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Design and Optimization of Thermal Systems by Kai Yang, Basem EI-Haik

By Kai Yang, Basem EI-Haik

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It is used to study the behavior of a given system, choose the appropriate variables for the desired effects, and evaluate various designs, leading to satisfactory and optimized systems. 2 SYNTHESIS FOR DESIGN Synthesis is another key element in the design process, since several components and their corresponding analyses are brought together to yield the characteristics of the overall system. Results from different areas have to be linked and synthesized in order to include all of the important concerns that arise in a practical system (Suh, 1990; Ertas and Jones, 1996; Dieter, 2000).

Thus, nonlinear equations are frequently obtained, making the solution difficult. Iterative methods are often needed to obtain the solution. Nonlinearity also makes it difficult to scale up the results from a laboratory model to the full-size system. Many of these considerations are discussed in detail in Chapter 3. The various other complexities mentioned earlier also complicate the analysis and design of thermal systems. Complex geometry and boundary conditions arise in most practical systems, making it necessary to use simplifications and versatile numerical techniques such as finite element and boundary element methods.

The discussion in this book is directed at the overall system and not at the individual subsystems, which may be the main focus of attention under different circumstances. For example, if an automobile is taken as the system, subdivisions concerned with cooling, transmission, fuel, ignition, and other such functions may be considered as subsystems. Then these subsystems may be treated as separate entities and finally brought together to represent the full system. In a power plant, the boilers, condensers, and cooling towers may be considered as subsystems.

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