Energy Conservation Evaluation through Energy Audit at Building
on Green Campus of Universitas Negeri Semarang: Case Study on
Prof. Dr. Retno Sriningsih Satmoko Building
Sunardiyo Said
1,2
, Purwanto
1,3
and Hermawan
1,2
1
Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia
2
Department of Electrical Engineering Faculty of Engineering Semarang State University Semarang Indonesia
3
Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia
Keywords: Energy Consumption, Energy Audit, Green Campus.
Abstract: The high consumption of electrical energy in the college of higher education, making the greater effort to do
energy conservation in the campus environment. For that campus undertake a program of decreasing electrical
energy consumption through energy management program, where one of them is energy audit. Energy audit
conducted in this research is an energy audit in building Research Institute and Community Service / Prof.
Dr. Retno Sriningsih Satmoko building of Universitas Negeri Semarang. The energy audit starts with the
collection and processing of historical data on building energy consumption, then calculates the Energy Usage
Intensity (EUI). The number of rooms in the Prof. Dr. Retno Srininsih Satmoko Building which EUI value
into the wasteful category as much as 12 rooms, with the result of energy savings opportunities obtained for
IDR. 65.200.882. Based on measurements of Prof. Dr. Retno Sriningsih Satmoko building air governance in
the comfort category. Energy audit results need to be followed up by university managers to conserve energy.
1 INTRODUCTION
The reduction of energy consumption in green
campus is a priority. This is linked to the high costs
that the university pays. On the other hand, it is the
responsibility of the college of higher education as a
pioneer of sustainable environment to answer the
challenges of global warming. The UI Green Metric
ranking provides a requirement for participants to
comply with the Energy and Climate Change criteria,
in which there are indicators of the application of
energy efficiency and electrical indicators used in
years (UIGM, 2017). Hongwei Tan, et. al (2014)
conclude that development of energy and resource
efficient campus has been expanded in a large scale
in China, mainly aiming at the energy efficient
technology application and campus energy
management, and all these initiatives are strongly
promoted by the national government with policy
support and financial funding. Building Prof. Dr.
Retno Sriningsih Satmoko is a building has a high
enough activity because as a place of administrative
center of research activities and community service.
All teachers often visit this place therefore need a safe
and convenient service. Building electrical appliances
work in full ie lighting, air conditioner, photocopy
machine, LCD projector, computer, water pump, and
others. Prof. Dr. Retno Sriningsih Satmoko building
has a building area of 6000 m2 consists of 3 floors
each of which has an area of 2000 m2 per floor. In
electric system have dual power that is electricity
from PLN and 2 Genset as electricity reserve when
there is blackout Genset have capacity of 400 KVA
and 200 KVA per generator and capacity of MCB 315
A. Electrical system from PLN that supply tariff of
S3K with power installed 1385 KVA and Trafindo
transformer capacity of 1000 KVA. The building's
transportation system utilizes lifts and ladders. For
Elevator that serves as emergency when power
outages, lift disupplay electric power from 8 pieces
accumulator 14.9 v / acumulator. In the irrigation
system (water pump) has 3 pumps with different
types, first, the submersible pump '' Grudfos” pump
with a power capacity of 1.5 KW which serves as a
water pump from a large scale water storage tub to the
building tandon. Second, 2 pumps type Deepwell
Pump 'Grudfos' 1.1 KW which serves as a water
pumper from the well to the tandon of large-scale
Said, S., Purwanto, . and Hermawan, .
Energy Conservation Evaluation through Energy Audit at Building on Green Campus of Universitas Negeri Semarang: Case Study on Prof. Dr. Retno Sriningsih Satmoko Building.
DOI: 10.5220/0009011203490353
In Proceedings of the 7th Engineering International Conference on Education, Concept and Application on Green Technology (EIC 2018), pages 349-353
ISBN: 978-989-758-411-4
Copyright
c
 2020 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved
349

water storage. Also has a solar panel system with 6
pieces of solar panel outside the building size 40 cm
x 30 cm. There are 8 accumulators (batteries) with
storage capacity 200 Ah / 12 V per accumulator
(battery). 1 Inverter DC-AC with a voltage of 48 V.
There is a system of fire extinguisher (free hydrant),
Air conditioning system (air conditioning), CCTV
(Close Circuit Television) and the central telephone.
Figure 1: Location of the Prof. Dr. Retno Sriningsih
Satmoko building.
Figure 2. Front look of Prof. Dr. Retno Sriningsih Satmoko
Building.
