“Water - Silica Siogel” working pair for adsorption chillers: Adsorption equilibrium and dynamics

Advanced Measurement and Simulation Procedure for the Identification of Heat and Mass Transfer Parameters in Dynamic Adsorption Experiments

“…The area S is the area on the carrier plate that is covered with the Siogel grains. Figure 1 S cm 2 17.8 ± 21 Pore average diameter [22] d pore nm 2 Internal surface area [22] s int m 2 /g 800…”

“…Thickness of the metal sheet (distance a-b in Figure 1) d mt mm 2 ± 0.1 Thickness of the fibrous plate (distance b-c in Figure 1 The data for a loose grains configuration of Siogel as studied by Sapienza et al [22] (a silica gel from Oker-Chemie (Goslar, Germany), called '3_Sio' in the paper) can be found in Table 2. The grains are placed on the carrier plate directly in a monolayer configuration.…”

“…The equilibrium loading X eqi is calculated from vapor pressure p vap and adsorbent temperature T sorb . For the equilibrium description X eqi (p, T) of Siogel, we use the Dubinin-Astakhov equation published by Sapienza et al [22].…”

“…Figure 3 shows a schematic drawing of the recently-modified kinetic setup at Fraunhofer ISE in which both large pressure jump measurements (LPJ) as described by Schnabel et al [8] and Füldner et al [19], as well as large temperature jump measurements (LTJ) as described by Aristov et al [15] can be performed. A brief description of the current setup was given earlier [22].…”

“…It can be stated that in all measurements, the difference between the calculated equilibrium loading difference and the actually measured loading difference is within an acceptable range of a 12% maximum deviation. For a short comparison of the sorption dynamics, the time constant of the exponential fit of the uptake curve τ, the times at 80% loading and at 90% loading are given according to Sapienza et al [22] in Table 6. The dynamics of the inert-LTJ experiments are described with the time constant of an exponential fit of the surface temperature signal.…”