Energy Conservation in Domestic Sector for Better
Utilization of Power Indian Context
Ramalinga Raju M and Narasimham Dr. SVL
Department of Electrical Engineering, JNT University College of Engineering, Kakinada 533 003,
Andhra Pradesh, India.
Email: rajumanyala@rediffmail.com, Phone: +91 884 2373661 (O)
Abstract: There is a wide gap in the supply and demand of power in India and bridging the gap by installing
new power stations is not going to take place in near future. The other alternative is to conserve every watt of
energy. Energy conservation in domestic sector is a good point to start as about 20% of the total energy
generated is utilized for domestic purpose, which is a considerable share. In this paper Indian electrical
market and domestic power utilization are critically analyzed with respect to cost, efficiency and need and
various methods to conserve the energy are suggested without much investment and sacrifice of comfort.
Keywords: Energy Conservation, Domestic Energy, Power Utilization, Energy Efficiency
1.
INTRODUCTION
Electrical Energy is undisputedly the most vital
element for industrial growth of any country.
India is one of the many developing countries,
which is suffering from acute power shortages.
Almost all the states of India are not able to
manage the demand from the three main sectors,
viz. domestic, agriculture and industrial sectors.
The recent industrial growth due to economic
reforms further worsened the situation. This
results in exhaustion of fossil fuels and causes
ecological imbalance. Various factors including
political pressures resulted in irrational
distribution of the power among the various
sectors, giving higher priority to domestic sector
at the cost of the other two sectors.
Domestic power consumption in India takes about
1/5th of the total power consumption, which is
substantially high. Previously the power was
subsidized in all the states of India and people
(mis)used power liberally without worrying about
efficiency of the appliances. Because of the
economic reforms, the subsidy is being
withdrawn in power sector in a phased manner
throughout India and the power tariff is steadily
increasing and the people began to realize the
need for energy conservation. Even the
Government of India made an act for energy
conservation in 2001, which shows the
seriousness of the power situation. Since domestic
sector use the power in variety of applications,
this is a potential area to be considered for energy
optimization. By reducing the domestic energy
consumption, the other sectors will get more
power thereby helping the country to prosper
further. As a side effect, it improves the
ecological balance (Narasimham, S.V.L, Dr , and
Ramalinga Raju,
M,
2001.)also. In this
connection an analysis is made on the consumers
choice and various measures are suggested in this
paper to improve energy efficiency. Andhra
Pradesh a state of India, which has a population
of about 70 millions, is considered for statistics,
which represent the general conditions of any
other state in India.
2. DOMESTIC POWER CONSUMPTION IN
ANDHRA PRADESH
Andhra pradesh per capita consumption statewide
is 480KWH per annum. Tables1 and 2 show the
growth of domestic consumers and their
connected load in the last 5 years (International
Copper Promotion Council (India), Hand Book,
2001) and consumption pattern of the power in
domestic sector (Chaudhary S.R., 2002.).
Year
No.
of Connected % Growth in
Consumers
connected
Load
load
(Connections) (Mw)
1996-97 6,803,038
3756
1997-98 7,300,553
4028
7.34
1998-99 7,694,653
4246
5.4
1999-00 8,124,786
5039
18.67
2000-01 10,258,475
6327
25.56
Table 1: Growth of domestic consumers &
connected load in Andhra Pradesh
Audio/Video
07
Others
05
Table 2: The consumption pattern of the power in
domestic sector
2.
INDIAN MARKET
Cost is the most crucial factor in consumer
choice. Many times cost supersede quality even
though the equipment is inferior in quality,
inefficient and hazardous. In recent times, quality
awareness is slowly increasing thanks to the multi
national companies for their better quality
products at relatively lower prices. In this regard
various domestic electrical equipment commonly
used in Indian houses are critically analyzed and
alternatives are suggested wherever possible
3.1 Lamps
Incandescent
100W
1.0
100
1200
12.0
Fluorescent
tube
lamp
40W
0.6
52.48
2460
46.87
Fluorescent
tube
lamp
40W
with
electronic
choke
0.98
33.17W
2890
68.0
CFL 15W
0.90
19.6W
900
45.91
Lumens/watt
Heating/Air conditioning 14
Efficiency
12
Output lumens
Refrigeration
(watts)
22
Power
consumption
Fanning
because of its low luminous efficiency. Following
calculation shows how economic to replace
incandescent with
P.F.
%of consumption
40
Type of lamp
Application
Lighting
Table 3: Comparison of various types of lamps
Indian domestic illumination is totally dominated
by the incandescent lamps of varying wattage
(40W/60W/80W/100W).
