Browsing by Author "Getachew, Adane"

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    Electrical Energy Audit of Walia Steel Industry
    (Addis Ababa University, 2020-11) Getachew, Adane; Yilma, Tadesse (PhD)
    As the energy demands rise and the pollution levels grow, it becomes imperative to save the energy in all fields in which it is used therefore the subject of energy conservation is a big concern for industries in general and steel industries in particular where energy is intensively used but not properly managed. And when it comes to the energy usage of Walia Steel Industry the inefficient energy usage of the factory can be seen from the average power factor value of 0.48, from its poor monthly average load factor of 31.80%, high specific energy consumptions as compared with international benchmarks, under-loaded motors, transformer, and cable losses, oversized installed capacities of distribution transformers and from the monthly average penalties for maximum demand and power factor which is of 81,564.67ETB. Hence the purpose of this thesis is to address the energy inefficiency problems of the industry through conducting detailed energy audits of the factory and recommend energy conserving measures to alleviate the identified inefficiency reasons for the factory. Accordingly, the energy audit of the major energy-consuming systems of the factory has been done and for the analysis of the audit historical data of energy consumption and production data of 23 months, measurement data of motors, power distribution lines data has been collected for analysis, modeling, and simulation work using motor master+ international and ETAP 16.0.0 software packages. From the detailed audit by replacing the under loaded motors with proper sizes of motors can save 705,210.25ETB annually, and by correcting the power factor of the system and reconfiguring the network the energy loss has decreased by 69.1% and the annual cost saving of 167,690.43ETB can be gained from the avoided loss, from avoided demand charge is of 84,253.80ETB and from the avoided power factor penalty is 2,835,000.00ETB. Finally to mitigate the energy inefficiency of the factory resizing the motors and installing power factor correctors in the power system of the factory has been recommended.
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    prevalence and associated factors of unplanned postoperative admissions to SICU among postoperative adult surgical intensive care unit patients atTikur Anbesa SpecializedTeaching Hospital
    (Addis Ababa University, 2019-11) Getachew, Adane; Alferid, Fetiya(MD, Consultant Anesthesiologist); Shimeles, Rediet(MD, Consultant Anesthesiologist)
    Introduction: Postoperative admission to the intensive care unit (ICU) is commonly planned and regarded as an important component to a safe and effective pathway for prevention, early recognition and timely management of life-threatening complications occurring in the immediate postop period.(1) Frequently, post-operative intensive care Unplanned ICU Admission(UIA) is required in an unplanned manner due to complications related to anesthesia or surgery or underlying illnesses unmasked during procedures.(9) Unplanned ICU admission (UIA) is associated with a negative outcome like increased medical costs, length of hospital stay and mortality(2) and has been shown to be an important safety measure of anesthesia and surgical care.(3) There are currently no data available on Unplanned Intensive Care Admissions in Ethiopia. I undertook this prospective review of postoperative admissions to the Intensive Care Unit of the Tikur Anbesa Specialized Teaching Hospital to know the prevalence and associated factors of unplanned intensive care admissions. Materials and Methods: This prospective cross-sectional study was conducted in the intensive care unit of Tikur Anbesa Specialized Hospital from April to October 2019. A special form was designed and filled for those patients who admitted unplanned to the intensive care within 48 hours of surgical procedures. All patients admitted to the SICU within 48 hours after operation were included. Ward admissions to the ICU (after 48 hours postoperative admission surgery), ICU admissions directly from the emergency department and Patients who were already admitted to the intensive care unit before surgery were excluded. Objective: The aim of this study is to identify the prevalence and associated factors of unplanned postoperative intensive care unit admissions. Results: From April 1 to October 31, 2019, a total of 110 patients were admitted to the surgical ICU after surgery; Of these, 87 patients (79.1%) were of the planned ICU admission group, and 23 patients (20.9%) were of the unplanned ICU admission group. The main reason for ICU admission were due to cardiovascular disturbance 6(26.1%) and for monitoring after resuscitations 6 (26.1%) followed by for respiratory events 4(17.4%). With adjusted multivariate analysis revealed that anesthesia given by anesthesiology residents (p=0.015, AOR=2.222, 95%confidence interval 1.472-20.556) and surgical time of more than four hours (p =0.024, AOR 2.145, 95% CI 0.177-25.992) were independent predictor factors. Conclusion: This study shows an association of longer surgical time and anesthesiology residents with unplanned ICU admission after surgery.