A1

Sustainablility Case Study Aranya Bhawan, Jaipur

1. Building Energy
EfficiencyProject
CaseStudy:AranyaBhawan,Jaipur

2. AranyaBhawan,theofficebuildingoftheRajasthanForestDepartmentinJaipur,wasone
ofthefirstprojectsselectedfortheBEEPIntegratedDesignCharretteandthecharrette
washeldinDecember2012.TheprojectwasimplementedbytheRajasthanStateRoad
DevelopmentCorporationLimited(RSRDC)andwasinauguratedon23rdMarch,2015.
During the charrette, energy performance of Aranya Bhawan was simulated, using energy
simulation tool Design Builder/EnergyPlus.
Aranya Bhawan qualifies for 5-star rating under the Bureau of Energy Efficiency (BEE)
star rating programme for office buildings.
BEFORE
CHARRETTE
(SIMULATED)
AFTER
CHARRETTE
(SIMULATED)
ACTUAL
MONITORED
PERFORMANCE
Energy PerformanceIndex
(EPI)
77kWh/m
2
.year53kWh/m
2
.year
43kWh/m
2
.year
Cost of construction (not
including the solar PVsystem)
Rs. 30croresRs. 30.6crores
AnnuAl ElEctri ci ty SAvingS: 3,40,000 kWh PEr yEAr
PAybAck PEriod: 2.5-3yEArS
44% energysavings
2% costincrease
PROJECTDETAILS:
•Built-up area: ~10,000m
2
(excluding basement
parking and servicearea)
•Number of floors:Five
(G+4) + one basement
level for parking and
services
•Number of users:344
•Types of spaces:Offices,
museum, library,
auditorium, guestrooms
OVERVIEW

3. LIGHT COLOURED TERRAZOTILE
40 MMPOLYURETHANE FOAM (PUF) INSULATION
75 MMCONCRETE SCREEDING
150 MMRCC SLAB
HEATTRANSFERRED
SOLARRADIATION
FALLINGON
ROOF
INSIDE
OUTSIDE
Roof: Insulation + Reflective finish
In Aranya Bhawan, Polyurethane
Foam(PUF)insulationisused
over the roof slab to reduce heat
transfer. Light coloured terrazo tile
finish reflects some of the solar
radiation falling on theroof.
ALUMINIUMFRAME
6 MM THK TOUGHENED LOW-EGLASS
INSIDE
OUTSIDE
12MMAIRGAP
6MMTHICKCLEARGLASS
OUTSIDE
PLASTER
115MMBRICKWALL
50MMXPSINSULATION
BRICKWALL
PLASTER
HEATTRANSFERRED
INSIDE
Wall:Insulation
InAranyaBhawan,ExtrudedPolystyrene(XPS)
insulationisusedinthecavitywallstoreduce
heattransfer.
Window: Double Glazed Unit(DGU)
ThewindowsofAranyaBhawanusetwo
panesofglasswithanairgapinbetween.
Thisairgapactsasinsulation.Thelow-e
outerpanealsoreflectsheatbacktothe
outside.
ENERGY EFFICIENCYMEASURES
BUILDINGENVELOPE

4. •A centralised high-efficiency water-cooled chiller was implemented for air-
conditioningthebuilding.Ituseslesserenergycomparedtoanair-cooledsystem.
•Given the water scarcity in Jaipur, treated waste water is used in thissystem.
SOLAR PHOTOVOLTAIC (SPV)SYSTEM
Waste Water
TreatmentPlant
CoolingTower
Chiller
AranyaBhawan has
installedagrid-connected
roof-topsolarPVsystem
withnetmetering.The
systemsizeis45kWp
withanestimatedannual
electricitygenerationof
around60,000kWh.An
additional100kWp
systemwillbeinstalled
onthegroundsofthe
building.
AC
Load
Meter -Generation
Inverter
PVArray
Meter -Consumption
PowerGrid
ENERGY EFFICIENCYMEASURES
COOLINGSYSTEM

