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Dept. Of Architecture, School of Planning and Architecture Advantages: oPerfect N-S orientation o One-way continuous slab structure, extremely flexible interior spaces o Many areas are inherently comfortable

Embodied Energy of retrofitting,= 5,00,000 KWh Total Energy saved = 24,01,100 KWh Carbon Credits earned = 846

The building has not lived its full life, hence its embodied energy has still not been justified totally. Prematurely replacing it would be tantamount to wasting this energy.

High solar gain, specially on top floor

Disadvantages: o Compromise on comfort o Inefficient light fixtures, complicated switching system o Severe water-logging o Many unutilized spaces

Dense cluster of small spaces (staff rooms on 1st floor) – increase in heat value Canteen: Dingy and crowded Little natural light/ ventilation

Library: dusty, dim and hot

Severe waterlogging, no RWH

Spaces

3rd – 5th Floor

2 Lecture Halls + 5 Studios

2nd Floor

Library + Computer Center

1st Floor

Staff rooms + Office + Graphics Studio + Conference Hall

Ground Floor

Canteen + Auditorium + Workshop

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Retrofitting > Rebuilding

Embodied Energy of the building in 1965 = 29,01,100KWh = Embodied Energy of a new building today

RETROFITTING SPA, NEW DELHI

Electrical Energy consumed by the building today = 2,37,330 KWh/year

sheet 1 of 7

recycle|reuse|reassemble|renew

Year of Completion: 1965

IGBC GREEN DESIGN COMPETITION 2010

Style: Bauhaus, modern architecture


Financing the renovation o Need an initial one time investment of approx. Rs. 52,76,000 o Saving Rs. 6,97,500 per year on electrical expenditure o Payback time at 7% interest < 11 Years

Percentage of reduction =

44% Wind tunnels with turbines beneath generate electricity to power top half GI covering shades the roof (refer sheet 4) Windows on 1st & 2nd floor changed- double glazing for sound + heat insulation

Stirling engine and generator (refer sheet 6)

Increased roof insulation inside – coir foam

Renewal of plumbing system. More efficient fixtures

sheet 2 of 7

oTo minimize absolute waste by reassembling and hence, reusing o By using redundant building materials from the existing structure, to carry out the retrofitting o To use active energy generation technologies to passively reduce consumption oTo avoid using high quality energy for low quality tasks, to “not use a chainsaw to cut butter”[1] Wind towers ventilate top 3 floors (refer sheet 4) Replacement of old fittings with energy efficient fans and light fixtures Sandwich board Insulation layer on 2nd floor, (max. use of A/C: library, comp. lab) supported by a mild steel framework recycled from old windows

Biogas digester and CNG/biogas mixing tanks (refer sheet 6)

Shady trees to reduce heat gain in parked cars Solar powered outdoor lighting

Earth pipes to cool the bottom 2 floors

The table of REUSE material

source

application

bricks

1st floor faculty area Spill out- north gallery Brick sculptures

Wind tunnel structure

glass

Windows

1st floor partitions

Mild steel sections

Windows

Support for insulation layer

(refer sheet 3)

Underground RWH pit + grey water DEWATS plant, further cools earth pipes (refer sheet 6) [1] The analogy is borrowed from www.canadian architect.com

RETROFITTING SPA, NEW DELHI

o Using heat from stuffy canteen to power stirling engine, making it more comfortable oUsing naturally conditioned air, byproduct of wind turbine, to cool upper floors [refer sheer 4]

1,35,056KWh

o Long-term Sustainability o Optimum Comfort o Functional and Efficient space usage

recycle|reuse|reassemble|renew

Passive Reduction

The Idea

IGBC GREEN DESIGN COMPETITION 2010

Active Production

Electrical energy consumed after retro fitting =

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Our Goal: Net - Zero Energy


Reduction Strategies sheet 3 of 7

Air, surrounded by water, moves around baffles Ambient air catchers Air pressure vent; opens only when lift comes up

Overhead tank

Traction surface for Cog wheel

lift goes down

Vertical Kinetic energy of lift = Potential energy of pumped water

Elevator + Water Pump

Elevator Car

Counter weight

Water from UGT fills up

Pulley system With Piston

600 kg + 700 kg + (40% of 1200) kg = 1680 kg Wt. of lift car

Underground tank

Lift goes down Piston causes suction

Air vent closes Water valve opens

Wt. of water transported per round

Average occupancy of lift

Counterweight

 Electricity for 2 pumps saved, by using the up-down motion of elevator Power consumed by elevator is unaffected as breaking force applied by the lift does not increase.  Ball cock stops water flow after max. capacity is reached Pressure causes water to fill OHT

Lift comes up

Air Vent Opens Water valve closes

Pressure released

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Earth + Water

Underground Grey water + RWH tank, 4m deep

IGBC GREEN DESIGN COMPETITION 2010

Naturally conditioned air is directed into vents to cool 1st and ground floors

RETROFITTING SPA, NEW DELHI

Refer to sheet no. 7 for more

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Lesser A/C’s, reduction Thermal in fan usage time Labyrinth


