چكيده به لاتين
Poor heat and mass transfer inside the adsorbent bed of adsorption cooling systems cause low system performance and is an important problem in the adsorbent bed design. In this thesis, with considering an adsorbent bed, methods to increasing heat and mass transfer in the adsorbent bed are discussed. A 2-D mathematical model of heat and mass transfer inside a cylindrical adsorption bed is developed, with a heat transfer fliud flowing through an inner tube and the adsorbent bed in the annulus. A comparison between the finless and finned tube adsorbent beds is made in terms of heat transfer inside the bed. The adsorbent bed is constructed from a finned tube in order to enhance the heat transfer. Additionally, the finned bed geometry is theoretically modeled and the model is solved time dependently by using Comsol Multiphysics software program. The distributions of dependent variables, i.e. temperature, pressure and amount adsorbed, are simulated and plotted in Comsol Multiphysics. In the model, the dependent variables are computed by solving the energy, mass and momentum transfer equations in a coupled way and their variations are investigated three-dimensionally. The results are presented with multicolored plots in a 3- D domain. a parametric study is carried out for determining factors that enhance the heat and mass transfer inside the adsorbent bed. In this parametric study, the effects of several design and operational parameters on the dependent variables are investigated. the finned tube is tested using activated carbon (208c)-ethanol, activated carbon (208c)-ammonia and activated carbon (208c)-mthanol working pairs. Temperature, pressure and amount adsorbed variations inside the adsorbent bed at various operating conditions are investigated.
