De State is a 70-metre-high, 23-storey residential tower in Amsterdam, completed in March 2020. The building comprises 305 homes and has 32,500 m² of living space. Its energy system is based on a collective geothermal field comprising 104 closed-loop circuits installed beneath the building. The configuration uses around 100 heat pumps rated at 4.5 kW: some homes have their own unit, while others share one between four or five apartments to provide heating and cooling and domestic hot water.

The high level of insulation and airtightness enables low-temperature heating, between 27 and 31 °C, alongside balanced ventilation. Each home also has individual hot water storage, generally between 150 and 200 litres, a solution intended to reduce losses associated with heat distribution.

The building was designed with an Energy Performance Coefficient of 0.15 and incorporates 1,045 photovoltaic panels. The case also identifies challenges specific to high-rise residential buildings, including limited space for equipment and storage, restricted roof area for photovoltaics and the need to adapt residents’ habits to the operation of the hot water system.

Key figures:

• Building condition: New building
• Building type: High-rise multi-family residential building, 305 homes
• Delivery year: 2020
• Primary energy consumption: Not specified in the source
• Energy performance certificate rating: Not specified in the source
• Renewables: Collective geothermal field with 104 closed-loop circuits and approximately 100 heat pumps; 1,045 photovoltaic panels.
   

_{Picture source: www.heatpumpingtechnologies.org}