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Text description provided by the architect. La Marina del Prat Vermell is an old textile colonial area established in the mid-19th century in Barcelona, south of Montjuïc, very close to the sea. They dyed and dried fabrics on the grass, which gave the neighborhood its name: “Marina del Prat Vermell”, or the Marina of the Red Grass.
The triangle formed by the streets Ulldecona – Cal Cisó – Pontils is a unique plot of land. This determined our response: to maintain the integrity of the triangle in its global organization without compromising the clarity and typological plausibility of the orthogonal internal distribution of the residence. The three vertices of the graph remain as three closed corners without chamfering or simplification.
In order to accommodate a number of social housing units, all with two rooms and with optimal conditions for ventilation, daylight, typology and views, we divided the triangle into two terraces and two passages entirely from north to south, forming Five volumes. There are unique residences on the east and west corners. Rather than opting for a layout of inner triangular block courtyards, which would have been too small and would have produced too many dwellings on the north side, we developed a scheme of blocks consisting of four corner dwellings, guaranteeing the required two hours of sunlight. Regulations between 10 a.m. and 2 p.m.
Depending on the angle, there is a certain ambiguity in the perception of the complex: from the east and west corners it is seen as a single unit block with cracks, while from the south facade five allowable Sunlit volume. The passage at noon avoids the 92 meters of continuous facade, providing a smooth and refined volume. The materialization or dematerialization of blocks changes depending on the position of the observer.
All in all, the building is both compact and porous. Since the geometry of a triangle determines its volume, it is compact. At the same time, it gains porosity through rationalized volumes, divided into equal blocks that accommodate twelve residences per floor, all with a corner layout. As a result, each unit enjoys dual orientation, ventilation and 100% sunlight.
Materials were chosen to minimize the building’s carbon footprint by using lighter components and avoiding excavation in contaminated industrial soil. The façade is designed with alternating vertical glass strips and ribbed GRC (fiber reinforced concrete), colored red and 17 mm thick, recalling the folds of dry fabric on grass. They are transported and positioned using a 120 mm metal frame, with an insulated inner surface and a low thermal conductivity: 0.24 W/m2 K. The corners are open, with wide platforms that follow the geometry of the envelope and are protected by gradient sealing protection louvers. The reinforced concrete structure uses the Bubble-Deck system, which reduces the weight of the slabs by 35% and allows the creation of the necessary cantilevers to adapt to the unique geometry of the site. Bubble-Deck consists of cylinders made from recycled PVC, which reduces weight and carbon footprint.
The project’s form factor, with openings designed to maximize solar gain in winter and provide shading and cross ventilation to all floors in summer, has a total annual energy consumption of as low as 8.76 kWh/m2, is Class A and meets Passivhaus standards, Heating and cooling needs are minimal.
Ecoenergies’ metro biomass network has freed up its roof to install a shared solar photovoltaic power plant, which consists of 89 modules and generates 37.8kWp, covering 51% of consumption. The remainder of the roof has been planted with vegetation, and flower beds have been introduced along the pathways with red flowering plants to promote biodiversity and mitigate the heat island effect. In addition, bicycle racks have been installed on these pathways to facilitate alternative travel.
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