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78 Chapter 5 Results and discussion 50ppm can be maintained for up to at least 2 hours before regeneration is required. (b) The pressure differential between inlet and outlet is linked to the CO2 concentration in the outlet stream. It may be used as the indicator for regeneration times. Initial total pressure drop was measured at 10kPa. Pressure drop for each channel in the heat exchanger core has been previously measured at 1kPa. This indicates that ~6kPa pressure drop occurs in the cross-over valves. 5.6 W ater cycling tests using compressor supplied air Water cycling tests were done using air from a laboratory compressed air supply. Water concentration in the inlet and outlet streams was measured in the same way as the CO2 concentration. A test sample is shown in Figure 5.19. It can be seen that the inlet and outlet H20 readings were very similar. The difference between them was at most the 10% limit of resolution of the mass spectrometer. Once again the concentrations were averaged over time to see if a result was obtainable. These results are shown in Table 5.6. 420 400 380 §' 360 b i< ~ i 1:1. ca .~ 120 P< 100 80 60 <><><><> <><> <> 7400 7600 7800 8000 8200 time (s) <><><> <> <><><> <><><><> <> <> <><> <> <><><><><> <><><><> <><><><> <><> <> <><> <> <> <> <><> <><><><><><><><> <> <><><><><><><>< Hp inlet and outlet, and Ar peak heights for a reversing heat exchanger test. The cross-over valve located between the reversing heat exchanger and the CO2 D subliming heat exchanger had previously restricted testing to -60 C. Below this temperature the valve would begin to leak even when it was not operated. This has been discussed previously in chapter four. It was found that when this valve was operated, it Figure 5.19 .~ Hpinlet o H2 utlet <> ArPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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