2 METHODS
This research is designed using a "research and
development" approach that is a program that begins
a research needs analysis, then developed a
development program and test its effectiveness
(Sugiyono, 2006). The method of collecting data uses
the following techniques: a. Observation technique
used to take (1) PLN electricity bill data, (2) total
building area, and (3) building specifications. b.
Direct Measurement Technique, will be used in
retrieving data through measurement of illumination,
temperature, humidity, voltage, current, and
electrical power in each building panel on the RST
phase.
3 RESULT
Table 1: SpEUIfication of the building.
a. Building name
Prof. Dr. Retno Sriningsih
Satmoko
b. Building area
First floor = 2000 m
2
Second floor = 2000 m
2
Third floor = 2000 m
2
c. Number of floors 3
d. Brand Trafo Trafindo
e. Voltage 220-380 V
f. Trafo Capacity 1000 KVA
g. Genset (backup) 200 KVA / MCB 315 A
h. Power 1385
i. ID. Customer 523530250393
j
. rate Group S3K
Table 2: Energy Consumption per month 2017.
Month
Number of
Electricity (kWh)
January 16.294
February 18.816
March 12.176
April 17.888
May 15.584
Juny 11.440
July 17.136
August 13.504
September 10.768
October 18.608
November 15.616
December 18.868
Total 186.694
Table 3: Daily electrical load (KWh).
Measurement Time
Day 07.00-18.00 11.00-12.00 14.30-15.30
Monday 16,401 19,520 16,621
Tuesday 17,641 20,298 17,555
Wednesday 18,994 22,215 14,808
Thursday 17,878 21,332 12,571
Friday 12,604 18,409 16,004
EIC 2018 - The 7th Engineering International Conference (EIC), Engineering International Conference on Education, Concept and
Application on Green Technology
350

Figure 3: Daily electrical load.
Table 1 shows the SpEUIfication of the building.
Energy Consumption per month in 2017 is appeared
in Table 2. Table 3, shows that the largest average use
of energy during the day due to high work activity and
the use of electrical equipment to the maximum.
The results of the measurement of the intensity of
energy consumption in Prof. Dr. Retno Sriningsih
Satmoko building shows that there are 12 rooms of 38
rooms which are wasteful of electric energy
consumption so it is important that the AC energy
efficiency program is to replace the old air conditioner
with environmentally friendly AC inverter, room
temperature setting and life time regulation.
Measurement of the strong level of illumination in each
room of Prof. Dr. Retno Sriningsih Satmoko building
done at 7.00-16.00 hours (working hours) is described
as follows Figure 3.
Seen that most of the room there is less and there
is more than the strong standard of illumination SNI
6197: 2011.
From the measurement of Prof. Dr. Retno
Sriningsih Satmoko building temperature, it is known
that the average temperature and humidity in the air
system is temperature + 28
o
C and humidity + 73 %.
In SNI 6390: 2011 for highland or mountain areas
with an average maximum air temperature of about
28
o
C DB and 24
o
C WB or less (or an average
temperature of 23
o
C or less), generally no artificial
air conditioning is required. Means that the air system
in the Prof. Dr. Retno Sriningsih Satmoko building is
not needed artificial air conditioning because it is
included in the highland or mountainous areas, the
achievement of thermal comfort and the availability
of clean air is entirely charged to the optimization of
the architecture design passively.
To determine the potential energy savings
opportunities that can be applied to a room that is not
categorized as efficient in using electricity, then the
difference in EUI value calculated with the standard
EUI value must first be calculated. To calculate the
energy saving opportunities that can be applied to a
room can be used the following that is:
Energy Saving opportunities = EUI x total area of
space x electricity rates divided by 12 months
The electricity tariff used to calculate the energy
savings opportunities in this study is adjusted with
the basic electricity tariff the Prof. Dr. Retno
Sriningsih Satmoko building is Rp. 16,168,-. The
following table will show the calculation of EUI and
energy saving opportunities in each room of Prof. Dr.
Retno Sriningsih Satmoko building. The efficient
EUI standard for air-conditioned buildings is 7.93
KWh / m
2
/month whereas the efficient EUI Standard
building is not air conditioned ie 0.84 KWh / m
2
/
month. Energy savings opportunities of LP2M
building are presented in the following Table 5.
Table 5: Results of calculate saving opportunities Prof. Dr.
Retno Sriningsih Satmoko building.
