Power Engineering

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Browsing Power Engineering by Author "Aron, Gidey"

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    Energy Audit and Power Quality Improvement in Debre Berhan Blanket Factory
    (Addis Ababa University, 2020-06) Aron, Gidey; Getachew, Bekele (PhD)
    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.