Chapters in Books (Mechanical and Mechatronic Engineering)

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    (ASTFE, 2022-08-08) Imtiaz, Nida; Wahid, Mazlan Abdul; Kamaruzaman, Natrah Binti; Ng, Kim Choon; Xu, Ben Bin; Shahzad, Muhammad Wakil
    The global Central Processing Units (CPUs) are expected to grow at a significant CAGR of 3.6% by 2028. The major factors driving the growth are increasing demand for high processing power CPUs in various applications such as personal computers, servers, and portable computers, among others; growing adoption of enterprise systems that require high-performance CPUs with faster processing speed; and rise in the number of CPU cores per chip over time. However, thermal management is a crucial issue to maintain their performance with increasing processing speed and number of CPU cores per chip. The conventional fans/blowers are unable to maintain required temperature and hence deteriorate CPU performance. We proposed an innovative miniature indirect evaporator cooler for thermal management and local cooling of electronic boards, CPU and Graphics Processing Unit (GPU). In proposed unit, the humidity of supply air is maintained by separating dry and wet channels via thin copper film that also provide good heat transfer properties. Thin water layer is maintained through wick surface in wet channel to extract heat from supply air flowing in dry channel. In order to achieve the objectives and evaluate the performance, miniature indirect evaporator cooler is designed and most of parts are fabricated using 3D printing facility. Extensive experiments are conducted at assorted temperature to map the performance for various electronic units applications. The result shows that the 200mm x 150mm cell with 5 dry and wet channels can achieve up to 40–45Watt cooling capacity. Based on 3D printed modular design, it has flexibility to improve capacity to match application requirements. The proposed miniature cooler can be employed for electronic thermal management and maintain low temperature to enhance their efficiency and improve processing speed.
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    Review of optimization techniques
    (John Wiley & Sons Ltd., 2010) Venter, G.
    A basic overview of optimization techniques is provided. The standard form of the general nonlinear, constrained optimization problem is presented, and various techniques for solving the resulting optimization problem are discussed. The techniques are classified as either local (typically gradient-based) or global (typically non-gradient based or evolutionary) algorithms. A great many optimization techniques exist and it is not possible to provide a complete review in the limited space available here. Instead, an effort is made to concentrate on techniques that are commonly used in engineering optimization applications. The review is kept general in nature, without considering special cases like linear programming, convex problems, multi-objective optimization, multi-disciplinary optimization, etc. The advantages and disadvantages of the different techniques are highlighted, and suggestions are made to aid the designer in selecting an appropriate technique for a specific problem at hand. Where possible, a short overview of a representative method is presented to aid the discussion of that particular class of algorithms.