Experiment – No. 1
Calculation of Energy performance Index (EPI) of a building
Aim: To calculate the Energy Performance Index (EPI) of a building and compare with energy
standard building
Apparatus required:
•
•
•
Energy meter - 1 No.
Typical load set up of a consumer
Measuring tape
Theory:
Energy performance index (EPI) is used around the world to evaluate and monitor residential
and commercial building energy performance during design, construction, renovation, and operation.
The two most common indices are Asset Ratings and Operational Ratings. Asset Ratings are based
on modeled energy use with uniform conditions of climate, schedules, plug loads, occupancy, and
energy management. Operational Ratings are based on measured energy use, often normalized for
relevant variables like climate and level of energy service.
The main aim of this experiment is to find out EPI (Kwh/m2/Year) of a typical load of a
consumer and to find out the various ways of decreasing the EPI value without decreasing the comfort
levels of a consumer.
EPI Vs Star rating values of a building:
EPI (kwh/m2 /year)
Star Label
190-165
1 Star
165-140
2 Star
140-115
3 Star
115-90
4 Star
Below 90
5 Star
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Procedure:
To identify the significance of the Energy Performance Index (EPI) value of the building two cases
can be analyzed with a building fitted with normal loads & non-compliance green building materials
versus a building fitted with energy efficient appliances and green building materials.
Case I: Normal Building:
1. Take the readings of power consumption of normal building for 1/2-hour duration.
2. Calculate the reading for 12 hours and another 12 hours with 0.6 multiplying factor as shown
in table I.
3. Calculate the above final value for 365 days as shown in Table I.
4. Now measure the room area in m2 with measuring tape.
5. Calculate the EPI value of normal building as shown in Table I.
Table I:
Power
consumption
for 1/2 Hr.
(1)
Kwh
Reading of
Reading of
(1) X 12 hrs. (1) X 12 hrs.
X 0.6
(2)
(3)
Kwh
Kwh
(2) + (3) X
365
Room area
in m2
EPI
(4) ÷ (5)
(4)
Kwh
(5)
Sq.m
(6)
Kwh/Sq.m/year
Case II: Energy efficient Building:
1. Take the readings of power consumption of normal building for 1/2-hour duration.
2. Calculate the reading for 12 hours and another 12 hours with 0.6 multiplying factor as shown
in table II.
3. Calculate the above final value for 365 days as shown in Table II.
4. Now measure the room area in m2 with measuring tape.
5. Calculate the EPI value of normal building as shown in Table II.
Table II:
Power
consumption
for 1/2 Hr.
(1)
Kwh
Reading of
Reading of
(1) X 12 hrs. (1) X 12 hrs.
X 0.6
(2)
(3)
Kwh
Kwh
(2) + (3) X
365
Room area
in m2
EPI
(4) ÷ (5)
(4)
Kwh
(5)
Sq.m
(6)
Kwh/Sq.m/year
Calculations & Analysis:
Analyze the results from Table I and Table II
EPI of the normal building:
EPI of the Energy efficiency of the building:
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Analysis: Analyze both the cases as per the observations from the experiment
Tabulate the improvements/procedures to make the building to a 5-star rated building without
compromising the comfort levels of the consumer.
Result:
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Experiment No. 2
Identifying various parameters and calculation of HT consumer
Electricity bill
Aim: To identify the various parameters in HT tariff such as KWH, KVA, KVARH, MD and
calculation of HT consumer electricity bill.
Information required: HT consumer electricity bill
From above HT consumer bill, the following parameters to be observed:
-
HT consumer: Voltage of High Tension is 11 KV
Energy meter is attached to HT side: To minimize the CT rating and not to tamper the meter
from consumers.
- Contract demand: 547.78 KVA. [ as indicated in bill ]
o Contract demand register (kW or kVA). This is the maximum power value, usually the
average of 15 minutes, reached during the billing period (this average time may vary
depending on the country). Once the value is higher than the contracted power, the customer
will pay a penalty on the electricity bill.
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o Kwh reading: The kilowatt-hour (kWh, also kW⋅h or kW h) is a unit of energy equal to 3600
kilojoules (3.6 megajoules). The kilowatt-hour is commonly used as a billing unit for energy
delivered to consumers by electric utilities.
- Time of Day (or TOD) tariff is a tariff structure in which different rates are applicable for use
of electricity at different time of the day. It means the cost of using 1 unit of electricity will
be different in mornings, noon, evening and nights. Here, to encourage the consumer to use
the electricity at mid night hours, each unit will be charged at 0.20 paise and it will be deducted
from main tariff.
