The Ministry of Mines and Energy (MME) today launched (19) studies aimed at stimulating the discussion and use of energy efficiency technologies in the construction sector by adopting digitization measures. These tools can be used throughout the life cycle of a building. According to the study, the potential to reduce energy consumption in the construction sector could reach 40% by 2050, representing a total gain of 161 TWh.
This value, according to the director of the Energy Monitoring Department of the Ministry of Municipality and Environment, Carlos Alexandre Pierce, is comparable to the annual electricity consumption of about 3,360 thousand homes and is equivalent to 815,000 tons of carbon (tons of carbon dioxide) of avoided emissions, helping the country achieve the agreed goals them to reduce greenhouse gases.
Perez said during a video conference to launch the survey. “Digitization in these construction phases is critical to achieving climate goals in construction. Enabling carbon-reducing potential, embedded in materials and construction processes.”
The study on Digitization and Energy Efficiency in the Construction Sector in Brazil was conducted in cooperation with the German government and analyzed 20 digital solutions that can contribute to energy efficiency throughout the life cycle of a building.
These solutions include the adoption of management and automation techniques. building computer modeling software; Management and data security technologies, used from designing and modeling buildings, and increasing a building’s energy performance for years, such as solar guidance, ventilation and envelope systems, among others.
Moreover, the digitization of building processes can drive the standardization of components and building processes associated with efficiency measures.
Among the cases analyzed through the study is the construction of a condominium in the neighborhood of Katumbi, in Rio de Janeiro, under the Minha Casa, Minha Vida program, with apartments ranging from 46.21 sq m to 43.46 sq m.
The changes, obtained after simulations at the design stage, led to changes in the orientation of the buildings which, together with the elongated shape of the blocks, favored natural ventilation. There was also a trend for better environments, such as bedrooms, bathrooms, kitchens, and living rooms; insert balconies to shade the facade; increase the size of the tires to increase the natural lighting; Installing a solar water heating system. and thermal insulation of the roof (reflective blanket).
These and other changes resulted in an energy efficiency increase of 1,776 kWh/year (considering a multi-family building as a whole) or a 3.13% decrease compared to the previous model.
Another example is the company building, in the Vila Olímpia neighborhood, in São Paulo, with a built-up area of 257,799 square metres. Measures to increase energy efficiency have been adopted from the design stage to property use, such as implementing a Building Management System (BMS) in operation; High-efficiency interior lighting system and high thermal performance glazing with low solar factor, resulting in a 49.9% reduction in energy consumption.
The document also identifies three scenarios for increasing digitization tools in the building sector, which include the residential, commercial and public sectors: one slower, one moderate, and one for the rapid introduction of digitization.
According to the study, these scenarios could be exacerbated by the continuation of the economic crisis and the decline in economic growth and other factors, such as the implementation of various sectoral public policies in an uncoordinated manner, without synergy between the competent authorities; The lack of specific lines of credit for implementing digital solutions in the premises, and the lack of a precise definition of roles and responsibilities in relation to the use and warranty of equipment built into the building.
In the slower digitization scenario, the document notes that energy efficiency gains are low, standing at levels below 10% of a total of 161 TWh by 2050. This is comparable to the annual electricity consumption of up to about 840 thousand households, and the equivalent to avoiding emissions of about 200 thousand tons of carbon dioxide.
In a moderate scenario, the energy efficiency potential of digitalization would reach levels of 20-30% of a total of 161 TWh by 2050, compared to the annual electricity consumption of about 2,520 thousand households, the equivalent of avoiding system emissions. 610 thousand tons of carbon dioxide.
The energy efficiency potential, resulting from rapid digitization, will reach levels of 30-40% of a total of 161 TWh by 2050, compared to the annual electricity consumption of about 3,360 thousand homes, and the equivalent of avoiding emissions of about 815,000 tons of carbon dioxide.
“Digitalization in the building sector is being implemented at a rapid pace in the country, strongly driven by the state, with significant participation of private investment and rapid adoption of digital technologies. It covers all types of buildings, as a result of the effective integration of various institutional and regulatory mechanisms aimed at digitization, energy efficiency and housing”, states the document.