Near Zero Energy Building: A new way to invest in the future
Starting from January 2021 new buildings will have to be built under the nZEB Standard > High Energy Performance buildings that minimize the consumption of heating, cooling, ventilation, lighting and production of ACS (domestic hot water).
nZEB a law at the service of the community
An "almost Zero energy building" (nZEB - near Zero energy Buildings), as defined by the European Directive 31/2010/EU, is a high energy performanceBuilding, whose energy requirements (very low or almost nil) should be Covered to a very significant extent by energy from renewable sources.
With the D. Lgs 192/2005, Italy has transposed the European Directive 31/2010/EU and art. 4a treats the matter of "buildings with almost zero energy, indicating, in paragraph 1, that all newly built private buildings, starting from January 1, 2021, will have to be made using the nZEB (almost zero energy) mode.
nZEB a promise of sustainability
The definition of "Quasi-Zero Energy building" uses primary energy as a unit of measure for the evaluation of the energy balance. The term "quasi-zero energy" refers in fact to the calculation of the annual primary energy consumption for the management of the building, including cooling, heating, ventilation, lighting and power supply
Beyond regulatory obligations and definitions, the design strategy of a nZEB building is aimed primarily at reducing energy needs through the use of energy-efficient technologies (building envelope strongly Isolated), secondly, to produce sufficient energy from renewable sources (solar thermal, solar photovoltaic, aerothermic or geothermal energy) in order to significantly cover the annual consumption of energy.
A building of this type is characterised by high levels of thermal insulation and high efficiency systems.
nZEB an intelligent casing for excellent performance
An optimum level of thermal insulation is capable of guaranteeing excellent thermal protection of the building envelope and is essential for achieving high levels of energy efficiency. Most of the heat in the "conventional" buildings is dispersed through the exterior walls, the roof and the floor. This principle is reversed in the summer and warmer climatic zones: alongside external sunblinds and energy-efficient appliances, the thermal insulation ensures that the heat remains out while keeping the interior pleasantly cool.
the use of high performance fixtures (typically with triple glass) allows you to trap the heat of the sun during the cold winter months, while in the summer to convey more solar energy at home than the heat they release outward.
The study and accurate correction of thermal bridges (careful design of connections between building components), real weaknesses in a structure, allows to avoid major heat loss.
nZEB High energy efficiency plants
A Nzeb building is characterised by high-efficiency systems consisting of heat pumps (air-water or water-water) that are highly efficient with a compressor inverter (DC-inverter type modulation) used for the Winter/Summer Air conditioning and for the production of sanitary hot water for the toilets (in combination with a special thermal accumulator for A.C.S.).
The "Almost zero energy" building cannot be separated from a ventilation system with heat recovery. This system, called VMC (controlled mechanical ventilation), guarantees a constant supply of fresh air, clean, dust-free, pollen and reduces energy losses thanks to a heat recovery able to capture, through A heat exchange, up to 90% of the heat from the air extracted.
With this system the air after exchanging the heat inside the recuperator crosses the post-treatment battery in which, depending on the season, is heated or cooled and dehumidified and then placed in the internal environment thanks to a Capillary distribution of ducts and terminals. Depending on the air flow, the external air conditions and the water temperature supplied will vary the power from the battery. Thanks to this system is ensured the constant change of air with consequent elimination of odors, water vapour and other pollutants of indoor environments, controlling both temperature and humidity.
From the point of view of the management (Domotic plant), the Nzeb building, has high standards of control of the internal climate and of the electric energy selfproduced through the photovoltaic panels.