Clean Energy at #CK2017 | Shivraj Dhaka, CIIGBC

1. Energy Efficiency Retrofits in Commercial
Buildings
6 April 2017, IHC New Delhi

2. Retrofit offers immense opportunities for
energy efficiency in buildings
Retrofit opportunity would increase many fold
Quantum energy savings achievable
Owing to advancement in technologies
Paradigm shift
Today it is seen as a
key area for cost savings
Introduction – Need for Retrofitting
Energy consumption for thermal comfort

3.  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

4. 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

5. How to Ensure Performance ?
Building and equipment performance shall
be evaluated
Following several methods
COP/EE
R
kWh/TRh
kWh/sqm/
yr
kW/TR

6. © Confederation of Indian Industry
Approaches for Energy Efficient Retrofit
 3 Pronged approach
 To identify energy savings potential

7. © Confederation of Indian Industry
1) Walk Through Audit
Energy consumption can be reduced by
20-25 % over as on today
 Excellent performance
 86 kWh/m2/yr (Conditioned)
 54 kWh/m2/yr (BUA)
Thermax Corporate office

8. © Confederation of Indian Industry
Retrofit - Energy Saving Measures
 Condenser Pump (retrofit/ VFD)
 Cooling Towers (2 instead of one)
 Chilled water reset (8-9 v/s 6 o
C)
 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

9. © Confederation of Indian Industry
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

10. © Confederation of Indian Industry

11. © 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

12. © Confederation of Indian Industry
a) Dell Office Hyderabad (ITES)
 Significant reduction in energy
consumption
 Continuous performance improvement
• Encourage Stakeholders
• Drive new product and latest technologies
Green Buildings

13. © Confederation of Indian Industry
 Savings: 10-15%
 Payback less than 1 year
 Rs. 1. lakh/chiller (250-320 TR)
Evaporative Condenser Cooling
Evaporative condenser cooling
(Dell Hyderabad)

14. © Confederation of Indian Industry
Installation of VFD
IE2/ IE3 motor, Dell Hyderabad
 Motor efficiency
>92%
Payback : less than 1.5-2 years

15. © Confederation of Indian Industry
 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 2
5 4
7.5 6

16. © Confederation of Indian Industry
Continuous Improvements
 Continuous performance improvements
 Annual budget for retrofitting
 Complete site audit
16%
energy savings
2015-2016
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0
2000000
4000000
6000000
8000000
10000000
12000000
14000000
2004 2006 2008 2010 2012 2014 2016 2018
kWh CMD A_MD

17. © Confederation of Indian Industry
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)

18. © Confederation of Indian Industry
Installation of Occupancy Sensors
Installations occupancy sensors
Payback <1 year

19. © Confederation of Indian Industry
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)

20. © Confederation of Indian Industry
Building Automation : BMS System
 Energy monitoring
1. Main incomer TR1
2. Main lighting panel
3. Auditorium, AC
4. Ground floor AC
5. UPS 1
6. UPS 2
7. Lift
 Find improvement opportunities
 Air-conditioning , Lift, UPS, Lighting, etc.
EMS/BMS Supports in ‘Energy use Accountability’

21. © Confederation of Indian Industry
 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 Fixtures
38 W/ fixture & Efficacy : 132
No. of Fixtures : <100

22. © Confederation of Indian Industry
Thermography of New and Existing
fixtures
Temp. Emiss. Refl. temp.°C
M1 50.0 0.90 20.0
LED 29 °C
Findings of therm

23. © Confederation of Indian Industry
 Cooling energy saving : 4 %
LED Based Lighting Fixtures
Operational cost savings : Rs. 1.2 lacs/ annum
Rs 10, 000/m
savings in
energy bill

24. © Confederation of Indian Industry
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

25. © Confederation of Indian Industry
Further Bring down Energy Usage
 30% efficient over Standard Case
 Performance improvement
opportunities
 20-25 % over As Built case
10.5 10.3
9.2 8.9
7.9 7.7 7.5
5.6
5.1 5.1
175 172
154 149
132 128 125
93
85 85
80
100
120
140
160
180
200
220
240
2
3
4
5
6
7
8
9
10
11
12
ActualCase
NightPurging
Lighting
ExtLighting
VFD_AHU
VFD_Pump
WindTower
SPVIntegration
BMS
EfficientDesign
Consumption(000xkWh)
Operationalcost(Rs.Lac)
Energy cost Energy Consumption

26. © Confederation of Indian Industry

27. 3) Measurement & Verification
Protocols
IPMVP
FEMP
ASHRAE 14P

28. Measurement & Verification (M&V)
 Data collection
 Develop simulation
model
 Calibration
 Building level
 Component level
 Performance
comparison with
latest Codes &
recommend
 Energy Efficiency
Measures (ECMs)

29. Standard case v/s As Built case
Standard Case As Built

30. Inputs for Calibrated Simulation
HVAC (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

31. a) iLabs Hyderabad (ITES)
 Building energy consumption
MBE & CVRMSE, within specified limits
-IPMVP Errors Permissible
limits
Whole building
energy
Monthly MBE ±5% 2.83
Cv(RMSE 15% 6.09

32. Chiller Energy Consumption
Chiller performance
Errors Permissible
limits
Chiller energy
consumption
Monthly MBE ±5% 2.10
Cv(RMSE 15% 7.06

33. Performance Comparison
 As Built case is
10.6 % efficient
over
Standard case
 Performance
improvement
opportunities
 15-20 %

34. 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

35. 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

36. Challenges faced
Large 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

37. Regulatory support (Lead from BEE)
Empaneled Financial Institutions
ESCO’s (now 150 nos. whereas China has 5000)
Partial Risk Sharing Facility (PRSF)
SIDBI & IGBC
Expand proven programs &develop new tools
Engage (Vendors and Building Owners)
Support
Provide additional incentive
Building Energy Retrofit – Financing
Models

38. To sum up
 Reduce energy demand at several level
 Building level
 Society
 City level
 Country level
 Tremendous potential to improve
energy 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

39. For details, please contact:
Dr Shivraj Dhaka, Counsellor,
CII-Indian Green Building Council (IGBC) Hyderabad
shivraj.dhaka@cii.in; 040 44185211; 9177577288