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46 Components design equations, the pressure drop calculation present large deviations in all the cases. Nevertheless, the correlations of Hesselgraves are chosen since they predict the best heat transfer coefficient and travel length. Further analysis should consider the improvement of the pressure drop prediction. The temperature profile of the PCHE according to the chosen correlations is presented in Figure 3-7. 200 180 160 140 120 100 80 0 0.5 1 1.5 L [m] Hot stream Cold stream Temperature ◦C Pressure bar Travel length m Heat transfer area m2 Hot side In 181.00 (181.00) 75.47 (75.00) 1.61 (1.230) 6.94 (5.60) Out 85.00 (85.00) 74.76 (74.76) Cold Side In Out 84.00 176.86 (84.00) (176.90) 202.00 201.86 (202.00) (201.30) 1.61 (1.378) 6.94 (5.60) Figure 3-7: PCHE temperature profile (according to the Hesselgraves correlations) as a function of the travel length. Values in parenthesis are those given by Heatric and reported by Song [4]. As already mentioned in Section 3-1-4, it is assumed that the acceleration losses are neg- ligible. It is necessary to check the validity of this assumption and, in order to do so, the percentage values of the these losses compared with the friction losses are calculated and pre- sented in Figure 3-8. The difference in magnitude indicates that the effect of the acceleration losses can be neglected and therefore the assumption is valid. −3 x 10 4 3.5 3 2.5 2 1.5 1 0.5 0 0 0.5 1 1.5 L [m] Hot stream Cold stream Figure 3-8: Percentage acceleration losses with with respect to friction losses as a function of the travel length. J.S. Bahamonde Noriega Master of Science Thesis ∆PAC [%] T [◦C]PDF Image | Design method for s-CO2 gas turbine power plants
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