In this case it becomes very important to understand that what exactly zero energy building means. Basically zero energy building has been classified under two sections, namely :–
1. Stand Alone Zero Energy Buildings
Stand Alone Zero Energy Buildings basically refers to those buildings which have been designed in such a way that it will be able to meet all of its energy requirements, without interaction of the grid and depending only on the renewable sources of energy. These types of zero energy buildings are better for remote areas where electricity is not frequently available. These are designed for the peak load value of the house which requires a good enough investment.
But, the basic deficiency which follows these types of building is the wastage of energy as it is designed for the maximum load of the house.
Area under blue shade is the magnitude of energy production while under red shade is the energy consumed.Therefore, energy-waste will be given by the difference of these two areas under curve. This means, in the given case, building’s efficiency will be ≤1 under any circumstances.