Below are shown a selection of case studies. These are by no means all of the examples we know about, but these have been chosen to ensure a range of examples are shown. They span a range of locations, a range of thermal sizes, a range of uses (e.g. commercial, industrial, municipal) etc.
The Hobart aquatic centre covers around 7,500m2 and uses wastewater heat recycling via heatpumps.
The system has been in operation since approximately 1995.
Located in the city of Straubing. There are 102 apartments spread over 5 buildings, these provide community housing for aged residents. The buildings were renovated in 2010 and the gas fired central heating system changed to a wastewater heat recycling system via heatpumps and radiators.
Around 9 million people live in the coastal city of Qingdao, which has suffered from high pollution levels, like many other coal-powered cities in the PRC.
When it comes to heating, the city is pursuing a truly innovative approach. Qingdao is investing in a clean district heating network covering 180 km2 that will make use of air, ground, and wastewater source heat pumps in order to reduce the requirement for polluting coal power plants.
The Haus der Bayerischen Geschichte museum is located in Regensburg and was completed in 2019.
The museum is both heated and cooled using wastewater heat recycling, with thermal capacities of 560kW in heating mode and 1000kW in cooling mode.
This 28-Level office building is located in the Swiss city of Winterthur. In 2011 it was retrofitted with a wastewater heat recycling system to provide both heating and cooling.
The thermal capacities are 480kW in heating mode and 840kW in cooling mode.
The NWC project is an ambitious effort to convert the 94 acres in north Denver that host the annual National Western Stock Show into a 250-acre development to be used throughout the year. The site will be heated via a wastewater source district heating system providing around 4MW thermal capacity.
The MOM Cultural Centre is located in Budapest, Hungary and it provides 8,600m2 of mixed use floor area. The wastewater heat recycling system provides around 1,100kW of heating/cooling at COP's around 7 - 8 and has been in operation since 2011.
This military hospital is located in Budapest, Hungary. It provides 600 beds over 40,000m2 of floor area. The wastewater heat recycling system provides around 3,500kW of heating/cooling at COP around 7 and has been in operation since 2014.
The wastewater treatment plant in Shijiazhuang, processes 600,000 m3 of wastewater every day. The plant uses a wastewater heat pump to recover heat from hot industrial wastewater, which is then distributed to over 7,000 homes through a district heating network.
This aquatic centre utilises a wastewater heat recycling system with a capacity of 250kW and it has been in operation since 2014.
Looking to cut costs and reduce carbon emissions, the Aspirant Dunand pool in Paris’ 14th arrondissement uses heat pumps to recycle residual warmth from wastewater. The installation covers nearly half of the pool’s energy consumption, was completed in 2016 and has been operating effectively ever since.
This hospital is being retrofitted with a wastewater heating/cooling system with 17MW thermal capacity. The new system will provide clean energy to the Toronto Western Hospital, using recovered heat from wastewater and the sewage system. This will cover about 85% of the hospital's heating and cooling needs.
The new 1,400m2 headquarters for DC Water was completed in 2018 and designed to exceed the requirements for LEED Platinum. The building heating and cooling loads are met by using wastewater and heatpumps.
Planned for construction in 2021 - 2022, this system will recover wastewater heat at the treatment plant, and use this via heatpumps to heat 20,000 houses in a district heating system.
In operation since 2015, this wastewater heat recycling system has a thermal capacity of around 440kW and provides both space heating and cooling. This system contributed to LEED® Gold certification for the facility, eliminating the need for an air conditioning cooling tower.
The Aqualibrium aquatic centre is located in Campbelltown, Scotland and utilises a wastewater heat recycling system that has been in operation since 2019.
The Budapest Sewage Works sewage heat recycling system serves around 12,000 m2 of mixed floor area. The wastewater heat recycling system provides approx 1,200 kW heating/cooling with COP’s 3.5-to 4 and has been in operation since 2015. Plans have also been made to extend the system to provide heating and cooling for a department store and cultural centre in the nearby.
The Metro Sports Centre is located in Christchurch and is scheduled to open in 2022. It will be the largest aquatic and indoor recreation and leisure venue in New Zealand.
At over 30,000m2, the Centre features a 50 meter, 10-lane competition swimming pool and a separate diving pool, large aquatic leisure area, five hydroslides, fitness spaces and nine indoor courts for sports such as netball, volleyball and basketball. The facility will cater for the needs of the recreational, educational and high-performance sporting communities.
The building 3.5MW heating and cooling loads will be met by using wastewater and heatpumps.
Being constructed over phases, SE False Creek is a district heating system with the majority of heating coming from wastewater source heatpumps. The red buildings above show customers currently connected to the 3.2MW system (as of 2021) and the blue buildings indicate future customers who will connect once the 6.6MW expansion project is complete.
The Borders College campus transitioned off gas fired boilers and started using wastewater heat recycling in 2015.
The thermal capacity of the system is 800kW and the system is estimated to save the College around £10,000 per year and 170 tonnes CO2 per year.
The Arras aquatic center wastewater heat recycling system was completed in 2017.
The thermal capacity is 500kW.
This 19,500m2 building in central Stuttgart houses over 600 staff from three different Government Ministries. It was completed in 2012 and uses wastewater to provide over 500kW of heating and almost 750kW of cooling.
The Panorama Aquatic Centre on Saanich Peninsular was retrofitted with a wastewater heat recycling system in 2011. The system takes wastewater heat from the nearby wastewater treatment plant (around 650m away) and is designed to eventually be a district heating system also connecting to three nearby sites consisting of: primary school campus, ice rink, plant research centre and also some buildings on the wastewater treatment plant site.
The Oslo Sandvika District Heating & Cooling system was started 1989. It uses wastewater source heatpumps to provide 23MW total heating capacity & 19MW total cooling capacity .
In the Tokyo's Bunkyo-ward Koraku 1-chrome area is a district heating & cooling network using wastewater as its thermal source, and servicing office buildings, hotels and commercial facilities over an area of 21Ha.
The system was started in 1994.
The Szeged University Study and Information Centre covers around 15,000 m2 floor area. The sewage heat recycling system takes wastewater heat from the nearby wastewater pumping station (around 700 m away) while the heat pumps are onsite. The wastewater heat recycling system provides around 1,300 kW heating/cooling with COP’s 4 to 4.5 and has been in operation since 2015.
Two municipality buildings and a market hall are located in Budapest and together cover 20,000 m2 floor area. This wastewater hat recycling system consists of one wastewater heat recovery station with heat pump, and a separate heat pump station. The wastewater heat recycling system provides approx 1,700 kW heating/cooling with COP’s 4-to 5 and has been in operation since 2017. One heat pump provides simultaneous heating and cooling.