No Room
Calculation energy saving
opportuities
Results IDR
1
Conservation
Office (CO)
(34,76-7,93)*48*16168 20.821.797
2 Head of CO (34,42-7,93)*9*16168 3854612
3 Staff PBB (6,25-0,84)*61,7*16168 5.396.830
4 FKPMN (22,07-7,93)*30*16168 6.858.465
5 Head of KKN (21,15-7,93)*16,5*16168 3.526.725
6 R. Admin (12,44-0,84)*7,5*16168 1.406.616
7 R. Sek. BPM (16,35-7,93)*18*16168 2.450.422
8 R. Conference (16,35-7,93)*13,5*16168 1.837.816
9 Guest BPM (4,82-0,84)*13,5*16168 868.706
10
R. Penjamin
Mutu
(51,64-7,93)*17,5*16168 12.367.307
11
Head Office
Admin
(22,12-7,93)*15*16168 3.441.358
12 R. 307 (22,59-7,93)*10*16168
2.370.222
4 CONCLUSIONS
The result of EUI calculation was found in Prof. Dr.
Retno Sriningsih Satmoko building EUI value 31,65
KWh / m2 / year while for EUI value standard equal
to 240 KWh / m2 / year hence building of Prof. Dr.
Retno Sriningsih Satmoko buildings into the category
of efficients buildings
The number of 38 Prof. Dr. Retno Sriningsih
Satmoko building rooms that were evaluated was 26
rooms which were categorized as efficient while there
were still 12 rooms that were not in the efficient
category. The number of rooms in the Prof. Dr. Retno
0
5.000
10.000
15.000
20.000
25.000
dailyelectricalload(kWh)
07.00‐08.00
11.00‐12.00
14.30‐15.30
Energy Conservation Evaluation through Energy Audit at Building on Green Campus of Universitas Negeri Semarang: Case Study on Prof.
Dr. Retno Sriningsih Satmoko Building
351

Sriningsih Satmoko Building which EUI value into
the extravagant category as much as 12 rooms, with
the result of energy savings opportunities obtained for
IDR 65.200.882,-.The energy audit of a building can
be a strategic step for energy efficiency and
conservation. The lower consumption of electrical
energy will reduce greenhouse emissions so
environmentally friendly. Energy audits in the Prof.
Dr. Retno Sriningsih Satmoko building can
contribute to a sustainable university, especially
providing a good value for the UI green metric
ranking for universities.
REFERENCES
ASEAN-USAID.1992. Building Energy Conservation
Project. ASEAN-LAWRENCE Barkeley Laboratory
Badan Standarisasi Nasional. 2011. Prosedure Audit
Energi pada Bangunan Gedung, Konservasi Energi
Sistem Tata Udara pada Bangunan Gedung dan
Konservasi Energi Sistem Pencahayaan Bangunan
Gedung (SNI 6196: 2011., SNI 6390:2011., SNI
6197:2011)
EECHI, 2011. Efisiensi dan Konservasi Energi di
Indonesia, Direktorat Jenederal Energi Baru
Terbarukan dan Konservasi Energi Kementrian Energi
dan Sumber Daya Mineral RI. Jakarta
Hongwei Tan, Shuqin Chen, Qian Shi, Lingling Wang,
2014. Development of Green Campus in China. Journal
of Cleaner Production, Vol 64 (2014), pp 646-653)
M. Abdul Raqib. 2018. Audit dan Konservasi Energi Pada
Gedung H dan Gedung LP2M Unnes. Skripsi (tidak
dipublikasikan)
SNI 03-6390-2011. Konservasi Energi Sistem Tata Udara
Pada Bangunan Gedung.
SNI 03-6197-2000. Konservasi Energi Pada Sistem
Pencahayaan
UI GreenMetrik, 2017. Criteria & Indicator.
Greenmetric.ui.ac.id
APPENDIX
Figure 4: Result measurement level illumination each room of building.
0
100
200
300
400
500
600
700
levelofillumination
lux‐measurement lux‐standard
EIC 2018 - The 7th Engineering International Conference (EIC), Engineering International Conference on Education, Concept and
Application on Green Technology
352

Figure 5: Result measurement of the air system each room of building.
0
10
20
30
40
50
60
70
80
90
100
R.Konservasi
ToiletkananPr
Musholla1
R.StaffBPB
R.PusatKKN
R.Musholapusatkkn
R.GugusPengembanganJurnal
usaha
R.Pertemuan(BPM)
ToiletkananLK
R.Sek.BPM
R.ToiletBPM
R.PenjaminMutuLP2M
R.PanelLt.2
Masyarakat
Hidup
ToiletKananPr
R.309
ToiletKananLK
R.Transit
R.Borobudur
R.305 R.303 R.301
themeasurementresultoftheairsystem
temperaturoC
humidity%
Energy Conservation Evaluation through Energy Audit at Building on Green Campus of Universitas Negeri Semarang: Case Study on Prof.
Dr. Retno Sriningsih Satmoko Building
353