Production Strategies

Low heat gain, Less fans required

sheet 4 of 7

Vertical axis wind turbine for variable winds

Temperature and pressure differences induce movement Rotating turbine of helium (working gas) generates electricity

Ground-2nd Floor

Solar collector acts as heat source Earth pipes act as heat sink

Sun + Earth

To stirling engine [2] Exhaust fan pulls hot air over coils Coils filled with air/ liquid refrigerant

canteen

[Same technique used to tap heat from refrigerator and transfer to hotcase]

Harnessed STUDIO

Size Height 2m Diameter 1.4m

Natural

Central strip of high volume - low speed fans, for humid days [3]

3125Kwh X 8 Energy per Turbine

= No. of Turbines

25000Kwh/Year Total Power generated

The above values have been calculated for 245 days in a year,12hrs per day. Rated wind speed = 14m/s [4]

E= 40% (efficiency) x ΔT x c (specific heat) x m (mass) summers winters

76°c. 56°c.

solar collector + heat from the canteen

50°c 30°c

26°c. heat sink (earth pipes)

c= 5.1932 J/gK for helium as working gas; 24 cycles per second (24 Hz)

Summers: 47.36 kwh per hour x 10 hours/day Winters: 28.42 kwh per hour x 8 hours/day

114650 kwh per year

Stirling engine draws heat from canteen, thus making it more comfortable. The extra electricity produced on sunny days is stored in batteries for backup On overcast, windy days, balance is compensated by wind turbines. Vice- versa, on calm, sunny days.

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Wind

Wind towers direct the air into studios/ lecture halls after cooling, via exhaust fans

recycle|reuse|reassemble|renew

IGBC GREEN DESIGN COMPETITION 2010

3rd-5th Floor

Prevalent winds from North west

RETROFITTING SPA, NEW DELHI

Gutter for RWH

GI sheet roof to heat inside air and create low pressure, shades 5th floor

[2] Sterling Engines is custom-made, easy to manufacture [3] model – Isis, Big Ass fans ® , dia 2540mm [4] Figures have been quoted from the brochure of Turby ® wind turbines


Changing Spaces

Printing/ photocopying

Air-movement through ventilators

sheet 5 of 7

Pump room size reduced

Exiting spill out retained

More open and ventilated canteen

Gentâ&#x20AC;&#x2122;s toilet

kitchen

Staff bath

Electricity consumption

Larger spaces, permeable walls = sharing of energy Proper placement of objects makes for efficient usage of space and resources More efficient electrical fixtures further reduce consumption.

Staff Area

Canteen

N

Flooded with South sunlight, excellent work atmosphere

Staff Cubicles; Cooled by earth pipes, sharing of light Present Stone wall provides excellent insulation

Conference Hall ; rarely used, hence lesser natural light

N

Staff Toilets

Recycled double glass partitions made from old window panes

General Staff Store Room; privacy from main corridor

Ladyâ&#x20AC;&#x2122;s Common Room toilet

Shelves placed perpendicular to the window for maximum light penetration

A/Cs to be used, so that windows can be kept close, no dust!

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Present

Residential area for canteen staff shifted inside

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Shaded spill out for summers

IGBC GREEN DESIGN COMPETITION 2010

Ventilation and Natural Light

RETROFITTING SPA, NEW DELHI

Elevator

Reading room also converted into library, with seating interspersed

N

Library


Waste and Water Management Biogas digester plant

Kitchen waste + organic waste + paper waste + black water

Prognostic CNG consumption

= 349 m3 /month 3490KWh

Biogas/ CNG mixing tank

Biogas + CNG Used as Kitchen fuel Piped CNG from nearby Indraprastha Gas CNG Petrol Pump

Waste generated per day - Kitchen: 20-25 Kg - Organic: Approx 25Kg - Paper: Approx. 4 Kg - Black Water: 600 Litres Existing LPG consumption 4000 Kwh

Overhead Tank

Rain water collected by GI sheets Collection tank for time-lag

Pumped up by elevator

Grey Water Rainwater Fresh Water

Dewas Filter

Reusing Rain Waster And Grey Water

22 cylinders/month = 321Kg

Treated Grey Water

Underground Tank (Freshwater)

Existing freshwater consumption

27000 Litres/Day 48,60,000 Litres/Year

Supply from MCD

Grey water bought:

Approx. 6000 Litres/Day Grey water generated :

25,500 Litres /Day

2-6 mm 6-12 mm

Rainwater potential from roof:

2,48,500 Litres/Year

12-20 mm

Dewas Filter Diameter =140mm Length =1.2m

DEWATS For grey water + Rainwater on Paving Treated grey water for watering plants etc.

