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60 Chapter 5 Results and discussion First order uncertainty, or random error, and systematic error have been combined using the least error (least squares) principle, to give the Nth order uncertainty. These results are shown in Table 5.1. The two main results from the error analysis are that the effectiveness calculated from temperatures is at best ±2.1%, and that the effectiveness calculated from the boil-off rate is at best ±4.4%. Table 5.1 Random and systematic errors associated with various experimental measurements and results Random Including error systematic (%) error (%) Inlet temperature Outlet temperature Bypass temperature Cold end inlet temperature Effectiveness, temperature based, calculated Effectiveness, temperature based, measured 0.47 Boil-off rate 2.29 2.9 3.2 3.8 4.4 In this apparatus it has not been possible to estimate the error in temperature measurement caused by the balance of conduction, convection and radiation at each thermocouple junction, at the cold end of the matrix heat exchanger. This is because temperatures of the pipe-work and the various bodies inside the vacuum vessel are not known independent of the thermocouple measurements. Temperatures at the cold end and their influence on the measured results are discussed in section 5.2.4. 5.2.3.3 Combined result calculation In accordance with Barford[l 03] the combined result from the temperature based and boil-offbased effectiveness is calculated as (5.5) where X is the mean value, and nand m represent the number of samples for the two Reading Mass flow rate in heat exchanger Effectiveness, LN2 based, calculated Effectiveness, LN2 based, measured 0.21 0.73 1.2 0.33 1.0 0.11 1.0 0.10 1.0 0.81 2.1PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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