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adsorbent breakthrough, is a function of uncertainty in gas velocity [m s-1], th [m] and L [m]. The uncertainty variation in adsorption time is not reported uniquely, because the uncertainty in adsorption time has different values for different tests, based on the feed velocity and length. For a ΔP of 10 kPa across a 4 m long channel, the absolute uncertainty in adsorption time is calculated as 13.8 s, while the measured adsorption time is 33.6 s (41% relative uncertainty). For the same length, a ΔP of 50 kPa results in an absolute uncertainty of 0.6 s for the measured adsorption time of 6.6 s (9% relative uncertainty). For the range of tests conducted in this study, the minimum, maximum and average uncertainties in adsorption times are 0.03 s, 13.8 s, and 1.37 s (relative uncertainties of 6.83%, 41% and 22.52%), respectively. These uncertainties are discussed in greater detail in subsequent sections, in conjunction with comparisons between the measurements and model predictions. 4.4 Model development Fluid flow, heat and mass transfer models are developed for the laboratory adsorption tests described above. Figure 4.5 shows a schematic of the model architecture used for development of the adsorption stage model in gPROMS ModelBuilderTM (Process Systems Enterprise, 1997-2015). 115PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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