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Article
Decision Making in Materials Selection: an Integrated Approach with AHP

Authors: Sattar A. Mutlag --- hamad M. hasan
Journal: Anbar Journal of Engineering Sciences مجلة الأنبار للعلوم الهندسية ISSN: 19979428 Year: 2019 Volume: 7 Issue: 4 Pages: 399-407
Publisher: University of Anbar جامعة الانبار

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Abstract

Materials selection is a multi-criteria decision-making (MCDM) problems because the large numberof factors affecting on decision making. The best choice of available material is critical to thecompetitiveness and success of the manufacturing organisation. The analytical hierarchy process(AHP) is an important tool to solve MCDM problems. The choosing process of suitable material(such as a refrigerant fluid) for the Air Condition System (ACS) is faced with challenges such aslack of a systematic approach in setting the optimal performance in terms of its impact on theenvironment and operation. Selecting process for the one refrigerant from a range suitable ofsuitable refrigerant is complex process. The study presents a comparative performance analysisof ACS for using four alternative refrigerants R290, R410, R404 and R22. Then, one of these suitablerefrigerant is selected. The comparison is based on three criteria system operation, environmentand maintenance.Novels ACS performance assessment model is proposed based on an analytical hierarchy process(AHP). The model is based on two main criteria of ACS, quantitative criteria, cooling capacity(CC), coefficient of performance (COP), etc.).And qualitative criteria (Ozone Depletion Potential (ODP), Global Warming Potential (GWP) andmaintenance cost (MC)). It is necessary to look for new technique help decision making to selectalternative refrigerants, to fulfill the goals of the international protocols (Montreal and Kyoto)and optimum operation, to satisfy the growing worldwide demand, in addition the increase outdoortemperature in some countries.This study provides a developed methodology for evaluating ACS performance. Moreover, it helpsto select a robust decision. The results obtained from AHP process that the best rank of the suitablerefrigerant was R404 (0.3763) followed by R22 (0.3657) and so on for the other. Therefore,the proposed methodology can help the decision maker to select the best alternative for bothcriteria (qualitative and quantitative) in complex selecting process.


Article
Material Selection for Competition–A Case Study for Air Coolers

Authors: Luma A. H. Al Kindi --- Amjad Husien Jasim --- Entsar Nife Farhan --- Batool Ibraheem Jameel
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2018 Volume: 26 Issue: 3 Pages: 274-306
Publisher: Babylon University جامعة بابل

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Abstract

Competition is one of the most important challenges that is facing the marketing of industrial products in today's markets. In this research study of the impact of material selection factor for air coolers of different materials is applied. Investigation on the air cooler windows which are part of the body of air coolers is conducted. Corrosion resistance, thermal conductivity, strength of material, weight, shape, cost and manufacturing process are the factors that are applied and calculated on three types of materials Aluminum, Galvanized steel and polypropylene. The physical properties of the three mentioned materials are used to calculate Merit Index .The corrosion average, according to Tafel Method depending the corrosion current and adopting contactors for the anodic and cathodic metals behaviors is performed. ANSYS is adopted using the three samples for the selected materials Aluminum, Galvanized steel and polypropylene to measure maximum stress and deflection are measured. Accordingly, the results are compared to choose the best alternative. It is observed that the polypropylene is the best choice depending three factors while the aluminum material is better depending two factors and the galvanized steel is regarded as the best in only one factor, the rest factors are identical when choosing an alternative material for manufacturing the air cooler windows.

تعتبر المنافسة من اهم التحديات التي تواجه تسويق المنتجات الصناعية في الوقت الحاضر. في هذا البحث تمت دراسة تأثير عامل اختيار المواد لمنتج صناعي (شباك مبردات الهواء) باعتماد معايير مقاومة التأكل، التوصيل الحراري، مقاومة المواد، الوزن، الشكل، الكلفة واسلوب التصنيع. تم التطبيق على شباك مبردة الهواء بموجب المواصفات الفنية المعتمدة في شركة الهلال واعتمدت الاختبارات ثلاث نماذج من كل من سبيكة الالمنيوم 3003 والحديد المغلون والبولي بروبلين باسماك واوضاع مختلفة. باعتماد المواصفات الهندسية لكل مادة تم حساب ال Merit Index وكذلك تم اجراء اختبارات مقاومة التآكل اضافة الى اعتماد برنامج ANSYSلحساب معدلات التشوه والاجهادات القصوى لكل عينة. تمت مقارنة النتائج للوصول الى الخيار الانسب من بين الخيارات التي اعتمدت وبينت النتائج ان سبيكة الالمنيوم 3003 هي الاختيار الامثل باعتماد معيارين في حين ان البولي بروبلين كان الخيار الانسب بمقارنة ثلاث معايير، اما الحديد المغلون فكان افضل الخيارات في معيار واحد فقط، المعايير الاخرى كانت متماثلة في اختيار المادة البديلة المعتمدة في تصنيع شباك مبردة الهواء.

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