BOILERS, PUMPS & VALVES


will feed the recovered energy into the district heating network and provide additional heat to around 15,000 homes. For the city, Johnson Controls will provide a


custom-made heat pump solution with six high performance screw compressors, delivering a total system output of 42 MW. The heat pumps will extract low-temperature heat from the flue gas of a large waste-to-energy facility – raising the overall efficiency of the plant significantly. To maximise the waste heat extraction and further increase efficiency, the units will be applied as three pairs of heat pumps operating in series, reducing the lift required, and expected to boost efficiency by as much as 30%. The operating conditions are ideal for the heat


Powering the city of Zürich using recycled waste heat


A


ccording to the European Heat Pump Association, heat accounts for more than 60%


of energy use in European industries and there is significant potential to meet this need using freely available ambient or waste heat sources. In fact estimates suggest that wasted heat in the EU could meet the bloc’s entire energy demands for central heating and hot water. Heat pumps can harvest this heat – for example fromland, water, air or industrial processes – and


are typically three to four times more efficient than conventional systems. As an example, Johnson Controls, is to provide


green heat to the city of Zürich through a new waste incineration project spearheaded by the municipal utilities of Zürich ERZ (Entsorgung & Recycling Zurich). The project entails the expansion of the plant with a third process line and heat recovery from the flue gases. As part of the project, Johnson Controls’ heat pumps


pumps as they are positioned first in a combination of multiple heat sources that raises the temperature before being supplied back to the grid. This ensures the optimum overall efficiency of the plant. Operations will start in 2027, with the solution


being one of the largest in Europe to use the zero Global Warming Potential (GWP) refrigerant ammonia in a heat pump application on this scale. “The City of Zürich is actively committed to


achieve net carbon neutrality by 2040 and a major part of this is the increase of carbon free supply of heat. By teaming up with Johnson Controls, we’re further driving momentum in the heat transition and paving the way toward a more sustainable future,” commented Jürg Bruder, ERZ.


Johnson Controls www.johnsoncontrols.com/


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ENERGY & SUSTAINABILITY SOLUTIONS - Autumn 2025


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