Pierre Jaboyedoff, PMTU, BEEP

Venue: IHC, Delhi

Date: 02 December, 2016

India Insulation Forum Seminar

“Basics of Thermal Insulation of building for Energy Efficiency”

2Indo-Swiss Building Energy Efficiency Project

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ESTIMATED ENERGY PERFORMANCE INDEXES OF CHARRETTE PROJECTSEnergy Performance Index (EPI) - kWh/m2.yBefore Charrette

Energy Performance Index (EPI) - kWh/m2.yAfter Charrette

PUBLIC OFFICE BUILDING PRIVATE OFFICE/IT BUILDING EDUCATIONAL INSTITUTE HOSPITALTRAINING

3Indo-Swiss Building Energy Efficiency Project

Buildings applying for ECBC Compliance

Meet Mandatory Provisions

Prescriptive Method

All building components need to comply the code individually

Other building components need to comply the code individually

Envelope Trade-off Method

Whole Building Performance Method

Annual Energy Simulation of Whole Building

kWhproposed ≤ kWhprescriptive

Allows trade-off among envelope components (Wall, Roof & Fenestration) based on total Envelope Performance Factor

EPFproposed ≤ EPFprescriptive

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0

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2,00,000

3,00,000

4,00,000

5,00,000

6,00,000

7,00,000

8,00,000

0 2 4 6 8 10 12 14

• Insulation applied on a tight building without proper shadingand/or natural ventilation may lead to increased annualcooling demand– Cooling might be used throughought the year (even in winter)

– Comparison• Example of a building

– Without insulation

– With insulation

– Winter cooling ?• Lack of solar protection

– Passive solar overheating

• No «heat removal»– Lack of free-cooling

– Lack of natural ventilation

Cooling demand (kWh/month)

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• Insulation is to be applied in conjunction with

other building elements/systems

1. Reduce solar gains

1. Window to wall ratio

2. Static shading

3. External shading

2. Use natural cooling

1. Natural ventilation

2. Free cooling

3. Insulate

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• Examples of heat loads for a residential home

with 3 faces exposed

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• Building tightness (when closed)

• Insulated and low SHGC glazing

• Insulation on walls

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• Increase of WWR to 50%

• Use of external movable shading

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Aranya Bhawan is the new office building of the Rajasthan Forest

Department in Jaipur, inaugurated in March 2015.

11Indo-Swiss Building Energy Efficiency Project

• Client: Rajasthan Forest

Department

• Executing Agency: Rajasthan

State Road Development and

Construction Corporation Ltd.

(RSRDC)

• Architects: Mathur, Ugam and

Associates

As at the time of charrette, the orientation and building massing was

already finalized; the focus was more on envelope & HVAC measures

BEEP Integrated Design Charrette was held in December 2012, adopting a

collaborative working approach between the client, RSRDC & the architect.

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Roof Insulation

Wall Insulation

Double-Glazed Windows

Reduction in Glazed Area

U-value: 1.8 W/m2.K

SHGC: 0.24

VLT: 36%

U-value: 0.6 W/m2.K

U-value: 0.5 W/m2.K

Low WWR (Windows to Wall Ratio) = 21%

Relatively shallow floor plates

Solar gains equivalent to a SHGC of 0.06 for

80% WWR

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• Slab to

outside

• Pillars

• Relative

surface of

thermal

bridging

(35%):

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Water Cooled Energy Efficient Chiller (using water after waste water treatment)

Passive downdraft

evaporative cooling in

the stairwell

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0

50

100

150

200

250

Before the charrette After charrette

Cooling system size (TR)

28% reduction

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EPI: 77

kWh/m2/year

EPI: 53

kWh/m2/year

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3.3

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4.5

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

kWh

/m2.m

on

th

Monthly EPI Comparison: Simulated vs. Actual

Simulated EPI Actual EPI

Actual EPI: 43 kWh/m2.yearBEE 5 star benchmark: 90 kWh/m2.year

Cooling system off and natural ventilation during winter monthsSaving of ~22%

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West wall receive high direct sun shine. South walls are well shaded.

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South walls will also receive some direct sunshine.

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South facing units in B Block will get good winter sunshine.

Roof surface will always be most exposed to the sun and is very critical

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• West facing units receive high

direct sunshine at the hottest

time of the day i.e. after 3 pm

• North and South facing units (B

Block) receive less direct sunshine

in summer

• End units of B Block will need

special concerns as the west and

east walls are exposed

• Open recreational spaces and the

club house are well shaded in

summer

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• Westernmost units (C block) are

best for ventilation as it faces the

major wind direction

• North-south units (B-Block) would

need special arrangement for

wind movement

• Blocks behind C block will be in

the wind shadow

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01.North.Win_All.Adb.: North façade exposed with windows

02.South.Win_All.Adb.: South façade exposed with windows

03.South.Win_West.Exp.:South & west façade exposed, South facade with windows

04.West.Win_South.Exp.:South & west façade exposed, West facade with glass door

As the orientations and exposure are different, energy simulation is carried out to calculate peak temperature inside the flats on a typical summer day as well as cooling loads.

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~7oC Difference

04.West.Win_South.Exp._Top:South & west façade exposed, West facade with glass door

It is shown that zone 4 can be made as thermally comfortable as zone 1 by suitable design measures. IncludingRoof insulation (U= 0.3 W/m2-°C)Insulated walls (U=0.7 W/m2-°C)External shading (SHGC = 0.15)Window to wall ratio = 0.25Natural ventilation

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04.West.Win_South.Exp._Present Design 04.West.Win_South.Exp._with strategies

Cooling Load (Apr-Jun)

1/3rd Bills for Air Conditioning

04.West.Win_South.Exp._Top:South & west façade exposed, West facade with glass door

It is shown that the air conditioning electricity bill can be reduced to 1/3rd with suitable design measures.

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To know more about BEEP charrettes and to apply for a

charrette, please visit www.beepindia.org