A Quasi Steady State Model for Adsorption Cooling Systems: Automotive Applications

Abstract

In this study, an analytical quasi-steady state thermodynamic cycle of an adsorption cooling system (ACS) for automotive applications is presented which allows evaluating impact of different parameters on the ACS performance as well as effects of various working pairs: zeolite 13X/water, zeolite 4A/water and activated carbon-35/methanol. A comprehensive parametric study has been performed to investigate effects of temperature variation of the evaporator and condenser as well as the ICE exhaust gas temperature on the COP, cooling load produced by the evaporator and entropy generation of ACS with (or without) the heat recovery cycle (HRC). The results show that using the heat recovery cycle in the ACS can increase the COP of system up to 41% for zeolite 13X/water pair at the base-line condition. In addition, the parametric study shows that increasing regeneration and evaporation temperature increase the COP and entropy generation of ACS while increasing condensation temperature has negative effect on the COP and entropy generation. Finally, based on our modeling results, the ACS with the heat recovery cycle (HRC) and zeolite 13X/water pair are proposed for the automotive A/C applications.

Performance Evaluation of Phenol-Resin-Based Adsorbents for Heat Transformation Applications

“…It is noteworthy that, within the scope of this research, the kinetics pertaining to PR derivative/refrigerant pairs have deliberately been excluded from consideration. Thermodynamic processes involved in the AHP cycle are provided by Equations ( 5)-( 8) [43,47].…”

“…Again, the heat is released during the isosteric cooling process (Q 1-4 ) estimated by Equation ( 8) that is the summation of the two sensible heats for lowering the temperature of PR derivative as well as the refrigerant vapors that still adsorb on the surface. The key performance indicators for both adsorption cooling and adsorption heating are estimated using Equations ( 9)-( 13) as provided by [43,47]:…”

“…The thermophysical properties and fitting constants of the adsorption isotherm model for the selected PR derivative/refrigerant pairs are available via [40][41][42] and utilized accordingly in the present research. A steady-state thermodynamic modeling scheme is utilized comprising the Dubinin-Astakhov model, and the system's governing heat and mass balance equations are widely accessible and often employed in the literature [43,44]. The key performance indicators of the AHP system, including specific cooling energy (SCE), specific heating energy (SHE), and COP, are evaluated at steady-state conditions.…”

Entropy Analysis of Temperature Swing Adsorption for CO2 Capture Using the Computational Fluid Dynamics (CFD) Method

“…Entropy 2019, 21, x FOR PEER REVIEW 3 of 25 theory of non-equilibrium thermodynamics, entropy generation can be expressed as the product of thermodynamic flow and thermodynamic force in the non-equilibrium process. Compared with the Clausius calculation method of entropy [20,[28][29][30][31], this calculation method could provide a clearer explanation on the irreversible factors in thermodynamic processes. In this paper, the CFD method is applied to comprehensively calculate and analysis the entropy generation in the three-step temperature swing adsorption cycle.…”