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8/12/2019 Lecture 2 EEA- SAP, Chennai
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School of Architecture and Planning, Anna University Campus, Chennai
AD9022 ENERGY EFFICIENT ARCHITECTURE
RENEWABLE SOURCESOF ENERGY
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The world has reached peak conventional oil and gas, meaning oil and gas
companies are digging deeper and deeper into unconventional sources, with
disastrous environmental and social consequences.
Minimizing climate change impacts will require substantial cuts in global
emissions - as quickly as possible.
Coal is still relatively readily available, but catastrophic in terms of climate
changing emissions. The world can no longer afford to hang on to its old energy
paradigm, and its dangerous dependence on fossil fuels.
The pressure on the earths nonrenewable resources can be alleviated by
judicious use of earths renewable resources.
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The use of renewable energy in buildings has increased significantly recently due
to a number of other factors:
1.Increased fuel costs.
2.Reduced costs of renewable energy.
3.Increased interest in reducing building carbon footprints.
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A large variety of renewable energy systems, including the following:
Solar thermal panels
Photovoltaic panels
Wind turbines (large and small scale)
Bio gas and Biomass.
Tidal power.
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Which renewable
option is best for
my building?
Depends on the
size of thebuilding, energy
use, building
location, and
operational time.
And most
importantly
payback period.
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Before considering the use of renewable energy, one should examine how
buildings energy demand can be reduced through clever and often innovative
design techniques.
This includes passive building design techniques.(many of which add little or
no additional cost to buildings and are therefore of particularly high value toclients) review heating and electrical supply options.(including the use of
renewable energy)
This provides clients with the options available and assists in selecting the most
appropriate energy source for their development.
Actively encourage clients to procure low energy buildings and to include
renewable systems as a part of a detailed and integrated low energy strategy.
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Policies and programs promoting energy efficiency & renewable energyIntegration in Buildings in India.
The government through Ministry of New and Renewable Energy (MNRE) has
incentives the use of renewable energy technologies (RETs) in buildings through
Subsidies and other fiscal incentives such as tax holidays, accelerated
depreciation rates etc.
MNRE has started a solar cities program to promote the use of solar energy.
Energy Conservation Building Codes (ECBC) have also been developed to
propagate the practice of designing energy efficient buildings.
Though these codes are voluntary till now, their implementation has provided
a strong base for further energy efficiency measures in future.
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Solar thermal panels
Solar hot water systems gather energy from solar radiation and turn it into heat
that is then distributed in the form of hot air or water to where it is to be used or
stored until needed.
An active solar water heater consists of a solar collector(s), a hot water storage
tank(s), and a pump.
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In addition, a heat exchanger and expansion tank are required in freezing winterclimates and an electrical generation device is needed if regular AC grid-
connected power is not available.
Piping, insulation, valves and fittings are considered installation materials and
are normally available at hardware stores and plumbing centres.
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A solar collector consists of a translucent cover, an absorption plate and a heat
transfer system, involving hot water pipes or hot air.
A good liquid solar collector should have a minimum life expectancy of 2030
years.
Most of the collectors built since about 1980 are manufactured with materials
that should give a 3050 year lifespan with a small amount of periodic
maintenance.
Good liquid collectors typically have copper water ways (piping and
tubing), a tempered glass cover and an insulated metal enclosure.
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Although a little of the radiation falling on the translucent cover will be re-
reflected away, most will pass through and be absorbed by the absorption plate
and heat the water contained in it.
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WHY USE A SOLAR HOT WATER SYSTEM?
All Eco buildings should use solar energy to heat their water if possible.
This is because solar hot water systems (SHWS) are not only easy to build or buyand install but, above all, they use the free, clean energy of the sun.
HOW GREEN IS A SHWS?
The domestic sector is responsible for around 30 per cent of the carbonemissions of developed countries, mainly owing to the CO2 emitted as a by-
product of power generation and fossil fuel burning. Of this 30 per cent, 25 per
cent goes to heating water for use from the taps and to provide pre-heating for
space heating systems.
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PHOTOVOLTAICS
Photovoltaic cells convert sunlight directly into electrical
energy.
The electricity they produce is DC (direct current) and caneither be:
used directly as DC power;
converted to AC (alternating current) power; orstored for later use.
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The basic element of a photovoltaic system is the solar cellthat is made of a semiconductor material, typically silicon.
There are no moving parts in a solar cell, its operation is
environmentally benign and, if the device is correctly
encapsulated against the environment, there is nothing that
will wear out.
