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5.3 Heat transfer and pressure drop performance of two matrix heat exchangers coupled together 5.3.1 Effectiveness measurement The measured effectiveness of the two MHE's operating in series was 93% ±2.5% over the tested range of flow rates of dry gaseous nitrogen. This result is shown in Figure 5.8. Of the two matrix heat exchangers in series, the first was operating at temperatures between ambient and -60°C, and the second between -60°C and -160°C. The -60°C limit was at the cross-over valve and has been discussed previously in the chapter four. The minimum uncertainty in the effectiveness calculated from liquid nitrogen boil-off is ±4.4%, as calculated before. For the two MHE's taken together the uncertainty in the temperature based value becomes ±3.0%, giving a combined minimum uncertainty of ±2.5%. As can be seen from Figure 5.8 most of the measured results lie within this minimum uncertainty. Figure 5.8 flow rate (ljmin nominal) Combined effectiveness vs. nominal flow rate of nitrogen, for two matrix heat exchangers in series. 0.99 0.98 0.97 0.96 ~ ~ 0.95 'p o calculated from boil-off, ±4,4% + calculated from temperatures, ±3.0% (/J (/J (,) +~ ~u0.94 0.93 0.92 Bo + 8 <> o o + <> III a + $o oo +o o + <> combined result, ±2.5% regression line for combined result minimwn uncertainty, ±2.5% .----~-------------------------+----------------------------------- +~ 0.91 o. 0 0 + 0 <> .------------,--------------.---------------.-------------------------.---------------------------------------z,---------------------<>--------------------- +++ 0.9-t-----r---,.------,-----.----i----,------, 30 50 70 90 5.3.2 Effectiveness reduction due to heat leak The 4% reduction in effectiveness of the two MHE's in series over the single MHE was thought to occur for two main reasons: (a) The addition of the cross-over valve between the two MHE' s. The cross-over valve 65PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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