
TRANSFORMING CONSTRUCTION IN FAVOR OF THE ENVIRONMENT
Written by: Ing. Raul Mora Alvarado
We can say that a zero energy building is a building with a high level of energy efficiency where the little amount of energy required must come from renewable energy sources, so that its energy balance is zero or almost zero.


Achieving zero energy is an ambitious goal that is increasingly achievable and of great importance worldwide, both government institutions and the private sector are moving towards the implementation of Zero Energy Buildings. A Zero Energy Building produces enough renewable energy to meet its own annual energy consumption, reducing the use of non-renewable energy.

On the one hand, active systems to achieve electricity and air conditioning based on renewable energies offer several possibilities, such as solar panels, wind turbines, biofuels, biomass or hydrogen-based fuel cells. For example, a building that only incorporates photovoltaic solar panels can achieve a reduction of its energy needs between 15% and 30%.
On the other hand, passive techniques, such as thermal insulation or the use of solar or even metabolic heat, generated by its occupants, can reduce the energy consumption for air conditioning the building by between 70% and 90% unnecessarily of electricity generation systems.
Therefore, before starting a construction, the designers of these ecological buildings use sophisticated 3D simulation computer tools to incorporate, in the best possible way, aspects such as the location and its orientation, the local climate, the materials used, the thermal insulation , lighting, or the efficiency of electrical and air conditioning elements. In these types of buildings, environmental consultants or bioclimatic experts are an important part of the architectural project.
The UK has taken the implementation of this type of green housing very seriously. In December 2006, the government announced that by 2016 all newly built houses must be zero energy. In that sense, the British standards that currently regulate this sector do not require building following these principles, but they will be increasingly strict in the next nine years, in line with the Code for Sustainable Houses, so that it can be achieve the stated objective.
Germany is one of the country’s most aware of the sustainability of housing. The standards of the German “Passivhaus” have been a world reference for years, elaborated with modern technologies of passive energy efficient systems. Also, some of its designers show that they are at the forefront of these technologies. In the international “Solar Decathlon” competition, promoted by the US Department of Energy, a Green House design from Darmstadt University of Technology won first prize.
Outside the European Union, the United States is another of the international benchmarks in this type of sustainable construction. In 1999, the Florida Solar Energy Research Center laid the foundations for programs such as “Zero Energy Home” or the “Building America” of the US Department of Energy (DEO). Likewise, the various research laboratories throughout the country work on sustainable building research programs. In this sense, the DEO has announced various plans with large sums of money to invest in this type of project.
However, the construction of Zero Energy Buildings also poses a series of disadvantages that must be taken into account. One of its main disadvantages is that the use of these technologies, especially the installation of renewable energy sources, usually implies higher initial construction costs compared to conventional buildings. The medium-term prospects is for this type of technology to become widespread and improve, reducing its costs, something that may be an advantage for this type of housing in the future.
1.- National Renewable Energy Laboratory _ Accelerating to Zero Energy District
2.- Eco Inteligencia _ ¿Que es un Edificio de Energía Zero?
3.- US Department of Energy _ A Common Definition for Zero Energy Building
4.- ASHRAE _ Achieving Zero Energy
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