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Chapter 5 Performance evaluation: heat exchanger performance and CO2 removal process; and discussion of results Results of experimental testing on heat exchanger performance and the CO2 removal process are presented and discussed. Measurements of heat exchanger effectiveness are presented, and the associated minimum experimental uncertainty is calculated. The performance of the cross-over valves and associated actuator is discussed. Difficulties encountered in trace CO2 analysis using the mass spectrometer, and the steps taken to circumvent some o f these problems are described. Results o f tests conducted to investigate functioning of the reversing heat exchanger and C02-MHE regeneration are presented. 5.1 Introduction The main focus of this work was to establish whether CO2 removal from air may be effected by refrigeration purification, with only about 15% of the cooling required available. Implicit in this work is a new sizing equation and a new construction method for perforated plate matrix heat exchangers. The experimental work was conducted as four separate series of tests to determine: (a) Heat transfer and pressure drop performance of the matrix heat exchanger. To establish that the heat transfer effectiveness of the designed heat exchangers was greater than at least 85%, as required for the CO2 removal process. To compare the measured performance with performance predicted by the sizing procedure developed and other theoretical predictions. This performance was measured by conducting tests on a single heat exchanger. (b) Heat transfer and pressure drop performance of two MHE's coupled together. The CO2 removal process design requires two MHE's to be connected in series with a cross-over valve between them. It was not known what effect this configuration would have on the combined performance and this had to be determined experimentally. (c) The feasibility of CO2 removal from air to 10ppm by refrigeration purification. These tests were carried out using bottled dry air so that the CO2 removal alone could be measured. (d) CO2 removal from ambient humid air, and the performance of the reversing heat exchanger in water condensation and re-vaporisation (water cycling). These tests were carried out using wet air from a laboratory compressed air supply.PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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