5. ENERGY
MONITORING OF
ARANYABHAWAN
Winter andsummer
monitoring
Electricity end-use
in thebuilding
Monitor electricity
consumption ofthe
building
Actualenergy
performanceindex
(EPI)
Monitor
performance of
Solar PVsystem
Solar fractionof
PVsystem
POST-OCCUPANCYENERGYMONITORING
TheactualenergyandthermalperformancemonitoringofAranyaBhawanwascarried
outbyEnergeticConsultingPvt.Ltd.(ECPL).Thiswasprimarilydonein2stages:winter
monitoringwasdonefrom11thJanuaryto25thJanuary,2016andsummermonitoring
wasdonefrom5thMayto19thMay,2016.
ENERGY PERFORMANCE MONITORING

6. 0
8
7
6
5
4
3
2
1
5
.
5
5
.
3
4
.
6
4
.
5
3
.
9
3
.
4
3
.
3
3
.
2
3
.
9
4
.
5
6
.
1
6
.
7
5.4
5
.
7
5
.
2
4.9
5
.
3
3
.
4
1
.
1
1
.
2
1
.
3
1
.
4
2
.
0
3
.
9
May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16Apr-16
SimulatedEPI ActualEPI
kWh/m
2
.month
10000
20000
30000
40000
50000
SPV plant
of
26 kW
p
installed
Capacity increased frome 26 to 45
kW
p
Bi
-
Directional
Meter
Installed
0
May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16Apr-16
SolarElectricity GridElectricity
ThesolarphotovoltaicsystemwascommissionedinthemonthofOctober2015.Thus,
tilltheendofthemonitoringperiod(April2016),thesolarfractionwas5%ofthetotal
electricityconsumedinthebuilding.Itisexpectedthattheannualsolarfractionfor
Jan-Dec2016wouldbenearly20%.
kWh/m
2
.month
COMPARISONOFENERGYPERFORMANCEINDEX(EPI):
Simulatedvs.Actual
ThesimulatedEPIduringthecharrettewas53kWh/m
2
.yrascomparedtotheactualEPI
of43kWh/m
2
.yr.Thedifferenceisinthewinter(Nov-Mar)monthswhentheHVACsystem
remainsoff.Inthesimulationdoneduringthecharrette,itwasconsideredoperational.
Theartificiallightingenergyconsumedinwinterwasalsolessthanthatestimatedinthe
charretteduetobetteruseofdaylight.
MonthlyEPIComparison:Simulatedvs.Actual
ENERGY GENERATED AND USED FROM THE SOLAR PV SYSTEM
Actual monthly energy consumption of AranyaBhawan
ENERGY PERFORMANCE MONITORING RESULTS

7. Chiller
54%
PrimaryPump
5%
10%
CTFan
4%
12%
AHU
15%
Break-up of HVAC energyconsumption
Lighting
17%
Office Equipment
69%
STP
10%
Winter (Nov Feb)
MiscellaneousHVAC
4% 0%
Lighting
5%
Office Equipment
26%
STP
2%
HVAC
60%
Summer(Mar-Oct)
Lighting
6%
OfficeEquipment
31%
3%
STP
Miscellaneous
7%
HVAC
53%
Annual Energy ConsumptionScenario
ELECTRICITYEND-USEINARANYABHAWAN
Inthesummermonths(Mar-Oct)60%oftheelectricityisconsumedbyHVAC.Annually,
thisaccountsfor53%oftheelectricityconsumed.Officeequipmentconsumes30%of
theannualelectricitywithartificiallightingconsuming6%.
OftheelectricityconsumedinHVAC,thechillersconsume54%,pumpsconsume27%and
theAHUandcoolingtowerfansconsume19%.
Thestudyalsoshowedthatofthe2operationalchillers,onewasoperatingatabetter
COP(7.5)thantheother(5.5).Thiscouldbeattributedtofouledtubesoftheunder-
performingchiller.
RECOMMENDATIONSOFTHEENERGYMONITORINGSTUDY
•Reduction of contract demand from 500 kVA to 400 kVA as the recorded demand did
not exceed 300kVA.
•Improve condenser approach for under-performing chiller by cleaning the condenser
tubes and maintaining waterquality.
•Improve cooling towerefficiency.
•Replacecondenserwaterpumps&primarychilledwaterpumpwithrevisedcapacity
(pressure &flow).
ENERGY PERFORMANCE MONITORING RESULTS