Energy audit.pdf

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This report contains the energy audit carried out for the Engineers' Quarters of CECB in Defence Head

Quarters Complex Project at Akuregoda. This is a two storied building and 9 Engineers are living in the

house. All of them are working in the designing of Mechanical , Electrical & IT works of the DHQC project.

Normal working hours are from 8.30 AM to 4.15 PM, but depending on the work load most of the time

overtime works are carried out. This building is situated very close by of the site and it's only about 5 min.

walking distance from the accommodation. Therefore a transport medium is not required.

The building has 6 bedrooms, 1 kitchen, 2 living rooms, 3 bathrooms, a dining room, a court yard and a

balcony in total. H.M.D.Bandaranayake , S.M.C.S.Siriwardana & A.R.M.U.E.Abeyrathna are all staying in this

house and collecting data and analyzing the data were done as a group.

Figure 1

Collected data and analyzed data are attached below for the total energy usage of this building.


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( c )

Now let's compare the electricity usage of this house by physical arrangement. That means according to the

places of the house. For that we need to know about how the population is scattered in the house. It'll be as

follows.

Table 3

Location Number of heads

GF - Bedroom 01 1

GF - Bedroom 02 0

UF - Bedroom 01 2

UF - Bedroom 02 2

UF - Bedroom 03 2

UF - Master Bedroom 2

Whole house 9

Now let's check the usage of energy by location of the house.

Table 4

Monthly Energy Distribution of

the Accommodation

Location kWh/Month

GF - Kitchen 68.62

GF - Dining Room 2.40

GF - Living room 0.12

GF - Bedroom 01 28.90

GF - Courtyard 1.80

GF - Bedroom 02 0.00

GF - GF Bath room 4.50

Stair case 1.20

UF - Bath room 3.00

UF - Living Room 31.03

UF - Master

bedroom 24.82UF - Bedroom 01 17.84

UF - Bedroom 02 21.63

UF - Bedroom 03 14.92

UF - Balcony 3.60

Total 224.37


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Chart 2

From the above result we can clearly identify the significant energy using locations of the house. This shows

that kitchen gives the most significant contribution for the electricity usage of the house. Therefore we need

to take action to reduce the electricity usage in the kitchen to reduce the electricity consumption of the

house.

In kitchen, we can switch to alternate energy sources and see whether the result is viable in practical aspect

as well as in financial aspects. For finding the most critical energy using appliances, we need to analyze the

GF - Kitchen, 68.62

GF - Dining

Room, 2.40

GF - Living

room, 0.12GF - Bedroom

01, 28.90

GF - Courtyard, 1.80

GF - Bedroom

02, 0.00GF - GF Bath

room, 4.50Stair case, 1.20

UF - Bath

room, 3.00

UF - LivingRoom, 31.03

UF - Master

bedroom, 24.82

UF - Bedroom

01, 17.84

UF - Bedroom

02, 21.63

UF - Bedroom

03, 14.92 UF - Balcony, 3.60

kWh/Month


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energy usage by each appliance in this house. Below table and the chart shows, how the appliances in the

house uses the electric energy in a month.

Table 5

Energy usage by Equipments

Equipment kWh/month QTY

A/C outdoor unit 0.00 1

Blender 0.00 1

Ceiling fan 58.39 8

CFL bulb 18.42 10

Geyser 0.00 3

Incandescent Bulb 37.50 20

Kettle 31.50 1

Lap top charger 11.24 7

LCD Monitor 1.68 1

Mortein vaporizer 0.89 1

Pedestal fan 0.00 2

Personal Computer 2.10 1

Phone charger 0.63 9

Refrigerator 0.00 1

Rice cooker 26.25 1

Stream iron 25.20 2

Toaster 0.00 1

TV 1.68 1

Wall fan 0.00 1

Washing machine 8.89 1

Window type A/C 0.00 2


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Chart 3

From the above results we can identify the critical appliances in the house and the critical places in the

house, where the maximum amount of energy is used. From the results it is clear that kitchen plays a major

role in the electrical energy utilization in the house & from appliances wise, ceiling fans uses the maximum

percentage of energy.

For energy saving we can use several tips from the above results.

010

20

30 4050

60

A/C out door unit

Blender

Ceiling fan

CFL bulb

Geyser

Incandecent Bulb

Kettle

Lap top charger

LCD Monitor

Mortein vaporizer

Pedestal fan

Personal Computer

Phone charger

Refrigerator

Rice cooker

Stream iron

Toster

TV

Wall fan

Washin machine

Window type A/C

0.00

0.00 58.39

18.42

0.0037.50

31.50

11.24

1.68

0.89

0.00

2.10

0.63

0.0026.25

25.20

0.00

1.68

0.00

8.89

0.00

kWh/month


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First of all let's see how can we reduce the electricity consumption of the kitchen. Rice cooker & Kettle are

the major electricity using components in kitchen. To reduce the electricity usage we can convert to

alternative energy sources.

