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64 Chapter 5 Results and discussion time at which the flow through the LN2-HX is turned almost off. Since the cold end temperature is controlled manually, rather than continually re-setting the cold end valves, a temperature drift of up to about 3°C was tolerated during steady state tests. Figure 5.4 shows typical temperatures during an effectiveness test. 5.2.6 Pressure drop measurement Figure 5.7 shows the pressure drop across one side of the MHE as measured and predicted. One predicted result is from the empirical equation of Shevyakova and Orlov[86]. The other was calculated using graphs from Kays and London[71] for entry and exit pressure loss coefficients for multiple-circular-tube heat exchanger core[71 :Fig.5-2,p111] and mean friction factor for the hydrodynamic entry length of a circular tube[71:Fig.6-23,p138]. Venkatarathnam[80] has used the same graphs from Kays and London, for pressure drop prediction, but contrary to the suggestion of Kays and London[71-p110] for interrupted fin surfaces, he has not used Kc and Ke values for Re=oo. Further, he has used the apparent friction factor from Figure 6-23 [71-p138] which already includes the entry and exit loss, rather than the mean friction factor. As may be seen from Figure 5.7 the result predicted using the Kc and Ke values for Re=oo, and the mean friction factor are in excellent agreement with the experimental result. Figure 5.7 40 60 SO 100 flow ratePDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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