green buildings pebs

8/6/2019 Green Buildings Pebs

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GREEN PRE ENGINEERED

BUILDINGS

B y

D.V.L.VARDHAN


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INTRODUCTION:

The National Geographic Society in association with GlobeScan, an internationally reputed poll

firm developed the Greendex. It is a rating system that has been incorporated to gauge the extent of

impact that consumption patterns have on the environment. The survey was conducted in 17 countries

in 2009 and the results were quite interesting. The developing economies like India, Brazil and China had

topped the charts whereas the developed economies like US, Canada and Japan languished at the

bottom. In fact India was rated as the greenest country in the world.

Greendex Map of the World

The rating system depicts the shortfall in the standard of living in the developing economies and

the high emissions associated with life styles in the developed economies. The developing economies

will have to take a course where the economic outlook improves but not the emissions attached with it.

On the other hand developed economies have to focus on a lesser emission based consumption pattern.

Therefore the need of the hour is to look for concrete solutions that cater to the exigencies.

The measures that need to be taken should be wide ranging, encompassing several sectors like

energy, transportation, logistics, industries, commercial spaces etc. Moreover buildings are considered

to be the major source for emissions throughout their life cycle. Therefore a very pertinent paradigm of

green buildings has been evolved to negate the malignant effects associated with them.


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GREEN BUILDINGS

A Green Building, also known as a sustainable building, is a structure that is designed, built,

renovated, operated, or re-used in an ecological and resource efficient manner.

Objectives of a green building:

Protecting occupant health

Improving employee productivity

Using energy, water and other resources more efficiently

Reducing overall impact to the environment

Optimal environmental and economic performance

Satisfying and quality indoor spaces

CONSIDERATIONS FOR GREEN BUILDINGS

Control erosion to reduce negative impacts on water and air quality

Reduce pollution and land development impacts from automobile use

Limit disruption of natural water hydrology by reducing impervious cover, increasing on-site

infiltration and managing storm water run-off

Encourage and recognize increasing levels of self supply through renewable technologies to

reduce environmental impacts associated with fossil fuel energy use

Provide a high level of individual occupant control of ventilation and lighting systems to support

good health, better productivity and a comfortable atmosphere

Provide a connection between indoor spaces and outdoor environment through theintroduction of sunlight and views into the occupied areas of the building


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Parameters for a Green Building:

The following aspects of the building design are looked into in an integrated way in a green building:

Site planning

Building envelope design

Building system design HVAC(heating ventilation and air conditioning), lighting, electrical, and water

heating

Integration of renewable energy sources to generate energy onsite.

Water and waste management

Selection of ecologically sustainable materials (with high recycled content, rapidly renewable

resources with low emission potential, etc.).

Indoor environmental quality (maintains indoor thermal and visual comfort and air quality)

RATING SYSTEM FOR GREEN BUILDINGS

At present in India there are two rating systems,

LEED

GRIHA

LEED RATING SYSTEM:

Leadership in Energy and Environmental Design (LEED) is a rating system developed and

managed by the US Green Building Council (USGBC).

Buildings are rated as Platinum, Gold, Silver or Certified based on fulfillment of certain criteria.

The LEED rating system in US exists for various sectors like

New commercial construction

Major renovation projects

Existing building operation and maintenance

Homes

Schools Commercial Interiors

LEED ratings for health care and labs are on the anvil.


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INDIAN SCENARIO:

The Confederation of Indian Industries (CII) and Godrej group had collaborated to set up the

Indian Green Building Council at Hyderabad.

IGBC basically facilitates the LEED ratings of the USGBC in India. They were launched in 2001.

IGBC offers rating systems in the following formats

IGBC GREEN HOMES

IGBC GREEN FACTORY BUILDING

LEED INDIA FOR NEW CONSTRUCTION

LEED INDIA FOR CORE AND SHELL

IGBC GREEN FACTORY BUILDING RATING SYSTEM:

The principal idea behind conceptualizing such a rating system is to provide impetus for green

and sustainable factories.

Benefits

Reduction in usage of energy (30-40 %)

Reduction in usage of water resources (20-30 %)

Reduction in green house gas emissions

Better handling of waste products

Improvement in the productivity of workers

Improvement in the health and safety of workers.

The IGBC Green factory rating system caters to new factories and existing factories as well.

The IGBC Green factory rating system looks into the following parameters

Site Selection and Planning

Water Conservation

Energy Conservation

Material conservation

Indoor environment quality and occupational health

Innovation and design process


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LEAD INDIA NC

In India 20 % of the electricity is consumed by buildings. Urbanization has contributed towards this

cause. With economic progress the emissions associated with buildings are going to rise.

Thus IGBC has come up with LEED INDIA NC rating. It is for commercial, institutional and high rise

residential buildings. It tries to address issues like

Sustainable Sites

Water Efficiency

Energy & Atmosphere

Materials & Resources

Indoor Environment Quality

Innovation & Design Process

GRIHA RATING SYSTEM

GRIHA is an acronym for Green Rating for Integrated Habitat Assessment .

It is tool that has been developed by TERI and has been adopted by the Ministry of New and Renewable

Energy

GRIHA is a rating tool that helps people assesses the performance of their building against certain

nationally acceptable benchmarks.

It evaluates the environmental performance of a building holistically over its entire life cycle, thereby

providing a definitive standard for what constitutes a green building

POINT SYSTEM FOR GRIHA

Points scored Rating

50-60 One star

61-70 Two star

71-80 Three star

81-90 Four star

91-100 Five star


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POINTS FOR IGBC GREEN FACTORY CERTIFICATION LEVELS

Certified 51-60 Silver 61-70

Gold 71-80 Platinum 81-100


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GREEN PRE ENGINEERED BUILDINGS

Pre engineered buildings per se are environmentally benign to a certain degree. They negate the

usage of buildings materials that have considerable amount of emissions. For example in a typical PEBthe usage of cement and concrete is minimal when compared to a conventional building.

There are some innate features of a PEB which brings it close to being a green product. Some of them

are:

The principal building material that is used in a pre engineered building is steel. Steel has the

greatest advantage of being both recycled and recyclable

Pre engineered buildings are resource optimized. PEB structures are made using proprietary

software that optimizes the inputs. The precision thus obtained with the help of software can

save a lot of steel, thus reducing the costs.

The pre engineered buildings are light in weight compared to other buildings, thus making the

foundation more sustainable.

Special reflective materials and coatings can reduce the heat absorption capacity of the building.

For example Cool metal roofing has high reflectivity and the loss is minimal over its life.

Insulation in PEB can regulate the temperature inside the building, thus regulating the usage of

energy.

But in order to be rated as a green building emphasis has to be laid on several other aspects and better

packaging is also needed to be done in order to be certified by a rating agency.

Markets in India are not yet well verse in the practices that are followed for a typical green PEB. On the

other hand certain companies, especially in US seem to have done considerable amount of work in this

regard. Therefore in order to gain a perspective it would be pertinent to look at these companies to try

and understand the products and services they offer. The companies which are active in the field of

green PEB are Nucor, NCI etc.

NUCOR

Nucor is the largest steel recycler in the US. In 2008 Nucor recycled a quantity of scrap steel in excess of

20 million tons. Nucor's steel making processes are supposed to have lower emissions than integrated

steel making operations. Nucor's energy consumption per ton of steel produced is much lower than that

of integrated mills


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Nucor offers certain products and services which help the customer obtain LEED ratings for the building.

We should note that the LEED Rating System rates the aggregate system of the building and

individual components of the building do not, by themselves earn points

How Nucor facilitates LEED ratings

Recycled steel

Nucor buildings are made from recycled steel

Nucor uses Electric Arc Furnace technology at its steel recycling facilities.EAF use scrap steel as major

feedstock unlike blast furnaces that use mined ore.

Recycled Steel Content of Nucor Products

Nucor bar product 97.7 %

Nucor beam products 76.2 %

Nucor plate products 92.5%

Nucor sheet products 70.2 %

Total Nucor steel combined 89.7 %

Heat Island Effect

NBS offers two standard white (SP Polar White or Kynar Regal White) CFR finish options that exceed the LEED

Solar Reflectance Index (SRI) requirement of 78.

Use of Regional Materials

Nucor has several plant sites scattered in US. This facilitates use of regional materials, thus reducing the

shipment costs and associated emissions.

Recyclability

The steel that is used by Nucor are 100 % recyclable.


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Points Earned By Using Nucors Products

LEED Section * SubjectPotential

PointsNBS Contribution

MR Credit 4.1 & 4.2 Recycled Content 2 NBS Recycled Content over 89%

SS Credit 7.2 Heat Island Effect:

Roof

1 NBS Offers 2 roof paints with Solar

Reflectance Index (SRI) over 78

MR Credit 5.1 & 5.2 Use of Regional

Materials

2 NBS multiple plant locations and

Nucor domestic steel mills can oftencontribute to the use of regional

materials. This varies based on the job

site. The local plant will assist indetermining regional content

MR Credit 3.1 & 3.2 Materials Reuse 2 All NBS steel materials are 100%recyclable in the future.

NCI

LEED - POINT CHART

This chart presents some of the ways NCI Metal Building products can help you earn points toward

LEED Certification.

LEED-NC Metal Building Credit Guide

1

Name DescriptionNumber of

Points2 Reason

SS Credit5.1

Site Development:

Protect or RestoreHabitat

1 Being shop fabricated, NCI metal buildingsallow field assembly using a minimal workarea.

SS Credit7.1

Heat Island Effect:

Non-roof

Up to 2 (1 plus 1

ExemplaryPerformance

point4)

By deploying parking covers with NCI roof

products, 1 point is earned for 50% ofspaces covered, and an exemplary

performance point can be earned for100% of spaces covered.


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SS Credit7.2

Heat Island Effect:

Roof

1

Our Snow White, Ivory, Bone White, and

Solar White colors meet the low-sloperequirement and all NCI colors meet the

steep slope requirement of this credit.

EA Credit 1Optimize EnergyPerformance

Up to 10

By utilizing NCI cool roof colors 3 and

insulated metal panels in your energymodels, you can reduce external loadsand downsize HVAC equipment to help get

the most points possible.

MR Credit

4.1 and MRCredit 4.2

Recycled Content:

10% and 20%Up to 2

Depending on the nature of the project,

NCI metal buildings will contain between25% and 60% recycled steel by weight5.

(Post-consumer + Pre-consumer) On a

typical project, this will represent about40% of our contract value.

MR Credit

5.1 (under

LEED-NC2.0 and 2.1only)

Regional Materials

: 20%ManufacturedRegionally

1

NCI is comprised of a network ofcompanies operating 39 manufacturing

facilities across the United States andMexico. This network maximizes theamount of material manufactured within a

500 mile radius of most points in the US.

EQ Credit8.1

Daylight and

Views:Daylight75% of spaces

1

NCIs insulated light transmitting panels

are excellent diffusers when utilized onthe roof or walls.

Thus PEB companies in India can take up similar measures and provide green solutions. Such

measures will help the companies in diversifying their product base and at the same time position

themselves as an environmental friendly company.

green buildings pebs

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