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The Energy class: the nZEB arrives

Posted by linda on 28 June 2018
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Nearly Zero Energy Building (nZEB) buildings are buildings that consume very little energy for cooling, heating, hot water production and lighting.

By 10 March 2020, new rules for the efficiency and energy performance of buildings will come into force both in Italy and in other countries.

This new directive requires European countries to implement a long-term strategy so as to support the renovation of residential and non-residential buildings, in order to obtain a highly energy-efficient building stock by 2050.

Nearly Zero Energy buildings

The concept of “nearby Zero Energy Building” was introduced by Directive 2010/31 / EU, which established that by 31 December 2020 all new buildings will have to be nZEB.

In Italy the definition that it acquired was that of “almost zero energy building” and established that by 31 December 2020 all new buildings will have to be almost zero energy.

What is the definition of nZEB?

The National Law defines it as follows:

“Building with very high energy performance […] whose very low or nearly zero energy needs are significantly covered by energy from renewable sources, produced in situ”

What are the main consumption in a building?

  • heating
  • cooling
  • production of domestic hot water
  • electricity required for lighting and home appliances
  • ventilation for air exchange

What are the characteristics that allow a building to reach the nZEB level?

A nZEB building must be well isolated, use solar inputs, minimize the use of mechanical systems and exploit the production from renewable sources.

  1. The principles of sustainable and bioclimatic design will be followed.
  2. The building must be oriented so as to optimize the influence of the Sun.
  3. The building envelope must be very insulated and shaded to avoid both heat loss and overheating
  4. The systems will have to operate at low temperature
  5. Renewable energy production plants will be installed (such as photovoltaic and solar thermal)
  6. Energy consumption will be monitored constantly

On average, considering the existing building stock, the consumption for heating and hot water varies between 200 and 400 kWh / sqm for year, with great savings and in addition the nZEB buildings should reach a much lower level of energy reaching at least 30 kWh / sqm for year.

Summary
Article Name
The Energy class: the nZEB arrives
Description
Nearly Zero Energy Building (nZEB) buildings are buildings that consume very little energy for cooling, heating, hot water production and lighting.
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