SUSTAINABILITY


therefore the energy needs of its buildings: a fully decarbonised kWh is a kWh that is not used. The recent steep rise in energy prices and their current volatility reinforces this reduction and control approach. This approach was also supported in France by the deployment of the RT 2005 and then RT 2012 regulations.


l Next, controlling the energy source to meet its needs: depending on the region’s offer, the choice shifts to energies that meet needs (e.g. a distribution temperature regime) and carbon neutral targets. The arrival of RE 2020 tends to favour the emergence of zero-carbon sources of energy production.


l This ultimately results in the selection of energy production architecture (biomass boiler, solar panels, etc.) that meets needs while also offering a zero-carbon source of energy.


Final energy consumption profiles Needs Reducing the carbon footprint of a healthcare facility in terms of needs is tackled on two sides: l The static part, the envelope’s performance, which includes losses through walls, ingress, or solar gains.


l The dynamic part, usage, i.e. consumption linked to fresh air and air quality, domestic hot water and processes.


Regarding static needs, over the last twenty years, we can see that successive thermal regulations have led to a stark improvement in building envelope performance, in terms of insulation, joinery, thermal bridges, and airtightness. This technical approach, combined with a bioclimatic approach, helps manage the building’s envelope (Fig 2).


70 60 50 40 30 20 10 0


RT 2005 RT 2012 RE 2020 Regulations


Figure 2. Envelope performance: static heating needs per m2 for a tertiary building.


18 n Inpatient wards n Surgical department Figure 3. Energy consumption profiles – feedback from delivered project. IFHE DIGEST 2024


50 45 40 35 30 25 20 15 10 5 0


3.5 3.0 2.5 2.0 1.5 1.0 0.5 0


Heating consumption 70 60 50 40 30 20 10 0


n Inpatient wards n Surgical department


Domestic hot water consumption


n Inpatient wards n Surgical department Cooling consumption


W/m2


Source: AIA Life Designers projects kWh/m2 kWh/m2 kWh/m2


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