RETROFITTING SPA, NEW DELHI

sheet 6 of 7

Slurry mixing tank

recycle|reuse|reassemble|renew

510 Kwh

IGBC GREEN DESIGN COMPETITION 2010

m3/month

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Replacing LPG with a mixture of Biogas and piped CNG

Biogas produced : 85


Energy Audit

70% 60% 50% 40% 30% 20% 10% 0%

1,39,650 KWh

80%

1,35,056 KWh

90%

ENERGY CONSUMED ENERGY GENERATED

consumption for 9 months (reducing 25%)

STIRLING ENGINE WIND TURBINES KITCHEN APPLIANCES ELEVATOR LAPTOPS PLOTTERS and PHOTOCOPIERS WORKSHOP and LAB TOOLS MISC. LIGHTS EXAUST FANS COMPUTERS and PROJECTORS AC UNITS TUBE LIGHTS FANS

*All data as per audit carried out by SPA students, 3rd year section A, from 09.08.2010 to 24.08.2010

What we didnâ&#x20AC;&#x2122;t do, and why Use solar panels. Not sustainable, tough to dispose, high initial costs and embodied energy.

Produce electricity from biogas. On this relatively small scale, energy production is unviable and too expensive in the long run. The costs far outweigh the benefits.

Compensate for LPG consumption by producing more electricity Using electricity to cook, i.e. heat, is a waste of a high quality source for a low quality task. The efficiency is very low.

Introduce structural changes/ renovation Achieving zero energy with min. interference, embodied energy costs

RETROFITTING SPA, NEW DELHI

44% 44%

recycle|reuse|reassemble|renew

100%

322782.54 180074.70 142707.84 237330.91 135056.03 107030.88

IGBC GREEN DESIGN COMPETITION 2010

ENERGY CONSUMPTION AND GENERATION

sheet 7 of 7

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Existing no. of Fittings/Appliances fittings Fans 269 New Fans 8 Tube Lights 665 New Tube lights 10 A/C units 36 New A/C units 6 Computers 254 Exhaust Fans 28 New exhaust fans 4 Ceiling lights 105 Outdoor Lighting 23 LED flood lights 2 jigsaw 1 Drilling machine 1 Crushing machine 1 Stretching machine 1 Concrete mixer 1 plotters 2 Photocopiers 2 laptops 200 New laptops 100 projectors 2 elevator 1 Water Pump 1 Refridgerators 2 Hot case 1

Summer Winter reduced Percentage existing reduced existing reduced Power Reduced Reduction in Reduction in No. of No. of hours of No. of No. of hours of Power Power Power reduced No. of hours of hours of usage/ hours of hours of usage/ existing Power consumed Existing Power consumed per per hour consumed/ consumed/ consumed/ consumed/ no. of fittings usage/ usage/ week usage/ usage/ week (Watts) year (KWh) year (KWh) year (KWh) year fittings reduced week week reduced week week reduced hour (Watts) 36906.80 12642 24264.80 66% 172 97 49 35 14 0 0 0 80 60 823.20 588 235.20 29% 8 0 49 35 14 0 0 0 60 60 49329.28 11209.2 38120.08 77% 665 0 28 7 21 42 21 21 52 28 1391.60 678.2 713.40 51% 10 0 91 42 49 105 56 49 28 28 84672.00 49392 35280.00 42% 28 8 42 42 0 0 0 0 1600 1200 14112.00 13230 882.00 6% 6 0 56 56 0 0 0 0 1200 1200 55473.60 55473.6 0.00 0% 254 0 21 21 0 21 21 0 200 200 2216.80 1705.2 511.60 23% 28 0 28 28 0 14 14 0 65 50 439.60 2903.6 -2464.00 -561% 34 -30 56 42 14 14 14 0 50 50 24460.80 289.8 24171.00 99% 105 0 56 1 55 56 2 54 40 40 8919.40 0 8919.40 100% 23 0 70 70 0 84 84 0 100 0 480.50 480.5 0.00 0% 2 0 77 77 0 77 77 0 60 60 3 104.00 104 0.00 0% 1 0 1 1 0 1 1 0 2000 2000 26.00 26 0.00 0% 1 0 0.5 0.5 0 0.5 0.5 0 1000 1000 11.70 11.7 0.00 0% 1 0 0.1 0.1 0 0.1 0.1 0 2250 2250 13.52 13.5 0.02 0% 1 0 0.1 0.1 0 0.1 0.1 0 2600 2600 23.40 23.4 0.00 0% 1 0 0.2 0.2 0 0.2 0.2 0 2250 2250 1248.00 1248 0.00 0% 2 0 30 30 0 30 30 0 400 400 4992.00 4992 0.00 0% 2 0 40 40 0 40 40 0 1200 1200 5616.00 5616 0.00 0% 200 0 6 6 0 6 6 0 90 90 1872.00 1872 0.00 0% 100 0 4 4 0 4 4 0 90 90 468.00 468 0.00 0% 2 0 15 15 0 15 15 0 300 300 14560.00 12740 1820.00 13% 1 0 35 35 0 35 35 0 8000 7000 7758.40 0 7758.40 100% 1 0 20 20 0 20 20 0 7460 0 4368.00 4368 0.00 0% 2 0 140 140 0 140 140 0 300 300 2496.00 0 2496.00 100% 1 0 40 40 0 40 40 0 1200 0

IGBC Green Design Competition 2010 Entry  

Got a Jury Commendation. (c) Bhavika Aggarwal and Varun Bajaj

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