Net Zero Energy building, also called Net Zero Carbon building is an attempt to reduce the electrical bill to zero cost every year. There are about four definitions of Net Zero Energy Building (NZEB) by the National Renewable Energy Laboratory (NREL), USA.
•Net Zero Energy Cost Building: The electric bill is covered every year by virtue of design and production of energy at the site.
•Net Zero Energy Emission Building: The energy emission is measured in mass of carbon- equivalent greenhouse gas emissions related to energy use in the building. The quantity of energy emission factor is applied to the site energy use for each energy source or fuel used for the project.
•Net Zero Source Energy Building: A building that purchases or produces as much energy for a year by accounting the energy produced at the source.
•Net Zero Site Energy Building: A building that produces at least as much renewable energy as it uses the energy, over the course of a year.
When we speak of (NZEB), there is a general misconception that solar panels are used to produce all the energy required or others pre-conceive that there is a major reduction on the consumption of energy. In fact, this misnomer, to depend entirely on photo voltaic panels entirely, is not true as the cost of photo voltaic panels can be more than the building cost and the amount of consumption is also not reduced.
There are much fears that Net Zero Energy is exclusively for small buildings and System Design Architect is committed to pioneer this latest technology in the frontiers of Energy Efficient buildings. The need to save energy is an application of a want to improve the reduction of energy. The world that is groping, floundering and flirting with the Green movement as a way to save the world without substantial scientific basis, Net Zero Energy movement has a direct saving impact to the environment by reducing energy, carbon emission etc. The Green movement reduces a nominal energy consumption but in NZEB, the energy savings are drastically reduced by 100%.
Net Zero Energy movement has a direct saving impact to the environment by reducing energy, carbon emission etc. The Green movement reduces a nominal energy consumption but in NZEB, the energy savings are drastically reduced by 100%.
How does NZEB works
The methodology to produce NZEB is basically centered around reduce, reuse and recycle. The wastages are systematically reduced either passively or actively. Recycling of energy is done by placing equipment such as recycling wheel which is reused again. It should be noted that in nature there is no wastages. Wastage from one is a food source to another in the ecological food chain, unlike the case with human beings.
With the latest computer energy simulations, in the software, we will be able to identify the sources of energy consuming elements and eliminate them at the preliminary stages. Using a shoe box model with soft-wares as Ecotect, Vasari, Design studio, Therm and other personally developed software instantly reveals the weakness of areas where energy guzzling is identified and eliminated. Each of these software will serve a purpose.
By using passive design consideration techniques, the total heat gain (tropical heat /summer) or loss (winters) reduced. The orientation of the building will realise heat savings by 15%. Other passive strategies are window shading, glass curtain walls, shading of building from the sun using smart landscaping and insulation of the buildings. Using software that calculates the material to be used for insulation, minimises the loss of energy via conduction, convention and radiation. This will systematically be analysed and energy saved.