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E. HEAT TRANSFER COEFFICIENTS IN THE TEST ENVIRONMENT This section describes the estimation of heat losses during the transient adsorption process. During the experiments, as the fused silica temperature varies, the insulation surface temperature also changes in accordance with the rate of heat loss between the fused silica and the ambient. In the present work, in view of the low temperature differences between the test section and the ambient and the expected correspondingly low heat losses, a representative temperature difference of 1°C between the insulation surface temperature and is assumed for the heat loss estimation based on the resulting natural convection and radiative heat transfer coefficients. Rates of heat loss for the temperature extremes observed in the present work are analyzed here to support this assumption. For the batch adsorption tests on PLOT columns and adsorbent-coated microchannels, the fused silica temperature is observed to vary between 22°C to 32°C. (A fused silica temperature of 22°C implies that heat of adsorption at the concerned location is insignificant or no adsorbent is present at that location). Table E.1 shows the estimated relevant parameters for representative values of fused silica temperature of 23°C, 27°C and 32°C. Table E.1. Variation of heat loss parameters for fused silica temperature extremes observed in the experiments Case 1 2 3 TFS Tamb [C] [C] 23 22 27 22 32 22 Tins [C] 22.23 23.00 23.77 Qgen [W m-1] 4.25 24.62 52.28 hfree [W m-2 K-1] 2.088 2.835 3.217 hr [W m-2 K-1] 0.584 0.588 0.593 RFS↔∞ [K-m W-1] 0.447 0.349 0.313 Qloss,act [W m-1] 2.23 14.32 31.68 Qloss,calc [W m-1] 2.86 14.32 28.64 For the smallest value of fused silica temperature of 23°C, the insulation surface temperature, hfree, and hr are calculated as 22.23°C, 2.088 W m-2 K-1 and 0.5836 W m-2 K- 210PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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