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5.2 Single heat exchanger performance 61 sets of results. This has been calculated for each test from the mean of the LN2 boil-off and the mean of temperature based effectiveness, and is plotted in Figure 5.1 and Figure 5.2. The combined error is (5.6) From Table 5.1 the errors for the effectiveness as calculated from LN2 boil-off and temperatures, ±4.4% and ±2.1% respectively, give a combined error of ±1.9%. 5.2.4 Discussion of experimental effectiveness results The experimental results show that heat transfer effectiveness for the flow range tested is 97% ±l.9%. Given the minimum uncertainty is ±1.9%, the experimental and theoretical results are not significantly different. Figure 5.2 shows the ±1.9% minimum uncertainty on the graph along with the combined experimental result and the theoretical predictions. Figure 5.4 time (min) Fluid temperatures at various positions at the cold end during steady state test. ,-.., U 0 '--' (!) ~ -120 as S' -130 E '"0 'S -140 l:i=l -150 -160 + LN2-HX inlet o By-pass outlet x By-pass inlet Cold end inlet avg. <> LN2-HX outlet -70 -80 -90 -100 M -110 /::; ~ -170 o 2 4 6 8 10 12 From Figure 5.1 it can be seen that in every case the effectiveness calculated from the boil-off of liquid nitrogen is lower than that calculated from the hot and cold end temperatures. This discrepancy was thought to be due to heat leak by conduction at the cold end through the by-pass and liquid nitrogen heat exchanger pipe-work and valves. Figure 5.5 shows the location of the thermocouples and the gas flow paths. It canPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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