Despite
their
inefficiency, they are still preferred in lower
income groups just because of their very low
initial cost. Fluorescent lamps are also popular
and are used mainly in the utility areas like
reading rooms, bedrooms and living rooms,
though they are costlier by more than 10 to 15
times than incandescent lamps. Even in the
fluorescent lamps, aluminium chokes are
predominant, which cost much less compared to
copper choke.
Fluorescent Tube Light (FTL) and with CFL. For
calculations it is assumed that the operation hours
are 5 Hours per day and the cost of Energy as
Rupees 3/- per Kwh though it is much higher if
the consumption is more.
In India, about 80 percent of the domestic lighting
is through incandescent lamps. Hence it is one
area that should be concentrated most for
conservation of energy. Nowadays use of CFLs
(Compact Fluorescent Lamp) is steadily
increasing because of their very low power
consumption, long life and better illumination
over incandescent lamps. However CFLs may not
be a replacement when illumination is required
for precision work. Table 4 shows the comparison
of the various popular types of lamps
(Kushare,B..E and Bapat R.B., Energy
Conservation-Demand
side
perspective,
2002.)From table 3, one can observe that the
incandescent lamp is a source for energy wastage
lamp:
100W
Power consumed by FTL:
52.48W
Saving in power:
47.52W
Payback period:
1 year
3.1.1 Replacement with FTL
Cost of FTL with copper choke:
Rs. 275/-
Cost of Incandescent lamp:
Rs. 15/-
Difference in cost:
Rs. 260/-
Power consumed by Incandescent
3.1.2 Replacement with CFL:
Cost of CFL:
Rs. 40/-
Cost of Incandescent lamp:
Rs. 15/-
Difference in cost:
Rs. 25/-
Power consumed by Incandescent
lamp:
100W
Lamp 1: Off
Lamp 2: 40%
Lamp 3: 70%
Sun Light
Work Place
Figure 1. Typical room layout with sun light
3.2 Fans and Regulators
Power consumed by CFL:
19.6W
Saving in power:
80.4W
Payback period:
21 days
In both the cases, it can be observed that the
savings are very impressive and hence
replacement of incandescent lamps is highly
recommended. The payback period is inversely
proportional to the period of usage.
3.1.2 Replacement with CFL
Cost of CFL:
Rs. 40/-
Cost of Incandescent lamp:
Rs. 15/-
Difference in cost:
Rs. 25/-
Power consumed by Incandescent
lamp:
100W
Power consumed by CFL:
19.6W
Saving in power:
80.4W
Payback period:
21 days
In both the cases, it can be observed that the
savings are very impressive and hence
replacement of incandescent lamps is highly
recommended. The payback period is inversely
proportional to the period of usage. Another
method to conserve energy in this area is to use
the natural light effectively so that the period of
usage of lamps may be minimized. Following
figure shows how the daylight can be used to
augment the electrical lighting.
Fans, once a luxury, became essential now for
Indian climatic conditions where temperatures
rise to as high as 450C in summer. In India, fans
available at varying cost ranging from as low as
Rs. 400/- to Rs. 1500/-. Cheap fans normally use
substandard core laminations and aluminium
windings. Standard fans are made with quality
material but cost two to three times. The power
consumption varies from 60Watts to 90Watts
depending on the quality of the fan. Though
electronic regulators are available in the market at
costs ranging from Rs. 50/- to Rs. 250/- (low cost
electronic regulators dont contain proper
shielding to prevent RF interference), the
conventional regulators are predominant chiefly
because they come along with the fan. The user
has no choice for opting for an electronic
regulator. At medium speeds, a saving of about
14Watts was observed with the use of electronic
regulator.
Replacement of low efficient fan with series
regulator with high efficient fan with electronic
regulator is highly recommended. Following is a
comparison of economics of a high cost fan
(HCF) and low cost fan (LCF), at a nominal 8
hours a day.
Cost of HCF with electronic regulator: Rs. 1650/Cost of LCF:
Rs. 450/-
Difference in Cost:
Rs. 1200/-
Power consumption of HCF
At medium speed:
50W
Power Consumption of LCF
At medium speed:
90W
Power savings:
40W
Payback period:
2.3 years
Augmenting the geyser with solar water heater
greatly reduces the power consumption (as much
as 80%) as solar energy is available for more than
10months a year, which raises the temperature to
an adequate level. Following example shows the
cost savings by the use of a solar water heater.
