Concept of Energy Efficiency

8/16/2019 Concept of Energy Efficiency

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Concept of Energy Eciency


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Buildings, as they are designed and used,contribute to serious environmental problemsbecause of excessive consumption of energy &other natural resources.

The global energy scenario has undergone a drasticchange in the last two decades. t is estimated that

almost !"#rd of the global energy demand is due tobuildings, as their construction, operation andmaintenance are concerned and is expected to growby an additional $% percent by !!%.

The present day buildings that are designed andused, symboli'e un(restrained consumption ofenergy, be it a )ve start hotel, commercialestablishment, govt buildings or a residencecomplex.


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Commercial and residential buildings accountfor more than 30 percent of the electricity

consumption in India. We add more than 40million sq. m of commercial and residentialspace annually and this results in theadditional burden of 5.6 billion units ofelectricity.

n this scenario introduction of energy ecientbuilding design concept has become critical forachieving the collective ob*ectives of energy

security and environmental protection, which inturn can ensure economic and social development.


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Energy resource eciency in new constructions canbe e+ected by adopting an integrated approach tobuilding design.

The primary steps in this approach would be to• ncorporate solar passive techni-ues in buildingdesign to minimi'e load on conventional systemsheating, cooling, ventilation and lighting/.•

0esign energy ecient lighting and 123Csystems.• 4se renewable energy sources to meet part ofbuilding load. 4se low energy materials & methods of

construction & reduce transportation energy.

Thus in brief, an energy ecient building balancesall aspects of energy use in a building lighting,

space(conditioning and ventilation, by providing an


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The tas of an !rchitect

3rchitects can achieve energy eciency in the

buildings they design by studying the macro(andmicro(climate of the site, applying bioclimaticarchitectural principles. 5ome common designelements that a+ect the thermal conditions are

1.Orientation: The placement of the building innorth(south direction, reduces the heat energy inputin the building, increases overall ventilation andprovide thermal comfort to the building .2.Landscaping: 6andscaping alters the

microclimate of the site. t reduces direct sun fromstri7ng the building & heating up the buildingsurfaces.3.Materials of construction: Choice of building

materials is very important in reducing the energy


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$. Location of water bodies: 8ater is a verygood modi)er of microclimate. t ta7es up large

amount of heat in evaporation and causessigni)cant cooling in hot and dry climate. 9n theother hand,in humid climates, water should beavoided as it adds to humidity.

%. Building form/surface to volume ratio: Thevolume of space inside a building that needs to beheated or cooled and its relationship with the area ofthe envelope enclosing the volume a+ects thethermal performance of the building. :or any givenbuilding volume, the more compact the shape, theless wasteful it is in gaining" losing heat.3lso, the building form determines the air;owpattern a round the building, directly a+ecting its

ventilation.


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"ome ey energy sa#ing measures$• 9rient the building to have maximum exposure &maximum gla'ing along north and south facades.• s, T(%;uorescent lamps, electronic cho7es, can be used toreduce consumption.


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• 1igh eciency chilling systems along withappropriate controls should be used.• 0evices such as heat recovery units, economi'er

controls, should be explored.• ?assive conditioning strategies such as earthembedded cooling systems, thermal storagesystems etc., can also be explored to reducedemand on conventional air conditioning.

By the application of these techni-ues , the energy

consumption and demand would come down, whichis good for people, society, nation and our world.

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Concept of Energy Efficiency