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VI run. Correspondence with Venkatarathnam was undertaken to try to correct the program in his thesis or obtain a running version. Furthermore, the program did not lend itself to easy optimisation of matrix heat exchanger geometry, or a better understanding of the effect of matrix heat exchanger geometric and flow variables. Using Venkatarathnam's approximate analytical solution, a sizing equation was derived, which allowed a desired effectiveness to be specified and the required gross geometry to be calculated, to obtain that effectiveness. This allowed simple optimisation of the matrix heat exchanger geometry. Corrections made to Venkatarathnam's matrix heat exchanger performance prediction program and a running version only became available in time to compare the experimental results obtained in this work with those predicted using his program. Venkatarathnam's analysis for matrix heat exchangers was developed specifically for thermal performance analysis for effectiveness >~90%. For whatever reason, he had been unable to construct matrix heat exchangers of a high enough effectiveness to do any experimental correlation. As part of this project a new method for construction of perforated plate matrix heat exchangers was developed. This allowed some experimental correlation for his analysis. The sizing procedure derivation, construction method and the optimisation of matrix heat exchanger geometry in conjunction with manufacturing limits is discussed in chapter three. Alongside the conceptual development of this process and designing heat exchangers to perform the required duty, an apparatus was developed for evaluating the CO2 removal process and the heat exchanger performance. This was based on an apparatus used by Gifford et al. (Adv Cryo Eng, vol.14, 1969) for measuring cryogenic regenerator performance. For gas analysis a mass spectrometer, and associated vacuum, baking and batch sampling system was set up. This was done in collaboration with Julian Robinson (ME thesis, University of Canterbury, 1995), who was investigating NOx formation in heterogeneous hydrogen air mixtures. For this project a variable throughput continuous sampling system was developed for use with the mass spectrometer. The design, development and instrumentation of the apparatus is covered in chapter four. The experimental work was done in four main parts to establish: single heat exchanger effectiveness; system effectiveness; CO2 removal from dry air; and reversing heat exchanger operation using moist air. The results of this testing are reported and discussed in chapter five. The conclusions reached as result of the investigations undertaken are presented in chapter six. Programs written for matrix heat exchanger sizing and optimisation, and process monitoring and control (data acquisition) are listed in the appendices. Analysis of self- pressurisation in liquid hydrogen tanks is covered briefly in an appendix. This project touches on the areas of hydrogen and fuel cell use, CO2 removal for alkaline fuel cells, high effectiveness heat exchangers, mass transfer in heat exchangers, and mass spectrometric trace analysis. For the sake of readability the vast backgroundPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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