Cost of solar heater (100 Liters): Rs. 8500/-
3.3 Refrigerators
Heat required to raise temperature from 200C to
450C (Ambient to required temperature) for
Refrigerator is another common appliance in
middle and upper classes in India. Single door
refrigerators take a share of more than 80 percent
and almost all are right hinged (operated with
right hand). These are available in variety of
capacities and models, but the most popular
among them is the single door 165 liters capacity.
Almost all the refrigerators have right hinged
doors (operated with right hand). Operation of the
refrigerator with right hand takes longer time
since door opening and handing the contents is to
be done by right hand only. This is particularly
true with cooking items since they are normally
touched with right hand only in India. This leads
to loss of cooling and can be saved to some extent
if a left hinged door is provided.
100 liters :
2500 Kcal
Energy required: 2500/860:
2.906 KWH
Refrigerators in India are mostly used for
preservation of food items and for cold water. If
two separate compartments are provided, there
can be good energy savings since the loss of
cooling due to door opening is confined to that
compartment only. In fact, a tap may be provided
for cold water, which minimizes the openings of
the door by about 60%. Normally, defrosting is
done only when the deep freezer is completely
choked with ice, which hampers the effectiveness
thus making a refrigerator inefficient. Another
common flaw is insufficient space behind the
refrigerator, which deteriorates the heat transfer.
The vendors should educate the consumers to
ensure periodical defrosting and not to place the
refrigerators close to the walls. Now a days No
Frost models are available, which are very
efficient and consume less power than the normal
models.
Energy Required per Annum
(300 days):
872.1 KWH
Savings @ 80% of the
Energy Consumption:
697.7KWH
Savings in Rupees:
Rs. 2093/-
Payback period:
4 years
Apart from the energy savings, the hot water can
be used for other purposes like washing and
cooking during the summer when hot water is not
necessary for bath.
3.5 Water Pumps
Many houses are fitted with a 350W (1/2 HP) or
750W (1 HP) motor depending on the overhead
tank capacity. Most of the motors are controlled
manually and average usage is about two hours a
day. Overflow of tank is a common phenomenon
in India since the use of automatic water level
controllers is not yet popular.and on average there
will be a loss of at least 10 minutes per day per
motor in the form of overflow. An automatic
water level controller is available for about Rs.
500/- to 800/-. The following calculation shows
the savings if an automatic water controller is
installed. Cost of water level controller: 500/Motor rating::
750 W
Energy waste per day
@ 10 minutes of overflow : 125WH
3.4 Water heaters and solar heaters
Payback period:
Immersion heaters, storage geysers and running
water heaters (instant water heaters) are available
in India. Immersion water heaters are the cheapest
and are widely used despite the fatal risk involved
just because of its cost. Solar water heaters are not
available in many places because of their
prohibitively high initial investment. These are
used only in luxury hotels, guesthouses and
cottages, as the Government made it a principle to
install them in these places to conserve energy.
The savings will increase with the increase of the
rating of the motor and the time of overflow. This
also increases the comfort level and conserves the
water resources.
3.6 years
4. CONCLUSIONS
Energy conservation is inevitable and should
become a habit to every citizen. Disciplined usage
of electrical energy saves a considerable amount
to individuals, and considerable power to the
nation, which can be used for industrial growth,
which is currently worst hit sector by the acute
power cuts. Various methods are suggested for
conservation of energy in the domestic sector.
Though Indian context is taken as an example, it
may be applied to every country, which is
suffering from power shortage.
5.
REFERENCES
Anon, The Energy Conservation Act, 2001,
passed by Indian Parliament in August2001, Bill No.21-c of 2000.
Anon, APTRANSCO Ltd., Power Development
in Andhra Pradesh (statistics) Book,
2000-2001.
Anon, International Copper Promotion Council
(India), House Wiring Hand Book, 2001.
Chaudhary S.R.,
Importance of Energy
conservation in the Every Sector, Electrical
India, 11-13, 2002.
Harish Budhlani, Energy Conservation Bill,
2001,salient features, Electrical India, 2629, 2002.
INCAB Cables and Tables, Book by The Indian
Cable Company Ltd.
Kushare,B..E
and
Bapat
R.B.,
Energy
Conservation-Demand
side
perspective,Proceedings
of
National
Conference on Energy Monitoring, India
2002.
Khare, P. N. Energy: Audit and Conservation,
Electrical India, 30-37, 2002.
Narasimham, S.V.L, Dr , and Ramalinga Raju,
M, Energy Conservation for Ecological
Balance, Proc. of International Conference
on Industrial Pollution And Control
Technologies, Hyderabad, India, Vol-III,
1-3, 2001.
Shashi Shekhar, Promoting Energy Efficiency in
India ,Electrical India, 36-37, 2001.
