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thermocouple readings are lower than the maximum value, indicating that the thermocouples in the case of samples 1 and 2 make contact with the low adsorbent loading region, due to which the predicted adsorption times for samples 1 and 2 are in good agreement with those observed. If the adsorbent packing properties in the models match exactly with those in the experiments at any axial location, the predicted ΔT would match the observed ΔTMax exactly. However, if there is a non-uniform adsorbent loading in the microchannel, then the observed temperature rise readings would be different for different axial locations, as seen in Figure 4.13. This local variation in the observed ΔTs in the experiments would result in a greater deviation of the predicted ΔT by the models from the average experimental ΔT. Samples 1 and 2 show this type of behavior, in which the observed ΔTMax values in the experiments match closely with the predicted ΔT by the models. However, because of variations in observed local readings, the agreement between predicted ΔT and observed ΔT is not as good as that between predicted ΔT and observed ΔTMax. The AAD for predicted ΔT for these two samples is 31%. For samples 3 to 6, predicted ΔTs have slightly better agreement with the corresponding experimental results for average ΔT (AAD of 24%), as compared to samples 1 and 2. This behavior indicates that packing is somewhat more uniform in these samples, as compared with samples 1 and 2. The AAD for average experimental ΔTMax for samples 3 to 6, is however 31%. For all six samples, the AADs for ΔT and ΔTMax are 25% and 20%. These AAD values indicate that the error bands for ΔT decrease by a factor of ≈ 2, as compared with the results for the PLOT columns. 152PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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