), and sewer conditions.
Simulation Modelling: The data is then input into a comprehensive simulation model based on EPA-SWMM, which enables us to map the thermal processes within the sewer network.
Impact Analysis: The model enables us to assess the impact of heat exchangers on the system and analyse the long-term behaviour of wastewater.
Our long-term goal
Leveraging these insights, SWEET-HEAT aims to optimise the technical, economic, and ecological recycling of wastewater heat. Our findings will facilitate the integration of this innovative energy source into Berlin’s urban energy system, contributing to a greener, more sustainable future.