Calculation procedure of HT consumer Tariff (bill) [ with the above bill]:
S.N. Parameters
1
Colony load
Reading
0
2
2a)
Net Kwh to bill
Kwh to bill
149600
149600
2c)
TOD tariff
41580
3
Total Kwh
2a) – 2c)
Demand Charge
(kVA)
Unit rate
4.40 / kwh
Final bill
0
5.35 x kwh
(149600)= 800360
0.20 x kwh (41580)
= 8316
Time of day tariff
792044
547.78
250 / kVA should be
109500 but, here
568 x 250
142000
4
Power factor
0.9380
5
Overall drawl
charges
20.0
250 / kVA
5000
6
Meter rent
-
1000
1000
7
Customer charge
250
250
8
9
Net Total
Electricity duty
@8%
On kwh consumption
940294
63363.52
14
19
20
Total Electricity bill
Rebate amount
1003657.52
1003658
9402.94
21
Final Electricity bill
994255.00
792044
0
(8+9)
Remarks
As there is no colony
load and hence it is zero
800360 minus
8316
exceeded to 568
It is above 0.9 and hence
no penalty
547.78 rounded to 548
568 – 548 = 20 kVA
(extra consumption )
As meter provided by
Southco utility and hence
meter rent to be paid
For 11 KV supply,
maintenance charge
It depends on electricity
regulatory decision on
every month due to
power purchase with
extra rate
Rounded
If last month bill paid
before due date, then a
rebate of 10 % offered on
previous month total
electricity bill
[19 – 20 ]
Conclusion: Observed the HT consumer’s electricity bill and calculated the tariff of a particular
month
Energy Management & Auditing Lab, Department of EE, School of Engineering & Technology, GIET University
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Experiment No. 3
Measuring the power factor of 3 – phase induction motor and
procedure for power factor correction
Aim: To measure the power factor of 3-Phase induction motor and to improve the power factor to
the standard power factor value of 0.95
Apparatus required:
Wattmeter – 1 No.
Voltmeter – 1 No.
Ammeter – 1 No.
Power factor meter – 1 No.
Clamp meter – 1 No.
Capacitor – 1 No.
Connecting wires
Theory:
Procedure:
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Experiment No. 4
Preparing an Energy audit report of domestic load
Aim: To prepare an audit report for a domestic load
Procedure for an Audit energy report:
▪
Form
an
Environment
Committee
and
select
audit
team’s
representative of administration, students, parents, teaching and
support staff.
▪
Assign goals, tasks and responsibilities.
▪
Write goals (and outcomes) of the audit E.g. Increase awareness,
change attitudes, link with the curriculum, reduce waste, etc.
▪
Consider resources for the audit – Establish a fund to provide for the
audit, decide on related activities, competitions and events for the
college calendar e.g. Environment Youth Forum, World Environment
Day.
▪
Publicize concept of the environment audit energy, materials and
water.
▪
Each member to obtain all relevant bills and consumption data and
outline scope of audit.
▪
Locate all meters and record waste statistics to establish audit
baseline.
▪
Evaluate the best ways of presenting data.
▪
Teams collaborate to a database of relevant information.
Surveys:
Before auditing the energy profile, the scope for better saving patterns has to
be identified.
•
The following points are suggested under this sector for
energy conservation:
•
Using Compact Fluorescent lamps
•
Using Fluorescent tube light.
•
Using electronic ballasts.
•
Switch off an extra light load.
•
Using light colour paints.
Energy Management & Auditing Lab, Department of EE, School of Engineering & Technology, GIET University
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•
Replacement of old regulators.
•
Location for fixing of lamp.
•
Switching off the loads when not required.
•
Computer monitors stand-by modes.
•
Usage of branded appliances.
Calculations:
The below tables are showing the wattage comparison, life period and
cost of CFL’s and incandescent bulbs in shown below.
COMPARISION OF WATTAGES
ORDINARY LAMPS
CFL LAMP
60W
13W
75W
18W
100W
25W
The following illustrates a cost benefits comparison of ordinary bulb
with the CFL’s
COMPARISION OF COSTS
Factors of comparison
Lamp life
Required No. Of lamps
Cost of lamps/lamp
Cost of Elec. Rs.4.50
Per KWh + cost of lamp
Ordinary Bulb
(100W)
1000hrs
CFL range (11w)
8000hrs
ELECTRONIC BALLASTS:
Cost benefits comparisons between electronic and conventional chokes
(for a period of one year with 10 hours of operating time per day)
Item Description
Power
Energy
Consumption KWh=
4.50
Conventional
Choke
(duplicate)
58W
Conventional
Choke
(ISI marked)
45W
electronic Choke
25w
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ELECTRONIC FAN REGULATOR:
Type of Fans
Cheap quality
fans
ISI Standard
fans
Conventional Regulator
Electronic Regulator
75W
70W
65W
60W
Result & Analysis: compare the analysis and prepare a report for one year
with one-year payback analysis.
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