City heat
Johnson Controls has announced that it will 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 feed the recovered energy into the district heating network and provide additional heat to around 15,000 homes. Starting operations in 2027, the solution is one of the largest in Europe to use the zero Global Warming Potential (GWP) refrigerant ammonia in a heat pump application on this scale.
For the city of Zürich, Johnson Controls will provide a custom-made heat pump solution with six high performance screw compressors, delivering a total system output of 42MW. 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%.
