Thermal design of a tray-type distillation column of an ammonia/water absorption refrigeration cycle

Analysis of internal heat recovery capability in air-cooled indirect fired GAX-based absorption chiller in part-load operation

“…The figure shows that the purification process of the vapour flow obtained in the re-boiler reached a plateau on the seventh plate, as reported by Ref. [ 46 ]. The plateau on a lower plate is reached when T cf,hot is 160 °C, which is aligned with the lower extension of the purification process in the column of distillation when T cf hot reduces.…”

Waste to Energy Onboard Cruise Ships: A New Paradigm for Sustainable Cruising

“…The concentrated vapor in state 8 leaves the GEN towards the distillation column (DC), where it is further concentrated. The distillation column must reduce the water content in the vapors produced by the generator to avoid that liquid water accumulates in the evaporator, causing a sensible reduction of the COP [39,40]. Furthermore, the vaporization temperature increases at higher concentrations of water in the vapor mixture (temperature glide): this, in turn, implies that a lower evaporation pressure must be attained to realize the required cooling effect [40].…”

“…The distillation column must reduce the water content in the vapors produced by the generator to avoid that liquid water accumulates in the evaporator, causing a sensible reduction of the COP [39,40]. Furthermore, the vaporization temperature increases at higher concentrations of water in the vapor mixture (temperature glide): this, in turn, implies that a lower evaporation pressure must be attained to realize the required cooling effect [40]. It is assumed that the refrigerant vapor leaves the DC with an ammonia concentration of 100%: this limiting condition is not significantly far from concentrations obtained with conventional distillation towers (see, e.g., Clerx and Trezek [41]).…”

“…White and O'Neill [42] suggest that an ammonia concentration not lower than 99.9% wt is required for a proper ARC operation. The distillation tower and the generator can be integrated in a single component, as is the case for sieve-tray DC's [40], where a reservoir of liquid solution at the base of the column acts as generator. The refrigerant vapor leaves the DC in state 9, flowing towards the condenser (CND), where it is condensed to saturation Appendix A.…”

Diseño de una columna empacada y una torre de bandejas perforadas para la absorción de etanol. 2. Diseño de la torre de bandejas perforadas

“…Las torres de bandejas han sido objeto de estudio tanto en cuestiones relacionadas con su diseño (Anand & Erickson, 1999;Pilling, 2006;Zavaleta-Aguilar & Simões-Moreira, 2012), eficiencia (Cheng & Chuang, 1993;Lamprecht, 2017;Zahedi et al, 2010), evaluación del rendimiento (Olivier & Eldridge, 2002;Outili et al, 2013) y cálculo del número de bandejas (Azizi et al, 2015), así como en lo relacionado con sus aplicaciones y aspectos generales (Benitez, 2009;Kister, 1992;Lockett, 1986;Rose, 1985).…”