1).What are zero energy buildings?
But more often low energy consuming buildings , buildings using renewable energy sources(most of the energy requirements) comes in thiscategory.
Here are few common definitions to define it according to the global customs.
Common definitions
1.) Net zero energy emissions.
2.) Net zero energy cost.
3.) Net zero site energy.
4.) Net zero primary energy use.
In any case, we can make energy use zero (in a complete cycle of energy use and purchase) if we go for grid system that is supplying energy to central grid when on-site production of energy is more than the utilization of energy , so that it can be used by others or it can be stored there on-site itself for future use.
The zero energy goal can be achieved by using any of the renewable energy source (not only GREEN ENERGY SOURCE!)
NET ZERO SITE ENERGY:
The energy produced at site is equal to the energy used by the same round a year.
NET ZERO ENERGY COST:
Net zero energy cost relates to the price of energy. In such a building, the cost of purchasing energy is balanced by income from sales of electricity to the grid of electricity generated on-site.
NET ZERO ENERGY EMISSION:
A net zero energy emission building produces as much energy from renewable sources of energy as it takes from energy source producing energy (off-site or on –site)from non renewable energy sources.
NET ZERO PRIMARY ENERGY USE:
The energy produced at the site using energy should be greater than required so that it can be exported to the grid.So that the energy waste(fossil fuel efficiency is less than 40%and there are looses in transmission loses) can be overcome.
