Analysis of equilibrium and kinetic parameters of water adsorption heating systems for different porous metal/metalloid oxide adsorbents

authors	Pinheiro, JM; Salustio, S; Rocha, J; Valente, AA; Silva, CM
nationality	International
journal	APPLIED THERMAL ENGINEERING
author keywords	Water adsorption heating systems; Porous metal/metalloid oxides; Equilibrium; Kinetics; Modelling; Simulation
keywords	THERMAL-ENERGY STORAGE; MASS-TRANSFER; WORKING-CONDITIONS; PACKED-BEDS; SILICA-GEL; ZEOLITE; PUMP; CONDUCTIVITY; ISOTHERMS; DIFFUSION
abstract	The performances of well-known porous metal/metalloid oxide adsorbents (zeolite 13X, zeolite 4A and silica gel) and less explored Engelhard titanosilicate ETS-10 for water adsorption heating systems (AHSs) were compared with the aid of computational modelling and simulations. The developed model contemplated adsorption equilibrium, one-dimensional heat and mass transfer in the bed, external heat transfer limitations, and intraparticle mass transport. The pair zeolite 13X/water seemed most promising for the AHS partly due to a higher amount of heat generated per cycle, and favourable water-adsorption isotherm features. Based on sensitivity studies, for zeolite particle diameters in the range 0.2-0.6 mm, the coefficient of performance was 1.48 and the specific heating power was in the range 1141-1254 W Kg(s)(-1) Aiming at inferior computational and numerical efforts, the impact of considering some simplified postulations (e.g. constant thermal conductivity of the adsorbent; constant isosteric heat of adsorption; constant linear driving force coefficient), while ensuring comparable predictions of the performances of the AHSs, was successfully investigated. (C) 2016 Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	1359-4311
year published	2016
volume	100
beginning page	215
ending page	226
digital object identifier (doi)	10.1016/j.applthermaleng.2016.01.142
web of science category	Thermodynamics; Energy & Fuels; Engineering, Mechanical; Mechanics
subject category	Thermodynamics; Energy & Fuels; Engineering; Mechanics
unique article identifier	WOS:000377231400021