ck2017: energy efficiency retrofits in commercial buildings
TRANSCRIPT
Energy Efficiency Retrofits in Commercial Buildings
6 April 2017, IHC New Delhi
Retrofit offers immense opportunities for energy efficiency in buildingsRetrofit opportunity would increase many
fold
Quantum energy savings achievableOwing to advancement in technologies
Paradigm shiftToday it is seen as a
key area for cost savings
Introduction – Need for Retrofitting
Energy consumption for thermal comfort
Execution of O&M practices support project to
Enhance energy performance over time
Opportunities to Bring Down O&M Cost
Negligence in O&M
Proper O&M practices
At O&M Each Building Component has Imp. Role Buildings lead to dynamic performance
Interaction with climate & operational features Continuous monitoring is essential
To understand building behavior and take action plan
Building Performance
How to Ensure Performance ?Building and equipment performance
shall be evaluated Following several methods
COP/EER
kWh/TRh
kWh/sqm/yr
kW/TR
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Approaches for Energy Efficient Retrofit
3 Pronged approach To identify energy savings potential
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1) Walk Through Audit
Energy consumption can be reduced by20-25 % over as on today
Excellent performance 86 kWh/m2/yr (Conditioned) 54 kWh/m2/yr (BUA)
Thermax Corporate office
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Retrofit - Energy Saving Measures Condenser Pump (retrofit/ VFD) Cooling Towers (2 instead of one) Chilled water reset (8-9 v/s 6 oC) Variable pump High Efficiency Motors (IE2 & IE3) Heat Recovery Wheel (delta T >5) Makeup cooling tower (5-6 kL/day) Installation of CPM Raised thermostat – UPS & server room Efficient interior lighting Adaptive thermostat Glass film (to reduce heat & glare) High albedo roof Rooftop SPV Others
Potential in Service Scalability
ECMs based on
Simple Payback
•Short term
•Medium term
•Long term
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Way forward – Office Buildings Feasible to save 20-25% energy Opportunity to offset grid energy
10-20% RE generation 3-5 storey building (depends on roof area
available)
Moderate energy performance
Significant water saving Leads to building energy efficiency
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© Confederation of Indian Industry
2) Green Buildings Holistic approach Implementation of green feature
offers Enhanced building performance
Enable projects to benchmark energy consumption
Metering & monitoring supports in continuous performance monitoring
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a) Dell Office Hyderabad (ITES) Significant reduction in energy
consumption Continuous performance improvement
• Encourage Stakeholders• Drive new product and latest technologies
Green Buildings
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Savings: 10-15% Payback less than 1 year
Rs. 1. lakh/chiller (250-320 TR)
Evaporative Condenser Cooling
Evaporative condenser cooling (Dell Hyderabad)
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Installation of VFD
IE2/ IE3 motor, Dell Hyderabad
Motor efficiency >92%Payback : less than 1.5-2 years
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Installation of SPV 230 kWp & 130 kWp 4.8 Lakh Units Offset 6% grid energy
Renewable Energy (RE)
Every project has potential to have SPV system(10-15% energy offset in Office Buildings)
High SRI Paint + SPV
Installed 360 kWp SPV, Dell HydGreen Building – RE Approach
RE as a % of total kWh
Credit points
2.5 25 4
7.5 6
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Continuous Improvements Continuous performance improvements
Annual budget for retrofitting Complete site audit
16% energy savings
2015-2016
0
500
1000
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2000000
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2004 2006 2008 2010 2012 2014 2016 2018
kWh CMD A_MD
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b) HZL Udaipur – Key Features Retrofitting of lighting fixtures
Exterior & Interior SPV
100 kWp Occupancy sensor
Facility areas High SRI paint Cloud based energy &
water monitoring
HZL Udaipur (Platinum Certified)
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Installation of Occupancy Sensors
Installations occupancy sensors Payback <1 year
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Fresh Air Ventilation – Enhanced Comfort
Fresh air supply integrated with 7 AHU’s Improves health and comfort
Fresh air supply (Inside – AHU room), HZL
Further targets: •Installation of Heat Recovery Wheel (HRW)
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Building Automation : BMS System
Energy monitoring 1. Main incomer TR12. Main lighting panel3. Auditorium, AC4. Ground floor AC5. UPS 1 6. UPS 27. Lift
Find improvement opportunities Air-conditioning , Lift, UPS, Lighting, etc.
