CK2017: Energy Efficiency Retrofits in Commercial Buildings

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

Transcript of CK2017: Energy Efficiency Retrofits in Commercial Buildings

Page 1: CK2017: Energy Efficiency Retrofits in Commercial Buildings

Energy Efficiency Retrofits in Commercial Buildings

6 April 2017, IHC New Delhi

Page 2: CK2017: Energy Efficiency Retrofits in Commercial Buildings

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

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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

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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

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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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© Confederation of Indian Industry

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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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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© Confederation of Indian Industry

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

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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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© 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

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Further Bring down Energy Usage 30% efficient over Standard Case Performance improvement

opportunities 20-25 % over As Built case

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3) Measurement & VerificationProtocols

IPMVPFEMPASHRAE 14P

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Measurement & Verification (M&V)

Data collection Develop simulation

model Calibration

Building level Component level

Performance comparison with latest Codes & recommend Energy Efficiency

Measures (ECMs)

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Standard case v/s As Built caseStandard Case As Built

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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

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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

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Chiller Energy Consumption

Chiller performanceErrors Permissible

limitsChiller energy consumption

Monthly MBE ±5% 2.10Cv(RMSE 15% 7.06

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Performance Comparison

As Built case is 10.6 % efficient over Standard case

Performance improvement opportunities

15-20 %

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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

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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

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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

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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

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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

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For details, please contact:

Dr Shivraj Dhaka, Counsellor, CII-Indian Green Building Council (IGBC) [email protected]; 040 44185211; 9177577288