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5.2 Single heat exchanger performance 59 5.2.3 Experimental errors Experimental errors have been treated in accordance with Barford[103]. The approach has been to calculate the minimum uncertainty attainable for the measured results. 5.2.3.1 Random error In a typical test 152 data sets were recorded over ~18 minutes of steady state operation. The random error has been calculated for a 99.7% confidence level using s = 3cr n n112 where S is the standard error for n samples, and cr is the standard deviation. 3.4 !3 ~ 2.6 r.:= o ,oN 2.2 Z ~ 1.8 ~ 1.4 'S ~\ ~ 0.6 ----- 0.2 o 2 4 6 8 10 time (min) (5.4) Figure 5.3 Flow rate of nitrogen boil-off from LN2 bath with no flow through liquid nitrogen heat exchanger. "--- 5.2.3.2 Systematic error The only un-rectifiable systematic error was found in the thermocouple calibration. Due to the lack ofa cryogenic temperature calibration facility (ie. controlled temperature conditions and any other method of cryogenic temperature measurement) only four reference temperatures were used. Cold junction compensation temperature was adjusted to ambient, while an ice bath, solid CO2, and liquid nitrogen were used as the other three reference states. At liquid nitrogen temperature the thermocouple showed an error of 2%.PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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