High rise net zero retrofit – the Netherlands

After a successful start bringing the Dutch Energiesprong approach for affordable, desirable, long-term performance guaranteed net zero energy (NZE) retrofits to Europe for single family homes (E=0), the coming three years we will see Energiesprong develop a market for apartment buildings in North West Europe under project: Mustbe0, funded by Interreg NWE. The UK, France, Germany and the Netherlands will join forces to create a viable path to scale.

Utrecht – “Flat with a future”

An ambitious project:

The complete renovation of an outdated Intervam flat on the Camera Obscuradreef in Utrecht, the Netherlands.
 
After a successful pilot with 8 homes that were made net zero in 10 weeks, construction company VIOS refurbished a total of 252 apartments and 15 new homes in the same neighbourhood to net zero energy homes. This was just the starting point for the Housing Organisation Mitros.

Goals:

In addition, all homes also included a new kitchen, bathroom and toilet. New stucco, interior paintwork, interior doors, H&S work, switchgear, and new interior installations throughout. Asbestos must be remediated and we completed 15 new homes.

The successful project has received a lot of media attention and, at the end of 2019, it received an award at the prestigious Green Solutions Awards in the Sustainable Renovation category.

Technical specifications:

  • Performance guarantee: 10 years
  • Energy use before the renovation: 225 kWh/m2 per year
  • Energy use after the renovation: 50 kWh/m2 per year
  • Divided over energy use:
  • Heating: 10,9 kWh/m2 (including ventilation)
  • Warm Water: 14,2 kWh/m2
  • Cooling: 0 kWh/m2
  • Household consumption: 24,8 kWh/m2
  • Energy savings: 175 kWh/m2 per year
  • Production of energy through solar panels to achieve net zero energy: around 50 kWh/m2 per year

Most important elements:

  • Ventilation by means of balanced ventilation with a Heat Recovery Unit
  • CO2 controlled (system D)
  • Air-water heat pump
  • PV (solar panel) Insulation
  • Entire shell thermally insulated:
    roof: Rc= 6
    closed façade: Rc = 4,5
    open façade, triple glas: U-value = 0,5
    ground floor: Rc = 4,5
    cold bridges removed by local insulation and thermal breaks

Cooperation:

Click here for the complete photoalbum

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