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Chapter 4 An apparatus to test CO2 removal from air by refrigeration purification Heat exchanger effectiveness, CO2 removal by refrigeration purification, including water condensation and re-vaporisation in a reversing heat exchanger, are to be investigated experimentally. The development of a fully instrumented apparatus to test matrix heat exchangers in these applications is described. In order to establish the efficacy of the heat exchangers and their application to the proposed process of CO2 removal by refrigeration purification, an apparatus was required to be designed and built to measure: (a) (b) (c) (d) Heat transfer and pressure drop performance of the matrix heat exchanger. Heat transfer and pressure drop performance of two MHE's coupled together with the cross-over valves that are required for the CO2 removal process configuration. CO2 concentration to lOppm in air, to determine CO2 removal by refrigeration purification. H20 concentration in ambient humid air to lOppm, to determine the performance of the reversing heat exchanger in water cycling. monitor the CO2 removal process as a whole, including reversing heat exchanger To performance, the CO2 and H20 concentrations must be able to be measured continuously. The apparatus developed for this project is essentially in two parts: one consisting of the matrix heat exchangers and associated equipment; and the other, consisting of a mass spectrometer and its associated equipment. The two parts are completely independent of each other. When the matrix heat exchanger apparatus is tested for the CO2 removal process as a whole, the mass spectrometer is used for monitoring continuously, CO2 and H20 concentrations in the process air stream. 4.1 Apparatus for heat exchanger testing 4.1.1 Method for testing matrix heat exchanger effectiveness Heat exchanger effectiveness, at steady state, may be calculated directly from inlet and outlet temperatures. At high effectiveness however, errors in temperature readings become amplified in terms of Ntu or heat transfer coefficient[80-p136]. In addition, in this application it was uncertain what, if any, variation there might be of thePDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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