First we can switch to using LP gas for cooking and boiling water. The equivalent amount of energy required

and the financial benefits will be shown as below. For the calculation purpose we have use the aid of onlinecalculator for CEB tariffs.

Table 6

Replacing of electrical energy by LPG (Use LPG to cook rice & boil water)

Source Consumption Efficiency

Useful

Energy

kWh/month %

kWh

/month

Electricity (used for rice

cooker and kettle)26.25 90 23.63

LP Gas 39.38 60 23.63

Required gas 2.953125 kg

Cost of 13.1 kg gas cyl. 2,434.00 Rs.

Required gas cost 548.70 Rs.

Present current bill 8,211.70 Rs.

Reduced current bill 6,682.90 Rs.

Saving 1,528.80 Rs.

Actual Saving 980.10 Rs.

From this method, actual energy usage in the house will go up, since the efficiency of converting LPG is less.

But from financial point of view it is suitable to move to LPG for cooking Rice and boiling water from

electricity as shown above.

Another point we can develop is to switch to using bio mass or fire wood instead of electricity and gas in the

kitchen. By switching to this mode, it'll not be as same comfort level as before but we have to consider this

option too from the energy saving concept.


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Table 7

Replacing of electrical energy & LPG energy by fuel wood with Anagi Stove

Source Consumption Efficiency Useful Energy

kWh/month % kWh /month

Electricity (used for rice cooker

and kettle)57.75 90 51.98

Gas (used for gas cooker) 174.67 60 104.80

Fuel wood (Anagi stove) 627.10 25 156.78

Energy requirement from fuel

wood150.50 kg

This result shows that we need more than 150 kg of fuel wood per month in order to replace electricity

usage & the LPG usage in the kitchen. From practical aspects this is bit of a hard practice to continue andalso we are using more energy through fuel wood since the efficiency of wood burner is very less.

(Conversion factors and the assumptions regarding this calculation are attached in annex. )

Now let's look at the significant energy using appliances in the house.

From the results it is clear that we are using a significant amount of energy for the ventilation purposes. We

can reduce this amount by using much of the natural ventilation by opening windows and reducing the time

of switching on the ceiling fans. Another thing we can do is to use pedestal fans instead of ceiling fans

because they are using less energy than ceiling fans. Therefore using pedestal fans in the rooms is

recommended and it'll reduce the energy usage by some significant amount. Since we already have two

pedestal fans, it is recommended to use them in Ground floor Bed Room 1 & Upper flow master bed roombecause those rooms use ceiling fans for longer time than any other room.

Next significant energy using category is the lighting. In this category major contribution comes from the

incandescent bulbs and it is more than 50% of total lighting usage. If we can convert into CFL bulbs, we can

reduce this amount of energy too. But we have to consider the initial investment for CFL bulbs also. From

the data collected, it is recommended to replace the incandescent bulbs in the Ground floor bed room 1 &

master bed room in upper flow as soon as possible because they are used for longer time than any other

incandescent bulb in the house. By replacing them we can achieve a significant amount of energy saving.

The next significant equipment is the steam iron. From the data it is shown that we are using the iron for 1

hour almost every day. If we can use the iron efficiently and reduce the amount of time, then we can save

energy from this equipment too.

Here we have rearranged & predict the new energy requirement of the house, after the above

recommendations.


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Figure 2

Figure 3


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Figure 4

Figure 5


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Figure 6

Figure 7


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Figure 8

Figure 9


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Figure 10

Figure 11


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Figure 12

Figure 13


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Figure 14

Figure 15


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Figure 16


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List of Figures

Figure 1 - Accomodation of Engineers ................................................................................................................1

Figure 2 - Electricity bill for month of May ...................................................................................................... 16Figure 3 - Electricity bill for month of June ...................................................................................................... 16

Figure 4 - Name plate of CFL bulb in kitchen ................................................................................................. 107

Figure 5 - Name plate of Incandenscent bulb in GF bath room ..................................................................... 107

Figure 6 - Name plate of steam iron .............................................................................................................. 118

Figure 7 - Name plate of LED TV .................................................................................................................... 118

Figure 8 - Name plate of out door unit AC in UF balcony .............................................................................. 129

Figure 9 - Name plate of a Phone charger ..................................................................................................... 129

Figure 10 - Name plate of a Lap top charger .................................................................................................... 20

Figure 11 - Name plate of Vaporizor ................................................................................................................. 20

Figure 12 - Name plate of a Geyser .................................................................................................................. 21

Figure 13 - Name plate of a CFL bulb ................................................................................................................ 21

Figure 14 - Electricity metes in the house......................................................................................................... 22

Figure 15 - Cooking efficiency of energy sources ............................................................................................. 22

Figure 16 - Theoritical heating values ............................................................................................................... 23


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Collected Data


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Analyzed Data


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Revised Data


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