high efficiency motors_jin

7/31/2019 High Efficiency Motors_Jin

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Southeast Asia network of climate change focal points

Training programme on Energy Efficient technologies for climatechange mitigation in Southeast Asia

Case Studies onElectric Motors


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Objectives of Case Studies

Demonstrate the technical and financial viabilityof installing HEM

To conduct an actual energy use comparisonbetween standard motor and HEM installed at

site under local conditions. To assess the potential energy and cost saving

for the entire plant if all the relevant standard

motors with continuous loading were replacesby equivalent HEMs


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Why are Motor Systems Important

Some 300 million existing systems are in use inindustry, infrastructure, & large buildings

20-30 million new systems installed each year

Repair 60-90 million old systems per year

Load factor 60% average

CO2 emissions 4,300 M t per year

Energy saving potential 20% - 30%

Energy cost saving US$100 146 billion peryear


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Typical Applications Fans

Pumps Compressors

Conveyers

Machine tools


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5

Motors as Part of the System


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Why High Efficiency Motors?

Electric motors responsible for 40% of

global electricity usage Drive pumps, fans, compressors, and many

other mechanical traction equipment

International Energy Agency estimates7% of global electricity demand could besaved by higher energy efficiency motors

HEMs are cost effective solutions


7/32Southeast Asia network of climate change focal points

Standards

Diverging standards and different

classification schemes have been used



A New International Standard

Proposed in 2007 by IEC and introduced

in 2008 for energy classes for electricitymotors

IEC 60034-30 (Ed.1.0): 2008-10 has been

published in October 2008 3 commercial levels of energy efficiency are

defined in IEC 60034-30



Comparison of MEPS



2009 Global development of electric motorstandards

(Source: A+B International 2009)



Standards



Barriers to HEM Penetration

Lack of awareness

Energy expenses are invisible to management hidden in general overhead

Small cost items for enterprise

Low priority among capital investment andoperating objectives

Subsidies on electricity price

First cost vs. long term operating costs Reluctance to change a working process due to

lack of experience



Overcoming Barriers

Mandatory minimum energy performance

standards (MEPS)

Improve access to information andmarket transparency

Labeling schemes, standard harmonization

Financial and non-financial incentives

Training and education

Introduction of energy managementsystems/requirements



An Example of Market Transformation



A Short Video


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Case Study 1 Second largest oil field in China

The total power consumption in the oil field ~ 7 billionkWh 3.11 billion kWh goes to motors

Total quantity of motors with high power consumptionand low efficiency is 14,000

Operating hours 7,200 per year Average price for power 0.45 Yuan per kWH Replacement of standards motors

2 x 22KW, 1 x 30KW, 2 x 37KW, 2 x 45KW, 1 x 55KW

25%

15%60%

Motors >200kW each

The rest

Motors


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Case Study 1

Power consumption before and after the

replacement

Before the replacement After the replacement

Total

Output

(m3

)

Power

(kWh) Total

Output

(m3

)

Power

(kWh)

12,296.8 44,779 12,400 38,869

Unit

consumption

bycalculation

3.64kWh/m3Unit

consumption

by calculation

3.13kWh/m3


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Case Study 1

The output variation is very small (0.83%)

The average power saving rate

4477938869 13.2

44779

Monthly saved power: 5,910 kWh Annually saved power: 5910 * 1270,920 kWh


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Case Study 1

Total investment for motor replacement: 52,500yuan (US$7,600)

Annually saved power (0.46 yuan/kWh)32,600 yuan (US$4,700)

Recovery for investment: 5.25/3.261.61years

The service life of high efficiency motor is 15

years => total gain is 486,000 yuan Total electricity saving potential over 400

million kWh per annum


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Case Study 2 Manufactures medium density fireboard and related

products in Malaysia Estimated annual electricity cost of the manufacturing

facilities is about RM14 million A 10 year old 37 kW rated motor driving the boiler feed

water pump for the manufacturing process


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Case Study 2 Results

Based on operating hours of 4,380 hours per year

The HEM reduced energy consumption by 3.8% Annual energy savings = 6,933 kWh => RM1,456


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Case Study 2 - Results


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Based on RM 0.21/kWhand operating 5000 hoursper year

4 years for RM 6750

( Without Tax Relief )

2.4 year for RM 3922( With Tax relieve )


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Based on life span of 15years

ROI on the motor premium

30% per year with taxrelief15% per year withouttax relief.


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Case Study 2 Savings

Different types of motors installed and

with different efficiencies

Using an average of 3 % increment inHEM efficiency

Annual savings is ~ 420,000kWh ifstandard motors (medium size range) arereplaced with equivalent HEMs.

This equal to a saving of RM88,200 perannum at RM0.21 per kWh.


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Case Study 3

A leading provider of technology and products

enabling people to store, access, and manageinformation (Thailand)

To increase the reliability of the temperaturecontrol system through the redundant operationof Chilled water Pump and Cooling WaterPump to their central air conditioning system.

Two additional 3- phase induction motors,

55kW and 75kW, along with pumps wereinstalled in parallel with the existing systems


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Case Study 3

Application Standard Motor HEM

Full LoadEfficiency

PurchasingPrice ( US $ )

Full LoadEfficiency

PurchasingPrice ( US $ )

Cooling Water Pump( 55kW )

91.5% USD1,575 93.6% USD2,075

Chilled Water Pump( 75kW)

91.8% USD2,250 94.3% USD3,850


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Case Study 3

Application Model kWconsumed

Electricity Cost /Month

Cooling WaterPump (55kW)

Standard Motor 62.7 USD 2,257.20

High Efficiency

Motor

57 USD 2,052.00

Application Model kWconsumed

Electricity Cost /Month

Chilled WaterPump (75kW)

Standard Motor 73.8 USD 2,656.80

High EfficiencyMotor

71.5 USD 2,574.00


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Case Study 3

Application AdditionalInvestments forHEMs (USD)

Electricity CostSaving Per Month(USD )

Payback Periodfor additionalinvestment forHEMs

Chilled WaterPump

USD1,600 USD 82.8 19.3 months

Cooling WaterPump

USD 500 USD 205.2 2.4 months

Cooling Water Pump were overloaded

Chilled water pump motors 95% of rated capacity Monthly operation 720 hours (8,640 per year)

Energy cost = US$ 0.05/kWh


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Conclusion

In most cases, theinvestment cost of

HEMs, in relation tostandard motors, canbe recovered within ashort period


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For further inquiries Contact

[email protected]
mailto:[email protected]:[email protected]

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