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Energy Conservation Case Study for Mini Office Retrofitting Multiple Split Air Conditioners With Digital Scroll VRF at ICPCI, Powai, Mumbai Manas Kundu, ICPCI on 18 Dec 2009

Executive Summary • Retrofitted 7 nos. Split ACs with latest technology Digital Scroll VRF at a Small Office in Mumbai – To Improve Comfort Conditions & To Reduce Energy Bill

• TERI assigned with Pre & Post Audit for Verification of Energy & Comfort conditions before and after VRF Installation • Project Timelines – Baseline Energy Audit In April 2008 – Digital Scroll VRF Commissioned In May 2008 – Post Installation Audit In August 2009

• Energy Consumption Reduced In kWHr By 31% On Annual Basis –

38% Energy Cost Saving Realized

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Agenda • • • • •

Challenges Faced Pre Audit Findings Digital Scroll VRF Technology Post Audit Findings Results

Agenda • • • • •

Challenges Faced Pre Audit Findings Digital Scroll VRF Technology Post Audit Findings Results

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Back Ground • International Copper Promotion Council India (ICPCI) Office Is At Hiranandani Gardens, Omega Complex, Powai, Mumbai-76 • 2,000 Sq Ft And 11 Employees • Leased Property Since June 2000; Promoters Hiranandani Builders • Six + Basement Storey Building; ICPCI Office Is At 6th Floor • Original Property Came With 7 Split Air Conditioners Fitted At Different Places In The Offices

Details Of Air Conditioners Used

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Challenges Faced

• Existing Split ACs Could Not Maintain Comfort Conditions – Situation Persisted Even Under AMC With A Reputed Dealer • Increasing Trend Of Annual AC Energy Consumption – ICPCI Power Supply Under LT2 Tariff From Reliance Power • Intangible Challenges – Ashthetic Looks, Pigeon Menace – Floor Space Utilization For Outdoor Units – High Sound Level Of Outdoor Units • ICPCI Felt A Strong Need To Improve The Conditions – ICPCI Discussed The Issue With Emerson Climate Technologies – Evaluating Alternate Option (5 star Vs VRF Vs Inverter) – Decided To Switch Over To Digital Scroll VRF AC System

Agenda • • • • •

Challenges Faced Pre Audit Findings Digital Scroll VRF Technology Post Audit Findings Results

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Energy Audit • TERI ---Industrial Energy Efficiency Division, Bangalore • Instruments Used – – – – – –

Krykard ALM-32 Power & Harmonics Analyser Fluke- 41B Power & Harmonics Analyser Anemometer Digital Indicators & Thermocouples Lux Meter Multi Function Kit

Pre Audit Methodology • Parameters Measured By TERI –

–

– –

Temperature & Relative Humidity Of Inlet & Outlet Air , User Area Velocity & Flow Rate Of Air Across The Condensers KW, KVA, Power Factor, Amperage & Voltage Lux Level

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Pre Audit Findings

Monthwise Electrical Consumption & Cost

Performance Evaluation Of AC Units

Comparison With BEE Guidelines Area

Actual Floor Capacity Area TR Sq.M

Specific TR/Sq.M

Reception

0.46

12.54

0.036

Server Room

0.74

5.02

0.147

Main Hall

0.95

23.65

0.040

Director Chember

0.71

11.78

0.060

CEO Chember

0.99

12.47

0.080

Main Hall

0.89

38.87

0.023

Conference Room

1.52

20.8

0.073

Specific TR/Sqm Of Facility

Particulars

Specific TR/Sq.M

Small Office Cabins

0.1

Medium Size Cabins and Centralized AC

0.06

Large Office With Centralized AC

0.04

BEE Guidelines Of TR/ Sq m For Different Complexes

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Electrical Load Facility

Loading Parameters ICPCI Incomer

Power Consumption With Time

Connected Lighting Load Load Trend Of The Facility Measured Lux Levels

Agenda • • • • •

Challenges Faced Pre Audit Findings Digital Scroll VRF Technology Post Audit Findings Results

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VRF A/C Market Transition VRF A/C

