PIRELLI’s SKYSCRAPER – Complete refurbishment of all technological plants
Project which won the public contract tender issued by Regione Lombardia for the complete refurbishment of all technological plants in the building.
- electric power from network: 8 MW
- cooling power : 5,5 MW
- 5400 points controlled by BMS
Commisioned by: ELECA Spa (Cantù)
Services provided by ARIATTA: Detailed design for Tender
Building area: about 60.000 sqm
Project start/Project finish: 1997
This is the project that represented a turning point in the approach to energy related themes by the city of Milan.
The project dates back to 1997 and concerned the complete refurbishment only of the technological plants within the entire building, to be realized with the building constantly in use (just one or two floors at a time was/were emptied of people).
Although, at that time, the use of groundwater for technological purposes was absolutely prohibited by all laws and technical norms in force in Lombardy, we still decided to propose the extensive use of groundwater for our project, demonstrating the great advantages of it in terms of energy/economic saving and practical feasibility of the intervention (in fact, a large quantity of asbestos was present in all plants, making it impossible to intervene on them without first implementing plants that needed to be completely independent from the existing ones).
Besides winning the international tender, the strength of our technical, economic, operational arguments and our reasoning on energy and on the feasibility of the project was such that Regione Lombardia promoted the bringing in line of all existent laws and technical norms involved to allow the utilization of groundwater for technological purposes.
In particular, groundwater is used for
- the pre-cooling of external air (estimated energy saving of around 50% of the cooling output needed to treat primary air)
-the removal of condensation heat of the centralized refrigeration units and the local independent air conditioning units; the use of groundwater allows to reach lower condensation temperatures than in traditional water cooling tower systems, improving the energy efficiency of the machines and allowing a significant reduction in the electric energy absorbed for the same amount of cooling energy generated. As a result, a further energy saving of at least 20% on the total cooling output is achieved.
- the independent air conditioning units change into “heat pumps” and, exploiting groundwater as a “cold well”, provide heating to the building, achieving an extremely high level of energy efficiency.