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80 Chapter 5 Results and discussion 5.7 CO2 MHE regeneration tests The CO2 deposited in the heat exchanger may be expected to vaporise if the temperature at the cold end is allowed to rise. The saturation temperature for CO2 in air is 130K (-143°C). A test was conducted to determine whether regeneration could be effected by allowing this temperature rise. At the end of a CO2 removal and water cycling test, the cold end temperature was allowed to rise from its test value of -160°C. Figure 5.20 shows the measured pressure drop and cold end temperature with time. It can be seen that as the temperature rises from -160°C to -142°C the pressure drop across the heat exchangers returns from 30kPa to the original ~1OkPa. The fluctuation of the pressure differential readings seen in Figure 5.20 occurs for two reasons. Firstly, as the pressure differential decreases the flow rate of air through the heat exchanger apparatus increases. To compensate, the flow rate is decreased manually, and this causes a step decrease in the measured pressure differential. Secondly, the pressure of the air supply itself fluctuates. Results summary Single heat exchanger effectiveness 97%±1.9% Pressure drop per channel 1kPa Double heat exchanger effectiveness 93%±2.5% Total pressure drop including cross over valves 10kPa CO2 removal to 20ppm for 131: hours, 50ppm for 2-231: hours Pressure differential increase linked to outlet CO2 concentration Currently available cross over valve operating temperature limited to -40°C Water cycling in reversing heat exchanger established, but water carryover to CO2 subliming MHE occurs due to cross over valve temperature limit. Regeneration o f CO2 subliming heat exchanger achieved by warming it by 18°CPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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