Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure

Design enhancement of an adiabatic LiBr-H2O absorber through a droplet flow optimization

“…The modification of the plate surface with the addition of fins was studied by Mortazavi et al [62]. Thanks to a more uniform distribution of the film on the plate surface the average film thickness could be reduced, and consequently, the measured absorption rate was double the one of a plain plate.…”

“…The heat and mass transfer model described in Chapters 4 and 5 has been applied iteratively for each row of pins considered. The initial values for the solution temperature and concentration have been set equal to the ones used by Mortazavi et al [62] and are reported in Table 6-1. In their study the authors reported the resulting absorption rate from several works available in the literature, and it is thus a good benchmark for comparison.…”

“…If the absorption rate for the 5 row case is compared with the other literature results collected in [62], the absorption rate obtained for the 1.2 kPa operating pressure (point X1 in Fig. 6.5) falls in between the performance region of Sun et al [107] and Islam [52], who investigated traditional tubular absorbers and the region of the plate absorbers studies by [62] and by Karami and Farhanieh [61] and the works concerning the membrane absorber of Isfahani and Moghaddam [108] and Ali [109], presented in Fig. 6.5.…”

“…6.5. 6 [62] and modified with the current absorption rate value with (X2) and without additional mixing (X1)…”

“…For the proposed design, the linear mass flow rate is calculated to be 0.15 kg/min m. If compared with the range used in the works reported in [62], it can be observed that no data is collected in the lower range of linear mass flow rate by any of the studies. Indeed, falling film absorbers require a higher flow rate per unit of length as the heat convection around the tubes is of great importance for a good operation.…”