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56 Chapter 5 Results and discussion This chapter is set out in six parts. The first three parts on: • MHE effectiveness and pressure drop measurement, and MHE construction evaluation, cover heat exchanger performance. The next three parts on: • CO2 removal, water cycling, and CO2 MHE regeneration tests, cover CO2 removal process evaluation. Errors in experimental measurements for each case are discussed. The general treatment of errors is described in the first section. Data files from the various tests are not included, to save space. A mass spectrometer was used to monitor CO2 and water concentration in the inlet and outlet streams for the tests on CO2 removal and water cycling. Both CO2 and water are strongly adsorbed on surfaces in vacuum systems and the effect of this on the results obtained is discussed. 5.2 Heat transfer and pressure drop performance of the matrix heat exchanger 5.2.1 Effectiveness test results The experimental results of single heat exchanger effectiveness tests show that the measured effectiveness for the tested range of flow rates is 97% ±1.9%. Within the limits of minimum experimental uncertainty this is not measurably different from the predicted values. These results are shown in Figure 5.1 and Figure 5.2. Measured and predicted effectiveness are plotted for a range of flow rates of gaseous nitrogen. Dry gaseous nitrogen was used for these tests to ensure that no condensation, ie. no mass transfer, occurred in the MHE. Each experimental data point on the graph represents the mean of data recorded over 10 to 20 minutes of steady state operation. The two theoretical performance predictions are calculated from: (a) A running version of the program in Venkatarathnam's doctoral thesis[80]. This running version was obtained through correspondence with the author[101]. He stated that the program included in his thesis is a pared down version of a larger program and suggested changes to the source code. (b) The modified approximate analytical solution used in the sizing procedure. This sizing procedure has been described previously in chapter three.PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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