FR006 Retrofit of 112 flats with no outdoor unit

The replacement of a fossil fuel central heating system with individual exhaust air HPs
in each flat offered a ready-made compact solution for ventilation, SH and DHW.

The aim of this renovation is to improve the energy label of the flats to reduce the tenants’ energy bills and carbon footprint by 50%, but also to improve comfort through various means, making the district more attractive. The building was constructed in 1963 and had an energy label rated D for energy consumption and F for greenhouse gas emissions.

Works on the building envelope:

The façades were rebuilt and insulated from the outside and the windows were replaced. The roofs have been redone. All flats have balconies of almost 4 m². The halls have been extended with the construction of an overhang, and the stairwells have been refurbished.

Works on Space Heating, DHW, and ventilation:

The collective boiler room for heating and the individual bath heaters for DHW production were eliminated in favor of an individualized solution, and a mechanical ventilation system was created in the flats using a NIBE F730 exhaust air heat pump. This heat pump provides heating and domestic hot water for the dwelling, as well as the mechanical ventilation system, to ensure good air quality for the occupants of the flats.
A small VMC network had to be created because the flats had natural ventilation. The radiators were replaced and fitted with thermostatic valves.
A current sensor has been installed on the general power supply of each flats. Controlled by the heat pump regulation system, it enables load shedding if necessary.

Result of the energy label after energy renovation: A for energy consumption and A for greenhouse gas emissions.

Lessons learned

• Compact all-in-one solution with no oudoor unit, ideal to replace individual SH/DHW boiler
• Simplified installation

DE012 Heat in the West