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82 Chapter 6 Conclusions and recommendations feasible that such a process could be used in vehicular application. For this project, matrix heat exchanger geometry was optimised giving equal weighting to heat exchanger volume, the number of plates and core pressure drop. The total pressure drop through the matrix heat exchanger cores was measured at 4kPa. This is twice that for Elenco nv.'s soda lime scrubber accompanying the BCB-l 1.2kW AFC module, on which basis the heat exchanger apparatus for this project was sized. A lower pressure drop could be achieved by optimising the heat exchanger geometry with a higher weighting for the core pressure drop. The heat exchanger in which the CO2 sublimation occurs, and the reversing heat exchanger, are both perforated plate matrix heat exchangers. For this work, in order to be able to build the required matrix heat exchangers, a new method for their construction was developed. This method o f manufacturing copper perforated plate and fibre laminate spacer matrix heat exchangers, was highly successful. Thermal and hydraulic performance evaluation experiments were conducted on the matrix heat exchangers built for this project. Single heat exchanger effectiveness was measured at 97%±1.9%. The experjmental results for heat transfer performance were compared with those predicted by the new sizing equation developed and the numerical solution for heat transfer performance of matrix heat exchangers, developed by Venkatarathnam (Ph.D thesis, lIT Kharagpur, India). The predicted and experimental results lie within the limits of minimum experimental uncertainty. 6.2 Further work 6.2.1 Suggested modifications to equipment for further testing Experimental results which may be improved and some possible ways of achieving this are suggested in the following sections. 6.2.1.1 Single heat exchanger effectiveness tests The minimum experimental uncertainty in these tests was ±1.9%. In order to reduce this, two factors must be addressed. The first is thermocouple calibration at cryogenic temperature. The second is the discrepancy between heat exchanger effectiveness calculated from temperatures and that calculated from LN2 boil-off. This discrepancy, discussed in section 5.2.4 and section 5.3.2, is due to heat leak through the by-pass and LN2-HX valves. The two valves are positioned so that they can be operated from outside the vacuum vessel. Hence a large temperature gradient exists along the actuation mechanism used, causing an unavoidable heat leak. The two valves and the by- pass pipe-work may be eliminated iftemperature control at the cold end can be achievedPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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