Use of Energy Efficient Electrical Appliances

K. Irosha S. Fernando

Director (Households, Agro and SME Sectors)

Sri Lanka Sustainable Energy Authority (SLSEA)

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What is Energy Efficiency?

Energy Efficiency = 𝑂𝑢𝑡𝑝𝑢𝑡 𝑠𝑒𝑟𝑣𝑖𝑐𝑒

𝐸𝑛𝑒𝑟𝑔𝑦 𝑖𝑛𝑝𝑢𝑡

Energy Efficient product consumes less energythan not so efficient products to produce the sameoutput.

What is an Energy Efficient product ?

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Reduce electricity bill

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Sector-wise Electricity Consumption

Source: Energy Balance, 2018

Domestic37%

Religious1%

Industrial 33%

Commercial28%

Street Lighting

1%

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Domestic AppliancesDomestic appliances commonly used

✓ Lamp✓ Fan

✓ Air conditioner

✓ Coolers/heater

✓ Refrigerator

✓ Rice cooker

✓ Washing machine

✓ Electric kettle

✓ Water pump

✓ Geyser

✓ Blender

✓ Iron

For providing illumination and thermal comfort

Reduce use of these equipment by passive design strategies of the building

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Use energy efficient

appliances

Reduced electricity billUse energy

consuming appliances efficiently

To be done at thepoint of purchasing

How to reduce electricity bill

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Benefit of choosing energy efficient appliances

▪ Typical example:Comparison of operating cost and total cost of threerefrigerators of volume 240 litres each with differentenergy efficiencies.

▪ AssumptionsLife time of the appliance 15 years;Unit electricity cost Rs. 17.00

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Benefit of choosing energy efficient appliances (Contd.)Description Refrigerator

1 Refrigerator

2Refrigerator

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Initial cost (Rs) 73,000 76,000 84,000

Daily energy consumption (kWh)

1.9 1.7 0.9

Monthly Energy consumption (kWh)

57.0 51.0 27.0

Energy consumption during life time (kwh)

10,260 9,180 4,860

Operational cost for life time (Rs)

174,420 155,720 82,620

Total cost (Rs) 247,420 231,720 166,620

Life Cycle Cost Analysis

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Graphical representation

Rs. 80,800

Rs. 65,100

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How to identify energy efficient appliance during purchasing

▪ Brand popularity

▪ Lowest price

▪ More promotions

▪ Discounts

▪ Advice from a friend

▪ Energy Efficiency

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How can I identify energy efficient products in the market?

Energy label provides guidance to the customer to make correct purchase decisions.

It is a tool used worldwide to display the energyefficiency and consumption data accurately and insimple manner in order to enhance awareness of theconsumer about the energy performance of the productwhich helps him/her to make correct purchasedecisions.

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Appliances with Energy Labels

Compact Fluorescent LampsReference Standard: SLS 1225:2016

Ceiling FansReference Standard: SLS 1600:2011

LED LampsReference Standard: SLS 1530:2016

ComputersReference Standard: SLS 1580:2018

Domestic RefrigeratorsReference Standard: SLS 1690:2020

Energy label- Compact Fluorescent Lamp

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Number of stars

Energy consumption per month at the average speedBrand name of the

fan, model numbers of the fan and regulator

Energy label- Ceiling Fan

Power consumption at maximum, minimum and average speeds

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Minimum Energy Performance (MEP) label– LED Lamp

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Minimum Energy Performance (MEP) label– Computer

(a) - Refrigerant used(b) - Global warming potential of the refrigerant

which is given by kilograms of CO2

equivalent (CO2 eq)(c) - Ozone depletion potential of the

refrigerant which is given by R11eq

(d) - Refrigerator brand(e) - Model number of the refrigerator

(a)(b) (c)

(d)

(e)

Energy performance (monthly energy use per 100 litres of volumeAverage

measured power

Monthly energy use in kWh/month

Minimum Energy Performance (MEP) label– Refrigerator

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Voluntary programme

❑ Computers and Refrigerators.

❑ Minimum Energy performance levels declared.

❑ MEP label.

❑ Make mandate with time.