Conventional Splits

Benefits Of VRF A/C Systems

± °C

• Precise Temperature Control 0.5 • Better Humidity Control • Individual Room Comfort Control • Superior Aesthetics & Prestige

Fixed Speed Systems Do Not Match Load Requirements Compressor Output

Compressor Cycling (Inefficient)

Inadequate Heating

-20

-10

0

10

20

Inadequate Cooling

30

40

Ambient Temperature (o C)

Heating

Cooling

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Modulated Compressor Matches Supply & Demand • Capacity Matches Load • Energy Savings • High Comfort Compressor Output

Inverter 40% - 100%

Digital Scroll 10% - 100%

-20

-10

0

10

20

Ambient Temperature (o C)

Heating

30

40 Cooling

Emerson Climate Technologies Powering The Leading Air Conditioning Systems

Digital Scroll Technology

Energy Saving Reliability Human Comfort Flexibility

India OEMs: (1) Blue Star, (2) Carrier, (3) Samsung, (4) Voltas and (5) York

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Digital Scroll Control System

+

+

Basic Package

Indoor Controller

Remote

Typical Modulated System Configuration Communication

Outdoor Unit

Multiple Indoor Units

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Modulation Mechanism

1.0 mm Scroll Separation

Loaded (1)

Unloaded (0)

Full Capacity

Zero Capacity

Ex: 20% Output

Ex: 50% Output Full Capacity

Full Capacity

Zero Capacity

Zero Capacity

2 Sec

5 Sec

8 Sec

5 Sec

Seamless Capacity Delivery Capacity = (Loaded Time x 100% + Unloaded Time x 0%) Total Time Example: Cycle Time = 10 Seconds Capacity

Loaded Time

10% 11% 12% … … 25% … 50% … 90%

1.0 Second 1.1 Second 1.2 Second

2.5 Second 5.0 Seconds 9.0 Seconds

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Part Load Function Of Digital VRF 12 HP Example Sequence Of Compressor Operation 6HP Digital

6HP Fixed

Part Load %

100% (12.0HP) 90% (10.8HP) 75% (9.0HP)

ON : No modulation ( 6HP ) ON 80% Modulation (4.8HP) ON 50% Modulation (3.0HP)

ON ( 6HP) ON ( 6HP) ON ( 6HP)

50% (6.0HP)

ON : No modulation (6HP)

OFF (0HP)

30% (3.6HP)

ON 60% Modulation (3.6HP)

OFF (0HP)

25% (3.0HP)

ON 50% Modulation (3.0HP)

OFF (0HP)

10% (1.2HP)

ON 20% Modulation (1.2HP)

OFF (0HP)

ON 10% Modulation (0.6HP)

OFF (0HP)

5% (0.6HP)

Details of Digital VRF System To Replace Existing Multiple Split ACs • Digital VRF Airconditioner –

–

Designed,Manufactured,Installed & Commissioned By Blue Star Copeland Digital Scroll Compressor Used In The VRF AC

• Switched From Seven Nos of R22 Gas 1.5 & 2 TR Split ACs To Single 12HP R410A Digital VRF AC Connected To Eight Indoor Units • All Digital VRF Systems Come With R410A Gas, Taking Care Of Future Need Of R22 Phase-out, To Protect Climate (Reducing Global Warming)

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Agenda • • • • •

Challenges Faced Pre Audit Findings Digital Scroll VRF Technology Post Audit Findings Results

Last Three Years Electrical Consumption

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Last Three Years Energy Bill Pattern

Note: Difference In Percentage Saving & Cost Saving is Due To Change In Tariff From Rs 8.5 To Rs. 9.4 Per kWHr

Results • 31% Annual Energy (kWh) Saving • Improved Human Comfort & Working Environment – – –

• • • •

Low Sound Performance Flexibility In Using Different Types & Capacities Of Indoor Units Allows Different Rooms To Be Set At Different Temperatures

38% Realized Annual Electricity Bill (Cost) Saving Transition To Environment Friendly R410A Refrigerant Improved Aesthetic Look (Internal and External) Outdoor Unit Floor Space Savings

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