amount of energy used is equal to amount of renewable energy created on the site reduce carbon emissions & reduce dependence on fossil fuels Buildings that produce a surplus of energy over the year are called “Energy Surplus Buildings” During the last 20 years more than 200 reputable projects claiming net zero energy balance have been realized all over the world. NZEB buildings consequently contribute less overall greenhouse gas to the atmosphere than similar non-ZNE buildings. They do at times consume non-renewable energy and produce greenhouse gases, but at other times reduce energy consumption and greenhouse gas production elsewhere by the same amount. Traditional buildings consume 40% of the total fossil fuel energy in all over the world and are significant contributors of greenhouse gases.

1. NET ZERO ENERGY BUILDING (NZEB)
Presented By: Abdur Rasheed, Abu Huraira & Mohd Khalid Raza

2. • amount of energy used is equal to amount of renewable energy created on
the site
• reduce carbon emissions & reduce dependence on fossil fuels
• Buildings that produce a surplus of energy over the year are called “Energy
Surplus Buildings”
• During the last 20 years more than 200 reputable projects claiming net zero
energy balance have been realized all over the world.
• NZEB buildings consequently contribute less overall greenhouse gas to the
atmosphere than similar non-ZNE buildings. They do at times consume non-
renewable energy and produce greenhouse gases, but at other times reduce
energy consumption and greenhouse gas production elsewhere by the same
amount. Traditional buildings consume 40% of the total fossil fuel energy in all
over the world and are significant contributors of greenhouse gases.
Net Zero Energy Building

3. For the discussion of ZEB definitions literature can be divided into a number of main important
topics
1. Energy focus
Total energy demand in the building is a sum of thermal and electricity demand; however,
many studies focus only on one demand neglecting the other. This issue is raised by Able,
(1994): “Many low-energy building projects seem to have been based on the idea 'decrease
heat supply at any cost'. In some cases, this has resulted in 'zero-energy buildings' which, it is
true, do not need any heat supply but do, instead, indirectly need electricity, e.g., to operate
the heat pump included in the system.”
2 . Energy Supply system
The scientific publications focus either on off-grid ZEBs or on-grid ZEB. The main difference
between those two approaches is that, the off-grid ZEB does not have any connection to the
energy infrastructure, thus it does not purchase energy from any external sources, and the
boundaries for the balance calculations are within the building. The on-grid ZEB, in the
literature also named “net zero” or “grid connected”, is the energy producing building
connected to one or more energy infrastructures; electricity grid, district heating and cooling
system, gas pipe network, biomass and bio fuels distribution networks. Therefore, it is has a
possibility for both buying and selling energy from/to the utility grid. This division is also well
noticeable in the ZEB definitions.

4. 3. Renewable energy options
• In a ZEB, it is necessary to define the supply-side of the renewable energy sources.
• There are two options: on-site supply or off-site supply.
• Within the on-site supply authors distinguish building footprint and building site.
• Within the off-site supply the building either uses RES available off-site to produce
energy on-site, or purchase off-site RES.

5. Total Energy consumption diagram

6. NZEB CONCEPTS
• Net Zero Site Energy
• Net Zero Source Energy
• Net Zero Energy Costs
• Net Zero Energy Emissions

12. WHY NZEB
• Reduces Energy Consumption
• Reduces Green House Gases (Carbon Emissions) & Global Warming
• Reduces Dependence on Fossil Fuels
• Reduces Ozone Depletion
• Reduces Climate Change
• Protects Our Environment for Future Generations

13. Strat
Energy demand
Load demand
Air flow
simulation
Colling load
Renewable
sources
identification
Economical and
environmental
benefits
Maintenance
Reneweable
resources
Climate analysis
Methodology

14. Process of construction

15. Design Methodology
• Construction & lab experiments are
costly
• Computer Simulations are
convenient & quick
• Very low cost
• EnergyPlus and TRNSYS 16.0 are used
• EnergyPlus models hourly energy
consumption
• TRNSYS is widely applied for both
energy efficiency and renewable
energy analyses
• EnergyPlus simulations are used for
building envelope design
• TRANSYS is used for building systems
and renewable energy systems
design
Weather Data Analysis
Primary step
•Wind frequency profile

16. ZERO ENERGY STRATEGIES & COMPONENTS

18. Case Study: The Indira Paryavaran Bhavan.
• India’s first net zero energy building
• solar passive design and energy-efficient building materials.
• earthquake-resistant structure with a total plinth area of 31,488 sq. m.
• More than 50 per cent area outside the building is a soft area with plantation and
grass.

19. • The building has a robotic parking system in the basement that can accommodate 330
cars.
• Thin-client networking system has been provided instead of conventional desktop
computers to minimise energy consumption.
• Design allows for 75% of natural daylight to be utilised to reduce energy consumption.
• Installed capacity of 930 kW peak power, the building has the largest rooftop solar
system among multi-storied buildings in India.
• Union environment minister Prakash Javadekar showcased the building to United
Nations secretary general Ban Ki-moon on 13/1/15
• Total energy savings of about 40 per cent through the adoption of energy efficient
chilled beam system of air-conditioning
• Air-conditioning is done by convection currents rather than airflow through air handling
units, and chilled water is circulated right up to the diffuser points unlike the
conventional systems.
• UPVC windows with hermetically sealed double glass. Calcium Silicate ceiling tiles with
high recyclable content and grass paver blocks on pavements and roads, renewable
bamboo jute for door-frame, fly ash bricks
• Reduction in water consumption has been achieved by use of low-discharge water
fixtures, recycling of waste water through sewage treatment plant, use of plants with
low water demand in landscaping, use of geothermal cooling for HVAC system,
rainwater harvesting and use of curing compounds during construction.

20. • Preservation of maximum possible number of trees standing over the site
• Solar Passive Architecture with proper orientation and shading of
Fenestrations
• Appropriate building envelope design with envelope insulation to reduce
heat intake
• Use of permanent, durable and local materials such as sand stone on
exterior face, low heat transmission glass and reflective roofing
• Priority for pedestrians in the front, with vehicular access on the sides of
the building
• Reduction of conventional lighting load by ensuring 75% day-light use
• Natural ventilation due to stack effect
• The building is designed in such a way that there is free ventilation across
the entire building
Architectural design of the building is primarily based on
following concepts

21. • Utilization of High Efficiency Solar Panels to achieve Net Zero criteria
• Energy efficient T-5 and LED fixtures
• Innovative chilled beam system for cooling
• Pre-cooling of fresh air from exhaust using heat recovery wheel in order to
reduce load on chiller plant
• Water cooled chillers
• Double skin air handling units with variable frequency drives
• Geo thermal heat exchange technology used for heat rejection from Air-
conditioning system
• Innovative energy saving regenerative lifts which have been installed for the first
time in government institutional building
Energy Conservation Measures:

22. Conclusion
•With the advancement in renewable technology, Net Zero Energy Buildings
are the future.
•Many governments have framed Zero Energy building laws.
•Few governments are also providing subsidies to individuals and
organizations for creating Zero Energy Buildings.
•The goal of zero energy buildings would not be fulfilled till the time all the
people don’t understand their responsibility and contribute towards reducing
energy consumption.
• Solar and Wind energy will be the major contributor of renewable energy for
ZEB’s owing to their widespread availability.
• Biogas can also be used for our energy needs but its only constraint is that it
needs huge quantity of waste and it is also not feasible everywhere.
• Geothermal energy is an upcoming form of energy having great potential to
generate electricity but a lot of research still has to be done to tap into its full
potential.

23. THANKS