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to determine the performance capabilities of an indirect cooling and heating method. They concluded that the optimal conditions for adsorption were a 50 minute half- cycle and that desorption should be halted after the preheating step with no use of a purge gas. In their work they recognized that the specific heat consumption was slightly higher than that put forth by Bounaceur et al.9 However, their process configuration (i.e., their choice of adsorbent, number of beds, step duration, etc.) was not optimized. Since there are numerous approaches of supplying energy to the TSA bed during desorption, it is necessary to determine how temperature variations in the bed impact future adsorption cycles. The scope of this paper is to determine the impact that nonuniform heating has on the performance of the desorption half-cycle in temperature swing compres- sion. We model consecutive desorption and adsorption half cycles of CO2 for a bed consisting of 5A zeolite for varying degrees of nonuniform heating using material and energy balances developed by Sward et al.7 and Walton and LeVan.10 During the desorption half-cycles modeled, the total energy supplied by heaters to the bed re- mains constant, but the fraction of the total energy that each heater individually supplies is altered in order to study the mass of desorption from the bed per unit energy supplied, i.e., the regeneration efficiency, η. We believe this is the first study performed which considers the impact of nonuniform heating on desorption for a TSA bed. 3.2 Mathematical Model Sward et al.7 developed a mathematical model for mass and energy transport to describe the basic principles of the TSA cycle that we use in our simulations by applying the following assumptions to the generalized mass and energy transport equations outlined in Bird et al.11 The gas phase can be described by the ideal gas law. N2 and O2 are inert and can be modeled as a single component, i.e., air. Heat 28PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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