EMS/BMS Supports in ‘Energy use Accountability’
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Retrofitting of existing fixtures by LED Lighting
c) GBC - Lighting Retrofitting
LPD (W/ft2)
As Built (2003)
1.04
Existing (2016)
0.49
72 W/ fixture, Efficacy : 60, No. of fixtures : 211
Installed Lighting Fixtures38 W/ fixture & Efficacy :
132No. of Fixtures : <100
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Thermography of New and Existing fixtures
Temp. Emiss. Refl. temp.°CM1 50.0 0.90 20.0
LED 29 °C
Findings of thermography reveal thatExisting lighting dissipates heat into the conditioned area which increases HVAC load
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Cooling energy saving : 4 %
LED Based Lighting Fixtures
Operational cost savings : Rs. 1.2 lacs/ annum
Rs 10, 000/m savings in energy bill
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Building Automation System Smooth operation
Air-conditioning , Fans, Pumps, Lighting, etc. Scheduling / Re-tuning of equipment
operations Re-tuning is a systematic process to identify
operational problems
BMS enables energy efficiency by 8-10%
Cloud based
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Further Bring down Energy Usage 30% efficient over Standard Case Performance improvement
opportunities 20-25 % over As Built case
10.5 10.39.2 8.9
7.9 7.7 7.5
5.6 5.1 5.1175 172
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ase
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ost (
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© Confederation of Indian Industry
3) Measurement & VerificationProtocols
IPMVPFEMPASHRAE 14P
Measurement & Verification (M&V)
Data collection Develop simulation
model Calibration
Building level Component level
Performance comparison with latest Codes & recommend Energy Efficiency
Measures (ECMs)
Standard case v/s As Built caseStandard Case As Built
Inputs for Calibrated SimulationHVAC (Chiller, AHU’s, Pumps, CT, etc.)
Operation Schedules:• Occupancy• lighting,• Ext lighting,• Equipment• Fan,• Thermostat (as per space type)
Building Envelope (Wall, roof, and glazing)
Interior and exterior lighting Load
Equipment load
• Drawings (Architectural and HVAC)
• Performance Data • Site visits
can be further improved
a) iLabs Hyderabad (ITES)
Building energy consumptionMBE & CVRMSE, within specified limits -
IPMVP Errors Permissible limits
Whole building energy
Monthly MBE ±5% 2.83Cv(RMSE 15% 6.09
Chiller Energy Consumption
Chiller performanceErrors Permissible
limitsChiller energy consumption
Monthly MBE ±5% 2.10Cv(RMSE 15% 7.06
Performance Comparison
As Built case is 10.6 % efficient over Standard case
Performance improvement opportunities
15-20 %
List of Energy Conservation Measures Retro-commissioning
Primary, Secondary and Condenser Pumps
Cooling tower Evaporative cooling for
condenser, with Fan control Raised chilled water temperature
Controls CAV to VAV system VFD (AHU Fan, primary/secondary
pumps, Fan – CT and Chiller) Daylight and occupancy control Lighting control CPM (Chiller Plant Manager - Load
and Chiller Sequencing) EMS/ BMS/ Feedback Loop Scheduling
Condenser approach IE Motors
(Fan, Pump, Motors) Glass shade / film to
reduce heat gain High SRI paint over roof Raised thermostat Efficient Lighting fixtures Roof top SPV Demand control ventilation HRW (Delta T>5) Economiser operation Reduce/ replace Plug load
Buildings are designed for Peak design day, however operated like every day is designed day
Experience : Energy Performance Monitoring
EPM service offered to several office and ITES buildings
Owner and O&M team are committed Continuous performance monitoring is
essential ESCO’s are gaining ground Financial model can support to grow
this sector
Challenges facedLarge no. of IT/ITES buildings are
tenant occupied Investment and savings ?
Need awareness Govt. schemes and Industry support Adoption of Green Buildings
Tenants get operating savings from retrofit
Regulatory support (Lead from BEE)Empaneled Financial InstitutionsESCO’s (now 150 nos. whereas China has 5000)
Partial Risk Sharing Facility (PRSF)SIDBI & IGBC
Expand proven programs &develop new toolsEngage (Vendors and Building Owners)SupportProvide additional incentive
Building Energy Retrofit – Financing Models
To sum up Reduce energy demand at several level
Building level Society City level Country level
Tremendous potential to improveenergy efficiency in building sector Energy retrofit will only grow
Climate benefits Leadership in reducing the impact of
climate change
Stakeholder Engagement would result in EE in Buildings
For details, please contact:
Dr Shivraj Dhaka, Counsellor, CII-Indian Green Building Council (IGBC) [email protected]; 040 44185211; 9177577288