Numerical investigation of coupled heat and mass transfer inside the adsorbent bed of an adsorption cooling unit

Solmus, Ismail
Rees, D. Andrew S.
Yamali, Cemil
Baker, Derek Keıth
In this study, the influence of several design parameters on the transient distributions of temperature, pressure and amount adsorbed in the radial direction of a cylindrical adsorbent bed of an adsorption cooling unit using silica gel/water have been investigated numerically. For this purpose, a transient one-dimensional local thermal non-equilibrium model that accounts for both internal and external mass transfer resistances has been developed using the local volume averaging method. For the conditions investigated, the validity of the local thermal equilibrium and spatially isobaric bed assumptions have been confirmed. To improve the performance of the bed considered, efforts should be focused on reducing heat transfer resistances and intra-particle (interior) mass transfer resistances but not inter-particle (exterior) mass transfer resistances. (C) 2011 Elsevier Ltd and IIR. All rights reserved.


A two-energy equation model for dynamic heat and mass transfer in an adsorbent bed using silica gel/water pair
Solmus, Ismail; Rees, D. Andrew S.; Yamali, Cemil; Baker, Derek Keıth (2012-09-01)
In this study, the influence of the adsorbent bed dimensions, convective heat transfer coefficient between the cooling fluid and adsorbent bed and the thermal conductivity of the solid adsorbent material on the transient distributions of the solid and gas phase temperature difference, differences in the adsorbate concentration predicted by the instantaneous equilibrium and linear driving force (LDF) models, solid phase temperature, gas pressure and adsorbate concentration inside the adsorbent bed of a solid...
Transient behavior of a cylindrical adsorbent bed during the adsorption process
SOLMUŞ, İsmail; Yamali, Cemil; Yıldırım, Cihan; BİLEN, Kadir (2015-03-15)
A transient two dimensional local thermal non-equilibrium model is developed to investigate the influences of heat transfer and operating parameters on the dynamic behavior of a cylindrical adsorbent bed during the adsorption process. Local volume averaging method is used to drive the macro scale governing conservation equations from the micro scale ones. In the model, linear driving force model and Darcy's equation are considered to account for the resistances to internal and external mass transfer, respec...
Parametric Study and Seasonal Simulations of a Solar Powered Adsorption Cooling System
Taylan, Onur; Baker, Derek Keıth; Kaftanoglu, Bilgin (2009-09-03)
Models of solar-thermal powered adsorption cooling systems with and without heat recovery developed in TRNSYS and results from steady-periodic and seasonal simulations are presented. A normalized model is presented and used to process the seasonal TRNSYS results to investigate the coincidence between the solar-supplied cooling power and cooling load as the relative sizes of the cooling system and storage are varied. The normalized model yields a seasonal solar fraction and seasonal loss fraction (the excess...
Adsorption of water and ammonia on TiO2-anatase cluster models
Önal, Işık; Senkan, Selim (2006-06-15)
Density functional theory (DFT) calculations performed at B3LYP/6-31G** level are employed to study water and ammonia adsorption and dissociation on (101) and (001) TiO2 anatase surfaces both represented by totally fixed and partially relaxed Ti2O9H10 cluster models. PM3 semiempirical calculations were also conducted both on Ti2O9H10 and Ti9O33H30 clusters in order to assess the effect of cluster size. Following dissociation, the adsorption of H2O and NH3 by H-bonding on previously H2O and NH3 dissociated s...
Calculation of the Thermodynamic Quantities for Cubic Gauche Nitrogen (cg-N)
Yurtseven, Hasan Hamit; Akay, O. (2022-01-01)
This work aims to investigate the thermodynamic properties of the cubic gauge nitrogen (cg-N) by calculating the relevant thermodynamic quantities as a functions of temperature and pressure. The thermodynamic quantities of volume (V), thermal expansion (alpha p), isothermal compressibility (kappa T), bulk modulus(B), and the heat capacity (Cp) are calculated as a function of temperature at constants pressures (0, 35, 125, 250 GPa) for the cg-N structure. Also, the pressure dependences of V, kappa T, alpha p...
Citation Formats
I. Solmus, D. A. S. Rees, C. Yamali, D. K. Baker, and B. KAFTANOĞLU, “Numerical investigation of coupled heat and mass transfer inside the adsorbent bed of an adsorption cooling unit,” INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, pp. 652–662, 2012, Accessed: 00, 2020. [Online]. Available: