Energy Efficiency Guidelines_darft

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MNRE: Guide Lines For Energy Efficiency 2009

2 Environmental Design Solutions

A SET OF CLIMATE ZONEWISE ENERGY

EFFICIENCY GUIDELINES FOR COMERCIAL &

RESIDENTIAL BUILDINGS

SummaryIn India, there are several norms, regulations, codes and standards to establish energy efficient

buildings that have been evolved by various ministries and government bodies. The MNRE invited

consultants to bid for an assignment which shall harmonize various energy efficiency and renewable

energy related codes/standards/ norms and guidelines for buildings and larger habitats.

The aim of this study is to propose a set of climatic zone-wise passive architectural guidelines

including other energy efficiency and renewable measures for buildings both in residential &

commercial sectors to be followed by CPWD and Municipal Corporations all over the country. The

guidelines are in harmonization with ECBC 2007, NBC 2005, EIA notification 2006, other relevant IScodes.

The guidelines have taken into account the provisions of the National Building Code 2005; the Energy

Conservation Building Code 2007 announced by BEE and other IS codes. The guidelines by its

qualitative and quantitative assessment criteria would be able to ensure an optimized green building

design focusing on passive and other energy efficient techniques. It would be applied to new building

stock of varied functions commercial, institutional, and residential.

MethodologyNOTE - National codes/standards referred for this project are duly referenced. In case of absence of a

local code/standard a relevant international Code/standard is referred. However in absence of both

relevant suggestions are proposed by EDS.

By-laws of different regions/states like Delhi, NCR region, Jaipur etc are being reviewed to

understand their respective structure and indentify possibilities of incorporating changes within

these.

To have better understanding of bye-laws and identify areas of synergies among the codes/ norms

of the respective departments detailed discussion with BEE, BIS (Respective NBC 2005

Committee Members), MoEF, MOUD, GRIHA secretariat are being held.

Relevant national codes/standards like ECBC 2007, NBC 2005, GRIHA and LEED etc are then

referred to develop enforceable strategies and options to be incorporated as minimum standards in

By-Laws. A list of all relevant common and congruous requirements of the codes and normsformulate one document that covers all aspects related to passive design, energy efficiency and

renewable energy of above mentioned documents in logical sequence(under relevant sections

within bye-laws) that will be followed by architects /building designers.

Wherever relevant, a set of practically adoptable recommendations (with detailed specification)

that can be used by an architect to design and implement suitable energy efficiency measures

(emphasizing solar passive architectural techniques) in all climate zones are being recommended.

The guidelines are formulated in a way such that the municipalities and development authorities

should be able to incorporate these guidelines to modify building by laws as required.


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Future methodology to have further necessary discussions with the officials of MNRE and

GRIHA Secretariat during the time of preparing the documents and will incorporate suggestions

made by them in the documents. Draft guidelines prepared may also be discussed by MNRE with

MoUD and some Municipal Corporations and the suggestions made will be incorporated in the final

document.

RecommendationsBased on the above methodology relevant recommendations are being made emphasizing on solar

passive architectural techniques, energy efficiency along with thermal comfort for commercial and

residential buildings under the following sections:

1. Envelope

2. Heating, Ventilation and Air-conditioning

3. Hot water and Pumping

4. Lighting

5. Passive Design

A document is being formulated to explain all the recommendations under the following categories:

Intentof all the recommendations,

Performance requirementswhich includes detail specifications of types of materials (including

their physical properties like u-factor, r-value etc), efficient equipments (cooling, heating and

lighting), design parameters such as orientation, shading devices, faade glazing ratios, thermal

mass etc. These requirements are to be made mandatory under the respective sections as

specified inIncorporated As and Under Section.

Prescriptive requirements furtherelaborate quantitatively/qualitatively on the recommendations

made under the performance requirements section by specifying the current maximum/minimum

requirements taken from above mentioned codes and standards. In some cases where there are

no existing requirements, relevant suggestions have been made by EDS itself.

Reference standard all theNational codes/standards referred for this project are duly referenced

under this section. In case of absence of a local code/standard a relevant international

Code/standard are referred. However in absence of both relevant suggestions is proposed by

EDS.

Incorporated as and under (Only for Delhi Building Bye-Laws) specifies the relevant section

under which all the respective recommendations are suggested to be made mandatory. However,

further suggestions are required fromBEE, BIS, MoEF, MOUD, GRIHA secretariat for further

clarity on incorporating such under respective categories.

Current requirements specify the existing requirements if any under the bye-laws corresponding

to the respective recommendation.


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BUILDING TYPE - Non Residential

CATEGORY Intent PERFORMANCE REQUIREMENTS PRESCIPTIVE REQUIREMENTS

ENVELOPE Reduceinfiltration

1. Air leakage for glazed swinging entrance doorsand revolving doors shall not exceed 5.0 l/s-m2.

Air leakage for other fenestration and doors shallnot exceed 2.0 l/s-m2.

None

4

Heattransferreductionthroughopaqueenvelope

2. The opaque construction shall comply with themaximum assembly U-factor or the minimuminsulation R-value from ECBC Table - 4.2.

