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where = 0.85 (compressor/blower efficiency), is the polytropic parameter ( =1.28 and 1.40 for pure CO2 and air, respectively), is the temperature, is the pressure at adsorption conditions and is the pressure at desorption conditions. is the total number of moles where the work is effectuated, and varies from one process to the other. It should be noted that, depending on whether PSA or VSA processes are considered, the amount of pressurized or expanded substance differs. In VSA, the complete bed is subjected to a vacuum. Conversely, for PSA, the amount compressed will be higher and mainly depends on the working capacity of CO2 at the feeding stream conditions, since purge/rinse has not been taken into account in this study. Hence, is calculated as follows for PSA and VSA processes: (5) A value for void fraction of = 0.4 (i.e., = (bulk density)/(framework density)) was used and a bed volume of 1 m3. When comparing among different materials, both the total volume of the column and the fractional voidage were held constant. Therefore, the total mass of the adsorbents used is governed by the framework density of the adsorbent materials, . The thermal regeneration energy, , is the energy required for heating and desorption in TSA processes. This total thermal regeneration energy involves two main contributions: (i) the energy required to heat the adsorbent material, and (ii) the energy required to overcome the endothermic desorption process. This energy can be calculated as:85,86 16PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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