Racional

Cidade Nova Building

Another high-standard project built by Racinal which added a contemporary look to the Cidade Nova neighborhood in downtown Rio de Janeiro. The building was designed to meet the specific needs of the end user.

 

Sustainability concepts were adopted from scratch taking into account the location, soil control, waste disposal, lighting and energy efficiency, use of water and the recovery of the surrounding area.

 


Cidade Nova was the first commercial building to attain LEED certification in Brazil> It was also the first to be certified by the US Greenbuilding Council as a LEED Certificated Core & Shell building in Latin America and the second outside the United States.

 

The building features three underground floors with diaphragm walls and seven floors in reinforced concrete cast on site with large free spans. 

  • Technical sheet

    City: Rio de Janeiro
    Built-up area: 51,558 m²
    Execution timeframe: 8 months
    Year of completion: 2007
    Client: Confidere Incorporadora e Imobiliária Ltda.

  • Hiring mode

    Construction Manager at Risk (CM@Risk)

  • Certifications

    The first commercial building to achieve LEED certification in Brazil. It was also the first commercial building to be certified by the US Greenbuilding Council as a LEED Certified Core & Shell in Latin America and the second outside the United States.                                                                                                                                                                                                                                                                                                                                                                                       For soil control stringent and rigorous methods were applied for decontamination and disposal of soil, in addition to careful site excavation. The project for the building prioritized the use of recycled and recyclable materials and new materials were aligned with carbon credits and/or certificates.                                                                

    The concern with the predominant use of natural lighting was one of the project's basic premises aimed not only at energy efficiency but also at the integration of users. Insolation control was done by technology applied to construction, including the use of low emissivity glass and double glass facade. There was also the concern with landscaping and the orientation of the building in relation to the wind direction.                                                                                                                                    

    As a key feature of the project, energy efficiency was achieved by focusing on the main energy consumer in this system - the air conditioning - whose consumption accounts for 50 to 60% of a building of this size. In this respect, as well as measures taken for thermal comfort, an air conditioning system was designed to: reduce CFC emission through the choice of gas; increase energy efficiency of the equipment; generate chilled  water by multiple air chillers with ample modulation capacity, and treat the outdoor air. The air distribution system is optimized through the raised floor, assigning different areas for heat use and combat. The skylight system, which increases energy efficiency through the "daylight" effect uses natural heat and not electricity in its thermal protection system.                                                                                

    Optimization of water use is done through the collection of rainwater and the air conditioner condensation water. This is responsible for supplying 40% of the expected daily water consumption through reuse of this water for washing, irrigation and toilets. Furthermore, other devices were used to reduce water consumption, such as timed taps.  

  • Project differentials

    The building was designed and built with no smoke detectors and uses the daylighting to bring natural light to environments. The building has high performance low-e type glass used on the skylight of the central atrium measuring 30 x 30 m and on the facades, which are composed of double glass wall frames to reduce the heat inside the building, the so-called chimney effect, and improve acoustics in work areas through the reduction of external noise.

     

    The project could interfere with the local subway line and excavation work was therefore changed from four to nine phases in addition to other preventive measures.

     

    Steel profiles were introduced next to the barrette piles to allow for the construction of the concrete structure from the top down.

     

    Bad quality soil made the excavation process difficult and required a reassessment of the techniques and machines used.

     

    To ensure the well-being of users and as a result of the safety study of the surrounding area, the masonry, frame and glass services of the building’s south and east faces were built using level III ballistic protection of according to NIJ STD 0108.01 standard from the USA.

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