Super Market Welikada Kotte Municipal Council

Energy Auditor: Ruwan Wijemanne (B.ScEng.Hons)

Organized By:

Sri Lanka Sustainable Energy Authority Conducted By:

EnerFab Pvt Ltd 20, First Lane, Koswata Road, Nawala

Content

Introduction

History Bill Analyse

Load Profile

Energy Saving Opportunities

Building Introduction Location : Rajagiriya

Description : 4 storied Building, Sheet roof,

Court yard

Usage : 70 Shops, Public Library

Operation : 7.00 am 9.00 pm

Energy Background Grid Electricity and Solar Power are main energy

sources to the building

Bill Scope : Library, Common area (Corridor, Wash

rooms, Outdoor lighting)

Service Provider LECO

Tariff GP2

Monthly Energy Consumption 1,775 kWh

Maximum Demand 11 kVA

Monthly Bill 58,000.00 Rs.

History Bill Analyses Total electricity bill of common area for 14 months

0

2

4

6

8

10

12

14

16

18

20

0

500

1000

1500

2000

2500

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb

Dem

an

d (

kV

A)

En

erg

y (

kW

h)

Energy Demand

History Bill Analyses Time of Use Energy Consumption

0

200

400

600

800

1000

1200

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb

To

U E

nerg

y C

onsum

ption (

kW

h)

Day Peak Off peak

History Bill Analyses

Day 41%

Peak 31%

Off peak 28% Day

42%

Peak 38%

Off peak 20%

Time of Use Energy & Cost Share

Energy

Share

Cost

Share

End User Profile

Utility wise energy consumption

Light 71%

Lift 7%

Pump 1%

Fan 18%

Other 3%

Load Profile Demand and Power Factor Variation

0.500

0.550

0.600

0.650

0.700

0.750

0.800

0.850

0.900

0.950

1.000

0.000

2000.000

4000.000

6000.000

8000.000

10000.000

12000.000

12:1

51

4:1

51

6:1

51

8:1

52

0:1

52

2:1

50

:15

2:1

54

:15

6:1

58

:15

10:1

51

2:1

51

4:1

51

6:1

51

8:1

52

0:1

52

2:1

50

:15

2:1

54

:15

6:1

58

:15

10:1

51

2:1

51

4:1

51

6:1

51

8:1

52

0:1

52

2:1

50

:15

2:1

54

:15

6:1

58

:15

10:1

51

2:1

51

4:1

51

6:1

51

8:1

52

0:1

52

2:1

50

:15

2:1

54

:15

6:1

5

Po

we

r F

ac

tor

Dem

an

d (

VA

)

Time

Aperant Power: Triphasic (VA) Power Factor: Triphasic

Temperature Profile T & RH profile of the library under mechanical ventilation

74

75

76

77

78

79

80

81

82

83

84

28

28.5

29

29.5

30

30.5

31

31.5

0:0

0

1:0

0

2:0

0

3:0

0

4:0

0

5:0

0

6:0

0

7:0

0

8:0

0

9:0

0

10

:00

11:0

0

12:0

0

13:0

0

14:0

0

15:0

0

16:0

0

17:0

0

18:0

0

19:0

0

20:0

0

21:0

0

22:0

0

23:0

0

0:0

0

Re

lati

ve H

um

idit

y (

%)

Tem

pera

ture

(o

C)

Time (25-04-2015)

TEMPERATURE RELATIVE-HUMIDITY

Recommendations Tariff Switching

Switch building tariff to GP1 category from GP2

Recommendation Switch tariff to GP1 category

Energy Saving Potential 0 kWh

Annual energy cost saving 146,000.00 Rs.

Recommendations Power Factor Correction

Building maintain power factor at 0.9 at maximum demand

and recommended to improve power factor

Recommendation Install an automatic capacitor

Monthly Demand Saving

Potential

1.1 kVA

Likely Investment 14,400.00 Rs.

Annual Energy Cost Saving 29,600.00 Rs.

SPP 24 Months

Recommendations Outdoor lighting system

Replace 12 Nos of Metal Halides with 20W LED fittings

Recommendation Replace Metal halides with

30W LED cobra fittings

Monthly Energy Saving

Potential

367 kWh

Likely Investment 156,000.00 Rs.

Annual Energy Cost Saving 84,000.00 Rs.

SPP 22 Months

Recommendations Indoor lighting system

Replace old inefficient T8 tube light fittings with T5 lights

Recommendation Replace T8 Tube lights with

T5 tube lights

Monthly Energy Saving

Potential

276 kWh

Annual Energy Cost Saving 72,000.00 Rs.

Recommendations Solar Net Metering System

Install solar net metering system to generate buildings own

power.

Recommendation Install 15 kWp rooftop solar

net metering system

Monthly Energy Saving

Potential

1,800 kWh

Likely Investment 3,000,000.00 Rs.

Annual Energy Cost Saving 553,500.00 Rs.

SPP 5.4 years

Recommendations General

Shift peak loads to off peak or day

Attach identification name tags for each circuit breaker

Replace damaged solar panels and lamps

Recommendations Summary Total energy saving potential except solar net metering

Parameter Savings Present

Consumption

Saving

Percentage

Energy (kWh) 7,717 21,296 36%

Cost (Rs.) 317,000 698,000 45%

Questions..?

Thank You..!