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36 Components design block. In order to reduce the weight, a lighter material should be considered in this design. Titanium is an attractive option since it is a suitable material for the PCHE manufactur- ing process, it is corrosion resistant, and presents comparable mechanical characteristics to stainless steel [41]. The PCHE of the work of Song is the reference used in the next sections for the dimensioning of the regenerators. For the sake of simplicity, it is considered that the channel wave angle, number of channels and travel length are the same for both hot and the cold sides. Therefore, these parameters are obtained averaging the values given in Table 3-1. The geometry of the heat exchanger used in the present study is described in Table 3-2. Table 3-2: PCHE parameters fixed for this work Parameters Hydraulic diameter Channel diameter Plenum chamber length Wave angle (θ) Sidewall thickness Top and bottom wall thickness Material Value mm 0.92 mm 1.51 mm 48.00 ◦ 26.84 mm 44.6 mm 32.5 Titanium alloy grade 5 The sidewall and the top and bottom wall thickness are not presented in the work of Song. These values are taken from a similar analysis made by Meter [56]. The horizontal pitch and the plate thickness are of fundamental importance since they influence the final weight of the component. They are going to be reduced to their minimum value in order to decrease the heat exchanger dimensions as a function of the allowable stresses in the channels. Wall and plate thickness, simplified stress analysis As mentioned earlier, in order to decrease the PCHE volume and weight, it is necessary to evaluate the horizontal wall thickness (t in Figure 3-3) and the plate thickness (δ in Figure 3-3) to decrease them as much as possible. The method recommended by Hesslegraves [52] to calculate the horizontal pitch is used. The stress in the walls between horizontal channels, σ, is given by 1 σ=∆P Nt−1 , (3-1) where ∆P is the pressure difference between hot and cold sides and N is the number of walls between channels per meter. The number of walls per meter can be calculated using the horizontal pitch, N= 1 . (3-2) t+DCH Combining the last two expressions it is possible to obtain the minimum wall thickness, t=D ∆P. (3-3) CH σ According to the last expression, t increases with higher pressure differences, and decreases with larger allowable stress. The stress is considered to be the yield stress of the material, J.S. Bahamonde Noriega Master of Science ThesisPDF Image | Design method for s-CO2 gas turbine power plants
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