Case Study: nZEC - New construction of 242 dwellings in Bulevar de Salburua, Vitoria-Gasteiz, Spain (UNDER MONITORING)

Short Description

The building consists of a 21-storey tower and a U-shaped continuous block of variable height from four to seven stories. On the ground floor the entrance halls and nine commercial portals are sited. There are two basement floors that occupy the entire field and are used for garages, storage and technical rooms. The remaining area is occupied by public housing.

The building was designed from energy saving premises. In addition to the facilities of a usual apartment building, this building includes the installation of cogeneration system which is complementary to conventional thermal production of a centralized boiler with individual management. This system covers part of the demand for hot water and heating of the building. The CHP group consumes natural gas to generate 109 kW of thermal power in a single process by taking advantage of the heat generated in the engine cooling and exhaust fumes. This is achieved with a significant reduction in CO2 emissions to the atmosphere.

Key Elements

Certification

The building developed by obtained the highest energy rating in Spain, A. This high rating was achieved due to the compactness of the building, its high insulation, the low transmittance of the windows and the efficiency of their facilities.

Work with Residents

Initial conversation that included the system description and advice, visit homes to the description, ongoing assessment (on demand) for rational use of heating and DHW.

Other Renewables

In addition to the facilities of a usual apartment building, this building includes the installation of cogeneration system which is complementary to conventional thermal production of a centralized boiler with individual management. This system covers part of the demand for hot water and heating of the building. The CHP group consumes natural gas to generate 109 kW of thermal power in a single process by taking advantage of the heat generated in the engine cooling and exhaust fumes. This is achieved with a significant reduction in CO2 emissions to the atmosphere.

Thermal Insulation

Facades: 5cm of fiberglass insulation + 8cm of rockwool Roof: 10cm XPS + 4cm of rockwool. Slabs insulated. Dwelling separation insulated.

Windows and Shading

Tilt windows with micro-ventilation system. 4 +10 +4 inner glass with low-e glazing. Aluminum shutter. Elements of sunscreen on all fronts. U window: 2.72 W/m2 K.

Funding

Natural cross ventilation system. Air exchange system.

Heating and Hot Water

Centralized hot water and heating system based on cogeneration engine of 70 kWe and two low-temperature boilers of 895 kWt each. Cogeneration provides 100% of the hot water demand and 11% of the heating demand.

Cooling

There is no cooling.

Electricity Saving Products

Energy-saving lights in common areas. Lighting community spaces equipped with lights twilight detectors (day/night). Lighting of public spaces lamps equipped with motion detectors. Low-power appliances (energy class A).

Water Saving

Separative network for stormwater and greywater. System for reusing greywater. WC with dual flush. Faucets with aeration (flow reduction).

Environmental Design

The south facades function as scavenger sunlight, their holes are wider, floor to ceiling, protected with shutters to mitigate heat loss at night. The south facade is provided by terraces that serve as umbrellas, shading the windows during the summer. Native vegetation in gardens. Materials with low environmental impact and lifecycle control. Use of recyclable materials in deconstruction. Use of recycled materials. Standardized construction process.

Monitoring

Click here to access the monitoring data on the HIVE Database!

Main Results

Lessons learned

Additional Information

Ms Maria Jesús Gascó
AVS - The Spanish Association of Social Housing and Land Providers
E-mail: mjgasco@promotorespublicos.org
Web: www.promotorespublicos.org