Comparison of Design Methods

Figure 34-2 Simple experimental design for Youden/Steiner comparison of two Methods (data shown in Table 34-2).

This efficient statistical test requires the minimum data collection and analysis for the comparison of two methods. The experimental design for data collection has been shown graphically in Chapter 35 (Figure 35-2), with the numerical data for this test given in Table 38-1. Two methods are used to analyze two different samples, with approximately five replicate measurements per sample as shown graphically in the previously mentioned figure. 

P.M.J. Coenegracht, A.K. Smilde, H.J. Metting and D.A. Doombos, Comparison of optimization methods in reversed-phase HPLC using mixture designs and MCDM, Journal of Chromatography, 485 (1989) 195. 

Marshall, C. L., Rajniak, P. Matsoukas, T. 2011 Numerical simulations of two-component granulation comparison of three methods. Chemical Engineering Research and Design 89, 545-552. 

Szitkai et al. (2(X)2a) presented an extensive comparison of the methods mentioned above and showed that so far the best method for MENS is the MINLP model of Papalexandri et al. (1994). Using her model, most of the advanced pinch based designs of Hallale and Fraser can be reproduced or improved. Papalexandri s model is also superior to the insight based NLP method of Comeaux (2000). Still, as it was shown, Papalexandri s MINLP method sometimes delivers worse solutions than the advanced pinch design method of Hallale and Fraser. The most probable reason is that... 

The fifth and final chapter, on Parallel Force Field Evaluation, takes account of the fact that the bulk of CPU time spent in MD simulations is required for evaluation of the force field. In the first paper, BOARD and his coworkers present a comparison of the performance of various parallel implementations of Ewald and multipole summations together with recommendations for their application. The second paper, by Phillips et AL., addresses the special problems associated with the design of parallel MD programs. Conflicting issues that shape the design of such codes are identified and the use of features such as multiple threads and message-driven execution is described. The final paper, by Okunbor Murty, compares three force decomposition techniques (the checkerboard partitioning method. 

Comparisons by von Stockar and Wilke [Ind. Eng. Chem. Fundam., 16, 89 (1977)] between the rigorous and the classical adiabatic design methods for packed towers indicate that the simple adiabatic method underestimates the packing depths by as much as a factor of 1.25 to 1.5. Thus, when using the (dassical adiabatic method, one should consider the possible need to apply a design safety factor. 

From the standpoint of collector design and performance, the most important size-related property of a dust particfe is its dynamic behavior. Particles larger than 100 [Lm are readily collectible by simple inertial or gravitational methods. For particles under 100 Im, the range of principal difficulty in dust collection, the resistance to motion in a gas is viscous (see Sec. 6, Thud and Particle Mechanics ), and for such particles, the most useful size specification is commonly the Stokes settling diameter, which is the diameter of the spherical particle of the same density that has the same terminal velocity in viscous flow as the particle in question. It is yet more convenient in many circumstances to use the aerodynamic diameter, which is the diameter of the particle of unit density (1 g/cm ) that has the same terminal settling velocity. Use of the aerodynamic diameter permits direct comparisons of the dynamic behavior of particles that are actually of different sizes, shapes, and densities [Raabe, J. Air Pollut. Control As.soc., 26, 856 (1976)]. 

Huiidal, M. S. 1997 Product Costing a comparison of conventional and activity based costing methods. Journal of Engineering Design, 8(1), 91-103. 

---