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2.3 Schematic description of the process 15 evaporating the previously condensed water. Therefore at any time, one channel is condensing water and transferring heat to the other channel where water is being evaporated. The flow is switched (inlet and outlet swapped) at a period dependent on how much water can be condensed before that channel needs to be dried, and the minimum volume flow required in each period to nullify cross-over contamination. Flow switching is achieved through two, four-way cross-over valves controlled electronically. Raw air-"--1--.'--++--111- AFC feed air <10ppm CO2 Warm end 4-way crossover valves, electronically controlled, allow flow· reversal In reversing heat exchanger, While there is unidirectional flow in the CO2 SUblimation heat exchanger Bypass valves to control cold end temperature H2out to AFC ---I.:x:I--4-I H2vapour retum for refuelling Reversing heat exchanger for water condensation/evaporation Condensing and evaporating streams swapped by 90·counterclockwise rotation of crossover valves CO2 sublimation heat exchanger Not reversing H2vapour from LH2 tank Figure 2.3 Schematic representation of heat exchanger apparatus for CO2 removal. Off-line CO2 subliming heat exchanger not shown. In the CO2 sublimation region, between 200K and 112K, there are two direct counterflow heat exchangers operating with no flow switching. One is on-line while the other is being dried by simply allowing it to warm up. The volume of solid CO2 deposited is O.372mllkgair•PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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