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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 GuidelinesParticulars 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 ComplexesSpecific TR/Sqm Of Facility

Area Actual Capacity TR

Floor Area 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

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Electrical Load Facility

Power Consumption With TimeLoading Parameters ICPCI Incomer

Load Trend Of The Facility

Connected Lighting Load

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 TransitionVRF A/C Market Transition

VRF A/CConventional Splits

Benefits Of VRF A/C Systems• Precise Temperature Control ±±±± 0.5°°°°C

• Better Humidity Control

• Individual Room Comfort Control

• Superior Aesthetics & Prestige

Fixed Speed Systems Do Not Match Load

Requirements

-20 -10 0 10 20 30 40

Inadequate Heating

Inadequate Cooling

Ambient Temperature (o C)

Compressor Output

CompressorCycling

(Inefficient)

Heating CoolingHeating Cooling

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Modulated Compressor Matches Supply & DemandModulated Compressor Matches Supply & Demand

-20 -10 0 10 20 30 40

• Capacity Matches Load• Energy Savings• High Comfort

Ambient Temperature (o C)

Compressor Output Inverter 40% - 100%

Digital Scroll 10% - 100%

Heating CoolingHeating Cooling

Emerson Climate TechnologiesPowering The Leading Air Conditioning Systems

Energy Saving

Reliability

Human Comfort

Flexibility

Digital Scroll Technology

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

Outdoor Unit Multiple Indoor Units

Communication

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Modulation MechanismModulation MechanismModulation MechanismModulation Mechanism

8 Sec

Full

Capacity

Zero

Capacity

Zero

Capacity

Full

Capacity

5 Sec

5 Sec

Ex: 20% Output Ex: 50% Output

Loaded (1) Unloaded (0)

Full Capacity Zero Capacity

2 Sec

1.0 mm Scroll

Separation

Seamless Capacity DeliveryCapacity = (Loaded Time x 100% + Unloaded Time x 0%)

Total Time

Example: Cycle Time = 10 Seconds

Capacity Loaded Time

10% 1.0 Second11% 1.1 Second12% 1.2 Second……25% 2.5 Second…50% 5.0 Seconds…90% 9.0 Seconds

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Part Load Function Of Digital VRF 12 HP Example

Part Load %

Sequence Of Compressor Operation

100% (12.0HP) ON : No modulation ( 6HP ) ON ( 6HP)

90% (10.8HP) ON 80% Modulation (4.8HP) ON ( 6HP)

75% (9.0HP) ON 50% Modulation (3.0HP) 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)

5% (0.6HP) ON 10% Modulation (0.6HP) OFF (0HP)

6HP Digital 6HP Fixed

• 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)

Details of Digital VRF System To Replace Existing Multiple Split ACs

Details of Digital VRF System To Replace Existing Multiple Split ACs

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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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