Case Studies

Original situation

The original building, located in the city of Madrid, consists of eight floors above ground for offices, and two more below ground, for parking, storage rooms and building services rooms. Two facades, located in the corner of the plot, are orientated to north and west, and the other two are party walls. In the southeast corner there is a courtyard for lighting and ventilation of the common areas.

It was built in 1972 using a traditional construction system: concrete floors and pillars, a double-leaf brick facade, flat roof without insulation, and anodized aluminium exterior framing with double glazing.

Renovation approach

The tenants have moved in and the monitoring is about to start.

Modernisation proposal

In this retrofit, the EnerPHit standard will be achieved through the Energy Demand Method. It is a complete renovation including the following actions:

-Building envelope insulation (facades, roof, floor towards basement and interior walls between apartments and staircase)

-Ventilated facade installation

-Windows, doors, and roller shutter replacement

-Airtightness improvement

-Ventilation system with heat recovery installation

-Heating and cooling systems renovation

-Existing thermal bridges improvement

-Accessibility improvement

-Orientation improvement by means of removing the service staircase located next to the courtyard, in order to several apartments have a south-facing facade

-Photovoltaic system installation

After the retrofit there will be six floors above ground for apartments, ground floor for access, storage rooms and building services rooms, and three floors more below ground for parking.

Efficiency improvement

No calculations available for the existing building. A comparison is not possible as the main use of the building has changed, and therefore the occupancy, schedule, internal heat gains, etc.

The reference values of efficiency improvement of EnerPHit standard can be taken into account.

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