Saving Money and Energy Energy Efficiency Retrofit of Godrej Bhavan
Anjali JaiswalDirector, India Initiative Natural Resources Defense Council (NRDC)
26 October 2013
About NRDCAccelerating Building Energy Efficiency in India
• ASCI-NRDC work in partnership with business and government leaders to accelerate energy efficiency in buildings
• Partner with real estate developers, financial institutions, andnational and local government to promote building efficiency
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About NRDCAccelerating Building Energy Efficiency in India
NRDC and ASCI partner with key stakeholders to promote building efficiency
•Real Estate Developers: Bringing leaders within the developer community to champion energy efficiency
•Financial Institutions: Opening a dialogue on developing financial products for efficiency
•Local and National Governments:Accelerate the momentum to promote efficient construction by addressing larger market share
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About NRDCMaking the Business Case for Energy Efficiency
• Reports: mapping stakeholder opportunities for the real estate sector, outlining action steps for real estate developers, local governments, and financial institutions
• Case Studies: materials and case studies showcasing details of energy efficiency in leading buildings
• Factsheets: resources for saving money for building owners, managers and tenants
Presentation to CREDAI Board
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Our ApproachWorking in partnerships on clean energy and climate change
Our Partners Our Collaborators
Real Estate Developer Workshop on Building Efficiency in Ahmedabad, December 2012
Saving Money and Energy Energy Efficiency Retrofit of Godrej Bhavan
Does Energy Efficiency Actually Save Money?
Saving Money and Energy Energy Efficiency Retrofit of Godrej Bhavan
Does Energy Efficiency Actually Save Money?Key Study
Findings
Electricity costs:
down by 28 %
Total electricity:
usage down 12 %
Costs recouped:
as little as 4.7 yrs.
Potential 15 yr.
savings of
6,980,000 Rs
Godrej BhavanBuilding Basics
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Location Fort, South Mumbai; constructed in 1972
Building area 3,826 square meters (41,185 square feet)
Air-conditioned area 2,192 square meters (23,595 square feet)
Non air-conditioned area 1,634 square meters (17,588 square feet)
Number of floors 2 basements, 6 floors, and a rooftop terrace
Building use Office space
Retrofit completed 2010
Building owner Godrej & Boyce (not leased)
Retrofit financing Self-financed by Godrej & Boyce
Project team Godrej’s Green Building Consultancy Service, Ingersoll Rand
Utility company BEST (11 kV power via two 250 kVA distribution transformers)
Godrej BhavanEnergy Saving Measures
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Area Building Management System
Key Measure� Installed Trane Building Energy
Management System (BMS) dashboard display with digital energy meters
� Upgraded the incoming and outgoing electrical systems for high-voltage electricity to provide greater building safety, reliable operations
� Upgraded the building’s low-voltage system to facilitate metering of the building’s electricity load
Godrej BhavanEnergy Saving Measures
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Area HVAC System Upgrade with BMS Integration
Key Measure� Replaced inefficient Direct Expansion (DX)
HVAC system to new Trane system with a screw chiller, water-cooled condenser, electronic expansion valve, and a high coefficient of performance (COP) of 5.5
� Upgraded cooling tower with temperature controller, and variable water pumping to increase energy efficiency
� Installed air-handling units with variable frequency drives and humidity control for each floor
Godrej BhavanEnergy Saving Measures
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Area Lighting
Key Measure� Installed Philips fluorescent tube lamps with
high- efficiency T-5 fittings (lamp life of 27,000 burning hours and a low mercury content of 1.4 mg per tube) and electronic ballasts with timers to switch office lights off automatically after hours
� Provided natural day light and outside views throughout the building
� Installed double-glazed clear windows and shading devices to reduce heat gain through the windows while still providing light (installed in 2012 after the building retrofit)
Godrej BhavanEnergy-Efficient Retrofit Component Costs
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Energy-Efficient Measures and Audit Cost (INR)
HVAC system replacement(including the building energy management system)
5,000,000
Water flow meters 24,000
Energy metering system 52,000
Auto-blow down controller at the cooling tower 29,000
High reflectance paint for the terrace surface 62,000
Energy audit 45,000
Replaced lights with energy efficient tube lights 172,000
Total cost of installed energy efficiency measures 5,384,000
Godrej BhavanRecovering Investment via Energy Savings
• 11.4% energy savings from retrofit in first year
• Simple payback period of 4.7 years
• Major energy savings derived from HVAC, lighting and building maintenance systems
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Annual Energy Cost and Energy Consumption
Godrej BhavanRetrofit Challenges and Solutions
ChallengeAgeing building with ongoing operations
Solution � Implementation during non-
working hours
� Simultaneous operation of old and new systems during retrofit
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Limited availability of energy efficient products
� Sourcing through special venders through investigation and research
Godrej BhavanLessons for Similar Projects
• Godrej Bhavan’s upgrade demonstrates the real energy and cost savings from implementing energy efficiency in existing buildings
• Commitment starts at the top: Godrej’s corporate commitment to sustainability shaped the project’s efficiency goals. Top-level support for the high-efficiency and cost-savings targets are critical
• Low-hanging savings opportunities: HVAC, lighting, and building management systems are low-hanging energy and cost-saving opportunities
• Building operations and maintenance are key: Beyond installing efficient equipment, train staff to continually analyze energy performance, transforming building operations, correct discrepancies and increase energy savings
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NRDC-ASCI Building Efficiency Case Studies
Dissemination Is Essential
•Retrofit Example - Godrej Bhavan Upgrade
•New Building - currently modeling and analyzing
•ESCO Model – in development
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Thank you!
Natural Resources Defense Council
www.nrdc.org/international/india
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Energy Conservation Building Code
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Energy Conservation Building Code
• A set of standard energy efficiency measures
• Save 1.7 billion kWh of electricity in India annually
• Applicable to commercial buildings, offices, hospitals, IT parks, and high-rise residential buildings
• Applicable to buildings with loads larger than 100 kW or 120 kVA
• LEED, GRIHA, and other green building rating systems must meet ECBC standards at a minimum
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Source: Rawal et al. 2012
Current Progress on ECBC
• Voluntary at national level
• Champions states for ECBC adoption so far are Andhra Pradesh, Rajasthan, Orissa, Delhi, Maharashtra, Uttar Pradesh, Haryana, Tamil Nadu, Karnataka, and West Bengal
• Karnataka is using a phased approach in implementation, applying ECBC to government buildings in Phase I
Source: United Nations Development Program (2011)
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