Currently these minimum values are as follows:U-factor R-value

Composite 0.440 2.10 (40mm)Hot and Dry 0.440 2.10 (40mm)Warm and Humid 0.440 2.10 (40mm)Moderate 0.440 2.10 (40mm)

Cold 0.352 2.35 (45mm)

4

Heattransferreductionthrough roof

3. The roof construction shall comply with themaximum assembly U-factor or the minimuminsulation R-value from ECBC Table - 4.1.

Currently these minimum values for day-time use buildingsare as follows:

U-factor R-valueComposite 0.409 2.10 (40mm)Hot and Dry 0.409 2.10 (40mm)Warm and Humid 0.409 2.10 (40mm)Moderate 0.409 2.10 (40mm)Cold 0.409 2.10 (40mm)

4


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Energy &water usereduction ofswimmingpools

4. Heated pools shall be provided with a vaporretardant pool cover on or at the water surface.Pools heated to more than 32C (90F) shall havea pool cover with a minimum insulation value of R-2.1

PASSIVEDESIGN

AdequateDay-lighting

1. If the effective width of the habitable room ismore than 2 to 2.5 times the distance from the floorto the top of the opening a l ight shelves at aminimum height of 7 feet from the floor level shouldbe provided for deeper penetration of diffuse light..


2. For room depth greater than 8 mts openings ontwo opposite sides shall be provided to give greateruniformity of internal daylighting. Both the oppositewalls in these cases shall be adjacent to anexternal space or an internal courtyard/atrium.


3. In case of multiple blocks within the samecomplex, the relative availability of daylight inmultistoried blocks of different relative orientationsshould be checked from Table 7 of NBC 2005section 4.2.9.

Minimum

Day-lighting

4. Minimum requirement of 10% openings shall be

met for all habitable rooms having a maximumdepth of 7 mts. Beyond that, the percentage willincrease by 10% for every additional 7mts.

Adequatefresh airsupply

5. Fresh air requirements shall comply with thedesign guidelines provided for ventilation in theNational Building Code of India 2005 Part 8, 5.2.2.1


6. Broader openings shall have their cills raised by300 mm to 600 mm above the working plane.

Naturalventilation

7. A minimum 4 percent window to floor area ratioshould be provided as a provision for naturalventilation indoor.


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BUILDING TYPE - Residential

CATEGORY Inten t PERFORMANCE REQUIREMENTS PRESCIPTIVE REQUIREMENTS

ENVELOPE Reduceinfiltration

1. Air leakage for glazed swinging entrance doorsand revolving doors shall not exceed 5.0 l/sm2.

Air leakage for other fenestration and doors shallnot exceed 2.0 l/s-m2.

None S4

Heat transferreductionthroughopaqueenvelope

2. The opaque construction shall comply with themaximum assembly U-factor or the minimuminsulation R-value from ECBC Table - 4.2.

Wall Assembly U ValueClimate Zone Maximum U-Value of the

overall assembly(W/m2K)Composite 1.1

Hot and Dry 1.1Warm and Humid 1.25Moderate 1.25Cold 0.5

S4

Heat transferreductionthrough roof

3. The roof construction shall comply with themaximum assembly U-factor or the minimuminsulation R-value from ECBC Table - 4.1.

Roof Assembly U ValueClimate Zone Maximum U-Value of the

overall assembly(W/m2K)Composite 0.50Hot and Dry 0.50Warm and Humid 0.50Moderate 0.50Cold 0.50

S4


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Prevent heatloss

Provide solar water heating system to satisfy hotwater requirement for domestic purposes. Theminimum hot water requirement for domesticpurposes should be calculated for 25 liters perperson per day

S5

Energy &water usemeasurementandverification

Provide meters for any four of the following: Energy meter for air-conditioning Energy meter for internal lighting Energy meter for external lighting Energy meter for municipal water pumping Energy meter for water pumping for landscaping

S

PASSIVEDESIGN


1. If the effective width of the habitable room ismore than 2 to 2.5 times the distance from the floorto the top of the opening a light shelves at aminimum height of 7 feet from the floor level shouldbe provided for deeper penetration of diffuse light..

a


2. For room depth greater than 8 mts openings ontwo opposite sides shall be provided to give greateruniformity of internal daylighting. Both the oppositewalls in these cases shall be adjacent to an

external space or an internal courtyard/atrium.


3. In case of multiple blocks within the samecomplex, the relative availability of daylight inmultistoried blocks of different relative orientationsshould be checked from Table 7 of NBC 2005section 4.2.9.

Minimum Day-lighting

4. Minimum requirement of 10% openings shall bemet for all habitable rooms having a maximumdepth of 7 mts. Beyond that, the percentage willincrease by 10% for every additional 7mts.

Adequatefresh airsupply

5. Fresh air requirements shall comply with thedesign guidelines provided for ventilation in theNational Building Code of India 2005 Part 8, 5.2.2.1 a


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References1. ECBC 2007,

2. NBC 2005,3. EIA notification 2006,

4. other relevant IS codes,

5. GRIHA,

6. LEED India NC Version 1.0

7. LEED India CS Version 1.0

8. IGBC Green Homes,

9. Municipal By-Laws (Delhi, NCR, Jaipur),

10. MNRE (Ministry of New & Renewable Energy) Publications,

11. MoEF (Ministry of Environment & Forest) manual etc.

Documents

Energy Efficiency Guidelines_darft