Energy Audit and Power Quality Improvement in Debre Berhan Blanket Factory
No Thumbnail Available
Date
2020-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Adequate and reliable supply of energy is essential to ensure maintainable development of any
country. However, the use and conversion of primary energy results in energy waste, high cost
energy and emission. In addition, developing countries, like Ethiopia, have low consciousness
on energy conservation and faced to generate more energy rather than to use the existing energy
efficiently. This thesis studies on energy audit and power quality related issues in Debre Berhan
Blanket Factory.
A detailed assessment of energy consumption and loss has been analysed. Based on the losses,
energy efficiency assessments on the major energy intensive equipment’s like electric motors,
air compressors, boilers, and lightings have been done.
It has been found from energy audit results that there exists a difference of 3.14 kWh/kg
average electric energy intensity between the benchmarks and what exists at Debre Berhan
Blanket Factory; the factory spends US $ 17,475.55 per year on this account. Using Motor
Master + International software it has been seen that some under loaded motors has been
replaced with proper sized motors and energy efficient motors. This brings energy savings of
120,265.00 kWh per year and money savings of US $ 8545.00 per year with some payback
year ranging from 1.52 to 6.29 years. Also through improving, the lighting systems resulted in
money savings of US $ 2644.81 annually. Moreover, a similar analysis is taken for air
compressor that result in energy saving of 72,536.76 kWh, and money saving of US $ 1552.27
annually and, for a boiler, fuel oil saving of 2197.52 Lit and a money saving of US $ 1,302.23
per year with almost zero or negligible pay back periods.
In addition, measurements and simulations have been made to assess power quality related
problems of the factory. Moreover, a comparison of the measured values with standards is
made which shows that the current harmonic pollution was found out of the standard limit.
This thesis also presents the design of passive filters to reduce the current harmonics produced
by non-linear loads in the factory. MATLAB/Simulink software has been used for the
simulation purpose with and without installation of filters. As a result, all the harmonic
distortion levels the 3
rd
th
, 5
th
, and the 7
are reduced from 3.18% to 0.15%, 15.84% to 0.06%,
and 16.28% to 0.03% respectively. Moreover, the current total harmonic distortion THDI
reduces from 22.94% to 0.16% values.
Description
Keywords
Energy Audit, Energy Assessment, Power Quality, Harmonic Filter, MATLAB Simulation