Analysis of heat and mass transfer in porous sorbents used in rotary regenerators

A mathematical model for predicting the performance of a compound desiccant wheel (A model of compound desiccant wheel)

“…They are termed as ''gas side resistance models". With the increasing knowledge of the diffusion mechanism inside the desiccant material, ''gas and solid side resistance models" which take both gas side and solid side resistance into account are developed by many researchers [9][10][11][12][13]. It can be learned that compared with gas side resistance models, gas and solid side resistance models are more related to the actual process in the desiccant wheel.…”

Performance Assessment of a Solid Desiccant Based on Dehumidifier System Coupled with Air Conditioning System in a Tropical Climate

“…The numerical analysis is based on the following assumptions: (1) The air flow is one-dimensional. Based on the above assumptions, the energy and mass conservation equations can be obtained as follows [22,23] Mass conservation for the process air…”

On the validity of lumped capacitance approaches for the numerical prediction of heat and mass transfer in desiccant airflow systems

“…When advanced numerical methods are used, solving the complete set of differential transport equations, a number of critical issues still remains, such as the lack of suitable functions to describe the variation of the porous medium properties [8,42,52,53] and the complexity of numerically solving the intrinsically coupled phenomena within the porous desiccant solid and the great time consumption of computational calculations [23]. An additional delicate question consists of accurately representing the solid-fluid interface phenomena [11,15].…”

“…An additional delicate question consists of accurately representing the solid-fluid interface phenomena [11,15]. Nevertheless, advanced mathematical models-including surface diffusion of the adsorbed phase, Knudsen diffusion of the gaseous phase, thermal diffusion and sorption as local processes in the porous desiccant layer-have been adopted to support numerical simulations of the behaviour of desiccant and enthalpy wheels [53][54][55][56]. Some of the adopted assumptions [56] were: (i) the channel wall was made of a composite material, which is assumed to be an uniform mixture of substratum and desiccant materials; (ii) the mass fraction of desiccant in the porous medium was taken as thrice the mass fraction of substratum; (iii) the adsorption heat and the volume fraction of the gaseous phase inside the porous medium were both constant and uniform.…”