94390909-high-performance-building-in-composite-climate.pdf
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Transcript of 94390909-high-performance-building-in-composite-climate.pdf
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CONTENT
INTRODUCTION
OBJECTIVE OF THE STUDY
SCOPE OF STUDY
WORK DONE
LITERATURE REVIEW
FUTURISTIC USE OF STUDY
PROPOSED METHODOLOGY
REFERENCES
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What is Green Building?
Green building is the practice of increasing the efficiency of buildings and their use of energy, water, and materials, and reducing building impacts on human health and the environment, through better siting, design, construction, operation, maintenance, and removal taking into account every aspect of the complete building life cycle.
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Most characteristics of the composite zone
are similar to that of the hot and dry climate
zone, except that composite regions
experience higher humidity levels during
monsoons. In this type of climate two seasons
occur normally. Approximately two-thirds of
the year is hot-dry and the other third is warm-
humid. Localities further north and south often
have a third season,best described as cool-
dry.
In India most of the region comes
under two types of climate that is
composite and hot and dry
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HIGH PERFORMANCE BUILDINGS
HIGH PERFORMANCE BUILDINGS
DEFINITION OF HIGH PERFORMANCE
BUILDINGS. In this section, the term high performance building means a building that
integrates and optimizes all major high-
performance building attributes, including
energy efficiency, durability, life-cycle
performance, and occupant productivity.
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Orientation
Orientation: NE, SW This helps in receiving less radiation which results in lesser heat gains and reduced the overall air-conditioning requirement and hence saves energy. Proper orientation also helps in receiving natural light and ventilation
APPROPRIATE HEIGHT AND RECESSED WINDOWS Minimum height above the ground level to limit exposure to external conditions. Recessed windows to reduce external solar heat gains.
Water Body
USE OF WATERBODIES FOR EVAPORATIVE COOLING
Fountain to flow over extensive surfaces to maximize evaporation. Water evaporation has a cooling effect in the surroundings.
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POSITION OF OPENINGS In buildings air movements must be ensured through the space mostly used by occupants: through the living zone(up to 2m high).
SIZE OF OPENINGS The largest air velocity will be obtained through a small inlet opening with a large outlet. The best arrangement is full wall openings on both the sides , with adjustable sashes or closing devices which can assist in channelling the air flow in the required direction , following the change of wind. CONTROLS OF OPENINGS A gap left between the building face and canopy would ensure a downward pressure ,thus a flow is directed into the living zone.
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Deciduous plants can serve a useful purpose.
TREATMENT TO THE EXTERNAL SPACES
Large projecting eaves and wide verandahs are needed in composite climate as out-door living areas, to reduce sky glare, keep out the rain and provide shade.
Brise-soleils, louvers and other sun breaks used to protect openings during the hot-dry periods ,are also advantageous in the rainy season, serving as protection against dust and thermal winds.
A courtyard is the most pleasant out-door spaces for most of the year, because it excludes the winds and traps the sun. It should be designed in such a way so as to allow sun penetration during the winter months, but provides shading in the hot season.
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The U-value which is much higher incase of normal glass increases the solar heat gain and the energy consumption
WALL WITHOUT INSULATION
WALL WITH INSULATION
Insulation helps retain cool in summer and heat in winter, and acts as sound proof. This can create a major impact on indoor thermal comfort of the building.
Insulation Insulation is very important in green construction because it helps conserve energy.
In the past, ASBESTOS was used for insulation, but it has since been banned or restricted in many countries because of health hazards.
Good sustainable choices for insulation are those made from recycled newspaper and wood
pulp, soy, cotton, recycled plastic or cork.
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Roofing An important feature of green roofing
is its durability; sustainability can often
be as simple as avoiding or limiting
waste. Composite cedar shingles
resist moisture, mildew and insects,
which extends their life.
Metal roofing materials that have solar
reflective qualities also have
advantages, especially in hot
climates.
Glass Windows constructed of layered panes separated by sealed, gas-filled compartments
provide insulation that conserves energy. windows and doors can also be covered in
special low-emissivity coatings that use or block natural solar rays to help regulate
indoor temperatures.
Properly designed roof gardens help to
reduce heat
loads in a building
Landscaping
Landscaping is an important element in altering the microclimate of a place.
Proper landscaping reduces direct sun from striking and heating up of building
surfaces. It prevents reflected light carrying heat into a building from the
ground or other surfaces.
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USE OF ECO-FRIENDLY MATERIALS Eco friendly materials are describe as :a product that has been designed to the least possible damage to the environment.
Why eco friendly materials? Phenomenal growth in the construction industry that depends upon depletable resources. Production of building materials lead to irreversible environmental impact.