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r

Year

Compact fluorescent lamp (CFL)

Ceiling fan

Fluorescent lamp ballast

Tubular fluorescent lamp

Refrigerator

LED Lamp

Electric motor

Appliances addressed so far ... 2

00

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Computer

Room a/c

Room a/cLED Panel light

Water pump, Rice cooker,TV

Regulations

❑ Mandatory requirements

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- ban manufacture, import, store, sales anddistribution of CFLs not conforming with thestandards.

- energy label appearing on the container of the product.

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❑ Gazettes published so far

Extraordinary Gazette No.1611/10 of the Democratic Socialist Republic of

Sri Lanka dated 22nd July 2009

Extraordinary Gazette No.1794/15 of the Democratic Socialist Republic of

Sri Lanka dated 22nd January 2013

Extraordinary Gazette No.1971/13 of the Democratic Socialist Republic of

Sri Lanka dated 15th June 2016

Extraordinary Gazette No.2177/3 of the Democratic Socialist Republic of

Sri Lanka dated 26th May 2020

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More recommendation for selecting appliances

▪ Select the capacity as to match the requirement.

▪ Go for products with energy efficient technologies;

eg. Inverter technology, brushless D.C. motors, ….

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Use appliances efficiently

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Energy balance of a typical household

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Tips for efficient use of Refrigerator

❑ Avoid external heat gain.

❑ Keep an air space between refrigerator and a wall.

❑ Maintain proper inside air circulation.

❑ Clean condenser unit properly and regularly.

❑ Minimize door opening as much as possible.

❑ Fix door screen.

❑ Replace damaged rubber beading so that the door is properly sealed.

FEVER

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Tips for efficient use of Iron

❑ Quickly folding or hanging cloths after drying will reduce the need for ironing touch-ups.

❑ Ironing low temperature fabric first, then move on to heavier material clothing.

❑ Check and wipe the face of iron. Clean and smooth face will ensure quicker and easier ironing.

❑ If you use a steam iron, check for mineral deposits and clean them before ironing. These can cause brown spotting.

❑ Avoid idling losses.

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Tips for efficient use of Fan

❑ Use pedestal fans as much as possible.

❑ Pedestal fans are energy efficient than

ceiling fans.

❑ For areas where ceiling height is much high go for

pedestal fans or wall fans.

❑ Keep about 2.5 ft. from the level of the ceiling to the fan

blades.

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Tips for efficient use of Television

❑ Switch off the TV at main switch. Standby loss may differ

from 10 W – 22 W.

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kW × 𝑁𝑜. 𝑜𝑓 ℎ𝑜𝑢𝑟𝑠 = 𝑘𝑊ℎ(Units)

Electrical Energy and Units

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Estimating Energy consumption

Appliance Wattage (W) No. of units

Operting

hours per day

(hours)

Operating

days per

month (days)

Monthly

consumption

(kWh)LED Lamps 11 3 5 30 5.0

CFL 15 5 5 30 11.3

Rerfrigerator 110 1 18 30 59.4

Ceiling Fan 75 8 2 30 36.0

Pedestal Fan 50 1 5 20 5.0

Electric kettle 1000 1 0.2 8 1.6

Iron 1000 1 0.5 8 4.0

Water pump 75 1 1 30 2.3

….......

….......

….......

….......

124.5 Total

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Domestic purpose Tariff

Source: https://www.ceb.lk/commercial-tariff/en

Time of use electricity tariff for domestic consumers does also exist.

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Calculation of Monthly Electricity Cost

Range of units Unit price Cost (Rs.)

0 - 60 7.85 471.00

61 - 90 10.00 400.00

91 - 120 27.75 832.50

121 - 124 32.00 128.00

Fixed charge 480.00

Total 2311.50

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If we can keep not operating one ceiling fan and reduce the use of lamps from one hour each

Avoided electricity units = 21.2 units/monthNew consumption = ( 124.5 – 21.2) units

= 103.2 units

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Monthly Electricity Cost

Range of units

Unit price Cost (Rs.) New cost (Rs.)

0 - 60 7.85 471.00 471.00

61 - 90 10.00 400.00 400.00

91 - 120 27.75 832.50 360.75

121 - 124 32.00 128.00 -

Fixed charge 480.00 480.00

Total 2311 1712

Thank You

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