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Because sunlight is universally available, photovoltaicdevices have many additional benefits that make them not
only usable, but of great value us. They are the future and by
2020, when the conventional oil supplies begin to really dry
up, they will be everywhere.
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CROSS-SECTION OF A TYPICAL PV SOLAR SECTION
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WHAT IS A PV SYSTEM?
PV cells are typically grouped together in a module for ease of
use.
A PV system consists of one or more PV modules, which convert
sunlight directly into electricity, and a range of other system
components that may include an AC/DC inverter, back-up
source of energy, battery to store the electricity until it is needed,
battery charger, control centre, mounting structures andmiscellaneous wires and fuses.
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WHATS GREEN ABOUT PV?
The electricity produced by every square metre of PV can
effectively displace emissions of more than two tonnes of CO2 to
the atmosphere over its lifetime.
Counters impacts of buildings that are responsible for generating
over 50 per cent of all emissions of greenhouse gases globally.
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ADVANTAGES OF PHOTOVOLTAICS AS A DOMESTICSOURCE OF ENERGY
They are low maintenance.
Once installed they will simply require their surfaces cleaning, especially industy environments.
They can provide power in locations remote from the grid.
PVs are a transportable technology and can be moved betweenbuildings.
They can provide power during blackouts.
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WIND TURBINES
Wind energy has been used for pumping water and milling
grain for hundreds of years.
More recently, wind energy has also been used for electricitygeneration.
Developing countries can take advantage of wind power on a
small scale, both for irrigation (wind pumps) and forgeneration of electricity (wind generators).
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WIND TURBINES
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WIND TURBINES
Small wind turbine systems, with a capacity ranging from 50
W to 10 kW and rotor diameter ranging from about 0.5 m to 7
m, are primarily used in battery charging.
The batteries can then be used for energy supply for houses,
hospitals, farms, telecommunication, navigation, etc. Wind
energy systems can also operate in parallel with diesel sets
or solar PV systems.
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WIND TURBINES
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COST, SAVINGS AND EARNINGS
Maintenance checks are necessary every few years, and will generally cost
around Rs.7000 to Rs. 14000 per year depending on turbine size.
A well-maintained turbine should last more than 20 years, but you may needto replace the inverter at some stage during this time, at a cost of ,Rs. 70,000
to Rs. 1,40,000 for a large system.
Savings:
Building-mounted turbines tend to produce less electricity per kW than pole-
mounted ones.
A well-sited 6kW turbine can generate around 10,000kWh per year equivalent
to around 5.2 tonnes of carbon dioxide a year generating income and savings.
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BIOMASS
Biomass is a renewable energy
resource derived from the
carbonaceous waste of various
human and natural activities.
It is derived from numerous sources,
including the by-products from the
timber industry, agricultural crops,raw material from the forest, major
parts of household waste and wood.
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BIOMASS
Biomass does not add carbon dioxide to the atmosphere as it
absorbs the same amount of carbon in growing as it releases
when consumed as a fuel.
Its advantage is that it can be used to generate electricity with
the same equipment or power plants that are now burning
fossil fuels.
Biomass is an important source of energy and the most
important fuel worldwide after coal, oil and natural gas.
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BIOMASS
Biomass fuels used in India account for about one third of the
total fuel used in the country, being the most important fuel used
in over 90% of the rural households and about 15% of the urban
households.
Advantages of biomass energy as an alternative energy source,
as it is renewable and free from net CO2 (carbon dioxide)
emissions, and is abundantly available on earth in the form of
agricultural residue, city garbage, cattle dung, firewood, etc.
Bio-energy, in the form of biogas,
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Geothermal energyis thermal energy generated and stored inthe Earth.
Thermal energy is the energy that determines the temperature of
matter.
The Geothermal energy of the Earth's crust originates from the
original formation of the planet (20%) and from radioactive
decay of minerals (80%)..
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70% comes from the decay of radioactive nuclei with longhalf lives that are embedded within the Earth
Some energy is from residual heat left over from Earths
formation.
The rest of the energy comes from meteorite impacts.
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space heating
air conditioning
industrial
processes drying
Greenhouses
Aquaculture
hot water
resorts and pools melting snow
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Direct Sources function
by sending water down a
well to be heated by the
Earths warmth.
Then a heat pump is
used to take the heat
from the underground
water to the substance
that heats the house.
Then after the water it is
cooled is injected back
into the Earth.
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Any Questions?
AD9022 ENERGY EFFICIENT ARCHITECTURE