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ENERGY CONSERVATION
USE OF
RENEWABLE
SOURCE OF
ENERGY
Use of
appliances
that consume
less energy
Planting trees helps in
maintaining ecological
balance thus reducing
energy consumption
Use of
water
bodies for
evaporative
cooling
Use of
reflective
surfaces
for
minimum
heat gain
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Use of Passive means rather than active means
Traditional Jharokha in Jaipur, Rajasthan
provides light, & ventilation while avoiding
dust and glare
Passive design strategies Indirect cooling includes ventilation and stack effect and
venture effect, belvedere, roof pond, earth air tunnel, courtyards and Malkaafs, wind
scoops and wind towers.
ROOF POND
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Evaporative cooling systems uses evaporation as a cooling method in cooling the
surrounding air by adding moisture in the air hence increasing humidity. It is a low energy
passive system. The following sections are categorized into sections stating the required
conditions, implementation considerations and other issues. Case studies are listed as
reference to discuss on how these systems are implemented and the implication they
have on architecture design.
PASSIVE DOWNDRAFT EVAPORATIVE COOLING
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WATER RESOURCE MANAGEMENT Reducing water consumption and protecting water quality are key objectives in sustainable building.
One critical issue of water consumption is that in many areas, the demands on the supplying aquifer exceed its ability to replenish itself.
To the maximum extent feasible, facilities should increase their dependence on water that is collected, used, purified, and reused on-
site.
The protection and conservation of water throughout the life of a building may be accomplished by designing for dual plumbing that
recycles water in toilet flushing
WASTE REDUCTION
Green architecture also seeks to reduce waste of energy, water and materials used during construction.
During the construction phase, one goal should be to reduce the amount of material going to landfills.
Well-designed buildings also help reduce the amount of waste generated by the occupants as well, by providing on-site solutions
such as compost bins to reduce matter going to landfills.
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Use of locally available materials and sustainable energy sources have been used extensively in the building. Natural lighting and ventilation enhance the energy-efficiency of the building. Adequate green spaces help in controlling the micro-climate providing visual delight at the same time.
Aerial view of CII-Godrej GBC, Hyderabad showing wind towers, solar photovoltaic panels and
green roofs.
CII-Godrej GBC, Hyderabad
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Architectural Design The building is designed to maximize usage of natural light for day-lighting without getting unwanted heat inside. The ground surface covered by the building is replaced through roof gardens which play a major role in insulating the building.
Unwanted gain of heat is reduced through simple design principles like earth berming. Heat gain through openings is also reduced through intelligent design of windows.
Roof gardens insulate the building from solar heat
An effective combination of closed and open spaces help in modulating the micro-climate so that it keeps the building cool and well-ventilated. There is ease of access throughout the site.
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PHOTOVOLTAIC PANELS
Solar energy is used to generate electricity that is used in the building.
Solar photovoltaic panels on the roof generate electricity for the building
Wind towers Wind towers carry air through an earth air tunnel to cool it before being supplied to the AHUs.
Jaalis on the outer faade of the building also help in cooling, shading and ventilation of the building.
Use of Renewable source of Energy
Effective measures are taken to properly ventilate the building while saving energy at the same time. Air caught by the wind towers is carried through an earth-air tunnel which pre- cools the air entering into the AHUs. This saves energy required in the cooling process.
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Day lighting
Emphasis is laid on providing adequate day-lighting.
Intelligent design of windows such as different windows for views and for light reduce the heat gain.
Materials & Appliances Use of local materials and materials with is visible at various places. For instance, local stone and waste construction materials are used for external cladding. low-embodied energy
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There is a vast difference in the amount of glazed areas on the northern and western sides of the building. Such features
prevent unwanted heat gain.
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Futuristic use of study
With increasing population human needs are also increasing day
by day which has resulted in various ecological problems. Now a
days with advancement in technology there is increase in basic
needs of people and there is no more the time when people
required only three things for living that is roti, kapda or makan they dont want normal roti nor normal kapda and neither makan. People now a days are more addicted to active means which has
resulted in more and more consumption and thus disturbing
ecological balance. An ideal citizens duty is to not only think about his generation but also for future and thus there isv a great need
of buildings which are dependent mostly on passive means and
studying this topic makes us aware of the methods by which we
can create an environment which is eco-friendly.
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Two types of windows designed: peep windows for possible cross ventilation
and view, the other being for day lighting
Shading by vegetation (trees and creepers)
cooling through evaporation by water surfaces and plants (except
during monsoon)
cooling through earth tunnel system
EARTH TUNNEL SYSTEM
COURTYARD
IMPLIMENTATION IN DESIGN
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Literature survey about composite climate and scope of this topic in India
Literature survey on high performance buildings in composite climate
Compared those elements with live examples like retreat
Implemented those ideas in design project done in previous semester