Power Engineering

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Browsing Power Engineering by Author "Azeb, Yosef"

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    Energy Audit and Conservation improvement for Textile industries Case Study at Yirgalem Addis Textile Factory
    (AAU, 2018-04) Azeb, Yosef; Getachew, Bekele (PhD)
    Energy conservation is an essential step towards overcoming the problem of energy crisis and environmental degradation. Textile industry comprises a large number of plants which all together consume a significant amount of energy. Improving energy efficiency should be a primary concern for textile plants. Even the available cost-effective options for energy- efficiency often are not implemented in textile plants mostly because of limited information on how to implement energy-efficiency measures. Yirgalem Addis Textile Factory PLC (former Adei Ababa Yarn factory) is one of the oldest textile factories in Ethiopia, which has more than 50 years experience in spinning, knitting, weaving, dyeing, garments and blanket activities. The long time service given by the different electrical units within the factory would entail wear-out and therefore would be good area for energy conservation opportunities. Thus, the main purpose of this study is to assess the energy conservation and or efficiency and to suggest energy efficient technologies for yirgalem Addis textile industry as case study. The study can be applicable for other similar industries in the country and elsewhere. The major objective of the study is to provide a comprehensive overview of the present energy management strategies in the industry, and identifying energy conservation opportunities so as to come up with solutions to improve the efficiency of the current energy utilization of the plant. In this thesis work both primary and secondary data has been used for energy loss review and to identify the areas for possible improvements in energy utilization. The collected data has been analyzed and feasible energy conservation improvement opportunities both for electrical energy as well as fuel energy which can be applied in this sector are identified and recommendations to minimize energy consumption without affecting quality and productivity are formulated. The findings reveal that a bulk of the energy in the industry is wasted due to utilization of low efficiency equipments. Based on the motor analysis it was found that by replacing 38 very old, rewound more than two times and standard motors with energy efficient motors the factory can save 405,028kWh, with average payback period of 2.93yrs. By improving of the installation of lighting system and by replacing existing lighting fixtures with energy efficient lighting technologies the factory can save 107,328.82kWh of electric energy per year, resulting into total saving in electricity bill of USD 2583.94$/yr. It was found that by increasing the boiler efficiency to the acceptable range through establishing regular maintenance and insulation of boiler surface and insulation of steam pipes the factory can save 20% of its fuel cost. Implementation of efficient energy management programs, replacing rewound, old and standard efficiency motors with energy efficient ones; use of power factor correction, use of energy efficient lighting technologies and removing unnecessary lighting fixtures; establishing adequate maintenance program, proper insulation of boiler surface and steam pipes, replacing of failed valves and steam traps are the major strategies recommended in this thesis to achieve improved energy efficiency levels.